iter_finish_branch_entry() doesn't put the branch_info from/to map
elements creating memory leaks. This can be seen with:

```
$ perf record -e cycles -b perf test -w noploop
$ perf report -D
...
Direct leak of 984344 byte(s) in 123043 object(s) allocated from:
    #0 0x7fb2654f3bd7 in malloc libsanitizer/asan/asan_malloc_linux.cpp:69
    #1 0x564d3400d10b in map__get util/map.h:186
    #2 0x564d3400d10b in ip__resolve_ams util/machine.c:1981
    #3 0x564d34014d81 in sample__resolve_bstack util/machine.c:2151
    #4 0x564d34094790 in iter_prepare_branch_entry util/hist.c:898
    #5 0x564d34098fa4 in hist_entry_iter__add util/hist.c:1238
    #6 0x564d33d1f0c7 in process_sample_event tools/perf/builtin-report.c:334
    #7 0x564d34031eb7 in perf_session__deliver_event util/session.c:1655
    #8 0x564d3403ba52 in do_flush util/ordered-events.c:245
    #9 0x564d3403ba52 in __ordered_events__flush util/ordered-events.c:324
    #10 0x564d3402d32e in perf_session__process_user_event util/session.c:1708
    #11 0x564d34032480 in perf_session__process_event util/session.c:1877
    #12 0x564d340336ad in reader__read_event util/session.c:2399
    #13 0x564d34033fdc in reader__process_events util/session.c:2448
    #14 0x564d34033fdc in __perf_session__process_events util/session.c:2495
    #15 0x564d34033fdc in perf_session__process_events util/session.c:2661
    #16 0x564d33d27113 in __cmd_report tools/perf/builtin-report.c:1065
    #17 0x564d33d27113 in cmd_report tools/perf/builtin-report.c:1805
    #18 0x564d33e0ccb7 in run_builtin tools/perf/perf.c:350
    #19 0x564d33e0d45e in handle_internal_command tools/perf/perf.c:403
    #20 0x564d33cdd827 in run_argv tools/perf/perf.c:447
    #21 0x564d33cdd827 in main tools/perf/perf.c:561
...
```

Clearing up the map_symbols properly creates maps reference count
issues so resolve those. Resolving this issue doesn't improve peak
heap consumption for the test above.

Committer testing:

  $ sudo dnf install libasan
  $ make -k CORESIGHT=1 EXTRA_CFLAGS="-fsanitize=address" CC=clang O=/tmp/build/$(basename $PWD)/ -C tools/perf install-bin
Reviewed-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Ian Rogers <irogers@google.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Sun Haiyong <sunhaiyong@loongson.cn>
Cc: Yanteng Si <siyanteng@loongson.cn>
Link: https://lore.kernel.org/r/20240807065136.1039977-1-irogers@google.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

To pick a patch that albeit being for tools/perf/ directory went thru a
different tree and ended up breaking some recent tests introduced in the
perf-tools-next tree to validate duplicate events in the JSON
performance event files.

Link: https://lore.kernel.org/lkml/ZrIqDMg7cBVhstYU@x1Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

Merge tag 'platform-drivers-x86-v6.11-2' of git://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86

Pull x86 platform driver fixes from Ilpo Järvinen:
 "Fixes:

   - Fix ACPI notifier racing with itself (intel-vbtn)

   - Initialize local variable to cover a timeout corner case
     (intel/ifs)

   - WMI docs spelling

  New device IDs:

   - amd/{pmc,pmf}: AMD 1Ah model 60h series.

   - amd/pmf: SPS quirk support for ASUS ROG Ally X"

* tag 'platform-drivers-x86-v6.11-2' of git://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86:
  platform/x86/intel/ifs: Initialize union ifs_status to zero
  platform/x86: msi-wmi-platform: Fix spelling mistakes
  platform/x86/amd/pmf: Add new ACPI ID AMDI0107
  platform/x86/amd/pmc: Send OS_HINT command for new AMD platform
  platform/x86/amd: pmf: Add quirk for ROG Ally X
  platform/x86: intel-vbtn: Protect ACPI notify handler against recursion

Duplicate event names break invariants in 'perf list'. Assert that an
event name isn't duplicated so that broken JSON won't build.
Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Albert Ou <aou@eecs.berkeley.edu>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Atish Patra <atishp@rivosinc.com>
Cc: Changbin Du <changbin.du@huawei.com>
Cc: Charles Ci-Jyun Wu <dminus@andestech.com>
Cc: Eric Lin <eric.lin@sifive.com>
Cc: Greentime Hu <greentime.hu@sifive.com>
Cc: Guilherme Amadio <amadio@gentoo.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Inochi Amaoto <inochiama@outlook.com>
Cc: James Clark <james.clark@linaro.org>
Cc: Ji Sheng Teoh <jisheng.teoh@starfivetech.com>
Cc: Jing Zhang <renyu.zj@linux.alibaba.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: John Garry <john.g.garry@oracle.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Leo Yan <leo.yan@linux.dev>
Cc: Locus Wei-Han Chen <locus84@andestech.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Paul Walmsley <paul.walmsley@sifive.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Samuel Holland <samuel.holland@sifive.com>
Cc: Sandipan Das <sandipan.das@amd.com>
Cc: Vincent Chen <vincent.chen@sifive.com>
Cc: Will Deacon <will@kernel.org>
Cc: Xu Yang <xu.yang_2@nxp.com>
Link: https://lore.kernel.org/r/20240805194424.597244-5-irogers@google.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

OP_SPEC is repeated twice in the file which will break invariants in
'perf list' as discussed in this thread:

  https://lore.kernel.org/linux-perf-users/20240719081651.24853-1-eric.lin@sifive.com/Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Albert Ou <aou@eecs.berkeley.edu>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Atish Patra <atishp@rivosinc.com>
Cc: Changbin Du <changbin.du@huawei.com>
Cc: Charles Ci-Jyun Wu <dminus@andestech.com>
Cc: Eric Lin <eric.lin@sifive.com>
Cc: Greentime Hu <greentime.hu@sifive.com>
Cc: Guilherme Amadio <amadio@gentoo.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Inochi Amaoto <inochiama@outlook.com>
Cc: James Clark <james.clark@linaro.org>
Cc: Ji Sheng Teoh <jisheng.teoh@starfivetech.com>
Cc: Jing Zhang <renyu.zj@linux.alibaba.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: John Garry <john.g.garry@oracle.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Leo Yan <leo.yan@linux.dev>
Cc: Locus Wei-Han Chen <locus84@andestech.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Paul Walmsley <paul.walmsley@sifive.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Samuel Holland <samuel.holland@sifive.com>
Cc: Sandipan Das <sandipan.das@amd.com>
Cc: Vincent Chen <vincent.chen@sifive.com>
Cc: Will Deacon <will@kernel.org>
Cc: Xu Yang <xu.yang_2@nxp.com>
Link: https://lore.kernel.org/r/20240805194424.597244-3-irogers@google.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

Switch from $? (all the prerequisites that are newer than the target)
to $^ (all the prerequisites) as touching jevents.py will mean that
empty-pmu-events.c won't be passed to the diff command breaking the
build.
Reported-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Ian Rogers <irogers@google.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Albert Ou <aou@eecs.berkeley.edu>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Atish Patra <atishp@rivosinc.com>
Cc: Changbin Du <changbin.du@huawei.com>
Cc: Charles Ci-Jyun Wu <dminus@andestech.com>
Cc: Eric Lin <eric.lin@sifive.com>
Cc: Greentime Hu <greentime.hu@sifive.com>
Cc: Guilherme Amadio <amadio@gentoo.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Inochi Amaoto <inochiama@outlook.com>
Cc: James Clark <james.clark@linaro.org>
Cc: Ji Sheng Teoh <jisheng.teoh@starfivetech.com>
Cc: Jing Zhang <renyu.zj@linux.alibaba.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: John Garry <john.g.garry@oracle.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Leo Yan <leo.yan@linux.dev>
Cc: Locus Wei-Han Chen <locus84@andestech.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Paul Walmsley <paul.walmsley@sifive.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Samuel Holland <samuel.holland@sifive.com>
Cc: Sandipan Das <sandipan.das@amd.com>
Cc: Vincent Chen <vincent.chen@sifive.com>
Cc: Will Deacon <will@kernel.org>
Cc: Xu Yang <xu.yang_2@nxp.com>
Link: https://lore.kernel.org/r/20240805194424.597244-2-irogers@google.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

Building with JEVENTS_ARCH=all builds all CPU types and allows things
like assertions to check the validity of the input JSON.
Signed-off-by: Ian Rogers <irogers@google.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Albert Ou <aou@eecs.berkeley.edu>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Atish Patra <atishp@rivosinc.com>
Cc: Changbin Du <changbin.du@huawei.com>
Cc: Charles Ci-Jyun Wu <dminus@andestech.com>
Cc: Eric Lin <eric.lin@sifive.com>
Cc: Greentime Hu <greentime.hu@sifive.com>
Cc: Guilherme Amadio <amadio@gentoo.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Inochi Amaoto <inochiama@outlook.com>
Cc: James Clark <james.clark@linaro.org>
Cc: Ji Sheng Teoh <jisheng.teoh@starfivetech.com>
Cc: Jing Zhang <renyu.zj@linux.alibaba.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: John Garry <john.g.garry@oracle.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Leo Yan <leo.yan@linux.dev>
Cc: Locus Wei-Han Chen <locus84@andestech.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Paul Walmsley <paul.walmsley@sifive.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Samuel Holland <samuel.holland@sifive.com>
Cc: Sandipan Das <sandipan.das@amd.com>
Cc: Vincent Chen <vincent.chen@sifive.com>
Cc: Will Deacon <will@kernel.org>
Cc: Xu Yang <xu.yang_2@nxp.com>
Link: https://lore.kernel.org/r/20240805194424.597244-1-irogers@google.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

Merge tag 'linux_kselftest-fixes-6.11-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest

Pull kselftest fix from Shuah Khan:
 "A single fix to the conditional in ksft.py script which incorrectly
  flags a test suite failed when there are skipped tests in the mix.

  The logic is fixed to take skipped tests into account and report the
  test as passed"

* tag 'linux_kselftest-fixes-6.11-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest:
  selftests: ksft: Fix finished() helper exit code on skipped tests

Like in 'perf report', we want to hide empty events in the 'perf annotate'
output.  This is consistent when the option is set in perf report.

For example, the following command would use 3 events including dummy.

  $ perf mem record -a -- perf test -w noploop

  $ perf evlist
  cpu/mem-loads,ldlat=30/P
  cpu/mem-stores/P
  dummy:u

Just using perf annotate with --group will show the all 3 events.

  $ perf annotate --group --stdio | head
   Percent                 |	Source code & Disassembly of ...
  --------------------------------------------------------------
                           : 0     0xe060 <_dl_relocate_object>:
      0.00    0.00    0.00 :    e060:       pushq   %rbp
      0.00    0.00    0.00 :    e061:       movq    %rsp, %rbp
      0.00    0.00    0.00 :    e064:       pushq   %r15
      0.00    0.00    0.00 :    e066:       movq    %rdi, %r15
      0.00    0.00    0.00 :    e069:       pushq   %r14
      0.00    0.00    0.00 :    e06b:       pushq   %r13
      0.00    0.00    0.00 :    e06d:       movl    %edx, %r13d

Now with --skip-empty, it'll hide the last dummy event.

  $ perf annotate --group --stdio --skip-empty | head
   Percent         |	Source code & Disassembly of ...
  ------------------------------------------------------
                   : 0     0xe060 <_dl_relocate_object>:
      0.00    0.00 :    e060:       pushq   %rbp
      0.00    0.00 :    e061:       movq    %rsp, %rbp
      0.00    0.00 :    e064:       pushq   %r15
      0.00    0.00 :    e066:       movq    %rdi, %r15
      0.00    0.00 :    e069:       pushq   %r14
      0.00    0.00 :    e06b:       pushq   %r13
      0.00    0.00 :    e06d:       movl    %edx, %r13d

Committer testing:

  root@x1:~# perf evlist
  cpu_atom/mem-loads,ldlat=30/P
  cpu_atom/mem-stores/P
  dummy:u
  root@x1:~#

Before:

  root@x1:~# perf annotate --group --stdio2 do_lookup_x | head -25
  Samples: 20  of events 'cpu_atom/mem-loads,ldlat=30/P, cpu_atom/mem-stores/P, dummy:u', 4000 Hz, Event count (approx.): 769079, [percent: local period]
  do_lookup_x() /usr/lib64/ld-linux-x86-64.so.2
  Percent                       0x9900 <do_lookup_x>:
                                  pushq      %rbp
                                  movq       %rsp,%rbp
                                  pushq      %r15
                                  pushq      %r14
                                  pushq      %r13
                                  pushq      %r12
                                  pushq      %rbx
                                  subq       $0x88,%rsp
                                  movq       %rdi,-0x50(%rbp)
                                  movl       8(%r9),%edi
                                  movq       0x10(%rbp),%r12
                                  movq       0x28(%rbp),%r10
                                  movq       %rdx,-0x70(%rbp)
                                  movq       %rcx,-0x58(%rbp)
                                  movq       %rdi,%r11
     0.00    5.73    0.00         movq       %r8,-0x68(%rbp)
                                  movq       (%r9),%r8
                                  movl       %esi,%eax
     8.30    0.00    0.00         movl       0x30(%rbp),%r9d
                                  movl       %esi,%r15d
                                  shrl       $6, %eax
                                  movq       %r8,%r13
  root@x1:~#

After:

  root@x1:~# perf annotate --group --skip-empty --stdio2 do_lookup_x | head -25
  Samples: 20  of events 'cpu_atom/mem-loads,ldlat=30/P, cpu_atom/mem-stores/P', 4000 Hz, Event count (approx.): 769079, [percent: local period]
  do_lookup_x() /usr/lib64/ld-linux-x86-64.so.2
  Percent               0x9900 <do_lookup_x>:
                          pushq      %rbp
                          movq       %rsp,%rbp
                          pushq      %r15
                          pushq      %r14
                          pushq      %r13
                          pushq      %r12
                          pushq      %rbx
                          subq       $0x88,%rsp
                          movq       %rdi,-0x50(%rbp)
                          movl       8(%r9),%edi
                          movq       0x10(%rbp),%r12
                          movq       0x28(%rbp),%r10
                          movq       %rdx,-0x70(%rbp)
                          movq       %rcx,-0x58(%rbp)
                          movq       %rdi,%r11
     0.00    5.73         movq       %r8,-0x68(%rbp)
                          movq       (%r9),%r8
                          movl       %esi,%eax
     8.30    0.00         movl       0x30(%rbp),%r9d
                          movl       %esi,%r15d
                          shrl       $6, %eax
                          movq       %r8,%r13
  root@x1:~#
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20240803211332.1107222-6-namhyung@kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

This is a preparation to support skipping empty events.
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20240803211332.1107222-5-namhyung@kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

The annotation__pcnt_width() calculates the screen width for the
overhead (percent) area considering event groups properly.  Use this
function consistently so that we can make sure it has similar output
in different modes.  But there's a difference in stdio and tui output:
stdio uses 8 and tui uses 7 for a percent.

Let's use 8 and adjust the print width in __annotation_line__write()
properly.
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20240803211332.1107222-4-namhyung@kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

We want to use it in different places so make sure it sets properly
in symbol__annotate() before creating the disasm lines.
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20240803211332.1107222-3-namhyung@kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

The data_nr keeps the number of entries in al->data[] so it should use
it when it iterates the array.  The notes->src->nr_events should have
the same number but it'd be natural to use al->data_nr.
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20240803211332.1107222-2-namhyung@kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

Pull slab fix from Vlastimil Babka:
 "Since v6.8 we've had a subtle breakage in SLUB with KFENCE enabled,
  that can cause a crash. It hasn't been found earlier due to quite
  specific conditions necessary (OOM during kmem_cache_alloc_bulk())"

* tag 'slab-fixes-for-6.11-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/vbabka/slab:
  mm, slub: do not call do_slab_free for kfence object

The dependencies in tools/lib/bpf/Makefile are incorrect. Before we
recurse to build $(BPF_IN_STATIC), we need to build its 'fixdep'
executable.

I can't use the usual shortcut from Makefile.include:

  <target>: <sources> fixdep

because its 'fixdep' target relies on $(OUTPUT), and $(OUTPUT) differs
in the parent 'make' versus the child 'make' -- so I imitate it via
open-coding.

I tweak a few $(MAKE) invocations while I'm at it, because
1. I'm adding a new recursive make; and
2. these recursive 'make's print spurious lines about files that are "up
   to date" (which isn't normally a feature in Kbuild subtargets) or
   "jobserver not available" (see [1])

I also need to tweak the assignment of the OUTPUT variable, so that
relative path builds work. For example, for 'make tools/lib/bpf', OUTPUT
is unset, and is usually treated as "cwd" -- but recursive make will
change cwd and so OUTPUT has a new meaning. For consistency, I ensure
OUTPUT is always an absolute path.

And $(Q) gets a backup definition in tools/build/Makefile.include,
because Makefile.include is sometimes included without
tools/build/Makefile, so the "quiet command" stuff doesn't actually work
consistently without it.

After this change, top-level builds result in an empty grep result from:

  $ grep 'cannot find fixdep' $(find tools/ -name '*.cmd')

[1] https://www.gnu.org/software/make/manual/html_node/MAKE-Variable.html
If we're not using $(MAKE) directly, then we need to use more '+'.
Signed-off-by: Brian Norris <briannorris@chromium.org>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Ian Rogers <irogers@google.com>
Cc: Josh Poimboeuf <jpoimboe@kernel.org>
Cc: Masahiro Yamada <masahiroy@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Richter <tmricht@linux.ibm.com>
Link: https://lore.kernel.org/r/20240715203325.3832977-4-briannorris@chromium.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

The 'fixdep' tool is used to post-process dependency files for various
reasons, and it runs after every object file generation command. This
even includes 'fixdep' itself.

In Kbuild, this isn't actually a problem, because it uses a single
command to generate fixdep (a compile-and-link command on fixdep.c), and
afterward runs the fixdep command on the accompanying .fixdep.cmd file.

In tools/ builds (which notably is maintained separately from Kbuild),
fixdep is generated in several phases:

 1. fixdep.c -> fixdep-in.o
 2. fixdep-in.o -> fixdep

Thus, fixdep is not available in the post-processing for step 1, and
instead, we generate .cmd files that look like:

  ## from tools/objtool/libsubcmd/.fixdep.o.cmd
  # cannot find fixdep (/path/to/linux/tools/objtool/libsubcmd//fixdep)
  [...]

These invalid .cmd files are benign in some respects, but cause problems
in others (such as the linked reports).

Because the tools/ build system is rather complicated in its own right
(and pointedly different than Kbuild), I choose to simply open-code the
rule for building fixdep, and avoid the recursive-make indirection that
produces the problem in the first place.
Signed-off-by: Brian Norris <briannorris@chromium.org>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Ian Rogers <irogers@google.com>
Cc: Josh Poimboeuf <jpoimboe@kernel.org>
Cc: Masahiro Yamada <masahiroy@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Richter <tmricht@linux.ibm.com>
Link: https://lore.kernel.org/all/Zk-C5Eg84yt6_nml@google.com/
Link: https://lore.kernel.org/r/20240715203325.3832977-3-briannorris@chromium.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

All built targets need fixdep to be built first, before handling object
dependencies [1]. We're missing one such dependency before the libsubcmd
target.

This resolves .cmd file generation issues such that the following
sequence produces many fewer results:

  $ git clean -xfd tools/
  $ make tools/objtool
  $ grep "cannot find fixdep" $(find tools/objtool -name '*.cmd')

In particular, only a buggy tools/objtool/libsubcmd/.fixdep.o.cmd
remains, due to circular dependencies of fixdep on itself.

Such incomplete .cmd files don't usually cause a direct problem, since
they're designed to fail "open", but they can cause some subtle problems
that would otherwise be handled by proper fixdep'd dependency files. [2]

[1] This problem is better described in commit abb26210 ("perf
tools: Force fixdep compilation at the start of the build"). I don't
apply its solution here, because additional recursive make can be a bit
of overkill.

[2] Example failure case:

  cp -arl linux-src linux-src2
  cd linux-src2
  make O=/path/to/out
  cd ../linux-src
  rm -rf ../linux-src2
  make O=/path/to/out

Previously, we'd see errors like:

  make[6]: *** No rule to make target
  '/path/to/linux-src2/tools/include/linux/compiler.h', needed by
  '/path/to/out/tools/bpf/resolve_btfids/libsubcmd/exec-cmd.o'.  Stop.

Now, the properly-fixdep'd .cmd files will ignore a missing
/path/to/linux-src2/...
Signed-off-by: Brian Norris <briannorris@chromium.org>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Ian Rogers <irogers@google.com>
Cc: Josh Poimboeuf <jpoimboe@kernel.org>
Cc: Masahiro Yamada <masahiroy@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Richter <tmricht@linux.ibm.com>
Link: https://lore.kernel.org/all/ZGVi9HbI43R5trN8@bhelgaas/
Link: https://lore.kernel.org/all/Zk-C5Eg84yt6_nml@google.com/
Link: https://lore.kernel.org/r/20240715203325.3832977-2-briannorris@chromium.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

Add a common options section and move some items to the section.  Also
add description of new options to report options.
Suggested-by: Ian Rogers <irogers@google.com>
Reviewed-by: Ian Rogers <irogers@google.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: https://lore.kernel.org/lkml/20240802180913.1023886-1-namhyung@kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

The kernel sleep profile is no longer working due to a recursive locking
bug introduced by commit 42a20f86 ("sched: Add wrapper for get_wchan()
to keep task blocked")

Booting with the 'profile=sleep' kernel command line option added or
executing

  # echo -n sleep > /sys/kernel/profiling

after boot causes the system to lock up.

Lockdep reports

  kthreadd/3 is trying to acquire lock:
  ffff93ac82e08d58 (&p->pi_lock){....}-{2:2}, at: get_wchan+0x32/0x70

  but task is already holding lock:
  ffff93ac82e08d58 (&p->pi_lock){....}-{2:2}, at: try_to_wake_up+0x53/0x370

with the call trace being

   lock_acquire+0xc8/0x2f0
   get_wchan+0x32/0x70
   __update_stats_enqueue_sleeper+0x151/0x430
   enqueue_entity+0x4b0/0x520
   enqueue_task_fair+0x92/0x6b0
   ttwu_do_activate+0x73/0x140
   try_to_wake_up+0x213/0x370
   swake_up_locked+0x20/0x50
   complete+0x2f/0x40
   kthread+0xfb/0x180

However, since nobody noticed this regression for more than two years,
let's remove 'profile=sleep' support based on the assumption that nobody
needs this functionality.

Fixes: 42a20f86 ("sched: Add wrapper for get_wchan() to keep task blocked")
Cc: stable@vger.kernel.org # v5.16+
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Pull x86 fixes from Thomas Gleixner:

 - Prevent a deadlock on cpu_hotplug_lock in the aperf/mperf driver.

   A recent change in the ACPI code which consolidated code pathes moved
   the invocation of init_freq_invariance_cppc() to be moved to a CPU
   hotplug handler. The first invocation on AMD CPUs ends up enabling a
   static branch which dead locks because the static branch enable tries
   to acquire cpu_hotplug_lock but that lock is already held write by
   the hotplug machinery.

   Use static_branch_enable_cpuslocked() instead and take the hotplug
   lock read for the Intel code path which is invoked from the
   architecture code outside of the CPU hotplug operations.

 - Fix the number of reserved bits in the sev_config structure bit field
   so that the bitfield does not exceed 64 bit.

 - Add missing Zen5 model numbers

 - Fix the alignment assumptions of pti_clone_pgtable() and
   clone_entry_text() on 32-bit:

   The code assumes PMD aligned code sections, but on 32-bit the kernel
   entry text is not PMD aligned. So depending on the code size and
   location, which is configuration and compiler dependent, entry text
   can cross a PMD boundary. As the start is not PMD aligned adding PMD
   size to the start address is larger than the end address which
   results in partially mapped entry code for user space. That causes
   endless recursion on the first entry from userspace (usually #PF).

   Cure this by aligning the start address in the addition so it ends up
   at the next PMD start address.

   clone_entry_text() enforces PMD mapping, but on 32-bit the tail might
   eventually be PTE mapped, which causes a map fail because the PMD for
   the tail is not a large page mapping. Use PTI_LEVEL_KERNEL_IMAGE for
   the clone() invocation which resolves to PTE on 32-bit and PMD on
   64-bit.

 - Zero the 8-byte case for get_user() on range check failure on 32-bit

   The recend consolidation of the 8-byte get_user() case broke the
   zeroing in the failure case again. Establish it by clearing ECX
   before the range check and not afterwards as that obvioulsy can't be
   reached when the range check fails

* tag 'x86-urgent-2024-08-04' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/uaccess: Zero the 8-byte get_range case on failure on 32-bit
  x86/mm: Fix pti_clone_entry_text() for i386
  x86/mm: Fix pti_clone_pgtable() alignment assumption
  x86/setup: Parse the builtin command line before merging
  x86/CPU/AMD: Add models 0x60-0x6f to the Zen5 range
  x86/sev: Fix __reserved field in sev_config
  x86/aperfmperf: Fix deadlock on cpu_hotplug_lock

Pull timer fixes from Thomas Gleixner:
 "Two fixes for the timer/clocksource code:

   - The recent fix to make the take over of the broadcast timer more
     reliable retrieves a per CPU pointer in preemptible context.

     This went unnoticed in testing as some compilers hoist the access
     into the non-preemotible section where the pointer is actually
     used, but obviously compilers can rightfully invoke it where the
     code put it.

     Move it into the non-preemptible section right to the actual usage
     side to cure it.

   - The clocksource watchdog is supposed to emit a warning when the
     retry count is greater than one and the number of retries reaches
     the limit.

     The condition is backwards and warns always when the count is
     greater than one. Fixup the condition to prevent spamming dmesg"

* tag 'timers-urgent-2024-08-04' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  clocksource: Fix brown-bag boolean thinko in cs_watchdog_read()
  tick/broadcast: Move per CPU pointer access into the atomic section

Pull scheduler fixes from Thomas Gleixner:

 - When stime is larger than rtime due to accounting imprecision, then
   utime = rtime - stime becomes negative. As this is unsigned math, the
   result becomes a huge positive number.

   Cure it by resetting stime to rtime in that case, so utime becomes 0.

 - Restore consistent state when sched_cpu_deactivate() fails.

   When offlining a CPU fails in sched_cpu_deactivate() after the SMT
   present counter has been decremented, then the function aborts but
   fails to increment the SMT present counter and leaves it imbalanced.
   Consecutive operations cause it to underflow. Add the missing fixup
   for the error path.

   For SMT accounting the runqueue needs to marked online again in the
   error exit path to restore consistent state.

* tag 'sched-urgent-2024-08-04' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  sched/core: Fix unbalance set_rq_online/offline() in sched_cpu_deactivate()
  sched/core: Introduce sched_set_rq_on/offline() helper
  sched/smt: Fix unbalance sched_smt_present dec/inc
  sched/smt: Introduce sched_smt_present_inc/dec() helper
  sched/cputime: Fix mul_u64_u64_div_u64() precision for cputime

Pull x86 perf fixes from Thomas Gleixner:

 - Move the smp_processor_id() invocation back into the non-preemtible
   region, so that the result is valid to use

 - Add the missing package C2 residency counters for Sierra Forest CPUs
   to make the newly added support actually useful

* tag 'perf-urgent-2024-08-04' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  perf/x86: Fix smp_processor_id()-in-preemptible warnings
  perf/x86/intel/cstate: Add pkg C2 residency counter for Sierra Forest

Pull irq fixes from Thomas Gleixner:
 "A couple of fixes for interrupt chip drivers:

   - Make sure to skip the clear register space in the MBIGEN driver
     when calculating the node register index. Otherwise the clear
     register is clobbered and the wrong node registers are accessed.

   - Fix a signed/unsigned confusion in the loongarch CPU driver which
     converts an error code to a huge "valid" interrupt number.

   - Convert the mesion GPIO interrupt controller lock to a raw spinlock
     so it works on RT.

   - Add a missing static to a internal function in the pic32 EVIC
     driver"

* tag 'irq-urgent-2024-08-04' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  irqchip/mbigen: Fix mbigen node address layout
  irqchip/meson-gpio: Convert meson_gpio_irq_controller::lock to 'raw_spinlock_t'
  irqchip/irq-pic32-evic: Add missing 'static' to internal function
  irqchip/loongarch-cpu: Fix return value of lpic_gsi_to_irq()

Pull locking fixes from Thomas Gleixner:
 "Two fixes for locking and jump labels:

   - Ensure that the atomic_cmpxchg() conditions are correct and
     evaluating to true on any non-zero value except 1. The missing
     check of the return value leads to inconsisted state of the jump
     label counter.

   - Add a missing type conversion in the paravirt spinlock code which
     makes loongson build again"

* tag 'locking-urgent-2024-08-04' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  jump_label: Fix the fix, brown paper bags galore
  locking/pvqspinlock: Correct the type of "old" variable in pv_kick_node()

Commit 04f08ef2 ("arm/arm64: dts: arm: Use generic clock and
regulator nodenames") renamed nodes and created 2 "clock-24000000" nodes
(at different paths).

The kernel can't handle these duplicate names even though they are at
different paths.  Fix this by renaming one of the nodes to "clock-pclk".

This name is aligned with other Arm boards (those didn't have a known
frequency to use in the node name).

Fixes: 04f08ef2 ("arm/arm64: dts: arm: Use generic clock and regulator nodenames")
Reported-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Tested-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Pull smb client fixes from Steve French:

 - two reparse point fixes

 - minor cleanup

 - additional trace point (to help debug a recent problem)

* tag '6.11-rc1-smb-client-fixes' of git://git.samba.org/sfrench/cifs-2.6:
  cifs: update internal version number
  smb: client: fix FSCTL_GET_REPARSE_POINT against NetApp
  smb3: add dynamic tracepoints for shutdown ioctl
  cifs: Remove cifs_aio_ctx
  smb: client: handle lack of FSCTL_GET_REPARSE_POINT support

Pull media fixes from Mauro Carvalho Chehab:

 - two Kconfig fixes

 - one fix for the UVC driver addressing probing time detection of a UVC
   custom controls

 - one fix related to PDF generation

* tag 'media/v6.11-2' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media:
  media: v4l: Fix missing tabular column hint for Y14P format
  media: intel/ipu6: select AUXILIARY_BUS in Kconfig
  media: ipu-bridge: fix ipu6 Kconfig dependencies
  media: uvcvideo: Fix custom control mapping probing

Pull SCSI fixes from James Bottomley:
 "One core change that reverts the double message print patch in sd.c
  (it was causing regressions on embedded systems).

  The rest are driver fixes in ufs, mpt3sas and mpi3mr"

* tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi:
  scsi: ufs: exynos: Don't resume FMP when crypto support is disabled
  scsi: mpt3sas: Avoid IOMMU page faults on REPORT ZONES
  scsi: mpi3mr: Avoid IOMMU page faults on REPORT ZONES
  scsi: ufs: core: Do not set link to OFF state while waking up from hibernation
  scsi: Revert "scsi: sd: Do not repeat the starting disk message"
  scsi: ufs: core: Fix deadlock during RTC update
  scsi: ufs: core: Bypass quick recovery if force reset is needed
  scsi: ufs: core: Check LSDBS cap when !mcq

Pull xfs fixes from Chandan Babu:

 - Fix memory leak when corruption is detected during scrubbing parent
   pointers

 - Allow SECURE namespace xattrs to use reserved block pool to in order
   to prevent ENOSPC

 - Save stack space by passing tracepoint's char array to file_path()
   instead of another stack variable

 - Remove unused parameter in macro XFS_DQUOT_LOGRES

 - Replace comma with semicolon in a couple of places

* tag 'xfs-6.11-fixes-1' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux:
  xfs: convert comma to semicolon
  xfs: convert comma to semicolon
  xfs: remove unused parameter in macro XFS_DQUOT_LOGRES
  xfs: fix file_path handling in tracepoints
  xfs: allow SECURE namespace xattrs to use reserved block pool
  xfs: fix a memory leak

Merge tag 'parisc-for-6.11-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux

Pull parisc architecture fixes from Helge Deller:

 - fix unaligned memory accesses when calling BPF functions

 - adjust memory size constants to fix possible DMA corruptions

* tag 'parisc-for-6.11-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux:
  parisc: fix a possible DMA corruption
  parisc: fix unaligned accesses in BPF

The runtime constants linker script depended on documented linker
behavior [1]:

 "If an output section’s name is the same as the input section’s name
  and is representable as a C identifier, then the linker will
  automatically PROVIDE two symbols: __start_SECNAME and __stop_SECNAME,
  where SECNAME is the name of the section. These indicate the start
  address and end address of the output section respectively"

to just automatically define the symbol names for the bounds of the
runtime constant arrays.

It turns out that this isn't actually something we can rely on, with old
linkers not generating these automatic symbols.  It looks to have been
introduced in binutils-2.29 back in 2017, and we still support building
with versions all the way back to binutils-2.25 (from 2015).

And yes, Oleg actually seems to be using such ancient versions of
binutils.

So instead of depending on the implicit symbols from "section names
match and are representable C identifiers", just do this all manually.
It's not like it causes us any extra pain, we already have to do that
for all the other sections that we use that often have special
characters in them.
Reported-and-tested-by: Oleg Nesterov <oleg@redhat.com>
Link: https://sourceware.org/binutils/docs/ld/Input-Section-Example.html [1]
Link: https://lore.kernel.org/all/20240802114518.GA20924@redhat.com/Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Merge tag 'tags/fixes-media-uvc-20230722' of git://git.kernel.org/pub/scm/linux/kernel/git/pinchartl/linux.git

uvcvideo v6.11 regression fix: fix custom control mapping probing
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>

Pull io_uring fixes from Jens Axboe:
 "Two minor tweaks for the NAPI handling, both from Olivier:

   - Kill two unused list definitions

   - Ensure that multishot NAPI doesn't age away"

* tag 'io_uring-6.11-20240802' of git://git.kernel.dk/linux:
  io_uring: remove unused local list heads in NAPI functions
  io_uring: keep multishot request NAPI timeout current

Pull thermal control fixes from Rafael Wysocki:
 "These fix a few issues related to the MSI IRQs management in the
  int340x thermal driver, fix a thermal core issue that may lead to
  missing trip point crossing events and update the thermal core
  documentation.

  Specifics:

   - Fix MSI error path cleanup in int340x, allow it to work with a
     subset of thermal MSI IRQs if some of them are not working and make
     it free all MSI IRQs on module exit (Srinivas Pandruvada)

   - Fix a thermal core issue that may lead to missing trip point
     crossing events in some cases when thermal_zone_set_trips() is used
     and update the thermal core documentation (Rafael Wysocki)"

* tag 'thermal-6.11-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  thermal: core: Update thermal zone registration documentation
  thermal: trip: Avoid skipping trips in thermal_zone_set_trips()
  thermal: intel: int340x: Free MSI IRQ vectors on module exit
  thermal: intel: int340x: Allow limited thermal MSI support
  thermal: intel: int340x: Fix kernel warning during MSI cleanup

Pull arm64 fixes from Catalin Marinas:

 - Expand the speculative SSBS errata workaround to more CPUs

 - Ensure jump label changes are visible to all CPUs with a
   kick_all_cpus_sync() (and also enable jump label batching as part of
   the fix)

 - The shadow call stack sanitiser is currently incompatible with Rust,
   make CONFIG_RUST conditional on !CONFIG_SHADOW_CALL_STACK

* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
  arm64: jump_label: Ensure patched jump_labels are visible to all CPUs
  rust: SHADOW_CALL_STACK is incompatible with Rust
  arm64: errata: Expand speculative SSBS workaround (again)
  arm64: cputype: Add Cortex-A725 definitions
  arm64: cputype: Add Cortex-X1C definitions

Pull ceph fix from Ilya Dryomov:
 "A fix for a potential hang in the MDS when cap revocation races with
  the client releasing the caps in question, marked for stable"

* tag 'ceph-for-6.11-rc2' of https://github.com/ceph/ceph-client:
  ceph: force sending a cap update msg back to MDS for revoke op

Pull kvm updates from Paolo Bonzini:
 "The bulk of the changes here is a largish change to guest_memfd,
  delaying the clearing and encryption of guest-private pages until they
  are actually added to guest page tables. This started as "let's make
  it impossible to misuse the API" for SEV-SNP; but then it ballooned a
  bit.

  The new logic is generally simpler and more ready for hugepage support
  in guest_memfd.

  Summary:

   - fix latent bug in how usage of large pages is determined for
     confidential VMs

   - fix "underline too short" in docs

   - eliminate log spam from limited APIC timer periods

   - disallow pre-faulting of memory before SEV-SNP VMs are initialized

   - delay clearing and encrypting private memory until it is added to
     guest page tables

   - this change also enables another small cleanup: the checks in
     SNP_LAUNCH_UPDATE that limit it to non-populated, private pages can
     now be moved in the common kvm_gmem_populate() function

   - fix compilation error that the RISC-V merge introduced in selftests"

* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
  KVM: x86/mmu: fix determination of max NPT mapping level for private pages
  KVM: riscv: selftests: Fix compile error
  KVM: guest_memfd: abstract how prepared folios are recorded
  KVM: guest_memfd: let kvm_gmem_populate() operate only on private gfns
  KVM: extend kvm_range_has_memory_attributes() to check subset of attributes
  KVM: cleanup and add shortcuts to kvm_range_has_memory_attributes()
  KVM: guest_memfd: move check for already-populated page to common code
  KVM: remove kvm_arch_gmem_prepare_needed()
  KVM: guest_memfd: make kvm_gmem_prepare_folio() operate on a single struct kvm
  KVM: guest_memfd: delay kvm_gmem_prepare_folio() until the memory is passed to the guest
  KVM: guest_memfd: return locked folio from __kvm_gmem_get_pfn
  KVM: rename CONFIG_HAVE_KVM_GMEM_* to CONFIG_HAVE_KVM_ARCH_GMEM_*
  KVM: guest_memfd: do not go through struct page
  KVM: guest_memfd: delay folio_mark_uptodate() until after successful preparation
  KVM: guest_memfd: return folio from __kvm_gmem_get_pfn()
  KVM: x86: disallow pre-fault for SNP VMs before initialization
  KVM: Documentation: Fix title underline too short warning
  KVM: x86: Eliminate log spam from limited APIC timer periods

* fix latent bug in how usage of large pages is determined for
  confidential VMs

* fix "underline too short" in docs

* eliminate log spam from limited APIC timer periods

* disallow pre-faulting of memory before SEV-SNP VMs are initialized

* delay clearing and encrypting private memory until it is added to
  guest page tables

* this change also enables another small cleanup: the checks in
  SNP_LAUNCH_UPDATE that limit it to non-populated, private pages
  can now be moved in the common kvm_gmem_populate() function