1. 27 Sep, 2020 1 commit
    • Sumera Priyadarsini's avatar
      scripts: coccicheck: Change default value for parallelism · e16a7c47
      Sumera Priyadarsini authored
      By default, coccicheck utilizes all available threads to implement
      parallelisation. However, when all available threads are used,
      a decrease in performance is noted. The elapsed time is  minimum
      when at most one thread per core is used.
      
      For example, on benchmarking the semantic patch kfree.cocci for
      usb/serial using hyperfine, the outputs obtained for J=5 and J=2
      are 1.32 and 1.90 times faster than those for J=10 and J=9
      respectively for two separate runs. For the larger drivers/staging
      directory, minimium elapsed time is obtained for J=3 which is 1.86
      times faster than that for J=12. The optimal J value does not
      exceed 6 in any of the test runs. The benchmarks are run on a machine
      with 6 cores, with 2 threads per core, i.e, 12 hyperthreads in all.
      
      To improve performance, modify coccicheck to use at most only
      one thread per core by default.
      Signed-off-by: default avatarSumera Priyadarsini <sylphrenadin@gmail.com>
      Signed-off-by: default avatarJulia Lawall <Julia.Lawall@inria.fr>
      e16a7c47
  2. 21 Sep, 2020 1 commit
  3. 13 Sep, 2020 1 commit
  4. 12 Sep, 2020 1 commit
  5. 05 Sep, 2020 1 commit
  6. 02 Sep, 2020 1 commit
  7. 21 Aug, 2020 3 commits
  8. 20 Aug, 2020 4 commits
  9. 19 Aug, 2020 2 commits
    • Arvind Sankar's avatar
      lib/string.c: Use freestanding environment · 33d0f96f
      Arvind Sankar authored
      gcc can transform the loop in a naive implementation of memset/memcpy
      etc into a call to the function itself.  This optimization is enabled by
      -ftree-loop-distribute-patterns.
      
      This has been the case for a while, but gcc-10.x enables this option at
      -O2 rather than -O3 as in previous versions.
      
      Add -ffreestanding, which implicitly disables this optimization with
      gcc.  It is unclear whether clang performs such optimizations, but
      hopefully it will also not do so in a freestanding environment.
      Signed-off-by: default avatarArvind Sankar <nivedita@alum.mit.edu>
      Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56888Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      33d0f96f
    • Arvind Sankar's avatar
      x86/boot/compressed: Use builtin mem functions for decompressor · 394b19d6
      Arvind Sankar authored
      Since commits
      
        c041b5ad ("x86, boot: Create a separate string.h file to provide standard string functions")
        fb4cac57 ("x86, boot: Move memcmp() into string.h and string.c")
      
      the decompressor stub has been using the compiler's builtin memcpy,
      memset and memcmp functions, _except_ where it would likely have the
      largest impact, in the decompression code itself.
      
      Remove the #undef's of memcpy and memset in misc.c so that the
      decompressor code also uses the compiler builtins.
      
      The rationale given in the comment doesn't really apply: just because
      some functions use the out-of-line version is no reason to not use the
      builtin version in the rest.
      
      Replace the comment with an explanation of why memzero and memmove are
      being #define'd.
      
      Drop the suggestion to #undef in boot/string.h as well: the out-of-line
      versions are not really optimized versions, they're generic code that's
      good enough for the preboot environment. The compiler will likely
      generate better code for constant-size memcpy/memset/memcmp if it is
      allowed to.
      
      Most decompressors' performance is unchanged, with the exception of LZ4
      and 64-bit ZSTD.
      
      	Before	After ARCH
      LZ4	  73ms	 10ms   32
      LZ4	 120ms	 10ms	64
      ZSTD	  90ms	 74ms	64
      
      Measurements on QEMU on 2.2GHz Broadwell Xeon, using defconfig kernels.
      
      Decompressor code size has small differences, with the largest being
      that 64-bit ZSTD decreases just over 2k. The largest code size increase
      was on 64-bit XZ, of about 400 bytes.
      Signed-off-by: default avatarArvind Sankar <nivedita@alum.mit.edu>
      Suggested-by: default avatarNick Terrell <nickrterrell@gmail.com>
      Tested-by: default avatarNick Terrell <nickrterrell@gmail.com>
      Acked-by: default avatarKees Cook <keescook@chromium.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      394b19d6
  10. 18 Aug, 2020 5 commits
    • Linus Torvalds's avatar
      Merge tag 'spi-fix-v5.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi · 18445bf4
      Linus Torvalds authored
      Pull spi fixes from Mark Brown:
       "A bunch of fixes that came in for SPI during the merge window.
      
        Some from ST and others for their controller, one from Lukas for a
        race between device addition and controller unregistration and one
        from fix from Geert for the DT bindings which unbreaks validation"
      
      * tag 'spi-fix-v5.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi:
        dt-bindings: lpspi: Add missing boolean type for fsl,spi-only-use-cs1-sel
        spi: stm32: always perform registers configuration prior to transfer
        spi: stm32: fixes suspend/resume management
        spi: stm32: fix stm32_spi_prepare_mbr in case of odd clk_rate
        spi: stm32: fix fifo threshold level in case of short transfer
        spi: stm32h7: fix race condition at end of transfer
        spi: stm32: clear only asserted irq flags on interrupt
        spi: Prevent adding devices below an unregistering controller
      18445bf4
    • Linus Torvalds's avatar
      Merge tag 'fixes-2020-08-18' of git://git.kernel.org/pub/scm/linux/kernel/git/rppt/memblock · 9899b587
      Linus Torvalds authored
      Pull ia64 page table fix from Mike Rapoport:
       "Fix regression in IA-64 caused by page table allocation refactoring
      
        The refactoring and consolidation of <asm/pgalloc.h> caused regression
        on parisc and ia64. The fix for parisc made it into v5.9-rc1 while the
        fix ia64 got delayed a bit and here it is"
      
      * tag 'fixes-2020-08-18' of git://git.kernel.org/pub/scm/linux/kernel/git/rppt/memblock:
        arch/ia64: Restore arch-specific pgd_offset_k implementation
      9899b587
    • Yang Shi's avatar
      mm/memory.c: skip spurious TLB flush for retried page fault · b7333b58
      Yang Shi authored
      Recently we found regression when running will_it_scale/page_fault3 test
      on ARM64.  Over 70% down for the multi processes cases and over 20% down
      for the multi threads cases.  It turns out the regression is caused by
      commit 89b15332 ("mm: drop mmap_sem before calling
      balance_dirty_pages() in write fault").
      
      The test mmaps a memory size file then write to the mapping, this would
      make all memory dirty and trigger dirty pages throttle, that upstream
      commit would release mmap_sem then retry the page fault.  The retried
      page fault would see correct PTEs installed then just fall through to
      spurious TLB flush.  The regression is caused by the excessive spurious
      TLB flush.  It is fine on x86 since x86's spurious TLB flush is no-op.
      
      We could just skip the spurious TLB flush to mitigate the regression.
      Suggested-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      Reported-by: default avatarXu Yu <xuyu@linux.alibaba.com>
      Debugged-by: default avatarXu Yu <xuyu@linux.alibaba.com>
      Tested-by: default avatarXu Yu <xuyu@linux.alibaba.com>
      Cc: Johannes Weiner <hannes@cmpxchg.org>
      Cc: Catalin Marinas <catalin.marinas@arm.com>
      Cc: Will Deacon <will.deacon@arm.com>
      Cc: <stable@vger.kernel.org>
      Signed-off-by: default avatarYang Shi <shy828301@gmail.com>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      b7333b58
    • Linus Torvalds's avatar
      Merge tag 'pstore-v5.9-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux · 06a4ec1d
      Linus Torvalds authored
      Pull mailmap update from Kees Cook:
       "This was originally part of my pstore tree, but when I realized that
        mailmap needed re-alphabetizing, I decided to wait until -rc1 to send
        this, as I saw a lot of mailmap additions pending in -next for the
        merge window.
      
        It's a programmatic reordering and the addition of a pstore
        contributor's preferred email address"
      
      * tag 'pstore-v5.9-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux:
        mailmap: Add WeiXiong Liao
        mailmap: Restore dictionary sorting
      06a4ec1d
    • Linus Torvalds's avatar
      Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net · 4cf75621
      Linus Torvalds authored
      Pull networking fixes from David Miller:
       "Another batch of fixes:
      
        1) Remove nft_compat counter flush optimization, it generates warnings
           from the refcount infrastructure. From Florian Westphal.
      
        2) Fix BPF to search for build id more robustly, from Jiri Olsa.
      
        3) Handle bogus getopt lengths in ebtables, from Florian Westphal.
      
        4) Infoleak and other fixes to j1939 CAN driver, from Eric Dumazet and
           Oleksij Rempel.
      
        5) Reset iter properly on mptcp sendmsg() error, from Florian
           Westphal.
      
        6) Show a saner speed in bonding broadcast mode, from Jarod Wilson.
      
        7) Various kerneldoc fixes in bonding and elsewhere, from Lee Jones.
      
        8) Fix double unregister in bonding during namespace tear down, from
           Cong Wang.
      
        9) Disable RP filter during icmp_redirect selftest, from David Ahern"
      
      * git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net: (75 commits)
        otx2_common: Use devm_kcalloc() in otx2_config_npa()
        net: qrtr: fix usage of idr in port assignment to socket
        selftests: disable rp_filter for icmp_redirect.sh
        Revert "net: xdp: pull ethernet header off packet after computing skb->protocol"
        phylink: <linux/phylink.h>: fix function prototype kernel-doc warning
        mptcp: sendmsg: reset iter on error redux
        net: devlink: Remove overzealous WARN_ON with snapshots
        tipc: not enable tipc when ipv6 works as a module
        tipc: fix uninit skb->data in tipc_nl_compat_dumpit()
        net: Fix potential wrong skb->protocol in skb_vlan_untag()
        net: xdp: pull ethernet header off packet after computing skb->protocol
        ipvlan: fix device features
        bonding: fix a potential double-unregister
        can: j1939: add rxtimer for multipacket broadcast session
        can: j1939: abort multipacket broadcast session when timeout occurs
        can: j1939: cancel rxtimer on multipacket broadcast session complete
        can: j1939: fix support for multipacket broadcast message
        net: fddi: skfp: cfm: Remove seemingly unused variable 'ID_sccs'
        net: fddi: skfp: cfm: Remove set but unused variable 'oldstate'
        net: fddi: skfp: smt: Remove seemingly unused variable 'ID_sccs'
        ...
      4cf75621
  11. 17 Aug, 2020 16 commits
  12. 16 Aug, 2020 4 commits
    • David S. Miller's avatar
      Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf · 8c26544f
      David S. Miller authored
      Pablo Neira Ayuso says:
      
      ====================
      Netfilter fixes for net
      
      The following patchset contains Netfilter fixes for net:
      
      1) Endianness issue in IPv4 option support in nft_exthdr,
         from Stephen Suryaputra.
      
      2) Removes the waitcount optimization in nft_compat,
         from Florian Westphal.
      
      3) Remove ipv6 -> nf_defrag_ipv6 module dependency, from
         Florian Westphal.
      
      4) Memleak in chain binding support, also from Florian.
      
      5) Simplify nft_flowtable.sh selftest, from Fabian Frederick.
      
      6) Optional MTU arguments for selftest nft_flowtable.sh,
         also from Fabian.
      
      7) Remove noise error report when killing process in
         selftest nft_flowtable.sh, from Fabian Frederick.
      
      8) Reject bogus getsockopt option length in ebtables,
         from Florian Westphal.
      ====================
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      8c26544f
    • David S. Miller's avatar
      Merge tag 'linux-can-fixes-for-5.9-20200815' of... · 71a50419
      David S. Miller authored
      Merge tag 'linux-can-fixes-for-5.9-20200815' of git://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can
      
      Marc Kleine-Budde says:
      
      ====================
      pull-request: can 2020-08-15
      
      this is a pull request of 4 patches for net/master.
      
      All patches are by Zhang Changzhong and fix broadcast related problems in the
      j1939 CAN networking stack.
      ====================
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      71a50419
    • Miaohe Lin's avatar
      net: Fix potential wrong skb->protocol in skb_vlan_untag() · 55eff0eb
      Miaohe Lin authored
      We may access the two bytes after vlan_hdr in vlan_set_encap_proto(). So
      we should pull VLAN_HLEN + sizeof(unsigned short) in skb_vlan_untag() or
      we may access the wrong data.
      
      Fixes: 0d5501c1 ("net: Always untag vlan-tagged traffic on input.")
      Signed-off-by: default avatarMiaohe Lin <linmiaohe@huawei.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      55eff0eb
    • Jason A. Donenfeld's avatar
      net: xdp: pull ethernet header off packet after computing skb->protocol · f8414a8d
      Jason A. Donenfeld authored
      When an XDP program changes the ethernet header protocol field,
      eth_type_trans is used to recalculate skb->protocol. In order for
      eth_type_trans to work correctly, the ethernet header must actually be
      part of the skb data segment, so the code first pushes that onto the
      head of the skb. However, it subsequently forgets to pull it back off,
      making the behavior of the passed-on packet inconsistent between the
      protocol modifying case and the static protocol case. This patch fixes
      the issue by simply pulling the ethernet header back off of the skb
      head.
      
      Fixes: 29724956 ("net: fix generic XDP to handle if eth header was mangled")
      Cc: Jesper Dangaard Brouer <brouer@redhat.com>
      Cc: David S. Miller <davem@davemloft.net>
      Signed-off-by: default avatarJason A. Donenfeld <Jason@zx2c4.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      f8414a8d