- 24 Aug, 2021 15 commits
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Vineet Gupta authored
There's no known/active customer using them with latest kernels anyways. Removal helps cleanup code and remove the hack for MMU_VER to MMU_V[3-4] conversion Signed-off-by: Vineet Gupta <vgupta@kernel.org>
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Vineet Gupta authored
There's no known/active customer using them with latest kernels anyways. Signed-off-by: Vineet Gupta <vgupta@kernel.org>
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Vineet Gupta authored
And move them out of cmpxchg.h to canonical atomic.h Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Vineet Gupta <vgupta@kernel.org>
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Vineet Gupta authored
It only makes sense to do this for the LLSC config Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Vineet Gupta <vgupta@kernel.org>
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Vineet Gupta authored
Existing code forces/assume args to type "long" which won't work in LP64 regime, so prepare code for that Interestingly this should be a non functional change but I do see some codegen changes | bloat-o-meter vmlinux-cmpxchg-A vmlinux-cmpxchg-B | add/remove: 0/0 grow/shrink: 17/12 up/down: 218/-150 (68) | | Function old new delta | rwsem_optimistic_spin 518 550 +32 | rwsem_down_write_slowpath 1244 1274 +30 | __do_sys_perf_event_open 2576 2600 +24 | down_read 192 200 +8 | __down_read 192 200 +8 ... | task_work_run 168 148 -20 | dma_fence_chain_walk.part 760 736 -24 | __genradix_ptr_alloc 674 646 -28 Total: Before=6187409, After=6187477, chg +0.00% Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Vineet Gupta <vgupta@kernel.org>
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Vineet Gupta authored
It gets in the way of cleaning things up and is a maintenance pain-in-neck ! Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Vineet Gupta <vgupta@kernel.org>
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Vineet Gupta authored
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Vineet Gupta <vgupta@kernel.org>
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Vineet Gupta authored
- !LLSC now only needs a single spinlock for atomics and bitops - Some codegen changes (slight bloat) with generic bitops 1. code increase due to LD-check-atomic paradigm vs. unconditonal atomic (but dirty'ing the cache line even if set already). So despite increase, generic is right thing to do. 2. code decrease (but use of costlier instructions such as DIV vs. shifts based math) due to signed arithmetic. This needs to be revisited seperately. arc: static inline int test_bit(unsigned int nr, const volatile unsigned long *addr) ^^^^^^^^^^^^ generic: static inline int test_bit(int nr, const volatile unsigned long *addr) ^^^ Link: https://lore.kernel.org/r/20180830135749.GA13005@arm.comSigned-off-by: Will Deacon <will@kernel.org> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> [vgupta: wrote patch based on Will's poc, analysed codegen diffs] Signed-off-by: Vineet Gupta <vgupta@kernel.org>
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Vineet Gupta authored
The current ARC fetch/return atomics provide fully ordered semantics only with 2 full barriers around the operation. Instead implement them as relaxed variants without any barriers and rely on generic code to generate the fully-ordered, acquire and release varaints by adding the appropriate full barriers. This helps elide some extra barriers in case of acquire/release/relaxed calls. bloat-o-meter for hsdk defconfig shows codegen improvements, although numbers below inflated due to unrelated inlining heuristic changes | bloat-o-meter vmlinux-643babe34fd7-non-relaxed vmlinux-45aa05cb44d7-relaxed | add/remove: 2/5 grow/shrink: 42/1222 up/down: 4158/-14312 (-10154) | Function old new delta | .. | sys_renameat 462 476 +14 | ip_mc_inc_group 424 436 +12 | do_read_cache_page 1882 1894 +12 | .. | refcount_dec_and_mutex_lock 254 250 -4 | refcount_dec_and_lock_irqsave 258 254 -4 | refcount_dec_and_lock 254 250 -4 | .. | tcp_v6_route_req 246 238 -8 | tcp_v4_destroy_sock 286 278 -8 | tcp_twsk_unique 352 344 -8 Link: https://lore.kernel.org/r/20180830144344.GW24142@hirez.programming.kicks-ass.netSuggested-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Vineet Gupta <vgupta@kernel.org>
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Vineet Gupta authored
This is a non-functional change since those wrappers are not used in kernel sources at all. Link: http://lists.infradead.org/pipermail/linux-snps-arc/2018-August/004246.htmlSuggested-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Vineet Gupta <vgupta@kernel.org>
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Vineet Gupta authored
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Vineet Gupta <vgupta@kernel.org>
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Vineet Gupta authored
!LLSC atomics use spinlock (SMP) or irq-disable (UP) to implement criticla regions. UP atomic_set() however was "cheating" by not doing any of that so and still being functional. Remove this anomaly (primarily as cleanup for future code improvements) given that this config is not worth hassle of special case code. Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Vineet Gupta <vgupta@kernel.org>
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Vineet Gupta authored
Non functional change, to ease future addition/removal Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Vineet Gupta <vgupta@kernel.org>
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Randy Dunlap authored
0day bot reports a build error: ERROR: modpost: "clear_user_page" [drivers/media/v4l2-core/videobuf-dma-sg.ko] undefined! so export it in arch/arc/ to fix the build error. In most ARCHes, clear_user_page() is a macro. OTOH, in a few ARCHes it is a function and needs to be exported. PowerPC exported it in 2004. It looks like nds32 and nios2 still need to have it exported. Fixes: 4102b533 ("ARC: [mm] Aliasing VIPT dcache support 2/4") Signed-off-by: Randy Dunlap <rdunlap@infradead.org> Reported-by: kernel test robot <lkp@intel.com> Cc: Guenter Roeck <linux@roeck-us.net> Cc: linux-snps-arc@lists.infradead.org Signed-off-by: Vineet Gupta <vgupta@kernel.org>
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Changcheng Deng authored
Some typos are found out by codespell tool: ./intc-compact.c:145: prioity ==> priority ./smp.c:286: recevier ==> receiver ./stacktrace.c:152 prelogue ==> prologue Fix typos found by codespell. Reported-by: Zeal Robot <zealci@zte.com.cn> Signed-off-by: Changcheng Deng <deng.changcheng@zte.com.cn> Signed-off-by: Yi Wang <wang.yi59@zte.com.cn> Signed-off-by: Vineet Gupta <vgupta@kernel.org>
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- 22 Aug, 2021 2 commits
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Linus Torvalds authored
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git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linuxLinus Torvalds authored
Pull powerpc fixes from Michael Ellerman: - Fix random crashes on some 32-bit CPUs by adding isync() after locking/unlocking KUEP - Fix intermittent crashes when loading modules with strict module RWX - Fix a section mismatch introduce by a previous fix. Thanks to Christophe Leroy, Fabiano Rosas, Laurent Vivier, Murilo Opsfelder Araújo, Nathan Chancellor, and Stan Johnson. h# -----BEGIN PGP SIGNATURE----- * tag 'powerpc-5.14-6' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: powerpc/mm: Fix set_memory_*() against concurrent accesses powerpc/32s: Fix random crashes by adding isync() after locking/unlocking KUEP powerpc/xive: Do not mark xive_request_ipi() as __init
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- 21 Aug, 2021 9 commits
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git://git.kernel.org/pub/scm/linux/kernel/git/clk/linuxLinus Torvalds authored
Pull clk driver fixes from Stephen Boyd: - Make the regulator state match the GDSC power domain state at boot on Qualcomm SoCs so that the regulator isn't turned off inadvertently. - Fix earlycon on i.MX6Q SoCs * tag 'clk-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux: clk: qcom: gdsc: Ensure regulator init state matches GDSC state clk: imx6q: fix uart earlycon unwork
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git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-miscLinus Torvalds authored
Pull char/misc driver fixes from Greg KH: "Here are some small driver fixes for 5.14-rc7. They consist of: - revert for an interconnect patch that was found to have problems - ipack tpci200 driver fixes for reported problems - slimbus messaging and ngd fixes for reported problems All are small and have been in linux-next for a while with no reported issues" * tag 'char-misc-5.14-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: ipack: tpci200: fix memory leak in the tpci200_register ipack: tpci200: fix many double free issues in tpci200_pci_probe slimbus: ngd: reset dma setup during runtime pm slimbus: ngd: set correct device for pm slimbus: messaging: check for valid transaction id slimbus: messaging: start transaction ids from 1 instead of zero Revert "interconnect: qcom: icc-rpmh: Add BCMs to commit list in pre_aggregate"
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git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usbLinus Torvalds authored
Pull USB fix from Greg KH: "Here is a single USB typec tcpm fix for a reported problem for 5.14-rc7. It showed up in 5.13 and resolves an issue that Hans found. It has been in linux-next this week with no reported problems" * tag 'usb-5.14-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb: usb: typec: tcpm: Fix VDMs sometimes not being forwarded to alt-mode drivers
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git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linuxLinus Torvalds authored
Pull RISC-V fixes from Palmer Dabbelt: - fix the sifive-l2-cache device tree bindings for json-schema compatibility. This does not change the intended behavior of the binding. - avoid improperly freeing necessary resources during early boot. * tag 'riscv-for-linus-5.14-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux: riscv: Fix a number of free'd resources in init_resources() dt-bindings: sifive-l2-cache: Fix 'select' matching
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git://git.kernel.org/pub/scm/linux/kernel/git/s390/linuxLinus Torvalds authored
Pull s390 fix from Vasily Gorbik: - fix use after free of zpci_dev in pci code * tag 's390-5.14-5' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: s390/pci: fix use after free of zpci_dev
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git://git.kernel.org/pub/scm/linux/kernel/git/jlayton/linuxLinus Torvalds authored
Pull mandatory file locking deprecation warning from Jeff Layton: "As discussed on the list, this patch just adds a new warning for folks who still have mandatory locking enabled and actually mount with '-o mand'. I'd like to get this in for v5.14 so we can push this out into stable kernels and hopefully reach folks who have mounts with -o mand. For now, I'm operating under the assumption that we'll fully remove this support in v5.15, but we can move that out if any legitimate users of this facility speak up between now and then" * tag 'locks-v5.14' of git://git.kernel.org/pub/scm/linux/kernel/git/jlayton/linux: fs: warn about impending deprecation of mandatory locks
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git://git.kernel.dk/linux-blockLinus Torvalds authored
Pull block fixes from Jens Axboe: "Three fixes from Ming Lei that should go into 5.14: - Fix for a kernel panic when iterating over tags for some cases where a flush request is present, a regression in this cycle. - Request timeout fix - Fix flush request checking" * tag 'block-5.14-2021-08-20' of git://git.kernel.dk/linux-block: blk-mq: fix is_flush_rq blk-mq: fix kernel panic during iterating over flush request blk-mq: don't grab rq's refcount in blk_mq_check_expired()
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git://git.kernel.dk/linux-blockLinus Torvalds authored
Pull io_uring fixes from Jens Axboe: "A few small fixes that should go into this release: - Fix never re-assigning an initial error value for io_uring_enter() for SQPOLL, if asked to do nothing - Fix xa_alloc_cycle() return value checking, for cases where we have wrapped around - Fix for a ctx pin issue introduced in this cycle (Pavel)" * tag 'io_uring-5.14-2021-08-20' of git://git.kernel.dk/linux-block: io_uring: fix xa_alloc_cycle() error return value check io_uring: pin ctx on fallback execution io_uring: only assign io_uring_enter() SQPOLL error in actual error case
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Jeff Layton authored
We've had CONFIG_MANDATORY_FILE_LOCKING since 2015 and a lot of distros have disabled it. Warn the stragglers that still use "-o mand" that we'll be dropping support for that mount option. Cc: stable@vger.kernel.org Signed-off-by: Jeff Layton <jlayton@kernel.org>
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- 20 Aug, 2021 14 commits
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Jens Axboe authored
We currently check for ret != 0 to indicate error, but '1' is a valid return and just indicates that the allocation succeeded with a wrap. Correct the check to be for < 0, like it was before the xarray conversion. Cc: stable@vger.kernel.org Fixes: 61cf9370 ("io_uring: Convert personality_idr to XArray") Signed-off-by: Jens Axboe <axboe@kernel.dk>
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git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pmLinus Torvalds authored
Pull ACPI fixes from Rafael Wysocki: "These fix two mistakes in new code. Specifics: - Prevent confusing messages from being printed if the PRMT table is not present or there are no PRM modules (Aubrey Li). - Fix the handling of suspend-to-idle entry and exit in the case when the Microsoft UUID is used with the Low-Power S0 Idle _DSM interface (Mario Limonciello)" * tag 'acpi-5.14-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: ACPI: PM: s2idle: Invert Microsoft UUID entry and exit ACPI: PRM: Deal with table not present or no module found
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git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pmLinus Torvalds authored
Pull power management fixes from Rafael Wysocki: "These fix some issues in the ARM cpufreq drivers and in the operating performance points (OPP) framework. Specifics: - Fix useless WARN() in the OPP core and prevent a noisy warning from being printed by OPP _put functions (Dmitry Osipenko). - Fix error path when allocation failed in the arm_scmi cpufreq driver (Lukasz Luba). - Blacklist Qualcomm sc8180x and Qualcomm sm8150 in cpufreq-dt-platdev (Bjorn Andersson, Thara Gopinath). - Forbid cpufreq for 1.2 GHz variant in the armada-37xx cpufreq driver (Marek Behún)" * tag 'pm-5.14-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: opp: Drop empty-table checks from _put functions cpufreq: armada-37xx: forbid cpufreq for 1.2 GHz variant cpufreq: blocklist Qualcomm sm8150 in cpufreq-dt-platdev cpufreq: arm_scmi: Fix error path when allocation failed opp: remove WARN when no valid OPPs remain cpufreq: blacklist Qualcomm sc8180x in cpufreq-dt-platdev
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Linus Torvalds authored
Merge misc fixes from Andrew Morton: "10 patches. Subsystems affected by this patch series: MAINTAINERS and mm (shmem, pagealloc, tracing, memcg, memory-failure, vmscan, kfence, and hugetlb)" * emailed patches from Andrew Morton <akpm@linux-foundation.org>: hugetlb: don't pass page cache pages to restore_reserve_on_error kfence: fix is_kfence_address() for addresses below KFENCE_POOL_SIZE mm: vmscan: fix missing psi annotation for node_reclaim() mm/hwpoison: retry with shake_page() for unhandlable pages mm: memcontrol: fix occasional OOMs due to proportional memory.low reclaim MAINTAINERS: update ClangBuiltLinux IRC chat mmflags.h: add missing __GFP_ZEROTAGS and __GFP_SKIP_KASAN_POISON names mm/page_alloc: don't corrupt pcppage_migratetype Revert "mm: swap: check if swap backing device is congested or not" Revert "mm/shmem: fix shmem_swapin() race with swapoff"
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git://anongit.freedesktop.org/drm/drmLinus Torvalds authored
Pull drm fixes from Dave Airlie: "Regularly scheduled fixes. The ttm one solves a problem of GPU drivers failing to load if debugfs is off in Kconfig, otherwise the i915 and mediatek, and amdgpu fixes all fairly normal. Nouveau has a couple of display fixes, but it has a fix for a longstanding race condition in it's memory manager code, and the fix mostly removes some code that wasn't working properly and has no userspace users. This fix makes the diffstat kinda larger but in a good (negative line-count) way. core: - fix drm_wait_vblank uapi copying bug ttm: - fix debugfs init when debugfs is off amdgpu: - vega10 SMU workload fix - DCN VM fix - DCN 3.01 watermark fix amdkfd: - SVM fix nouveau: - ampere display fixes - remove MM misfeature to fix a longstanding race condition i915: - tweaked display workaround for all PCHs - eDP MSO pipe sanity for ADL-P fix - remove unused symbol export mediatek: - AAL output size setting - Delete component in remove function" * tag 'drm-fixes-2021-08-20-3' of git://anongit.freedesktop.org/drm/drm: drm/amd/display: Use DCN30 watermark calc for DCN301 drm/i915/dp: remove superfluous EXPORT_SYMBOL() drm/i915/edp: fix eDP MSO pipe sanity checks for ADL-P drm/i915: Tweaked Wa_14010685332 for all PCHs drm/nouveau: rip out nvkm_client.super drm/nouveau: block a bunch of classes from userspace drm/nouveau/fifo/nv50-: rip out dma channels drm/nouveau/kms/nv50: workaround EFI GOP window channel format differences drm/nouveau/disp: power down unused DP links during init drm/nouveau: recognise GA107 drm: Copy drm_wait_vblank to user before returning drm/amd/display: Ensure DCN save after VM setup drm/amdkfd: fix random KFDSVMRangeTest.SetGetAttributesTest test failure drm/amd/pm: change the workload type for some cards Revert "drm/amd/pm: fix workload mismatch on vega10" drm: ttm: Don't bail from ttm_global_init if debugfs_create_dir fails drm/mediatek: Add component_del in OVL and COLOR remove function drm/mediatek: Add AAL output size configuration
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git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pciLinus Torvalds authored
Pull PCI fixes from Bjorn Helgaas: - Add Rahul Tanwar as Intel LGM Gateway PCIe maintainer (Rahul Tanwar) - Add Jim Quinlan et al as Broadcom STB PCIe maintainers (Jim Quinlan) - Increase D3hot-to-D0 delay for AMD Renoir/Cezanne XHCI (Marcin Bachry) - Correct iomem_get_mapping() usage for legacy_mem sysfs (Krzysztof Wilczyński) * tag 'pci-v5.14-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci: PCI/sysfs: Use correct variable for the legacy_mem sysfs object PCI: Increase D3 delay for AMD Renoir/Cezanne XHCI MAINTAINERS: Add Jim Quinlan et al as Broadcom STB PCIe maintainers MAINTAINERS: Add Rahul Tanwar as Intel LGM Gateway PCIe maintainer
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git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmcLinus Torvalds authored
Pull MMC host fixes from Ulf Hansson: - dw_mmc: Fix hang on data CRC error - mmci: Fix voltage switch procedure for the stm32 variant - sdhci-iproc: Fix some clock issues for BCM2711 - sdhci-msm: Fixup software timeout value * tag 'mmc-v5.14-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc: mmc: sdhci-iproc: Set SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN on BCM2711 mmc: sdhci-iproc: Cap min clock frequency on BCM2711 mmc: sdhci-msm: Update the software timeout value for sdhc mmc: mmci: stm32: Check when the voltage switch procedure should be done mmc: dw_mmc: Fix hang on data CRC error
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git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/soundLinus Torvalds authored
Pull more sound fixes from Takashi Iwai: "This is a quick follow up for 5.14: a fix for a very recently introduced regression on ASoC Intel Atom driver, and another trivial HD-audio quirk for HP laptops" * tag 'sound-5.14-rc7-2' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound: ASoC: intel: atom: Fix breakage for PCM buffer address setup ALSA: hda/realtek: Limit mic boost on HP ProBook 445 G8
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git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linuxLinus Torvalds authored
Pull arm64 fixes from Will Deacon: - Fix cleaning of vDSO directories - Ensure CNTHCTL_EL2 is fully initialised when booting at EL2 * tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux: arm64: initialize all of CNTHCTL_EL2 arm64: clean vdso & vdso32 files
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Rafael J. Wysocki authored
* acpi-pm: ACPI: PM: s2idle: Invert Microsoft UUID entry and exit
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git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommuLinus Torvalds authored
Pull iommu fixes from Joerg Roedel: - Fix for a potential NULL-ptr dereference in IOMMU core code - Two resource leak fixes - Cache flush fix in the Intel VT-d driver * tag 'iommu-fixes-v5.14-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu: iommu/vt-d: Fix incomplete cache flush in intel_pasid_tear_down_entry() iommu/vt-d: Fix PASID reference leak iommu: Check if group is NULL before remove device iommu/dma: Fix leak in non-contiguous API
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Rafael J. Wysocki authored
* pm-opp: opp: Drop empty-table checks from _put functions opp: remove WARN when no valid OPPs remain
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Mike Kravetz authored
syzbot hit kernel BUG at fs/hugetlbfs/inode.c:532 as described in [1]. This BUG triggers if the HPageRestoreReserve flag is set on a page in the page cache. It should never be set, as the routine huge_add_to_page_cache explicitly clears the flag after adding a page to the cache. The only code other than huge page allocation which sets the flag is restore_reserve_on_error. It will potentially set the flag in rare out of memory conditions. syzbot was injecting errors to cause memory allocation errors which exercised this specific path. The code in restore_reserve_on_error is doing the right thing. However, there are instances where pages in the page cache were being passed to restore_reserve_on_error. This is incorrect, as once a page goes into the cache reservation information will not be modified for the page until it is removed from the cache. Error paths do not remove pages from the cache, so even in the case of error, the page will remain in the cache and no reservation adjustment is needed. Modify routines that potentially call restore_reserve_on_error with a page cache page to no longer do so. Note on fixes tag: Prior to commit 846be085 ("mm/hugetlb: expand restore_reserve_on_error functionality") the routine would not process page cache pages because the HPageRestoreReserve flag is not set on such pages. Therefore, this issue could not be trigggered. The code added by commit 846be085 ("mm/hugetlb: expand restore_reserve_on_error functionality") is needed and correct. It exposed incorrect calls to restore_reserve_on_error which is the root cause addressed by this commit. [1] https://lore.kernel.org/linux-mm/00000000000050776d05c9b7c7f0@google.com/ Link: https://lkml.kernel.org/r/20210818213304.37038-1-mike.kravetz@oracle.com Fixes: 846be085 ("mm/hugetlb: expand restore_reserve_on_error functionality") Signed-off-by: Mike Kravetz <mike.kravetz@oracle.com> Reported-by: <syzbot+67654e51e54455f1c585@syzkaller.appspotmail.com> Cc: Mina Almasry <almasrymina@google.com> Cc: Axel Rasmussen <axelrasmussen@google.com> Cc: Peter Xu <peterx@redhat.com> Cc: Muchun Song <songmuchun@bytedance.com> Cc: Michal Hocko <mhocko@suse.com> Cc: Naoya Horiguchi <naoya.horiguchi@linux.dev> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Marco Elver authored
Originally the addr != NULL check was meant to take care of the case where __kfence_pool == NULL (KFENCE is disabled). However, this does not work for addresses where addr > 0 && addr < KFENCE_POOL_SIZE. This can be the case on NULL-deref where addr > 0 && addr < PAGE_SIZE or any other faulting access with addr < KFENCE_POOL_SIZE. While the kernel would likely crash, the stack traces and report might be confusing due to double faults upon KFENCE's attempt to unprotect such an address. Fix it by just checking that __kfence_pool != NULL instead. Link: https://lkml.kernel.org/r/20210818130300.2482437-1-elver@google.com Fixes: 0ce20dd8 ("mm: add Kernel Electric-Fence infrastructure") Signed-off-by: Marco Elver <elver@google.com> Reported-by: Kuan-Ying Lee <Kuan-Ying.Lee@mediatek.com> Acked-by: Alexander Potapenko <glider@google.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: <stable@vger.kernel.org> [5.12+] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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