Re: [tip:x86/percpu 21/22] arch/x86/include/asm/processor.h:522:24: sparse: sparse: dereference of noderef expression

From: Uros Bizjak
Date: Fri Oct 27 2023 - 03:47:16 EST

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In reply to: kernel test robot: "[tip:x86/percpu 21/22] arch/x86/include/asm/processor.h:522:24: sparse: sparse: dereference of noderef expression"
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On Fri, Oct 27, 2023 at 4:01 AM kernel test robot <lkp@xxxxxxxxx> wrote:
>
> tree: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86/percpu
> head: 0548eb067ed664b93043e033295ca71e3e706245
> commit: ed2f752e0e0a21d941ca0ee539ef3d4cd576bc5e [21/22] x86/percpu: Introduce const-qualified const_pcpu_hot to micro-optimize code generation
> config: x86_64-randconfig-122-20231027 (https://download.01.org/0day-ci/archive/20231027/202310270909.QBAOkiZP-lkp@xxxxxxxxx/config)
> compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231027/202310270909.QBAOkiZP-lkp@xxxxxxxxx/reproduce)
>
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <lkp@xxxxxxxxx>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202310270909.QBAOkiZP-lkp@xxxxxxxxx/

Already fixed in [1].

[1] https://lore.kernel.org/lkml/20231024142830.3226-1-ubizjak@xxxxxxxxx/

Thanks,
Uros.

>
> sparse warnings: (new ones prefixed by >>)
> kernel/entry/common.c: note: in included file (through include/linux/sched.h, include/linux/context_tracking.h):
> arch/x86/include/asm/current.h:46:24: sparse: sparse: dereference of noderef expression
> arch/x86/include/asm/current.h:46:24: sparse: sparse: dereference of noderef expression
> arch/x86/include/asm/current.h:46:24: sparse: sparse: dereference of noderef expression
> arch/x86/include/asm/current.h:46:24: sparse: sparse: dereference of noderef expression
> arch/x86/include/asm/current.h:46:24: sparse: sparse: dereference of noderef expression
> arch/x86/include/asm/current.h:46:24: sparse: sparse: dereference of noderef expression
> arch/x86/include/asm/current.h:46:24: sparse: sparse: dereference of noderef expression
> arch/x86/include/asm/current.h:46:24: sparse: sparse: dereference of noderef expression
> kernel/entry/common.c: note: in included file (through arch/x86/include/asm/cpufeature.h, arch/x86/include/asm/thread_info.h, include/linux/thread_info.h, ...):
> >> arch/x86/include/asm/processor.h:522:24: sparse: sparse: dereference of noderef expression
> kernel/entry/common.c: note: in included file (through include/linux/sched.h, include/linux/context_tracking.h):
> arch/x86/include/asm/current.h:46:24: sparse: sparse: dereference of noderef expression
> arch/x86/include/asm/current.h:46:24: sparse: sparse: dereference of noderef expression
> arch/x86/include/asm/current.h:46:24: sparse: sparse: dereference of noderef expression
> arch/x86/include/asm/current.h:46:24: sparse: sparse: dereference of noderef expression
> arch/x86/include/asm/current.h:46:24: sparse: sparse: dereference of noderef expression
> arch/x86/include/asm/current.h:46:24: sparse: sparse: dereference of noderef expression
> arch/x86/include/asm/current.h:46:24: sparse: sparse: dereference of noderef expression
> arch/x86/include/asm/current.h:46:24: sparse: sparse: dereference of noderef expression
> arch/x86/include/asm/current.h:46:24: sparse: sparse: dereference of noderef expression
> arch/x86/include/asm/current.h:46:24: sparse: sparse: dereference of noderef expression
> arch/x86/include/asm/current.h:46:24: sparse: sparse: dereference of noderef expression
> kernel/entry/common.c: note: in included file (through arch/x86/include/asm/cpufeature.h, arch/x86/include/asm/thread_info.h, include/linux/thread_info.h, ...):
> >> arch/x86/include/asm/processor.h:522:24: sparse: sparse: dereference of noderef expression
> kernel/entry/common.c: note: in included file (through include/linux/sched.h, include/linux/context_tracking.h):
> arch/x86/include/asm/current.h:46:24: sparse: sparse: dereference of noderef expression
> arch/x86/include/asm/current.h:46:24: sparse: sparse: dereference of noderef expression
> arch/x86/include/asm/current.h:46:24: sparse: sparse: dereference of noderef expression
> kernel/entry/common.c: note: in included file (through arch/x86/include/asm/cpufeature.h, arch/x86/include/asm/thread_info.h, include/linux/thread_info.h, ...):
> >> arch/x86/include/asm/processor.h:522:24: sparse: sparse: dereference of noderef expression
> kernel/entry/common.c: note: in included file (through include/linux/sched.h, include/linux/context_tracking.h):
> arch/x86/include/asm/current.h:46:24: sparse: sparse: dereference of noderef expression
> arch/x86/include/asm/current.h:46:24: sparse: sparse: dereference of noderef expression
> arch/x86/include/asm/current.h:46:24: sparse: sparse: dereference of noderef expression
> arch/x86/include/asm/current.h:46:24: sparse: sparse: dereference of noderef expression
> arch/x86/include/asm/current.h:46:24: sparse: sparse: dereference of noderef expression
> arch/x86/include/asm/current.h:46:24: sparse: sparse: dereference of noderef expression
> arch/x86/include/asm/current.h:46:24: sparse: sparse: dereference of noderef expression
> arch/x86/include/asm/current.h:46:24: sparse: sparse: dereference of noderef expression
> arch/x86/include/asm/current.h:46:24: sparse: sparse: dereference of noderef expression
> arch/x86/include/asm/current.h:46:24: sparse: sparse: dereference of noderef expression
> arch/x86/include/asm/current.h:46:24: sparse: sparse: dereference of noderef expression
> arch/x86/include/asm/current.h:46:24: sparse: sparse: dereference of noderef expression
> arch/x86/include/asm/current.h:46:24: sparse: sparse: dereference of noderef expression
> arch/x86/include/asm/current.h:46:24: sparse: sparse: dereference of noderef expression
> arch/x86/include/asm/current.h:46:24: sparse: sparse: dereference of noderef expression
> arch/x86/include/asm/current.h:46:24: sparse: sparse: dereference of noderef expression
> arch/x86/include/asm/current.h:46:24: sparse: sparse: dereference of noderef expression
> arch/x86/include/asm/current.h:46:24: sparse: sparse: dereference of noderef expression
> arch/x86/include/asm/current.h:46:24: sparse: sparse: dereference of noderef expression
> arch/x86/include/asm/current.h:46:24: sparse: sparse: dereference of noderef expression
> arch/x86/include/asm/current.h:46:24: sparse: sparse: dereference of noderef expression
> arch/x86/include/asm/current.h:46:24: sparse: sparse: dereference of noderef expression
> arch/x86/include/asm/current.h:46:24: sparse: sparse: dereference of noderef expression
> arch/x86/include/asm/current.h:46:24: sparse: sparse: dereference of noderef expression
> arch/x86/include/asm/current.h:46:24: sparse: sparse: dereference of noderef expression
> arch/x86/include/asm/current.h:46:24: sparse: sparse: dereference of noderef expression
> kernel/entry/common.c: note: in included file (through arch/x86/include/asm/cpufeature.h, arch/x86/include/asm/thread_info.h, include/linux/thread_info.h, ...):
> >> arch/x86/include/asm/processor.h:522:24: sparse: sparse: dereference of noderef expression
> kernel/entry/common.c: note: in included file (through include/linux/sched.h, include/linux/context_tracking.h):
> arch/x86/include/asm/current.h:46:24: sparse: sparse: dereference of noderef expression
> arch/x86/include/asm/current.h:46:24: sparse: sparse: dereference of noderef expression
> arch/x86/include/asm/current.h:46:24: sparse: sparse: dereference of noderef expression
> arch/x86/include/asm/current.h:46:24: sparse: sparse: dereference of noderef expression
> kernel/entry/common.c: note: in included file (through arch/x86/include/asm/cpufeature.h, arch/x86/include/asm/thread_info.h, include/linux/thread_info.h, ...):
> >> arch/x86/include/asm/processor.h:522:24: sparse: sparse: dereference of noderef expression
> kernel/entry/common.c: note: in included file (through include/linux/sched.h, include/linux/context_tracking.h):
> arch/x86/include/asm/current.h:46:24: sparse: sparse: dereference of noderef expression
> arch/x86/include/asm/current.h:46:24: sparse: sparse: dereference of noderef expression
> arch/x86/include/asm/current.h:46:24: sparse: sparse: dereference of noderef expression
> arch/x86/include/asm/current.h:46:24: sparse: sparse: dereference of noderef expression
> arch/x86/include/asm/current.h:46:24: sparse: sparse: dereference of noderef expression
>
> vim +522 arch/x86/include/asm/processor.h
>
> 513
> 514 static __always_inline unsigned long current_top_of_stack(void)
> 515 {
> 516 /*
> 517 * We can't read directly from tss.sp0: sp0 on x86_32 is special in
> 518 * and around vm86 mode and sp0 on x86_64 is special because of the
> 519 * entry trampoline.
> 520 */
> 521 if (IS_ENABLED(CONFIG_USE_X86_SEG_SUPPORT))
> > 522 return pcpu_hot.top_of_stack;
> 523
> 524 return this_cpu_read_stable(pcpu_hot.top_of_stack);
> 525 }
> 526
>
> --
> 0-DAY CI Kernel Test Service
> https://github.com/intel/lkp-tests/wiki

Next message: Krzysztof Kozlowski: "Re: [PATCH] dt-bindings: clock: qcom,gcc-ipq6018: split to separate schema"
Previous message: Subhajit Ghosh: "[PATCH v2 2/2] iio: light: Add support for APDS9306 Light Sensor"
In reply to: kernel test robot: "[tip:x86/percpu 21/22] arch/x86/include/asm/processor.h:522:24: sparse: sparse: dereference of noderef expression"
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