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x86/percpu: Declare const_pcpu_hot as extern const variable

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const_pcpu_hot is aliased by linker to pcpu_hot, so there is no need
to use the DECLARE_PER_CPU_ALIGNED() macro. Also, declare const_pcpu_hot
as extern to avoid allocating storage space for the aliased structure.

Fixes: ed2f752e0e ("x86/percpu: Introduce const-qualified const_pcpu_hot to micro-optimize code generation")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20231130162949.83518-1-ubizjak@gmail.com
Closes: https://lore.kernel.org/oe-kbuild-all/202311302257.tSFtZnly-lkp@intel.com/
This commit is contained in:
Uros Bizjak 2023-11-30 17:27:35 +01:00 committed by Ingo Molnar
parent 6724ba89e0
commit 4604c052b8
1 changed files with 1 additions and 2 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

3
arch/x86/include/asm/current.h
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@ -37,8 +37,7 @@ static_assert(sizeof(struct pcpu_hot) == 64);
DECLARE_PER_CPU_ALIGNED(struct pcpu_hot, pcpu_hot); DECLARE_PER_CPU_ALIGNED(struct pcpu_hot, pcpu_hot);
/* const-qualified alias to pcpu_hot, aliased by linker. */ /* const-qualified alias to pcpu_hot, aliased by linker. */
DECLARE_PER_CPU_ALIGNED(const struct pcpu_hot __percpu_seg_override, extern const struct pcpu_hot __percpu_seg_override const_pcpu_hot;
const_pcpu_hot);
static __always_inline struct task_struct *get_current(void) static __always_inline struct task_struct *get_current(void)
{ {