Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
x86/percpu: Make CONFIG_USE_X86_SEG_SUPPORT work with sparse
Now that sparse builds enforce the usage of typeof_unqual() the casts in
__raw_cpu_read/write() cause sparse to emit tons of false postive
warnings:
warning: cast removes address space '__percpu' of expression
Address this by annotating the casts with __force.
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Link: https://patch.msgid.link/87v7gz0yjv.ffs@tglx
Closes: https://lore.kernel.org/oe-kbuild-all/202601181733.YZOf9XU3-lkp@intel.com/
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arch/x86/include/asm/percpu.h
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arch/x86/include/asm/percpu.h
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#define __raw_cpu_read(size, qual, pcp) \
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({ \
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-
*(qual __my_cpu_type(pcp) *)__my_cpu_ptr(&(pcp)); \
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+
*(qual __my_cpu_type(pcp) * __force)__my_cpu_ptr(&(pcp)); \
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})
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-
#define __raw_cpu_write(size, qual, pcp, val) \
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-
do { \
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*(qual __my_cpu_type(pcp) *)__my_cpu_ptr(&(pcp)) = (val); \
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+
#define __raw_cpu_write(size, qual, pcp, val) \
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do { \
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*(qual __my_cpu_type(pcp) * __force)__my_cpu_ptr(&(pcp)) = (val); \
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} while (0)
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#define __raw_cpu_read_const(pcp) __raw_cpu_read(, , pcp)