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vdso: Address variable shadowing in macros

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Compiling the kernel with gcc12.3 W=2 results in shadowing warnings:

warning: declaration of '__pptr' shadows a previous local [-Wshadow]
  const struct { type x; } __packed *__pptr = (typeof(__pptr))(ptr);

note: in definition of macro '__put_unaligned_t'
  __pptr->x = (val);

note: in expansion of macro '__get_unaligned_t'
  __put_unaligned_t(type, __get_unaligned_t(type, src), dst);

__get_unaligned_t() and __put_unaligned_t() use a local variable named
'__pptr', which can lead to variable shadowing when these macros are used in
the same scope. This results in a -Wshadow warning during compilation.

To address this issue, rename the local variables within the macros to
ensure uniqueness.

Signed-off-by: Peng Jiang <jiang.peng9@zte.com.cn>
Signed-off-by: Shao Mingyin <shao.mingyin@zte.com.cn>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/all/20250324191230477zpGtgIRSH4mEHdtxGtgx9@zte.com.cn
This commit is contained in:
Peng Jiang 2025-03-24 19:12:30 +08:00 committed by Thomas Gleixner
parent 92e250c624
commit acea994327
1 changed files with 6 additions and 6 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

12
include/vdso/unaligned.h
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@ -2,14 +2,14 @@
#ifndef __VDSO_UNALIGNED_H #ifndef __VDSO_UNALIGNED_H
#define __VDSO_UNALIGNED_H #define __VDSO_UNALIGNED_H
#define __get_unaligned_t(type, ptr) ({ \ #define __get_unaligned_t(type, ptr) ({ \
const struct { type x; } __packed *__pptr = (typeof(__pptr))(ptr); \ const struct { type x; } __packed * __get_pptr = (typeof(__get_pptr))(ptr); \
__pptr->x; \ __get_pptr->x; \
}) })
#define __put_unaligned_t(type, val, ptr) do { \ #define __put_unaligned_t(type, val, ptr) do { \
struct { type x; } __packed *__pptr = (typeof(__pptr))(ptr); \ struct { type x; } __packed * __put_pptr = (typeof(__put_pptr))(ptr); \
__pptr->x = (val); \ __put_pptr->x = (val); \
} while (0) } while (0)
#endif /* __VDSO_UNALIGNED_H */ #endif /* __VDSO_UNALIGNED_H */