* [PATCH] locking/arch: Avoid variable shadowing in local_try_cmpxchg()
@ 2023-05-17 15:09 Uros Bizjak
0 siblings, 0 replies; only message in thread
From: Uros Bizjak @ 2023-05-17 15:09 UTC (permalink / raw)
To: loongarch, linux-mips, x86, linux-arch, linux-kernel
Cc: Uros Bizjak, Charlemagne Lasse, Huacai Chen, WANG Xuerui,
Jiaxun Yang, Jun Yi, Thomas Bogendoerfer, Thomas Gleixner,
Ingo Molnar, Borislav Petkov, Dave Hansen, H. Peter Anvin
Several architectures define arch_try_local_cmpxchg macro using
internal temporary variables named __old or _old. Uglify equally
named variable in local_try_cmpxchg() with additional underscore
to avoid variable shadowing warning.
Fixes: d994f2c8e241 ("locking/arch: Wire up local_try_cmpxchg()")
Reported-by: Charlemagne Lasse <charlemagnelasse@gmail.com>
Closes: https://lore.kernel.org/lkml/CAFGhKbyxtuk=LoW-E3yLXgcmR93m+Dfo5-u9oQA_YC5Fcy_t9g@mail.gmail.com/
Cc: Huacai Chen <chenhuacai@kernel.org>
Cc: WANG Xuerui <kernel@xen0n.name>
Cc: Jiaxun Yang <jiaxun.yang@flygoat.com>
Cc: Jun Yi <yijun@loongson.cn>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
---
arch/loongarch/include/asm/local.h | 4 ++--
arch/mips/include/asm/local.h | 4 ++--
arch/x86/include/asm/local.h | 4 ++--
3 files changed, 6 insertions(+), 6 deletions(-)
diff --git a/arch/loongarch/include/asm/local.h b/arch/loongarch/include/asm/local.h
index 83e995b30e47..4c6e4ed23433 100644
--- a/arch/loongarch/include/asm/local.h
+++ b/arch/loongarch/include/asm/local.h
@@ -63,8 +63,8 @@ static inline long local_cmpxchg(local_t *l, long old, long new)
static inline bool local_try_cmpxchg(local_t *l, long *old, long new)
{
- typeof(l->a.counter) *__old = (typeof(l->a.counter) *) old;
- return try_cmpxchg_local(&l->a.counter, __old, new);
+ typeof(l->a.counter) *___old = (typeof(l->a.counter) *) old;
+ return try_cmpxchg_local(&l->a.counter, ___old, new);
}
#define local_xchg(l, n) (atomic_long_xchg((&(l)->a), (n)))
diff --git a/arch/mips/include/asm/local.h b/arch/mips/include/asm/local.h
index 5daf6fe8e3e9..de276e2ebb64 100644
--- a/arch/mips/include/asm/local.h
+++ b/arch/mips/include/asm/local.h
@@ -101,8 +101,8 @@ static __inline__ long local_cmpxchg(local_t *l, long old, long new)
static __inline__ bool local_try_cmpxchg(local_t *l, long *old, long new)
{
- typeof(l->a.counter) *__old = (typeof(l->a.counter) *) old;
- return try_cmpxchg_local(&l->a.counter, __old, new);
+ typeof(l->a.counter) *___old = (typeof(l->a.counter) *) old;
+ return try_cmpxchg_local(&l->a.counter, ___old, new);
}
#define local_xchg(l, n) (atomic_long_xchg((&(l)->a), (n)))
diff --git a/arch/x86/include/asm/local.h b/arch/x86/include/asm/local.h
index 56d4ef604b91..36cf5ca83ccb 100644
--- a/arch/x86/include/asm/local.h
+++ b/arch/x86/include/asm/local.h
@@ -127,8 +127,8 @@ static inline long local_cmpxchg(local_t *l, long old, long new)
static inline bool local_try_cmpxchg(local_t *l, long *old, long new)
{
- typeof(l->a.counter) *__old = (typeof(l->a.counter) *) old;
- return try_cmpxchg_local(&l->a.counter, __old, new);
+ typeof(l->a.counter) *___old = (typeof(l->a.counter) *) old;
+ return try_cmpxchg_local(&l->a.counter, ___old, new);
}
/* Always has a lock prefix */
--
2.40.1
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