* [PATCH] cmpxchg: allow const-qualified old value in cmpxchg()
@ 2026-04-02 6:56 Hangbin Liu
2026-04-02 8:57 ` David Laight
2026-04-02 10:47 ` Peter Zijlstra
0 siblings, 2 replies; 4+ messages in thread
From: Hangbin Liu @ 2026-04-02 6:56 UTC (permalink / raw)
To: Richard Henderson, Matt Turner, Magnus Lindholm, Vineet Gupta,
Brian Cain, James E.J. Bottomley, Helge Deller,
Madhavan Srinivasan, Michael Ellerman, Nicholas Piggin,
Christophe Leroy (CS GROUP), Paul Walmsley, Palmer Dabbelt,
Albert Ou, Alexandre Ghiti, Yoshinori Sato, Rich Felker,
John Paul Adrian Glaubitz, David S. Miller, Andreas Larsson,
Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen, x86,
H. Peter Anvin, Chris Zankel, Max Filippov
Cc: linux-alpha, linux-kernel, linux-snps-arc, linux-hexagon,
linux-parisc, linuxppc-dev, linux-riscv, linux-sh, sparclinux,
Jakub Kicinski, Hangbin Liu
The old value passed to cmpxchg() is semantically read-only: it is
only loaded into a register as a comparand and is never written back.
However, the macro currently assigns it implicitly to a local variable
of type __typeof__(*(ptr)), which triggers -Werror=discarded-qualifiers
when old is a const-qualified pointer and ptr points to a non-const type.
To avoid this, let's add an explicit cast to __typeof__(*(ptr)) for the
old local variable in the cmpxchg macros. This explicit cast suppresses
the -Wdiscarded-qualifiers diagnostic.
The new value is intentionally left without a cast: new will be stored
into *ptr, so silently accepting a const-qualified new would allow
callers to store a pointer-to-const into a non-const location without
any compiler warning.
Suggested-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
---
This is my first time posting a patch with multi-architecture specific
changes, so I'm not sure which target repository I should use. Please
correct me if I made any mistakes.
---
arch/alpha/include/asm/cmpxchg.h | 4 ++--
arch/arc/include/asm/cmpxchg.h | 4 ++--
arch/hexagon/include/asm/cmpxchg.h | 2 +-
arch/parisc/include/asm/cmpxchg.h | 2 +-
arch/powerpc/include/asm/cmpxchg.h | 8 ++++----
arch/riscv/include/asm/cmpxchg.h | 4 ++--
arch/sh/include/asm/cmpxchg.h | 2 +-
arch/sparc/include/asm/cmpxchg_32.h | 2 +-
arch/sparc/include/asm/cmpxchg_64.h | 2 +-
arch/x86/include/asm/cmpxchg.h | 2 +-
arch/xtensa/include/asm/cmpxchg.h | 2 +-
tools/arch/x86/include/asm/cmpxchg.h | 2 +-
12 files changed, 18 insertions(+), 18 deletions(-)
diff --git a/arch/alpha/include/asm/cmpxchg.h b/arch/alpha/include/asm/cmpxchg.h
index ae1b96479d0c..b4b8dac759c4 100644
--- a/arch/alpha/include/asm/cmpxchg.h
+++ b/arch/alpha/include/asm/cmpxchg.h
@@ -234,7 +234,7 @@ ____cmpxchg(volatile void *ptr, unsigned long old, unsigned long new,
#define arch_cmpxchg_local(ptr, o, n) \
({ \
- __typeof__(*(ptr)) _o_ = (o); \
+ __typeof__(*(ptr)) _o_ = (__typeof__(*(ptr)))(o); \
__typeof__(*(ptr)) _n_ = (n); \
(__typeof__(*(ptr))) ____cmpxchg((ptr), (unsigned long)_o_, \
(unsigned long)_n_, \
@@ -265,7 +265,7 @@ ____cmpxchg(volatile void *ptr, unsigned long old, unsigned long new,
#define arch_cmpxchg(ptr, o, n) \
({ \
__typeof__(*(ptr)) __ret; \
- __typeof__(*(ptr)) _o_ = (o); \
+ __typeof__(*(ptr)) _o_ = (__typeof__(*(ptr)))(o); \
__typeof__(*(ptr)) _n_ = (n); \
smp_mb(); \
__ret = (__typeof__(*(ptr))) ____cmpxchg((ptr), \
diff --git a/arch/arc/include/asm/cmpxchg.h b/arch/arc/include/asm/cmpxchg.h
index 76f43db0890f..9637e2cdb5b1 100644
--- a/arch/arc/include/asm/cmpxchg.h
+++ b/arch/arc/include/asm/cmpxchg.h
@@ -42,7 +42,7 @@
#define arch_cmpxchg_relaxed(ptr, old, new) \
({ \
__typeof__(ptr) _p_ = (ptr); \
- __typeof__(*(ptr)) _o_ = (old); \
+ __typeof__(*(ptr)) _o_ = (__typeof__(*(ptr)))(old); \
__typeof__(*(ptr)) _n_ = (new); \
__typeof__(*(ptr)) _prev_; \
\
@@ -64,7 +64,7 @@
#define arch_cmpxchg(ptr, old, new) \
({ \
volatile __typeof__(ptr) _p_ = (ptr); \
- __typeof__(*(ptr)) _o_ = (old); \
+ __typeof__(*(ptr)) _o_ = (__typeof__(*(ptr)))(old); \
__typeof__(*(ptr)) _n_ = (new); \
__typeof__(*(ptr)) _prev_; \
unsigned long __flags; \
diff --git a/arch/hexagon/include/asm/cmpxchg.h b/arch/hexagon/include/asm/cmpxchg.h
index 9c58fb81f7fd..7e117964cb6b 100644
--- a/arch/hexagon/include/asm/cmpxchg.h
+++ b/arch/hexagon/include/asm/cmpxchg.h
@@ -54,7 +54,7 @@ __arch_xchg(unsigned long x, volatile void *ptr, int size)
#define arch_cmpxchg(ptr, old, new) \
({ \
__typeof__(ptr) __ptr = (ptr); \
- __typeof__(*(ptr)) __old = (old); \
+ __typeof__(*(ptr)) __old = (__typeof__(*(ptr)))(old); \
__typeof__(*(ptr)) __new = (new); \
__typeof__(*(ptr)) __oldval = (__typeof__(*(ptr))) 0; \
\
diff --git a/arch/parisc/include/asm/cmpxchg.h b/arch/parisc/include/asm/cmpxchg.h
index bf0a0f1189eb..2a87942227f8 100644
--- a/arch/parisc/include/asm/cmpxchg.h
+++ b/arch/parisc/include/asm/cmpxchg.h
@@ -78,7 +78,7 @@ __cmpxchg(volatile void *ptr, unsigned long old, unsigned long new_, int size)
#define arch_cmpxchg(ptr, o, n) \
({ \
- __typeof__(*(ptr)) _o_ = (o); \
+ __typeof__(*(ptr)) _o_ = (__typeof__(*(ptr)))(o); \
__typeof__(*(ptr)) _n_ = (n); \
(__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_, \
(unsigned long)_n_, sizeof(*(ptr))); \
diff --git a/arch/powerpc/include/asm/cmpxchg.h b/arch/powerpc/include/asm/cmpxchg.h
index dbb50c06f0bf..36d113b13623 100644
--- a/arch/powerpc/include/asm/cmpxchg.h
+++ b/arch/powerpc/include/asm/cmpxchg.h
@@ -698,7 +698,7 @@ __cmpxchg_acquire(void *ptr, unsigned long old, unsigned long new,
}
#define arch_cmpxchg(ptr, o, n) \
({ \
- __typeof__(*(ptr)) _o_ = (o); \
+ __typeof__(*(ptr)) _o_ = (__typeof__(*(ptr)))(o); \
__typeof__(*(ptr)) _n_ = (n); \
(__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_, \
(unsigned long)_n_, sizeof(*(ptr))); \
@@ -707,7 +707,7 @@ __cmpxchg_acquire(void *ptr, unsigned long old, unsigned long new,
#define arch_cmpxchg_local(ptr, o, n) \
({ \
- __typeof__(*(ptr)) _o_ = (o); \
+ __typeof__(*(ptr)) _o_ = (__typeof__(*(ptr)))(o); \
__typeof__(*(ptr)) _n_ = (n); \
(__typeof__(*(ptr))) __cmpxchg_local((ptr), (unsigned long)_o_, \
(unsigned long)_n_, sizeof(*(ptr))); \
@@ -715,7 +715,7 @@ __cmpxchg_acquire(void *ptr, unsigned long old, unsigned long new,
#define arch_cmpxchg_relaxed(ptr, o, n) \
({ \
- __typeof__(*(ptr)) _o_ = (o); \
+ __typeof__(*(ptr)) _o_ = (__typeof__(*(ptr)))(o); \
__typeof__(*(ptr)) _n_ = (n); \
(__typeof__(*(ptr))) __cmpxchg_relaxed((ptr), \
(unsigned long)_o_, (unsigned long)_n_, \
@@ -724,7 +724,7 @@ __cmpxchg_acquire(void *ptr, unsigned long old, unsigned long new,
#define arch_cmpxchg_acquire(ptr, o, n) \
({ \
- __typeof__(*(ptr)) _o_ = (o); \
+ __typeof__(*(ptr)) _o_ = (__typeof__(*(ptr)))(o); \
__typeof__(*(ptr)) _n_ = (n); \
(__typeof__(*(ptr))) __cmpxchg_acquire((ptr), \
(unsigned long)_o_, (unsigned long)_n_, \
diff --git a/arch/riscv/include/asm/cmpxchg.h b/arch/riscv/include/asm/cmpxchg.h
index 8712cf9c69dc..3026a9ff43c4 100644
--- a/arch/riscv/include/asm/cmpxchg.h
+++ b/arch/riscv/include/asm/cmpxchg.h
@@ -215,7 +215,7 @@
cas_prepend, cas_append) \
({ \
__typeof__(ptr) __ptr = (ptr); \
- __typeof__(*(__ptr)) __old = (old); \
+ __typeof__(*(__ptr)) __old = (__typeof__(*(__ptr)))(old); \
__typeof__(*(__ptr)) __new = (new); \
__typeof__(*(__ptr)) __ret; \
\
@@ -331,7 +331,7 @@ union __u128_halves {
#define __arch_cmpxchg128(p, o, n, cas_sfx) \
({ \
- __typeof__(*(p)) __o = (o); \
+ __typeof__(*(p)) __o = (__typeof__(*(p)))(o); \
union __u128_halves __hn = { .full = (n) }; \
union __u128_halves __ho = { .full = (__o) }; \
register unsigned long t1 asm ("t1") = __hn.low; \
diff --git a/arch/sh/include/asm/cmpxchg.h b/arch/sh/include/asm/cmpxchg.h
index 1e5dc5ccf7bf..7fb9214d246f 100644
--- a/arch/sh/include/asm/cmpxchg.h
+++ b/arch/sh/include/asm/cmpxchg.h
@@ -68,7 +68,7 @@ static inline unsigned long __cmpxchg(volatile void * ptr, unsigned long old,
#define arch_cmpxchg(ptr,o,n) \
({ \
- __typeof__(*(ptr)) _o_ = (o); \
+ __typeof__(*(ptr)) _o_ = (__typeof__(*(ptr)))(o); \
__typeof__(*(ptr)) _n_ = (n); \
(__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_, \
(unsigned long)_n_, sizeof(*(ptr))); \
diff --git a/arch/sparc/include/asm/cmpxchg_32.h b/arch/sparc/include/asm/cmpxchg_32.h
index 8c1a3ca34eeb..f733bd5b5d3b 100644
--- a/arch/sparc/include/asm/cmpxchg_32.h
+++ b/arch/sparc/include/asm/cmpxchg_32.h
@@ -55,7 +55,7 @@ __cmpxchg(volatile void *ptr, unsigned long old, unsigned long new_, int size)
#define arch_cmpxchg(ptr, o, n) \
({ \
- __typeof__(*(ptr)) _o_ = (o); \
+ __typeof__(*(ptr)) _o_ = (__typeof__(*(ptr)))(o); \
__typeof__(*(ptr)) _n_ = (n); \
(__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_, \
(unsigned long)_n_, sizeof(*(ptr))); \
diff --git a/arch/sparc/include/asm/cmpxchg_64.h b/arch/sparc/include/asm/cmpxchg_64.h
index 3de25262c411..4a9ccf80487a 100644
--- a/arch/sparc/include/asm/cmpxchg_64.h
+++ b/arch/sparc/include/asm/cmpxchg_64.h
@@ -170,7 +170,7 @@ __cmpxchg(volatile void *ptr, unsigned long old, unsigned long new, int size)
#define arch_cmpxchg(ptr,o,n) \
({ \
- __typeof__(*(ptr)) _o_ = (o); \
+ __typeof__(*(ptr)) _o_ = (__typeof__(*(ptr)))(o); \
__typeof__(*(ptr)) _n_ = (n); \
(__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_, \
(unsigned long)_n_, sizeof(*(ptr))); \
diff --git a/arch/x86/include/asm/cmpxchg.h b/arch/x86/include/asm/cmpxchg.h
index a88b06f1c35e..a7984842c58a 100644
--- a/arch/x86/include/asm/cmpxchg.h
+++ b/arch/x86/include/asm/cmpxchg.h
@@ -85,7 +85,7 @@ extern void __add_wrong_size(void)
#define __raw_cmpxchg(ptr, old, new, size, lock) \
({ \
__typeof__(*(ptr)) __ret; \
- __typeof__(*(ptr)) __old = (old); \
+ __typeof__(*(ptr)) __old = (__typeof__(*(ptr)))(old); \
__typeof__(*(ptr)) __new = (new); \
switch (size) { \
case __X86_CASE_B: \
diff --git a/arch/xtensa/include/asm/cmpxchg.h b/arch/xtensa/include/asm/cmpxchg.h
index b6db4838b175..0f68eddb6d2d 100644
--- a/arch/xtensa/include/asm/cmpxchg.h
+++ b/arch/xtensa/include/asm/cmpxchg.h
@@ -83,7 +83,7 @@ __cmpxchg(volatile void *ptr, unsigned long old, unsigned long new, int size)
}
#define arch_cmpxchg(ptr,o,n) \
- ({ __typeof__(*(ptr)) _o_ = (o); \
+ ({ __typeof__(*(ptr)) _o_ = (__typeof__(*(ptr)))(o); \
__typeof__(*(ptr)) _n_ = (n); \
(__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_, \
(unsigned long)_n_, sizeof (*(ptr))); \
diff --git a/tools/arch/x86/include/asm/cmpxchg.h b/tools/arch/x86/include/asm/cmpxchg.h
index 0ed9ca2766ad..b71938db9422 100644
--- a/tools/arch/x86/include/asm/cmpxchg.h
+++ b/tools/arch/x86/include/asm/cmpxchg.h
@@ -35,7 +35,7 @@ extern void __cmpxchg_wrong_size(void)
#define __raw_cmpxchg(ptr, old, new, size, lock) \
({ \
__typeof__(*(ptr)) __ret; \
- __typeof__(*(ptr)) __old = (old); \
+ __typeof__(*(ptr)) __old = (__typeof__(*(ptr)))(old); \
__typeof__(*(ptr)) __new = (new); \
switch (size) { \
case __X86_CASE_B: \
---
base-commit: 48b3cd69265f346f64b93064723492da46206e9b
change-id: 20260402-cmpxchg-2fd307f44a41
Best regards,
--
Hangbin Liu <liuhangbin@gmail.com>
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH] cmpxchg: allow const-qualified old value in cmpxchg()
2026-04-02 6:56 [PATCH] cmpxchg: allow const-qualified old value in cmpxchg() Hangbin Liu
@ 2026-04-02 8:57 ` David Laight
2026-04-02 13:07 ` Hangbin Liu
2026-04-02 10:47 ` Peter Zijlstra
1 sibling, 1 reply; 4+ messages in thread
From: David Laight @ 2026-04-02 8:57 UTC (permalink / raw)
To: Hangbin Liu
Cc: Richard Henderson, Matt Turner, Magnus Lindholm, Vineet Gupta,
Brian Cain, James E.J. Bottomley, Helge Deller,
Madhavan Srinivasan, Michael Ellerman, Nicholas Piggin,
Christophe Leroy (CS GROUP), Paul Walmsley, Palmer Dabbelt,
Albert Ou, Alexandre Ghiti, Yoshinori Sato, Rich Felker,
John Paul Adrian Glaubitz, David S. Miller, Andreas Larsson,
Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen, x86,
H. Peter Anvin, Chris Zankel, Max Filippov, linux-alpha,
linux-kernel, linux-snps-arc, linux-hexagon, linux-parisc,
linuxppc-dev, linux-riscv, linux-sh, sparclinux, Jakub Kicinski
On Thu, 02 Apr 2026 14:56:01 +0800
Hangbin Liu <liuhangbin@gmail.com> wrote:
> The old value passed to cmpxchg() is semantically read-only: it is
> only loaded into a register as a comparand and is never written back.
> However, the macro currently assigns it implicitly to a local variable
> of type __typeof__(*(ptr)), which triggers -Werror=discarded-qualifiers
> when old is a const-qualified pointer and ptr points to a non-const type.
>
> To avoid this, let's add an explicit cast to __typeof__(*(ptr)) for the
> old local variable in the cmpxchg macros. This explicit cast suppresses
> the -Wdiscarded-qualifiers diagnostic.
>
> The new value is intentionally left without a cast: new will be stored
> into *ptr, so silently accepting a const-qualified new would allow
> callers to store a pointer-to-const into a non-const location without
> any compiler warning.
>
> Suggested-by: Jakub Kicinski <kuba@kernel.org>
> Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
...
>
> diff --git a/arch/alpha/include/asm/cmpxchg.h b/arch/alpha/include/asm/cmpxchg.h
> index ae1b96479d0c..b4b8dac759c4 100644
> --- a/arch/alpha/include/asm/cmpxchg.h
> +++ b/arch/alpha/include/asm/cmpxchg.h
> @@ -234,7 +234,7 @@ ____cmpxchg(volatile void *ptr, unsigned long old, unsigned long new,
>
> #define arch_cmpxchg_local(ptr, o, n) \
> ({ \
> - __typeof__(*(ptr)) _o_ = (o); \
> + __typeof__(*(ptr)) _o_ = (__typeof__(*(ptr)))(o); \
> __typeof__(*(ptr)) _n_ = (n); \
> (__typeof__(*(ptr))) ____cmpxchg((ptr), (unsigned long)_o_, \
> (unsigned long)_n_, \
That looks like it loses the check that 'o' has the same type as '*ptr'.
Maybe this works?
auto _o_ = 1 ? (o) : *(ptr);
David
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] cmpxchg: allow const-qualified old value in cmpxchg()
2026-04-02 6:56 [PATCH] cmpxchg: allow const-qualified old value in cmpxchg() Hangbin Liu
2026-04-02 8:57 ` David Laight
@ 2026-04-02 10:47 ` Peter Zijlstra
1 sibling, 0 replies; 4+ messages in thread
From: Peter Zijlstra @ 2026-04-02 10:47 UTC (permalink / raw)
To: Hangbin Liu
Cc: Richard Henderson, Matt Turner, Magnus Lindholm, Vineet Gupta,
Brian Cain, James E.J. Bottomley, Helge Deller,
Madhavan Srinivasan, Michael Ellerman, Nicholas Piggin,
Christophe Leroy (CS GROUP), Paul Walmsley, Palmer Dabbelt,
Albert Ou, Alexandre Ghiti, Yoshinori Sato, Rich Felker,
John Paul Adrian Glaubitz, David S. Miller, Andreas Larsson,
Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen, x86,
H. Peter Anvin, Chris Zankel, Max Filippov, linux-alpha,
linux-kernel, linux-snps-arc, linux-hexagon, linux-parisc,
linuxppc-dev, linux-riscv, linux-sh, sparclinux, Jakub Kicinski
On Thu, Apr 02, 2026 at 02:56:01PM +0800, Hangbin Liu wrote:
> The old value passed to cmpxchg() is semantically read-only: it is
> only loaded into a register as a comparand and is never written back.
> However, the macro currently assigns it implicitly to a local variable
> of type __typeof__(*(ptr)), which triggers -Werror=discarded-qualifiers
> when old is a const-qualified pointer and ptr points to a non-const type.
>
> To avoid this, let's add an explicit cast to __typeof__(*(ptr)) for the
> old local variable in the cmpxchg macros. This explicit cast suppresses
> the -Wdiscarded-qualifiers diagnostic.
>
> The new value is intentionally left without a cast: new will be stored
> into *ptr, so silently accepting a const-qualified new would allow
> callers to store a pointer-to-const into a non-const location without
> any compiler warning.
>
> Suggested-by: Jakub Kicinski <kuba@kernel.org>
> Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
> ---
Where is this a problem? I've never seen this. Also, new code should
probably use try_cmpxchg() anyway.
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] cmpxchg: allow const-qualified old value in cmpxchg()
2026-04-02 8:57 ` David Laight
@ 2026-04-02 13:07 ` Hangbin Liu
0 siblings, 0 replies; 4+ messages in thread
From: Hangbin Liu @ 2026-04-02 13:07 UTC (permalink / raw)
To: David Laight
Cc: Richard Henderson, Matt Turner, Magnus Lindholm, Vineet Gupta,
Brian Cain, James E.J. Bottomley, Helge Deller,
Madhavan Srinivasan, Michael Ellerman, Nicholas Piggin,
Christophe Leroy (CS GROUP), Paul Walmsley, Palmer Dabbelt,
Albert Ou, Alexandre Ghiti, Yoshinori Sato, Rich Felker,
John Paul Adrian Glaubitz, David S. Miller, Andreas Larsson,
Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen, x86,
H. Peter Anvin, Chris Zankel, Max Filippov, linux-alpha,
linux-kernel, linux-snps-arc, linux-hexagon, linux-parisc,
linuxppc-dev, linux-riscv, linux-sh, sparclinux, Jakub Kicinski
On Thu, Apr 02, 2026 at 09:57:47AM +0100, David Laight wrote:
> > diff --git a/arch/alpha/include/asm/cmpxchg.h b/arch/alpha/include/asm/cmpxchg.h
> > index ae1b96479d0c..b4b8dac759c4 100644
> > --- a/arch/alpha/include/asm/cmpxchg.h
> > +++ b/arch/alpha/include/asm/cmpxchg.h
> > @@ -234,7 +234,7 @@ ____cmpxchg(volatile void *ptr, unsigned long old, unsigned long new,
> >
> > #define arch_cmpxchg_local(ptr, o, n) \
> > ({ \
> > - __typeof__(*(ptr)) _o_ = (o); \
> > + __typeof__(*(ptr)) _o_ = (__typeof__(*(ptr)))(o); \
> > __typeof__(*(ptr)) _n_ = (n); \
> > (__typeof__(*(ptr))) ____cmpxchg((ptr), (unsigned long)_o_, \
> > (unsigned long)_n_, \
>
> That looks like it loses the check that 'o' has the same type as '*ptr'.
> Maybe this works?
> auto _o_ = 1 ? (o) : *(ptr);
>
Oh, I didn't notice this. Thanks for the comment!
Best Regards
Hangbin
^ permalink raw reply [flat|nested] 4+ messages in thread
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