| Message ID | 20231104091615.4884-5-wuqiang.matt@bytedance.com (mailing list archive) |
|---|---|
| State | Handled Elsewhere |
| Headers | show |
| Series | locking/atomic: arch_cmpxchg[64]_local undefined | expand |
On Sat, 4 Nov 2023 17:16:15 +0800 "wuqiang.matt" <wuqiang.matt@bytedance.com> wrote: > For architectures that support native cmpxchg, we'd like to > implement arch_cmpxchg[64]_local with the native variants of > supported data size. If not, the generci_cmpxchg[64]_local > will be used. > > Reported-by: kernel test robot <lkp@intel.com> > Closes: https://lore.kernel.org/oe-kbuild-all/202310272207.tLPflya4-lkp@intel.com/ > Looks good to me. Reviewed-by: Masami Hiramatsu (Google) <mhiramat@kernel.org> But I need hexagon's maintainer's comment too. Thank you, > Signed-off-by: wuqiang.matt <wuqiang.matt@bytedance.com> > --- > arch/hexagon/include/asm/cmpxchg.h | 51 +++++++++++++++++++++++++++++- > 1 file changed, 50 insertions(+), 1 deletion(-) > > diff --git a/arch/hexagon/include/asm/cmpxchg.h b/arch/hexagon/include/asm/cmpxchg.h > index bf6cf5579cf4..2b5e5bbaf807 100644 > --- a/arch/hexagon/include/asm/cmpxchg.h > +++ b/arch/hexagon/include/asm/cmpxchg.h > @@ -8,6 +8,8 @@ > #ifndef _ASM_CMPXCHG_H > #define _ASM_CMPXCHG_H > > +#include <linux/build_bug.h> > + > /* > * __arch_xchg - atomically exchange a register and a memory location > * @x: value to swap > @@ -51,13 +53,15 @@ __arch_xchg(unsigned long x, volatile void *ptr, int size) > * variable casting. > */ > > -#define arch_cmpxchg(ptr, old, new) \ > +#define __cmpxchg_32(ptr, old, new) \ > ({ \ > __typeof__(ptr) __ptr = (ptr); \ > __typeof__(*(ptr)) __old = (old); \ > __typeof__(*(ptr)) __new = (new); \ > __typeof__(*(ptr)) __oldval = 0; \ > \ > + BUILD_BUG_ON(sizeof(*(ptr)) != 4); \ > + \ > asm volatile( \ > "1: %0 = memw_locked(%1);\n" \ > " { P0 = cmp.eq(%0,%2);\n" \ > @@ -72,4 +76,49 @@ __arch_xchg(unsigned long x, volatile void *ptr, int size) > __oldval; \ > }) > > +#define __cmpxchg(ptr, old, val, size) \ > +({ \ > + __typeof__(*(ptr)) oldval; \ > + \ > + switch (size) { \ > + case 4: \ > + oldval = __cmpxchg_32(ptr, old, val); \ > + break; \ > + default: \ > + BUILD_BUG(); \ > + oldval = val; \ > + break; \ > + } \ > + \ > + oldval; \ > +}) > + > +#define arch_cmpxchg(ptr, o, n) __cmpxchg((ptr), (o), (n), sizeof(*(ptr))) > + > +/* > + * always make arch_cmpxchg[64]_local available, native cmpxchg > + * will be used if available, then generic_cmpxchg[64]_local > + */ > +#include <asm-generic/cmpxchg-local.h> > + > +#define arch_cmpxchg_local(ptr, old, val) \ > +({ \ > + __typeof__(*(ptr)) retval; \ > + int size = sizeof(*(ptr)); \ > + \ > + switch (size) { \ > + case 4: \ > + retval = __cmpxchg_32(ptr, old, val); \ > + break; \ > + default: \ > + retval = __generic_cmpxchg_local(ptr, old, \ > + val, size); \ > + break; \ > + } \ > + \ > + retval; \ > +}) > + > +#define arch_cmpxchg64_local(ptr, o, n) __generic_cmpxchg64_local((ptr), (o), (n)) > + > #endif /* _ASM_CMPXCHG_H */ > -- > 2.40.1 >
diff --git a/arch/hexagon/include/asm/cmpxchg.h b/arch/hexagon/include/asm/cmpxchg.h index bf6cf5579cf4..2b5e5bbaf807 100644 --- a/arch/hexagon/include/asm/cmpxchg.h +++ b/arch/hexagon/include/asm/cmpxchg.h @@ -8,6 +8,8 @@ #ifndef _ASM_CMPXCHG_H #define _ASM_CMPXCHG_H +#include <linux/build_bug.h> + /* * __arch_xchg - atomically exchange a register and a memory location * @x: value to swap @@ -51,13 +53,15 @@ __arch_xchg(unsigned long x, volatile void *ptr, int size) * variable casting. */ -#define arch_cmpxchg(ptr, old, new) \ +#define __cmpxchg_32(ptr, old, new) \ ({ \ __typeof__(ptr) __ptr = (ptr); \ __typeof__(*(ptr)) __old = (old); \ __typeof__(*(ptr)) __new = (new); \ __typeof__(*(ptr)) __oldval = 0; \ \ + BUILD_BUG_ON(sizeof(*(ptr)) != 4); \ + \ asm volatile( \ "1: %0 = memw_locked(%1);\n" \ " { P0 = cmp.eq(%0,%2);\n" \ @@ -72,4 +76,49 @@ __arch_xchg(unsigned long x, volatile void *ptr, int size) __oldval; \ }) +#define __cmpxchg(ptr, old, val, size) \ +({ \ + __typeof__(*(ptr)) oldval; \ + \ + switch (size) { \ + case 4: \ + oldval = __cmpxchg_32(ptr, old, val); \ + break; \ + default: \ + BUILD_BUG(); \ + oldval = val; \ + break; \ + } \ + \ + oldval; \ +}) + +#define arch_cmpxchg(ptr, o, n) __cmpxchg((ptr), (o), (n), sizeof(*(ptr))) + +/* + * always make arch_cmpxchg[64]_local available, native cmpxchg + * will be used if available, then generic_cmpxchg[64]_local + */ +#include <asm-generic/cmpxchg-local.h> + +#define arch_cmpxchg_local(ptr, old, val) \ +({ \ + __typeof__(*(ptr)) retval; \ + int size = sizeof(*(ptr)); \ + \ + switch (size) { \ + case 4: \ + retval = __cmpxchg_32(ptr, old, val); \ + break; \ + default: \ + retval = __generic_cmpxchg_local(ptr, old, \ + val, size); \ + break; \ + } \ + \ + retval; \ +}) + +#define arch_cmpxchg64_local(ptr, o, n) __generic_cmpxchg64_local((ptr), (o), (n)) + #endif /* _ASM_CMPXCHG_H */
For architectures that support native cmpxchg, we'd like to implement arch_cmpxchg[64]_local with the native variants of supported data size. If not, the generci_cmpxchg[64]_local will be used. Reported-by: kernel test robot <lkp@intel.com> Closes: https://lore.kernel.org/oe-kbuild-all/202310272207.tLPflya4-lkp@intel.com/ Signed-off-by: wuqiang.matt <wuqiang.matt@bytedance.com> --- arch/hexagon/include/asm/cmpxchg.h | 51 +++++++++++++++++++++++++++++- 1 file changed, 50 insertions(+), 1 deletion(-)