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| author |  Paul E. McKenney <paulmck@kernel.org>
| 2024-03-27 15:14:26 -0700 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@kernel.org>
| 2024-05-11 07:07:07 -0700 |
| commit | 5800e77d88c0cd98bc10460df148631afa7b5e4d (patch) | |
| tree | 62c98aa754b159ffa814a52bc10a22c89bb213ae /arch/csky | |
| parent | lib: Add one-byte emulation function (diff) | |
| download | linux-5800e77d88c0cd98bc10460df148631afa7b5e4d.tar.gz linux-5800e77d88c0cd98bc10460df148631afa7b5e4d.tar.bz2 linux-5800e77d88c0cd98bc10460df148631afa7b5e4d.zip | |
csky: Emulate one-byte cmpxchg
Use the new cmpxchg_emu_u8() to emulate one-byte cmpxchg() on csky.
[ paulmck: Apply kernel test robot feedback. ]
[ paulmck: Drop two-byte support per Arnd Bergmann feedback. ]
Co-developed-by: Yujie Liu <yujie.liu@intel.com>
Signed-off-by: Yujie Liu <yujie.liu@intel.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Tested-by: Yujie Liu <yujie.liu@intel.com>
Reviewed-by: Guo Ren <guoren@kernel.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: <linux-csky@vger.kernel.org>
Diffstat (limited to 'arch/csky')
| -rw-r--r-- | arch/csky/Kconfig | 1 | ||||
| -rw-r--r-- | arch/csky/include/asm/cmpxchg.h | 10 |
2 files changed, 11 insertions, 0 deletions
diff --git a/arch/csky/Kconfig b/arch/csky/Kconfig index d3ac36751ad1..5479707eb5d1 100644 --- a/arch/csky/Kconfig +++ b/arch/csky/Kconfig @@ -37,6 +37,7 @@ config CSKY select ARCH_INLINE_SPIN_UNLOCK_BH if !PREEMPTION select ARCH_INLINE_SPIN_UNLOCK_IRQ if !PREEMPTION select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE if !PREEMPTION + select ARCH_NEED_CMPXCHG_1_EMU select ARCH_WANT_FRAME_POINTERS if !CPU_CK610 && $(cc-option,-mbacktrace) select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT select COMMON_CLK diff --git a/arch/csky/include/asm/cmpxchg.h b/arch/csky/include/asm/cmpxchg.h index 916043b845f1..db6dda47184e 100644 --- a/arch/csky/include/asm/cmpxchg.h +++ b/arch/csky/include/asm/cmpxchg.h @@ -6,6 +6,7 @@ #ifdef CONFIG_SMP #include <linux/bug.h> #include <asm/barrier.h> +#include <linux/cmpxchg-emu.h> #define __xchg_relaxed(new, ptr, size) \ ({ \ @@ -61,6 +62,9 @@ __typeof__(old) __old = (old); \ __typeof__(*(ptr)) __ret; \ switch (size) { \ + case 1: \ + __ret = (__typeof__(*(ptr)))cmpxchg_emu_u8((volatile u8 *)__ptr, (uintptr_t)__old, (uintptr_t)__new); \ + break; \ case 4: \ asm volatile ( \ "1: ldex.w %0, (%3) \n" \ @@ -91,6 +95,9 @@ __typeof__(old) __old = (old); \ __typeof__(*(ptr)) __ret; \ switch (size) { \ + case 1: \ + __ret = (__typeof__(*(ptr)))cmpxchg_emu_u8((volatile u8 *)__ptr, (uintptr_t)__old, (uintptr_t)__new); \ + break; \ case 4: \ asm volatile ( \ "1: ldex.w %0, (%3) \n" \ @@ -122,6 +129,9 @@ __typeof__(old) __old = (old); \ __typeof__(*(ptr)) __ret; \ switch (size) { \ + case 1: \ + __ret = (__typeof__(*(ptr)))cmpxchg_emu_u8((volatile u8 *)__ptr, (uintptr_t)__old, (uintptr_t)__new); \ + break; \ case 4: \ asm volatile ( \ RELEASE_FENCE \ |