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| author | Paul E. McKenney <paulmck@kernel.org> | 2024-03-28 01:28:04 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-11-14 15:21:15 +0300 |
| commit | 3cf5406d6c49e1116b0e0ec2040bb199c9ff1ba6 (patch) | |
| tree | 326d4c203d05011eeab656f6873ac73c95e37ae1 /arch | |
| parent | ac499b4f604bdc4e771c9b4303c40287fd1e1e67 (diff) | |
| download | linux-3cf5406d6c49e1116b0e0ec2040bb199c9ff1ba6.tar.xz | |
xtensa: Emulate one-byte cmpxchg
commit e799bef0d9c85b963938d8f31806a898385a5b09 upstream.
Use the new cmpxchg_emu_u8() to emulate one-byte cmpxchg() on xtensa.
[ paulmck: Apply kernel test robot feedback. ]
[ paulmck: Drop two-byte support per Arnd Bergmann feedback. ]
[ Apply Geert Uytterhoeven feedback. ]
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Tested-by: Yujie Liu <yujie.liu@intel.com>
Cc: Andi Shyti <andi.shyti@linux.intel.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: "Peter Zijlstra (Intel)" <peterz@infradead.org>
Cc: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/xtensa/Kconfig | 1 | ||||
| -rw-r--r-- | arch/xtensa/include/asm/cmpxchg.h | 2 |
2 files changed, 3 insertions, 0 deletions
diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig index f200a4ec044e..d3db28f2f811 100644 --- a/arch/xtensa/Kconfig +++ b/arch/xtensa/Kconfig @@ -14,6 +14,7 @@ config XTENSA select ARCH_HAS_DMA_SET_UNCACHED if MMU select ARCH_HAS_STRNCPY_FROM_USER if !KASAN select ARCH_HAS_STRNLEN_USER + select ARCH_NEED_CMPXCHG_1_EMU select ARCH_USE_MEMTEST select ARCH_USE_QUEUED_RWLOCKS select ARCH_USE_QUEUED_SPINLOCKS diff --git a/arch/xtensa/include/asm/cmpxchg.h b/arch/xtensa/include/asm/cmpxchg.h index 675a11ea8de7..95e33a913962 100644 --- a/arch/xtensa/include/asm/cmpxchg.h +++ b/arch/xtensa/include/asm/cmpxchg.h @@ -15,6 +15,7 @@ #include <linux/bits.h> #include <linux/stringify.h> +#include <linux/cmpxchg-emu.h> /* * cmpxchg @@ -74,6 +75,7 @@ static __inline__ unsigned long __cmpxchg(volatile void *ptr, unsigned long old, unsigned long new, int size) { switch (size) { + case 1: return cmpxchg_emu_u8(ptr, old, new); case 4: return __cmpxchg_u32(ptr, old, new); default: __cmpxchg_called_with_bad_pointer(); return old; |