diff options
| author | Paul E. McKenney <[email protected]> | 2024-03-27 15:21:31 -0700 |
|---|---|---|
| committer | Paul E. McKenney <[email protected]> | 2024-09-13 07:10:38 -0700 |
| commit | c81a748edefd098ea21dd35d4bba03f69412fc26 (patch) | |
| tree | c04d181cc52b0ee66bc0172392cc6414bc5a01ac | |
| parent | f2519d4d4fc4d36f2b58c5614357de9f5b4032fc (diff) | |
sh: Emulate one-byte cmpxchg
Use the new cmpxchg_emu_u8() to emulate one-byte cmpxchg() on sh.
[ paulmck: Drop two-byte support per Arnd Bergmann feedback. ]
[ paulmck: Apply feedback from Naresh Kamboju. ]
[ Apply Geert Uytterhoeven feedback. ]
Signed-off-by: Paul E. McKenney <[email protected]>
Cc: Andi Shyti <[email protected]>
Cc: Palmer Dabbelt <[email protected]>
Cc: Masami Hiramatsu <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Cc: <[email protected]>
Acked-by: John Paul Adrian Glaubitz <[email protected]>
| -rw-r--r-- | arch/sh/Kconfig | 1 | ||||
| -rw-r--r-- | arch/sh/include/asm/cmpxchg.h | 3 |
2 files changed, 4 insertions, 0 deletions
diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig index 1aa3c4a0c5b2..e9103998cca9 100644 --- a/arch/sh/Kconfig +++ b/arch/sh/Kconfig @@ -14,6 +14,7 @@ config SUPERH select ARCH_HIBERNATION_POSSIBLE if MMU select ARCH_MIGHT_HAVE_PC_PARPORT select ARCH_WANT_IPC_PARSE_VERSION + select ARCH_NEED_CMPXCHG_1_EMU select CPU_NO_EFFICIENT_FFS select DMA_DECLARE_COHERENT select GENERIC_ATOMIC64 diff --git a/arch/sh/include/asm/cmpxchg.h b/arch/sh/include/asm/cmpxchg.h index 5d617b3ef78f..1e5dc5ccf7bf 100644 --- a/arch/sh/include/asm/cmpxchg.h +++ b/arch/sh/include/asm/cmpxchg.h @@ -9,6 +9,7 @@ #include <linux/compiler.h> #include <linux/types.h> +#include <linux/cmpxchg-emu.h> #if defined(CONFIG_GUSA_RB) #include <asm/cmpxchg-grb.h> @@ -56,6 +57,8 @@ 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); } |