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| author | Heiko Stuebner <heiko@sntech.de> | 2022-06-07 16:30:58 +0200 |
|---|---|---|
| committer | Palmer Dabbelt <palmer@rivosinc.com> | 2022-07-21 17:17:29 -0700 |
| commit | c295bc34ab58e917e2f2f789dd82b66fd2e2e299 (patch) | |
| tree | 010b56d7116e13d42a6fc622e072167adec493c6 /arch/riscv/include/asm/barrier.h | |
| parent | f2906aa863381afb0015a9eb7fefad885d4e5a56 (diff) | |
| download | linux-c295bc34ab58e917e2f2f789dd82b66fd2e2e299.tar.bz2 | |
riscv: introduce nops and __nops macros for NOP sequences
NOP sequences tend to get used for padding out alternative sections
This change adds macros for generating these sequences as both inline
asm blocks, but also as strings suitable for embedding in other asm
blocks directly.
It essentially mimics similar functionality from arm64 introduced by
Wil Deacon in commit f99a250cb6a3 ("arm64: barriers: introduce nops
and __nops macros for NOP sequences").
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Link: https://lore.kernel.org/r/20220607143059.1054074-2-heiko@sntech.de
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Diffstat (limited to 'arch/riscv/include/asm/barrier.h')
| -rw-r--r-- | arch/riscv/include/asm/barrier.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/riscv/include/asm/barrier.h b/arch/riscv/include/asm/barrier.h index d0e24aaa2aa0..110752594228 100644 --- a/arch/riscv/include/asm/barrier.h +++ b/arch/riscv/include/asm/barrier.h @@ -13,6 +13,8 @@ #ifndef __ASSEMBLY__ #define nop() __asm__ __volatile__ ("nop") +#define __nops(n) ".rept " #n "\nnop\n.endr\n" +#define nops(n) __asm__ __volatile__ (__nops(n)) #define RISCV_FENCE(p, s) \ __asm__ __volatile__ ("fence " #p "," #s : : : "memory") |