From f99a250cb6a3b301b101b4c0f5fcb80593bba6dc Mon Sep 17 00:00:00 2001 From: Will Deacon Date: Tue, 6 Sep 2016 16:40:23 +0100 Subject: arm64: barriers: introduce nops and __nops macros for NOP sequences NOP sequences tend to get used for padding out alternative sections and uarch-specific pipeline flushes in errata workarounds. This patch adds macros for generating these sequences as both inline asm blocks, but also as strings suitable for embedding in other asm blocks directly. Signed-off-by: Will Deacon --- arch/arm64/include/asm/assembler.h | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'arch/arm64/include/asm/assembler.h') diff --git a/arch/arm64/include/asm/assembler.h b/arch/arm64/include/asm/assembler.h index f09a5ae48a44..28bfe6132eb6 100644 --- a/arch/arm64/include/asm/assembler.h +++ b/arch/arm64/include/asm/assembler.h @@ -86,6 +86,15 @@ dmb \opt .endm +/* + * NOP sequence + */ + .macro nops, num + .rept \num + nop + .endr + .endm + /* * Emit an entry into the exception table */ -- cgit v1.2.1