From 91cb163e4d141c74e99639fbee7c2a6332c92901 Mon Sep 17 00:00:00 2001 From: Will Deacon Date: Mon, 17 Oct 2016 13:38:14 +0100 Subject: [PATCH] arm64: sysreg: Fix use of XZR in write_sysreg_s Commit 8a71f0c656e0 ("arm64: sysreg: replace open-coded mrs_s/msr_s with {read,write}_sysreg_s") introduced a write_sysreg_s macro for writing to system registers that are not supported by binutils. Unfortunately, this was implemented with the wrong template (%0 vs %x0), so in the case that we are writing a constant 0, we will generate invalid instruction syntax and bail with a cryptic assembler error: | Error: constant expression required This patch fixes the template. Acked-by: Mark Rutland Signed-off-by: Will Deacon --- arch/arm64/include/asm/sysreg.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm64/include/asm/sysreg.h b/arch/arm64/include/asm/sysreg.h index e8d46e8e60791..6c80b3699cb8a 100644 --- a/arch/arm64/include/asm/sysreg.h +++ b/arch/arm64/include/asm/sysreg.h @@ -286,7 +286,7 @@ asm( #define write_sysreg_s(v, r) do { \ u64 __val = (u64)v; \ - asm volatile("msr_s " __stringify(r) ", %0" : : "rZ" (__val)); \ + asm volatile("msr_s " __stringify(r) ", %x0" : : "rZ" (__val)); \ } while (0) static inline void config_sctlr_el1(u32 clear, u32 set) -- 2.39.2