From ee5e41b5f21a5438664effce1ba5bdd11e03ee24 Mon Sep 17 00:00:00 2001 From: Robin Murphy Date: Thu, 8 Sep 2016 11:02:20 +0100 Subject: [PATCH] arm64/io: Allow I/O writes to use {W,X}ZR When zeroing an I/O location, the current accessors are forced to allocate a temporary register to store the zero for the write. By tweaking the assembly constraints, we can allow the compiler to use the zero register directly in such cases, and save some juggling. Compiling a representative kernel configuration with GCC 6 shows that 2.3KB worth of code can be wasted just on that! text data bss dec hex filename 13316776 3248256 18176769 34741801 2121e29 vmlinux.o.new 13319140 3248256 18176769 34744165 2122765 vmlinux.o.old Acked-by: Mark Rutland Signed-off-by: Robin Murphy Signed-off-by: Will Deacon --- arch/arm64/include/asm/io.h | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/arch/arm64/include/asm/io.h b/arch/arm64/include/asm/io.h index ce20741b2cb5..0bba427bb4c2 100644 --- a/arch/arm64/include/asm/io.h +++ b/arch/arm64/include/asm/io.h @@ -40,25 +40,25 @@ #define __raw_writeb __raw_writeb static inline void __raw_writeb(u8 val, volatile void __iomem *addr) { - asm volatile("strb %w0, [%1]" : : "r" (val), "r" (addr)); + asm volatile("strb %w0, [%1]" : : "rZ" (val), "r" (addr)); } #define __raw_writew __raw_writew static inline void __raw_writew(u16 val, volatile void __iomem *addr) { - asm volatile("strh %w0, [%1]" : : "r" (val), "r" (addr)); + asm volatile("strh %w0, [%1]" : : "rZ" (val), "r" (addr)); } #define __raw_writel __raw_writel static inline void __raw_writel(u32 val, volatile void __iomem *addr) { - asm volatile("str %w0, [%1]" : : "r" (val), "r" (addr)); + asm volatile("str %w0, [%1]" : : "rZ" (val), "r" (addr)); } #define __raw_writeq __raw_writeq static inline void __raw_writeq(u64 val, volatile void __iomem *addr) { - asm volatile("str %0, [%1]" : : "r" (val), "r" (addr)); + asm volatile("str %x0, [%1]" : : "rZ" (val), "r" (addr)); } #define __raw_readb __raw_readb -- 2.20.1