From 92820a5f99748b02a3713a314d81e2fd0b6b2f80 Mon Sep 17 00:00:00 2001 From: Sebastian Ott Date: Thu, 23 May 2013 11:55:07 +0200 Subject: [PATCH] s390: remove virt_to_phys implementation virt_to_phys on s390 currently uses the LRA instruction to translate virtual to physical addresses. This creates an unnecessary overhead and caused trouble with dma debugging code (when called with an address pointing to a already unmapped page). Just get rid of s390's implementation and use the one from asm-generic/io.h . Note: with this change virt_to_phys will no longer work on vmalloc'ed addresses. Reviewed-by: Gerald Schaefer Signed-off-by: Sebastian Ott Signed-off-by: Martin Schwidefsky --- arch/s390/include/asm/io.h | 22 ---------------------- 1 file changed, 22 deletions(-) diff --git a/arch/s390/include/asm/io.h b/arch/s390/include/asm/io.h index fd9be01..cd6b9ee 100644 --- a/arch/s390/include/asm/io.h +++ b/arch/s390/include/asm/io.h @@ -13,28 +13,6 @@ #include #include -/* - * Change virtual addresses to physical addresses and vv. - * These are pretty trivial - */ -static inline unsigned long virt_to_phys(volatile void * address) -{ - unsigned long real_address; - asm volatile( - " lra %0,0(%1)\n" - " jz 0f\n" - " la %0,0\n" - "0:" - : "=a" (real_address) : "a" (address) : "cc"); - return real_address; -} -#define virt_to_phys virt_to_phys - -static inline void * phys_to_virt(unsigned long address) -{ - return (void *) address; -} - void *xlate_dev_mem_ptr(unsigned long phys); #define xlate_dev_mem_ptr xlate_dev_mem_ptr void unxlate_dev_mem_ptr(unsigned long phys, void *addr); -- 2.7.4