Commit 92820a5f authored May 23, 2013 by Sebastian Ott Committed by Martin Schwidefsky Jun 26, 2013

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 <gerald.schaefer@de.ibm.com>
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

parent b6ed49e0

arch/s390/include/asm/io.h

+0 −22

Original line number	Diff line number	Diff line
		@@ -13,28 +13,6 @@
		#include <asm/page.h>
		#include <asm/pci_io.h>

		/*
		* 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);

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