forked from Minki/linux
2d4dc890b5
Mtdblock driver doesn't call flush_dcache_page for pages in request. So, this causes problems on architectures where the icache doesn't fill from the dcache or with dcache aliases. The patch fixes this. The ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE symbol was introduced to avoid pointless empty cache-thrashing loops on architectures for which flush_dcache_page() is a no-op. Every architecture was provided with this flush pages on architectires where ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE is equal 1 or do nothing otherwise. See "fix mtd_blkdevs problem with caches on some architectures" discussion on LKML for more information. Signed-off-by: Ilya Loginov <isloginov@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: David Woodhouse <dwmw2@infradead.org> Cc: Peter Horton <phorton@bitbox.co.uk> Cc: "Ed L. Cashin" <ecashin@coraid.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
32 lines
1.2 KiB
C
32 lines
1.2 KiB
C
#ifndef __ASM_CACHEFLUSH_H
|
|
#define __ASM_CACHEFLUSH_H
|
|
|
|
/* Keep includes the same across arches. */
|
|
#include <linux/mm.h>
|
|
|
|
/*
|
|
* The cache doesn't need to be flushed when TLB entries change when
|
|
* the cache is mapped to physical memory, not virtual memory
|
|
*/
|
|
#define flush_cache_all() do { } while (0)
|
|
#define flush_cache_mm(mm) do { } while (0)
|
|
#define flush_cache_dup_mm(mm) do { } while (0)
|
|
#define flush_cache_range(vma, start, end) do { } while (0)
|
|
#define flush_cache_page(vma, vmaddr, pfn) do { } while (0)
|
|
#define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 0
|
|
#define flush_dcache_page(page) do { } while (0)
|
|
#define flush_dcache_mmap_lock(mapping) do { } while (0)
|
|
#define flush_dcache_mmap_unlock(mapping) do { } while (0)
|
|
#define flush_icache_range(start, end) do { } while (0)
|
|
#define flush_icache_page(vma,pg) do { } while (0)
|
|
#define flush_icache_user_range(vma,pg,adr,len) do { } while (0)
|
|
#define flush_cache_vmap(start, end) do { } while (0)
|
|
#define flush_cache_vunmap(start, end) do { } while (0)
|
|
|
|
#define copy_to_user_page(vma, page, vaddr, dst, src, len) \
|
|
memcpy(dst, src, len)
|
|
#define copy_from_user_page(vma, page, vaddr, dst, src, len) \
|
|
memcpy(dst, src, len)
|
|
|
|
#endif /* __ASM_CACHEFLUSH_H */
|