mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-27 22:53:55 +08:00
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>
41 lines
1.1 KiB
C
41 lines
1.1 KiB
C
/*
|
|
* (C) Copyright 2002, Yoshinori Sato <ysato@users.sourceforge.jp>
|
|
*/
|
|
|
|
#ifndef _ASM_H8300_CACHEFLUSH_H
|
|
#define _ASM_H8300_CACHEFLUSH_H
|
|
|
|
/*
|
|
* Cache handling functions
|
|
* No Cache memory all dummy functions
|
|
*/
|
|
|
|
#define flush_cache_all()
|
|
#define flush_cache_mm(mm)
|
|
#define flush_cache_dup_mm(mm) do { } while (0)
|
|
#define flush_cache_range(vma,a,b)
|
|
#define flush_cache_page(vma,p,pfn)
|
|
#define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 0
|
|
#define flush_dcache_page(page)
|
|
#define flush_dcache_mmap_lock(mapping)
|
|
#define flush_dcache_mmap_unlock(mapping)
|
|
#define flush_icache()
|
|
#define flush_icache_page(vma,page)
|
|
#define flush_icache_range(start,len)
|
|
#define flush_cache_vmap(start, end)
|
|
#define flush_cache_vunmap(start, end)
|
|
#define cache_push_v(vaddr,len)
|
|
#define cache_push(paddr,len)
|
|
#define cache_clear(paddr,len)
|
|
|
|
#define flush_dcache_range(a,b)
|
|
|
|
#define flush_icache_user_range(vma,page,addr,len)
|
|
|
|
#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_H8300_CACHEFLUSH_H */
|