Commit 76b3b58f authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Linus Torvalds
Browse files

asm-generic: improve the flush_dcache_page stub 



There is a magic ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE cpp symbol that
guards non-stub availability of flush_dcache_pagge.  Use that to check
if flush_dcache_pagg is implemented.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Link: http://lkml.kernel.org/r/20200515143646.3857579-8-hch@lst.de


Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent e0cf615d

include/asm-generic/cacheflush.h

+3 −3
Original line number Diff line number Diff line
@@ -2,8 +2,6 @@ 
#ifndef _ASM_GENERIC_CACHEFLUSH_H

#define _ASM_GENERIC_CACHEFLUSH_H



#define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 0



/*

 * The cache doesn't need to be flushed when TLB entries change when

 * the cache is mapped to physical memory, not virtual memory
@@ -42,12 +40,14 @@ static inline void flush_cache_page(struct vm_area_struct *vma, 
}

#endif



#ifndef flush_dcache_page

#ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE

static inline void flush_dcache_page(struct page *page)

{

}

#define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 0

#endif





#ifndef flush_dcache_mmap_lock

static inline void flush_dcache_mmap_lock(struct address_space *mapping)

{