mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-23 04:34:11 +08:00
f68aa5b445
The copy_to_user_page() function is supposed to flush the icache on the memory that was written, but the current asm-generic version lacks that logic. While normally it isn't a big deal as the asm-generic version of icache flushing is a stub, it is a deal for ports that want to use the asm-generic version as a baseline and then overlay its own specific parts (like icache flushing). Signed-off-by: Mike Frysinger <vapier@gentoo.org> Cc: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
35 lines
1.3 KiB
C
35 lines
1.3 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) \
|
|
do { \
|
|
memcpy(dst, src, len); \
|
|
flush_icache_user_range(vma, page, vaddr, len); \
|
|
} while (0)
|
|
#define copy_from_user_page(vma, page, vaddr, dst, src, len) \
|
|
memcpy(dst, src, len)
|
|
|
|
#endif /* __ASM_CACHEFLUSH_H */
|