mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-24 05:04:00 +08:00
ec8c0446b6
Virtually index, physically tagged cache architectures can get away without cache flushing when forking. This patch adds a new cache flushing function flush_cache_dup_mm(struct mm_struct *) which for the moment I've implemented to do the same thing on all architectures except on MIPS where it's a no-op. Signed-off-by: Ralf Baechle <ralf@linux-mips.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
71 lines
2.2 KiB
C
71 lines
2.2 KiB
C
/*
|
|
* include/asm-v850/cacheflush.h
|
|
*
|
|
* Copyright (C) 2001,02,03 NEC Electronics Corporation
|
|
* Copyright (C) 2001,02,03 Miles Bader <miles@gnu.org>
|
|
*
|
|
* This file is subject to the terms and conditions of the GNU General
|
|
* Public License. See the file COPYING in the main directory of this
|
|
* archive for more details.
|
|
*
|
|
* Written by Miles Bader <miles@gnu.org>
|
|
*/
|
|
|
|
#ifndef __V850_CACHEFLUSH_H__
|
|
#define __V850_CACHEFLUSH_H__
|
|
|
|
/* Somebody depends on this; sigh... */
|
|
#include <linux/mm.h>
|
|
|
|
#include <asm/machdep.h>
|
|
|
|
|
|
/* The following are all used by the kernel in ways that only affect
|
|
systems with MMUs, so we don't need them. */
|
|
#define flush_cache_all() ((void)0)
|
|
#define flush_cache_mm(mm) ((void)0)
|
|
#define flush_cache_dup_mm(mm) ((void)0)
|
|
#define flush_cache_range(vma, start, end) ((void)0)
|
|
#define flush_cache_page(vma, vmaddr, pfn) ((void)0)
|
|
#define flush_dcache_page(page) ((void)0)
|
|
#define flush_dcache_mmap_lock(mapping) ((void)0)
|
|
#define flush_dcache_mmap_unlock(mapping) ((void)0)
|
|
#define flush_cache_vmap(start, end) ((void)0)
|
|
#define flush_cache_vunmap(start, end) ((void)0)
|
|
|
|
#ifdef CONFIG_NO_CACHE
|
|
|
|
/* Some systems have no cache at all, in which case we don't need these
|
|
either. */
|
|
#define flush_icache() ((void)0)
|
|
#define flush_icache_range(start, end) ((void)0)
|
|
#define flush_icache_page(vma,pg) ((void)0)
|
|
#define flush_icache_user_range(vma,pg,adr,len) ((void)0)
|
|
#define flush_cache_sigtramp(vaddr) ((void)0)
|
|
|
|
#else /* !CONFIG_NO_CACHE */
|
|
|
|
struct page;
|
|
struct mm_struct;
|
|
struct vm_area_struct;
|
|
|
|
/* Otherwise, somebody had better define them. */
|
|
extern void flush_icache (void);
|
|
extern void flush_icache_range (unsigned long start, unsigned long end);
|
|
extern void flush_icache_page (struct vm_area_struct *vma, struct page *page);
|
|
extern void flush_icache_user_range (struct vm_area_struct *vma,
|
|
struct page *page,
|
|
unsigned long adr, int len);
|
|
extern void flush_cache_sigtramp (unsigned long addr);
|
|
|
|
#endif /* CONFIG_NO_CACHE */
|
|
|
|
#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 /* __V850_CACHEFLUSH_H__ */
|