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
/*
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* include/asm-v850/cacheflush.h
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*
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* Copyright (C) 2001,02,03 NEC Electronics Corporation
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* Copyright (C) 2001,02,03 Miles Bader <miles@gnu.org>
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*
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* This file is subject to the terms and conditions of the GNU General
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* Public License. See the file COPYING in the main directory of this
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* archive for more details.
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*
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* Written by Miles Bader <miles@gnu.org>
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*/
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#ifndef __V850_CACHEFLUSH_H__
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#define __V850_CACHEFLUSH_H__
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/* Somebody depends on this; sigh... */
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#include <linux/mm.h>
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#include <asm/machdep.h>
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/* The following are all used by the kernel in ways that only affect
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systems with MMUs, so we don't need them. */
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#define flush_cache_all() ((void)0)
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#define flush_cache_mm(mm) ((void)0)
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#define flush_cache_dup_mm(mm) ((void)0)
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#define flush_cache_range(vma, start, end) ((void)0)
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#define flush_cache_page(vma, vmaddr, pfn) ((void)0)
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#define flush_dcache_page(page) ((void)0)
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#define flush_dcache_mmap_lock(mapping) ((void)0)
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#define flush_dcache_mmap_unlock(mapping) ((void)0)
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#define flush_cache_vmap(start, end) ((void)0)
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#define flush_cache_vunmap(start, end) ((void)0)
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#ifdef CONFIG_NO_CACHE
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/* Some systems have no cache at all, in which case we don't need these
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either. */
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#define flush_icache() ((void)0)
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#define flush_icache_range(start, end) ((void)0)
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#define flush_icache_page(vma,pg) ((void)0)
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#define flush_icache_user_range(vma,pg,adr,len) ((void)0)
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#define flush_cache_sigtramp(vaddr) ((void)0)
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#else /* !CONFIG_NO_CACHE */
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struct page;
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struct mm_struct;
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struct vm_area_struct;
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/* Otherwise, somebody had better define them. */
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extern void flush_icache (void);
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extern void flush_icache_range (unsigned long start, unsigned long end);
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extern void flush_icache_page (struct vm_area_struct *vma, struct page *page);
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extern void flush_icache_user_range (struct vm_area_struct *vma,
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struct page *page,
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unsigned long adr, int len);
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extern void flush_cache_sigtramp (unsigned long addr);
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#endif /* CONFIG_NO_CACHE */
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#define copy_to_user_page(vma, page, vaddr, dst, src, len) \
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do { memcpy(dst, src, len); \
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flush_icache_user_range(vma, page, vaddr, len); \
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} while (0)
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#define copy_from_user_page(vma, page, vaddr, dst, src, len) \
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memcpy(dst, src, len)
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#endif /* __V850_CACHEFLUSH_H__ */
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