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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>
52 lines
1.6 KiB
C
52 lines
1.6 KiB
C
#ifndef _ASM_IA64_CACHEFLUSH_H
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#define _ASM_IA64_CACHEFLUSH_H
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/*
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* Copyright (C) 2002 Hewlett-Packard Co
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* David Mosberger-Tang <davidm@hpl.hp.com>
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*/
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#include <linux/page-flags.h>
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#include <asm/bitops.h>
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#include <asm/page.h>
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/*
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* Cache flushing routines. This is the kind of stuff that can be very expensive, so try
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* to avoid them whenever possible.
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*/
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#define flush_cache_all() do { } while (0)
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#define flush_cache_mm(mm) do { } while (0)
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#define flush_cache_dup_mm(mm) do { } while (0)
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#define flush_cache_range(vma, start, end) do { } while (0)
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#define flush_cache_page(vma, vmaddr, pfn) do { } while (0)
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#define flush_icache_page(vma,page) do { } while (0)
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#define flush_cache_vmap(start, end) do { } while (0)
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#define flush_cache_vunmap(start, end) do { } while (0)
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#define flush_dcache_page(page) \
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do { \
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clear_bit(PG_arch_1, &(page)->flags); \
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} while (0)
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#define flush_dcache_mmap_lock(mapping) do { } while (0)
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#define flush_dcache_mmap_unlock(mapping) do { } while (0)
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extern void flush_icache_range (unsigned long start, unsigned long end);
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#define flush_icache_user_range(vma, page, user_addr, len) \
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do { \
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unsigned long _addr = (unsigned long) page_address(page) + ((user_addr) & ~PAGE_MASK); \
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flush_icache_range(_addr, _addr + (len)); \
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} while (0)
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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 /* _ASM_IA64_CACHEFLUSH_H */
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