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[ARM] 4078/1: Fix ARM copypage cache coherency problems

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If PG_dcache_dirty is set for a page, we need to flush the source page
before performing any copypage operation using a different virtual address.

This fixes the copypage implementations for XScale, StrongARM and ARMv6.

This patch fixes segmentation faults seen in the dynamic linker under
the usage patterns in glibc 2.4/2.5.

Signed-off-by: Richard Purdie <[email protected]>
Signed-off-by: Russell King <[email protected]>
This commit is contained in:
Richard Purdie 2006-12-30 16:08:50 +01:00 • committed by Russell King
commit 1c9d3df5e8
4 changed files with 18 additions and 0 deletions
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2
include/asm-arm/cacheflush.h
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@ -355,6 +355,8 @@ extern void flush_ptrace_access(struct vm_area_struct *vma, struct page *page,
*/
extern void flush_dcache_page(struct page *);
extern void __flush_dcache_page(struct address_space *mapping, struct page *page);
#define flush_dcache_mmap_lock(mapping) \
write_lock_irq(&(mapping)->tree_lock)
#define flush_dcache_mmap_unlock(mapping) \