From 1c9d3df5e88ad7db23f5b22f4341c39722a904a4 Mon Sep 17 00:00:00 2001 From: Richard Purdie Date: Sat, 30 Dec 2006 16:08:50 +0100 Subject: [ARM] 4078/1: Fix ARM copypage cache coherency problems 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 Signed-off-by: Russell King --- arch/arm/mm/copypage-v4mc.c | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'arch/arm/mm/copypage-v4mc.c') diff --git a/arch/arm/mm/copypage-v4mc.c b/arch/arm/mm/copypage-v4mc.c index 408b05ae6b9..ded0e96d069 100644 --- a/arch/arm/mm/copypage-v4mc.c +++ b/arch/arm/mm/copypage-v4mc.c @@ -19,6 +19,7 @@ #include #include #include +#include #include "mm.h" @@ -69,6 +70,11 @@ mc_copy_user_page(void *from, void *to) void v4_mc_copy_user_page(void *kto, const void *kfrom, unsigned long vaddr) { + struct page *page = virt_to_page(kfrom); + + if (test_and_clear_bit(PG_dcache_dirty, &page->flags)) + __flush_dcache_page(page_mapping(page), page); + spin_lock(&minicache_lock); set_pte_ext(TOP_PTE(0xffff8000), pfn_pte(__pa(kfrom) >> PAGE_SHIFT, minicache_pgprot), 0); -- cgit v1.2.3