From 76c8e25b905f99be5ddbe999597ba7c2c33ec64b Mon Sep 17 00:00:00 2001 From: Benjamin Herrenschmidt Date: Tue, 8 Nov 2005 11:21:05 +1100 Subject: [PATCH] [PATCH] ppc64: Fix the lazy icache/dcache code for non-RAM pages For some stupid reason I can't explain (brown paper bag is at hand), I removed the check pfn_valid() in the code that does the icache/dcache coherency on POWER4 and later. That causes us to eventually try to access non existing struct page when hashing in IO pages. Signed-off-by: Benjamin Herrenschmidt Signed-off-by: Paul Mackerras --- arch/powerpc/mm/hash_utils_64.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/powerpc/mm/hash_utils_64.c b/arch/powerpc/mm/hash_utils_64.c index 3d83c3b84f0..22e47487613 100644 --- a/arch/powerpc/mm/hash_utils_64.c +++ b/arch/powerpc/mm/hash_utils_64.c @@ -507,6 +507,9 @@ unsigned int hash_page_do_lazy_icache(unsigned int pp, pte_t pte, int trap) { struct page *page; + if (!pfn_valid(pte_pfn(pte))) + return pp; + page = pte_page(pte); /* page is dirty */ -- 2.20.1