From cbf52afdc0eb88492cf7808cc4b4f58a46f1b1ad Mon Sep 17 00:00:00 2001 From: David Gibson Date: Fri, 9 Dec 2005 14:20:52 +1100 Subject: [PATCH] powerpc: Add missing icache flushes for hugepages On most powerpc CPUs, the dcache and icache are not coherent so between writing and executing a page, the caches must be flushed. Userspace programs assume pages given to them by the kernel are icache clean, so we must do this flush between the kernel clearing a page and it being mapped into userspace for execute. We were not doing this for hugepages, this patch corrects the situation. We use the same lazy mechanism as we use for normal pages, delaying the flush until userspace actually attempts to execute from the page in question. Tested on G5. Signed-off-by: David Gibson Signed-off-by: Paul Mackerras --- include/asm-powerpc/mmu.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'include') diff --git a/include/asm-powerpc/mmu.h b/include/asm-powerpc/mmu.h index c1b4bbabbe97..29b0bb0086d3 100644 --- a/include/asm-powerpc/mmu.h +++ b/include/asm-powerpc/mmu.h @@ -220,7 +220,8 @@ extern int __hash_page_64K(unsigned long ea, unsigned long access, unsigned int local); struct mm_struct; extern int hash_huge_page(struct mm_struct *mm, unsigned long access, - unsigned long ea, unsigned long vsid, int local); + unsigned long ea, unsigned long vsid, int local, + unsigned long trap); extern void htab_finish_init(void); extern int htab_bolt_mapping(unsigned long vstart, unsigned long vend, -- cgit v1.2.3