From 7959722b951cffcd61a0a35229d007deeed8c2dd Mon Sep 17 00:00:00 2001 From: Jie Zhang Date: Wed, 6 Jan 2010 17:23:28 +0000 Subject: NOMMU: Use copy_*_user_page() in access_process_vm() The MMU code uses the copy_*_user_page() variants in access_process_vm() rather than copy_*_user() as the former includes an icache flush. This is important when doing things like setting software breakpoints with gdb. So switch the NOMMU code over to do the same. This patch makes the reasonable assumption that copy_from_user_page() won't fail - which is probably fine, as we've checked the VMA from which we're copying is usable, and the copy is not allowed to cross VMAs. The one case where it might go wrong is if the VMA is a device rather than RAM, and that device returns an error which - in which case rubbish will be returned rather than EIO. Signed-off-by: Jie Zhang Signed-off-by: Mike Frysinger Signed-off-by: David Howells Acked-by: David McCullough Acked-by: Paul Mundt Acked-by: Greg Ungerer Signed-off-by: Linus Torvalds --- mm/nommu.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) (limited to 'mm') diff --git a/mm/nommu.c b/mm/nommu.c index a8d17521624a..17773862619b 100644 --- a/mm/nommu.c +++ b/mm/nommu.c @@ -1921,9 +1921,11 @@ int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, in /* only read or write mappings where it is permitted */ if (write && vma->vm_flags & VM_MAYWRITE) - len -= copy_to_user((void *) addr, buf, len); + copy_to_user_page(vma, NULL, addr, + (void *) addr, buf, len); else if (!write && vma->vm_flags & VM_MAYREAD) - len -= copy_from_user(buf, (void *) addr, len); + copy_from_user_page(vma, NULL, addr, + buf, (void *) addr, len); else len = 0; } else { -- cgit v1.2.3-58-ga151