From: Nick Piggin Date: Mon, 16 Jul 2007 06:38:12 +0000 (-0700) Subject: mm: debug check for the fault vs invalidate race X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=45426812d6b601430d560cb6049757b5b0bc71c4;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git mm: debug check for the fault vs invalidate race Add a bugcheck for Andrea's pagefault vs invalidate race. This is triggerable for both linear and nonlinear pages with a userspace test harness (using direct IO and truncate, respectively). Signed-off-by: Nick Piggin Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/mm/filemap.c b/mm/filemap.c index c6ebd9f912ab..e006c57bda54 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -120,6 +120,7 @@ void __remove_from_page_cache(struct page *page) page->mapping = NULL; mapping->nrpages--; __dec_zone_page_state(page, NR_FILE_PAGES); + BUG_ON(page_mapped(page)); } void remove_from_page_cache(struct page *page)