From dd21bfa425c098b95ca86845f8e7d1ec1ddf6e4a Mon Sep 17 00:00:00 2001 From: Yun Zhou Date: Fri, 4 Mar 2022 20:29:07 -0800 Subject: proc: fix documentation and description of pagemap Since bit 57 was exported for uffd-wp write-protected (commit fb8e37f35a2f: "mm/pagemap: export uffd-wp protection information"), fixing it can reduce some unnecessary confusion. Link: https://lkml.kernel.org/r/20220301044538.3042713-1-yun.zhou@windriver.com Fixes: fb8e37f35a2fe1 ("mm/pagemap: export uffd-wp protection information") Signed-off-by: Yun Zhou Reviewed-by: Peter Xu Cc: Jonathan Corbet Cc: Tiberiu A Georgescu Cc: Florian Schmidt Cc: Ivan Teterevkov Cc: SeongJae Park Cc: Yang Shi Cc: David Hildenbrand Cc: Axel Rasmussen Cc: Miaohe Lin Cc: Andrea Arcangeli Cc: Colin Cross Cc: Alistair Popple Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/proc/task_mmu.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'fs/proc/task_mmu.c') diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c index 2c48b1eaaa9c..f46060eb91b5 100644 --- a/fs/proc/task_mmu.c +++ b/fs/proc/task_mmu.c @@ -1597,7 +1597,8 @@ static const struct mm_walk_ops pagemap_ops = { * Bits 5-54 swap offset if swapped * Bit 55 pte is soft-dirty (see Documentation/admin-guide/mm/soft-dirty.rst) * Bit 56 page exclusively mapped - * Bits 57-60 zero + * Bit 57 pte is uffd-wp write-protected + * Bits 58-60 zero * Bit 61 page is file-page or shared-anon * Bit 62 page swapped * Bit 63 page present -- cgit v1.2.3