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authorOscar Salvador <osalvador@suse.de>2020-10-15 20:07:17 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2020-10-16 11:11:16 -0700
commit5a2ffca3c23333a41cf8604f62994cfd28e4267b (patch)
tree2a8c7c5618fa3bd4ef3327599772a65cdb9570ff /mm/madvise.c
parent6b9a217eda4a13cc72914fdf7433712122ff595b (diff)
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mm,hwpoison: return 0 if the page is already poisoned in soft-offline
Currently, there is an inconsistency when calling soft-offline from different paths on a page that is already poisoned. 1) madvise: madvise_inject_error skips any poisoned page and continues the loop. If that was the only page to madvise, it returns 0. 2) /sys/devices/system/memory/: When calling soft_offline_page_store()->soft_offline_page(), we return -EBUSY in case the page is already poisoned. This is inconsistent with a) the above example and b) memory_failure, where we return 0 if the page was poisoned. Fix this by dropping the PageHWPoison() check in madvise_inject_error, and let soft_offline_page return 0 if it finds the page already poisoned. Please, note that this represents a user-api change, since now the return error when calling soft_offline_page_store()->soft_offline_page() will be different. Signed-off-by: Oscar Salvador <osalvador@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Acked-by: Naoya Horiguchi <naoya.horiguchi@nec.com> Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com> Cc: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Cc: Aristeu Rozanski <aris@ruivo.org> Cc: Dave Hansen <dave.hansen@intel.com> Cc: David Hildenbrand <david@redhat.com> Cc: Dmitry Yakunin <zeil@yandex-team.ru> Cc: Michal Hocko <mhocko@kernel.org> Cc: Mike Kravetz <mike.kravetz@oracle.com> Cc: Oscar Salvador <osalvador@suse.com> Cc: Qian Cai <cai@lca.pw> Cc: Tony Luck <tony.luck@intel.com> Link: https://lkml.kernel.org/r/20200922135650.1634-12-osalvador@suse.de Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/madvise.c')
-rw-r--r--mm/madvise.c5
1 files changed, 0 insertions, 5 deletions
diff --git a/mm/madvise.c b/mm/madvise.c
index 0039bfe4ca9f..68b761c359d0 100644
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -896,11 +896,6 @@ static int madvise_inject_error(int behavior,
*/
size = page_size(compound_head(page));
- if (PageHWPoison(page)) {
- put_page(page);
- continue;
- }
-
if (behavior == MADV_SOFT_OFFLINE) {
pr_info("Soft offlining pfn %#lx at process virtual address %#lx\n",
pfn, start);