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mm/page_alloc.c: bad_[reason|flags] is not necessary when PageHWPoison

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Patch series "mm/page_alloc.c: cleanup on check page", v3.

This patchset does some cleanup related to check page.

1. Remove unnecessary bad_reason assignment
2. Remove bad_flags to bad_page()
3. Rename function for naming convention
4. Extract common part to check page

Thanks for suggestions from David Rientjes and Anshuman Khandual.

This patch (of 5):

Since function returns directly, bad_[reason|flags] is not used any where.
And move this to the first.

This is a following cleanup for commit e570f56ccc ("mm:
check_new_page_bad() directly returns in __PG_HWPOISON case")

Signed-off-by: Wei Yang <richard.weiyang@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: David Hildenbrand <david@redhat.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: David Rientjes <rientjes@google.com>
Link: http://lkml.kernel.org/r/20200411220357.9636-2-richard.weiyang@gmail.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Wei Yang 2020-06-03 15:58:26 -07:00 • committed by Linus Torvalds
parent 237e506cd5
commit 833d8a426f
1 changed files with 5 additions and 7 deletions
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12
mm/page_alloc.c
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@ -2097,19 +2097,17 @@ static void check_new_page_bad(struct page *page)
const char *bad_reason = NULL; const char *bad_reason = NULL;
unsigned long bad_flags = 0; unsigned long bad_flags = 0;
if (unlikely(page->flags & __PG_HWPOISON)) {
/* Don't complain about hwpoisoned pages */
page_mapcount_reset(page); /* remove PageBuddy */
return;
}
if (unlikely(atomic_read(&page->_mapcount) != -1)) if (unlikely(atomic_read(&page->_mapcount) != -1))
bad_reason = "nonzero mapcount"; bad_reason = "nonzero mapcount";
if (unlikely(page->mapping != NULL)) if (unlikely(page->mapping != NULL))
bad_reason = "non-NULL mapping"; bad_reason = "non-NULL mapping";
if (unlikely(page_ref_count(page) != 0)) if (unlikely(page_ref_count(page) != 0))
bad_reason = "nonzero _refcount"; bad_reason = "nonzero _refcount";
if (unlikely(page->flags & __PG_HWPOISON)) {
bad_reason = "HWPoisoned (hardware-corrupted)";
bad_flags = __PG_HWPOISON;
/* Don't complain about hwpoisoned pages */
page_mapcount_reset(page); /* remove PageBuddy */
return;
}
if (unlikely(page->flags & PAGE_FLAGS_CHECK_AT_PREP)) { if (unlikely(page->flags & PAGE_FLAGS_CHECK_AT_PREP)) {
bad_reason = "PAGE_FLAGS_CHECK_AT_PREP flag set"; bad_reason = "PAGE_FLAGS_CHECK_AT_PREP flag set";
bad_flags = PAGE_FLAGS_CHECK_AT_PREP; bad_flags = PAGE_FLAGS_CHECK_AT_PREP;