Commit 833d8a42 authored Jun 03, 2020 by Wei Yang Committed by Linus Torvalds Jun 03, 2020

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



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 e570f56c ("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>

parent 237e506c

mm/page_alloc.c

+5 −7

Original line number	Diff line number	Diff line
		@@ -2097,19 +2097,17 @@ static void check_new_page_bad(struct page *page)
		const char *bad_reason = NULL;
		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))
		bad_reason = "nonzero mapcount";
		if (unlikely(page->mapping != NULL))
		bad_reason = "non-NULL mapping";
		if (unlikely(page_ref_count(page) != 0))
		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)) {
		bad_reason = "PAGE_FLAGS_CHECK_AT_PREP flag set";
		bad_flags = PAGE_FLAGS_CHECK_AT_PREP;