+ mm-wrap-__find_buddy_pfn-with-a-necessary-buddy-page-validation-v4.patch added to -mm tree

+ mm-wrap-__find_buddy_pfn-with-a-necessary-buddy-page-validation-v4.patch added to -mm tree

[Andrew Morton]

The patch titled
     Subject: mm-wrap-__find_buddy_pfn-with-a-necessary-buddy-page-validation-v4
has been added to the -mm tree.  Its filename is
     mm-wrap-__find_buddy_pfn-with-a-necessary-buddy-page-validation-v4.patch

This patch should soon appear at
    https://ozlabs.org/~akpm/mmots/broken-out/mm-wrap-__find_buddy_pfn-with-a-necessary-buddy-page-validation-v4.patch
and later at
    https://ozlabs.org/~akpm/mmotm/broken-out/mm-wrap-__find_buddy_pfn-with-a-necessary-buddy-page-validation-v4.patch

Before you just go and hit "reply", please:
   a) Consider who else should be cc'ed
   b) Prefer to cc a suitable mailing list as well
   c) Ideally: find the original patch on the mailing list and do a
      reply-to-all to that, adding suitable additional cc's

*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***

The -mm tree is included into linux-next and is updated
there every 3-4 working days

------------------------------------------------------
From: Zi Yan <ziy@nvidia.com>
Subject: mm-wrap-__find_buddy_pfn-with-a-necessary-buddy-page-validation-v4

updates per David

Link: https://lkml.kernel.org/r/20220401230804.1658207-2-zi.yan@sent.com
Link: https://lore.kernel.org/linux-mm/CAHk-=3Dwji_AmYygZMTsPMdJ7XksMt7kO=
ur8oDfDdniBRMjm4VkQ@mail.gmail.com/
Link: https://lkml.kernel.org/r/7236E7CA-B5F1-4C04-AB85-E86FA3E9A54B@nvidia.com
Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Zi Yan <ziy@nvidia.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: David Hildenbrand <david@redhat.com>
Cc: Steven Rostedt (Google) <rostedt@goodmis.org>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Oscar Salvador <osalvador@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/internal.h   |    4 ++--
 mm/page_alloc.c |    2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

--- a/mm/internal.h~mm-wrap-__find_buddy_pfn-with-a-necessary-buddy-page-validation-v4
+++ a/mm/internal.h
@@ -252,7 +252,7 @@ static inline unsigned int buddy_order(s
  * For recording page's order, we use page_private(page).
  */
 static inline bool page_is_buddy(struct page *page, struct page *buddy,
-							unsigned int order)
+				 unsigned int order)
 {
 	if (!page_is_guard(buddy) && !PageBuddy(buddy))
 		return false;
@@ -312,8 +312,8 @@ __find_buddy_pfn(unsigned long page_pfn,
 static inline struct page *find_buddy_page_pfn(struct page *page,
 			unsigned long pfn, unsigned int order, unsigned long *buddy_pfn)
 {
-	struct page *buddy;
 	unsigned long __buddy_pfn = __find_buddy_pfn(pfn, order);
+	struct page *buddy;
 
 	buddy = page + (__buddy_pfn - pfn);
 	if (buddy_pfn)
--- a/mm/page_alloc.c~mm-wrap-__find_buddy_pfn-with-a-necessary-buddy-page-validation-v4
+++ a/mm/page_alloc.c
@@ -976,8 +976,8 @@ static inline bool
 buddy_merge_likely(unsigned long pfn, unsigned long buddy_pfn,
 		   struct page *page, unsigned int order)
 {
-	struct page *higher_page;
 	unsigned long higher_page_pfn;
+	struct page *higher_page;
 
 	if (order >= MAX_ORDER - 2)
 		return false;
_

Patches currently in -mm which might be from ziy@nvidia.com are

mm-migrate-use-thp_order-instead-of-hpage_pmd_order-for-new-page-allocation.patch
mm-page_alloc-simplify-pageblock-migratetype-check-in-__free_one_page.patch
mm-wrap-__find_buddy_pfn-with-a-necessary-buddy-page-validation.patch
mm-wrap-__find_buddy_pfn-with-a-necessary-buddy-page-validation-v4.patch