+ mm-fix-missing-handler-for-__gfp_nowarn-v2.patch added to mm-unstable branch

+ mm-fix-missing-handler-for-__gfp_nowarn-v2.patch added to mm-unstable branch

[Andrew Morton]

The patch titled
     Subject: mm-fix-missing-handler-for-__gfp_nowarn-v2
has been added to the -mm mm-unstable branch.  Its filename is
     mm-fix-missing-handler-for-__gfp_nowarn-v2.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-fix-missing-handler-for-__gfp_nowarn-v2.patch

This patch will later appear in the mm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Qi Zheng <zhengqi.arch@bytedance.com>
Subject: mm-fix-missing-handler-for-__gfp_nowarn-v2

  - add comment to WARN_ON_ONCE_GFP
  - handle __alloc_contig_migrate_range() case
  - do not deal with:
	WARN_ON_ONCE((gfp_flags & __GFP_NOFAIL) && (order > 1));

Link: https://lkml.kernel.org/r/20220511061951.1114-1-zhengqi.arch@bytedance.com
Signed-off-by: Qi Zheng <zhengqi.arch@bytedance.com>
Cc: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jiri Slaby <jirislaby@kernel.org>
Cc: Steven Rostedt (Google) <rostedt@goodmis.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/internal.h   |    4 ++++
 mm/page_alloc.c |    4 ++--
 2 files changed, 6 insertions(+), 2 deletions(-)

--- a/mm/internal.h~mm-fix-missing-handler-for-__gfp_nowarn-v2
+++ a/mm/internal.h
@@ -35,6 +35,10 @@ struct folio_batch;
 /* Do not use these with a slab allocator */
 #define GFP_SLAB_BUG_MASK (__GFP_DMA32|__GFP_HIGHMEM|~__GFP_BITS_MASK)
 
+/*
+ * Different from WARN_ON_ONCE(), no warning will be issued
+ * when we specify __GFP_NOWARN.
+ */
 #define WARN_ON_ONCE_GFP(cond, gfp)	({				\
 	static bool __section(".data.once") __warned;			\
 	int __ret_warn_once = !!(cond);					\
--- a/mm/page_alloc.c~mm-fix-missing-handler-for-__gfp_nowarn-v2
+++ a/mm/page_alloc.c
@@ -3712,7 +3712,7 @@ struct page *rmqueue(struct zone *prefer
 	 * We most definitely don't want callers attempting to
 	 * allocate greater than order-1 page units with __GFP_NOFAIL.
 	 */
-	WARN_ON_ONCE_GFP((gfp_flags & __GFP_NOFAIL) && (order > 1), gfp_flags);
+	WARN_ON_ONCE((gfp_flags & __GFP_NOFAIL) && (order > 1));
 
 	do {
 		page = NULL;
@@ -9022,7 +9022,7 @@ int __alloc_contig_migrate_range(struct
 
 	lru_cache_enable();
 	if (ret < 0) {
-		if (ret == -EBUSY)
+		if (!(cc->gfp_mask & __GFP_NOWARN) && ret == -EBUSY)
 			alloc_contig_dump_pages(&cc->migratepages);
 		putback_movable_pages(&cc->migratepages);
 		return ret;
_

Patches currently in -mm which might be from zhengqi.arch@bytedance.com are

mm-fix-missing-handler-for-__gfp_nowarn.patch
mm-fix-missing-handler-for-__gfp_nowarn-v2.patch
tty-fix-deadlock-caused-by-calling-printk-under-tty_port-lock.patch