+ tools-mm-fix-undefined-reference-to-pthread_once.patch added to mm-hotfixes-unstable branch

+ tools-mm-fix-undefined-reference-to-pthread_once.patch added to mm-hotfixes-unstable branch

[Andrew Morton]

The patch titled
     Subject: tools/mm: fix undefined reference to pthread_once
has been added to the -mm mm-hotfixes-unstable branch.  Its filename is
     tools-mm-fix-undefined-reference-to-pthread_once.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/tools-mm-fix-undefined-reference-to-pthread_once.patch

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

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------------------------------------------------------
From: Xie XiuQi <xiexiuqi@huawei.com>
Subject: tools/mm: fix undefined reference to pthread_once
Date: Thu, 31 Aug 2023 11:42:05 +0800

Commit 97d5f2e9ee12 ("tools api fs: More thread safety for global
filesystem variables") introduces pthread_once, so the libpthread
should be added at link time, or we'll meet the following compile
error when 'make -C tools/mm':

  gcc -Wall -Wextra -I../lib/ -o page-types page-types.c ../lib/api/libapi.a
  ~/linux/tools/lib/api/fs/fs.c:146: undefined reference to `pthread_once'
  ~/linux/tools/lib/api/fs/fs.c:147: undefined reference to `pthread_once'
  ~/linux/tools/lib/api/fs/fs.c:148: undefined reference to `pthread_once'
  ~/linux/tools/lib/api/fs/fs.c:149: undefined reference to `pthread_once'
  ~/linux/tools/lib/api/fs/fs.c:150: undefined reference to `pthread_once'
  /usr/bin/ld: ../lib/api/libapi.a(libapi-in.o):~/linux/tools/lib/api/fs/fs.c:151:
  more undefined references to `pthread_once' follow
  collect2: error: ld returned 1 exit status
  make: *** [Makefile:22: page-types] Error 1

Link: https://lkml.kernel.org/r/20230831034205.2376653-1-xiexiuqi@huaweicloud.com
Fixes: 97d5f2e9ee12 ("tools api fs: More thread safety for global filesystem variables")
Signed-off-by: Xie XiuQi <xiexiuqi@huawei.com>
Acked-by: Ian Rogers <irogers@google.com>
Cc: Matthew Wilcox <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 tools/mm/Makefile |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/tools/mm/Makefile~tools-mm-fix-undefined-reference-to-pthread_once
+++ a/tools/mm/Makefile
@@ -8,8 +8,8 @@ TARGETS=page-types slabinfo page_owner_s
 LIB_DIR = ../lib/api
 LIBS = $(LIB_DIR)/libapi.a
 
-CFLAGS += -Wall -Wextra -I../lib/
-LDFLAGS += $(LIBS)
+CFLAGS += -Wall -Wextra -I../lib/ -pthread
+LDFLAGS += $(LIBS) -pthread
 
 all: $(TARGETS)
 
_

Patches currently in -mm which might be from xiexiuqi@huawei.com are

tools-mm-fix-undefined-reference-to-pthread_once.patch