FAILED: patch "[PATCH] selftests/mm: compaction_test: fix incorrect write of zero to" failed to apply to 5.15-stable tree

FAILED: patch "[PATCH] selftests/mm: compaction_test: fix incorrect write of zero to" failed to apply to 5.15-stable tree

[gregkh]

The patch below does not apply to the 5.15-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y
git checkout FETCH_HEAD
git cherry-pick -x 9ad665ef55eaad1ead1406a58a34f615a7c18b5e
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2024061331-trilogy-bulk-6fc0@gregkh' --subject-prefix 'PATCH 5.15.y' HEAD^..

Possible dependencies:

9ad665ef55ea ("selftests/mm: compaction_test: fix incorrect write of zero to nr_hugepages")

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 9ad665ef55eaad1ead1406a58a34f615a7c18b5e Mon Sep 17 00:00:00 2001
From: Dev Jain <dev.jain@arm.com>
Date: Tue, 21 May 2024 13:13:57 +0530
Subject: [PATCH] selftests/mm: compaction_test: fix incorrect write of zero to
 nr_hugepages

Currently, the test tries to set nr_hugepages to zero, but that is not
actually done because the file offset is not reset after read().  Fix that
using lseek().

Link: https://lkml.kernel.org/r/20240521074358.675031-3-dev.jain@arm.com
Fixes: bd67d5c15cc1 ("Test compaction of mlocked memory")
Signed-off-by: Dev Jain <dev.jain@arm.com>
Cc: <stable@vger.kernel.org>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Sri Jayaramappa <sjayaram@akamai.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/tools/testing/selftests/mm/compaction_test.c b/tools/testing/selftests/mm/compaction_test.c
index 0b249a06a60b..5e9bd1da9370 100644
--- a/tools/testing/selftests/mm/compaction_test.c
+++ b/tools/testing/selftests/mm/compaction_test.c
@@ -108,6 +108,8 @@ int check_compaction(unsigned long mem_free, unsigned long hugepage_size)
 		goto close_fd;
 	}
 
+	lseek(fd, 0, SEEK_SET);
+
 	/* Start with the initial condition of 0 huge pages*/
 	if (write(fd, "0", sizeof(char)) != sizeof(char)) {
 		ksft_print_msg("Failed to write 0 to /proc/sys/vm/nr_hugepages: %s\n",