The patch below does not apply to the 4.19-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-4.19.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 '2024061334-splinter-unshipped-1c3e@gregkh' --subject-prefix 'PATCH 4.19.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",