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selftests/mm: compaction_test: fix incorrect write of zero to nr_hugepages

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[ Upstream commit 9ad665ef55eaad1ead1406a58a34f615a7c18b5e ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Dev Jain 2024-05-21 13:13:57 +05:30 • committed by Ksawlii
parent 31e597a5ca
commit deb54bfe6e
1 changed files with 2 additions and 0 deletions
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2
tools/testing/selftests/vm/compaction_test.c
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@ -103,6 +103,8 @@ int check_compaction(unsigned long mem_free, unsigned int 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)) {
perror("Failed to write 0 to /proc/sys/vm/nr_hugepages\n");