selftests/vm/compaction_test: fix write to restore nr_hugepages

The write at the end of the test to restore nr_hugepages to its previous
value is failing.  This is because it is trying to write the number of
bytes in the char array as opposed to the number of bytes in the string.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Mike Kravetz <[email protected]>
Cc: Shuah Khan <[email protected]>
Cc: Sri Jayaramappa <[email protected]>
Cc: Eric B Munson <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

diff --git a/tools/testing/selftests/vm/compaction_test.c b/tools/testing/selftests/vm/compaction_test.c
index 932ff577ffc0b01405c1a264bbfc36b2baa8c058..00c4f65d12daf995123cdaaf9ef3e53cbe2e18eb 100644 (file)
--- a/tools/testing/selftests/vm/compaction_test.c
+++ b/tools/testing/selftests/vm/compaction_test.c
@@ -136,7 +136,7 @@ int check_compaction(unsigned long mem_free, unsigned int hugepage_size)
        printf("No of huge pages allocated = %d\n",
               (atoi(nr_hugepages)));
 
-       if (write(fd, initial_nr_hugepages, sizeof(initial_nr_hugepages))
+       if (write(fd, initial_nr_hugepages, strlen(initial_nr_hugepages))
            != strlen(initial_nr_hugepages)) {
                perror("Failed to write to /proc/sys/vm/nr_hugepages\n");
                goto close_fd;