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selftests/mlock2: add missing #define _GNU_SOURCE

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On glibc 2.3.6:

    mlock2-tests.c: In function 'seek_to_smaps_entry':
    mlock2-tests.c:158: warning: implicit declaration of function 'getline'

According to the manpage of getline(), it needs _GNU_SOURCE before glibc
2.10.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Eric B Munson <emunson@akamai.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Geert Uytterhoeven 2015-11-10 14:45:06 -08:00 committed by Linus Torvalds
parent 42d4ebb42a
commit 60997feb14
1 changed files with 1 additions and 0 deletions
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tools/testing/selftests/vm/mlock2-tests.c
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@ -1,3 +1,4 @@
#define _GNU_SOURCE
#include <sys/mman.h>
#include <stdint.h>
#include <stdio.h>