When CONFIG_ELF_CORE is disabled, we get a harmless warning in the compat
version of binfmt_elf:

fs/compat_binfmt_elf.c:58:13: error: 'cputime_to_compat_timeval' defined but 
not used [-Werror=unused-function]

This was addressed in mainline Linux as part of a larger rework with commit
cd19c364b313 ("fs/binfmt: Convert obsolete cputime type to nsecs").

For 4.9 and earlier, this just shuts up the warning by adding an #ifdef
around the function definition.

Signed-off-by: Arnd Bergmann <a...@arndb.de>
 fs/compat_binfmt_elf.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/compat_binfmt_elf.c b/fs/compat_binfmt_elf.c
index 4d24d17bcfc1..943be5ecfcd9 100644
--- a/fs/compat_binfmt_elf.c
+++ b/fs/compat_binfmt_elf.c
@@ -51,6 +51,7 @@
 #define elf_prstatus   compat_elf_prstatus
 #define elf_prpsinfo   compat_elf_prpsinfo
  * Compat version of cputime_to_compat_timeval, perhaps this
  * should be an inline in <linux/compat.h>.
@@ -63,6 +64,7 @@ static void cputime_to_compat_timeval(const cputime_t cputime,
        value->tv_sec = tv.tv_sec;
        value->tv_usec = tv.tv_usec;
 #undef cputime_to_timeval
 #define cputime_to_timeval cputime_to_compat_timeval

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