[patch 106/127] selftests/vm/pkeys: make gcc check arguments of sigsafe_printf()

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From: Thiago Jung Bauermann <bauerman@xxxxxxxxxxxxx>
Subject: selftests/vm/pkeys: make gcc check arguments of sigsafe_printf()

This will help us ensure we print pkey_reg_t values correctly in different
architectures.

Link: http://lkml.kernel.org/r/b40b7a95fdd4045d62530a2a34452934caf3b0bc.1585646528.git.sandipan@xxxxxxxxxxxxx
Signed-off-by: Thiago Jung Bauermann <bauerman@xxxxxxxxxxxxx>
Signed-off-by: Sandipan Das <sandipan@xxxxxxxxxxxxx>
Acked-by: Dave Hansen <dave.hansen@xxxxxxxxx>
Cc: "Desnes A. Nunes do Rosario" <desnesn@xxxxxxxxxxxxxxxxxx>
Cc: Florian Weimer <fweimer@xxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Ram Pai <linuxram@xxxxxxxxxx>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@xxxxxxxxxxxxx>
Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
Cc: Michal Suchanek <msuchanek@xxxxxxx>
Cc: Shuah Khan <shuah@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 tools/testing/selftests/vm/pkey-helpers.h |    4 ++++
 1 file changed, 4 insertions(+)

--- a/tools/testing/selftests/vm/pkey-helpers.h~selftests-vm-pkeys-make-gcc-check-arguments-of-sigsafe_printf
+++ a/tools/testing/selftests/vm/pkey-helpers.h
@@ -27,6 +27,10 @@
 #define DPRINT_IN_SIGNAL_BUF_SIZE 4096
 extern int dprint_in_signal;
 extern char dprint_in_signal_buffer[DPRINT_IN_SIGNAL_BUF_SIZE];
+
+#ifdef __GNUC__
+__attribute__((format(printf, 1, 2)))
+#endif
 static inline void sigsafe_printf(const char *format, ...)
 {
 	va_list ap;
_




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