linux-kernel - [PATCH v4 4/7] selftests/resctrl: Move _GNU

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Message-Id: <20231002094813.6633-5-ilpo.jarvinen@linux.intel.com>
Date:   Mon,  2 Oct 2023 12:48:10 +0300
From:   Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To:     linux-kselftest@...r.kernel.org, Shuah Khan <shuah@...nel.org>,
        Reinette Chatre <reinette.chatre@...el.com>,
        Maciej Wieczór-Retman 
        <maciej.wieczor-retman@...el.com>,
        Shaopeng Tan <tan.shaopeng@...fujitsu.com>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Subject: [PATCH v4 4/7] selftests/resctrl: Move _GNU_SOURCE define into Makefile

_GNU_SOURCE is defined in resctrl.h. Defining _GNU_SOURCE has a large
impact on what gets defined when including headers either before or
after it. This can result in compile failures if .c file decides to
include a standard header file before resctrl.h.

It is safer to define _GNU_SOURCE in Makefile so it is always defined
regardless of in which order includes are done.

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Tested-by: Shaopeng Tan <tan.shaopeng@...fujitsu.com>
Reviewed-by: Reinette Chatre <reinette.chatre@...el.com>
Reviewed-by: Shaopeng Tan <tan.shaopeng@...fujitsu.com>
Cc: <stable@...r.kernel.org>
---
 tools/testing/selftests/resctrl/Makefile  | 2 +-
 tools/testing/selftests/resctrl/resctrl.h | 1 -
 2 files changed, 1 insertion(+), 2 deletions(-)

diff --git a/tools/testing/selftests/resctrl/Makefile b/tools/testing/selftests/resctrl/Makefile
index 5073dbc96125..2deac2031de9 100644
--- a/tools/testing/selftests/resctrl/Makefile
+++ b/tools/testing/selftests/resctrl/Makefile
@@ -1,6 +1,6 @@
 # SPDX-License-Identifier: GPL-2.0
 
-CFLAGS = -g -Wall -O2 -D_FORTIFY_SOURCE=2
+CFLAGS = -g -Wall -O2 -D_FORTIFY_SOURCE=2 -D_GNU_SOURCE
 CFLAGS += $(KHDR_INCLUDES)
 
 TEST_GEN_PROGS := resctrl_tests
diff --git a/tools/testing/selftests/resctrl/resctrl.h b/tools/testing/selftests/resctrl/resctrl.h
index dd07463cdf48..d9b5df95849d 100644
--- a/tools/testing/selftests/resctrl/resctrl.h
+++ b/tools/testing/selftests/resctrl/resctrl.h
@@ -1,5 +1,4 @@
 /* SPDX-License-Identifier: GPL-2.0 */
-#define _GNU_SOURCE
 #ifndef RESCTRL_H
 #define RESCTRL_H
 #include <stdio.h>
-- 
2.30.2