linux-kernel - [RFC][PATCH 6/7] x86, mpx, selftests: Use prctl header instead of magic numbers

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Date:   Wed, 01 Feb 2017 15:24:16 -0800
From:   Dave Hansen <dave.hansen@...ux.intel.com>
To:     linux-kernel@...r.kernel.org
Cc:     linux-mm@...ck.org, x86@...nel.org,
        kirill.shutemov@...ux.intel.com,
        Dave Hansen <dave.hansen@...ux.intel.com>
Subject: [RFC][PATCH 6/7] x86, mpx, selftests: Use prctl header instead of magic numbers


I got away with just hard-coding the prctl() numbers in the MPX
selftests.  Include the kernel header so we can just use the
symbolic names.

---

 b/tools/testing/selftests/x86/mpx-mini-test.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff -puN tools/testing/selftests/x86/mpx-mini-test.c~mawa-068-selftests-inc tools/testing/selftests/x86/mpx-mini-test.c
--- a/tools/testing/selftests/x86/mpx-mini-test.c~mawa-068-selftests-inc	2017-02-01 15:12:18.083231385 -0800
+++ b/tools/testing/selftests/x86/mpx-mini-test.c	2017-02-01 15:12:18.087231565 -0800
@@ -40,6 +40,8 @@ int zap_all_every_this_many_mallocs = 10
 #include "mpx-debug.h"
 #include "mpx-mm.h"
 
+#include "../../../../include/uapi/linux/prctl.h"
+
 #ifndef __always_inline
 #define __always_inline inline __attribute__((always_inline)
 #endif
@@ -666,7 +668,7 @@ bool process_specific_init(void)
 	check_clear(dir, size);
 	enable_mpx(dir);
 	check_clear(dir, size);
-	if (prctl(43, 0, 0, 0, 0)) {
+	if (prctl(PR_MPX_ENABLE_MANAGEMENT, 0, 0, 0, 0)) {
 		printf("no MPX support\n");
 		abort();
 		return false;
@@ -676,7 +678,7 @@ bool process_specific_init(void)
 
 bool process_specific_finish(void)
 {
-	if (prctl(44)) {
+	if (prctl(PR_MPX_DISABLE_MANAGEMENT)) {
 		printf("no MPX support\n");
 		return false;
 	}
_