linux-kernel - [PATCH] selftests: timens: Fix gettime

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Date:   Wed, 31 Mar 2021 13:59:17 +0000 (UTC)
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Shuah Khan <shuah@...nel.org>, Andrei Vagin <avagin@...il.com>,
        Dmitry Safonov <dima@...sta.com>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-kselftest@...r.kernel.org
Subject: [PATCH] selftests: timens: Fix gettime_perf to work on powerpc

On powerpc:
- VDSO library is named linux-vdso32.so.1 or linux-vdso64.so.1
- clock_gettime is named __kernel_clock_gettime()

Ensure gettime_perf tries these names before giving up.

Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
---
 tools/testing/selftests/timens/gettime_perf.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/tools/testing/selftests/timens/gettime_perf.c b/tools/testing/selftests/timens/gettime_perf.c
index 7bf841a3967b..6b13dc277724 100644
--- a/tools/testing/selftests/timens/gettime_perf.c
+++ b/tools/testing/selftests/timens/gettime_perf.c
@@ -25,12 +25,20 @@ static void fill_function_pointers(void)
 	if (!vdso)
 		vdso = dlopen("linux-gate.so.1",
 			      RTLD_LAZY | RTLD_LOCAL | RTLD_NOLOAD);
+	if (!vdso)
+		vdso = dlopen("linux-vdso32.so.1",
+			      RTLD_LAZY | RTLD_LOCAL | RTLD_NOLOAD);
+	if (!vdso)
+		vdso = dlopen("linux-vdso64.so.1",
+			      RTLD_LAZY | RTLD_LOCAL | RTLD_NOLOAD);
 	if (!vdso) {
 		pr_err("[WARN]\tfailed to find vDSO\n");
 		return;
 	}
 
 	vdso_clock_gettime = (vgettime_t)dlsym(vdso, "__vdso_clock_gettime");
+	if (!vdso_clock_gettime)
+		vdso_clock_gettime = (vgettime_t)dlsym(vdso, "__kernel_clock_gettime");
 	if (!vdso_clock_gettime)
 		pr_err("Warning: failed to find clock_gettime in vDSO\n");
 
-- 
2.25.0