linux-kernel - [PATCH 1/9] KVM: selftests: Add pidfd

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Message-ID: <20250829142556.72577-2-aqibaf@amazon.com>
Date: Fri, 29 Aug 2025 14:25:45 +0000
From: Aqib Faruqui <aqibaf@...zon.com>
To: Kees Cook <kees@...nel.org>, Andy Lutomirski <luto@...capital.net>, "Will
 Drewry" <wad@...omium.org>, Shuah Khan <shuah@...nel.org>, Christian Brauner
	<brauner@...nel.org>, <linux-kselftest@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
CC: <nh-open-source@...zon.com>, <aqibaf@...zon.com>
Subject: [PATCH 1/9] KVM: selftests: Add pidfd_open syscall number fallback

The kselftest-harness uses pidfd_open() for test timeout handling, but
non-glibc C library headers may not define this syscall number.

Add architecture-specific fallback definitions to pidfd.h, including
support for Alpha (544) and other architectures (434). Update
kselftest_harness.h to include pidfd.h for the syscall definitions.

Signed-off-by: Aqib Faruqui <aqibaf@...zon.com>
---
 tools/testing/selftests/kselftest_harness.h | 1 +
 tools/testing/selftests/pidfd/pidfd.h       | 4 ++++
 2 files changed, 5 insertions(+)

diff --git a/tools/testing/selftests/kselftest_harness.h b/tools/testing/selftests/kselftest_harness.h
index 2925e47db..1dd3e5a1b 100644
--- a/tools/testing/selftests/kselftest_harness.h
+++ b/tools/testing/selftests/kselftest_harness.h
@@ -69,6 +69,7 @@
 #include <unistd.h>
 
 #include "kselftest.h"
+#include "pidfd/pidfd.h"
 
 #define TEST_TIMEOUT_DEFAULT 30
 
diff --git a/tools/testing/selftests/pidfd/pidfd.h b/tools/testing/selftests/pidfd/pidfd.h
index f87993def..c373ff18e 100644
--- a/tools/testing/selftests/pidfd/pidfd.h
+++ b/tools/testing/selftests/pidfd/pidfd.h
@@ -45,8 +45,12 @@
 #endif
 
 #ifndef __NR_pidfd_open
+#ifdef __alpha__
+#define __NR_pidfd_open 544
+#else
 #define __NR_pidfd_open 434
 #endif
+#endif
 
 #ifndef __NR_pidfd_send_signal
 #define __NR_pidfd_send_signal 424
-- 
2.47.3