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[PATCH] arm: Re-enable PI futex support for ARM kernels >= 3.14.3
- From: gratian dot crisan at ni dot com
- To: libc-alpha at sourceware dot org
- Cc: Joseph Myers <joseph at codesourcery dot com>, gratian at gmail dot com
- Date: Mon, 27 Oct 2014 14:17:53 -0500
- Subject: [PATCH] arm: Re-enable PI futex support for ARM kernels >= 3.14.3
- Authentication-results: sourceware.org; auth=none
From: Gratian Crisan <gratian.crisan@ni.com>
ARM linux kernels before 3.14.3 may or may not support
futex_atomic_cmpxchg_inatomic depending on the kernel configuration (e.g.
CONFIG_CPU_USE_DOMAINS && CONFIG_SMP configuration was not supported)
Starting with 3.14.3 the linux kernel unconditionally enables support for
ARM, and this re-enables the relevant __ASSUME_* macros.
Tested on ARM both with kernels >= 3.14.3 and older kernels.
Signed-off-by: Gratian Crisan <gratian.crisan@ni.com>
---
ChangeLog:
2014-10-27 Gratian Crisan <gratian.crisan@ni.com>
* sysdeps/unix/sysv/linux/arm/kernel-features.h
[__LINUX_KERNEL_VERSION < 0x030E03] (__ASSUME_FUTEX_LOCK_PI): Undefine.
[__LINUX_KERNEL_VERSION < 0x030E03] (__ASSUME_REQUEUE_PI): Likewise.
[__LINUX_KERNEL_VERSION < 0x030E03] (__ASSUME_SET_ROBUST_LIST):
Likewise.
---
sysdeps/unix/sysv/linux/arm/kernel-features.h | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/sysdeps/unix/sysv/linux/arm/kernel-features.h b/sysdeps/unix/sysv/linux/arm/kernel-features.h
index e755741..84d9e9d 100644
--- a/sysdeps/unix/sysv/linux/arm/kernel-features.h
+++ b/sysdeps/unix/sysv/linux/arm/kernel-features.h
@@ -34,9 +34,11 @@
#include_next <kernel-features.h>
-/* The ARM kernel may or may not support
+/* The ARM kernel before 3.14.3 may or may not support
futex_atomic_cmpxchg_inatomic, depending on kernel
configuration. */
-#undef __ASSUME_FUTEX_LOCK_PI
-#undef __ASSUME_REQUEUE_PI
-#undef __ASSUME_SET_ROBUST_LIST
+#if __LINUX_KERNEL_VERSION < 0x030E03
+# undef __ASSUME_FUTEX_LOCK_PI
+# undef __ASSUME_REQUEUE_PI
+# undef __ASSUME_SET_ROBUST_LIST
+#endif
--
2.1.1