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authorGratian Crisan <gratian.crisan@ni.com>2014-10-27 22:45:43 +0000
committerJoseph Myers <joseph@codesourcery.com>2014-10-27 22:45:43 +0000
commit03d41216fe09fc71a2750946af8fe2892bf4feb5 (patch)
treeae838a6041d628e440af1903b7b3bb6ba117e5ad /sysdeps/unix/sysv
parenta4b3624d20e90e8255fb82a83ff40e9e178e0aef (diff)
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arm: Re-enable PI futex support for ARM kernels >= 3.14.3
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.

	* sysdeps/unix/sysv/linux/arm/kernel-features.h
	[__LINUX_KERNEL_VERSION >= 0x030E03] (__ASSUME_FUTEX_LOCK_PI): Do
	not undefine.
	[__LINUX_KERNEL_VERSION >= 0x030E03] (__ASSUME_REQUEUE_PI):
	Likewise.
	[__LINUX_KERNEL_VERSION >= 0x030E03] (__ASSUME_SET_ROBUST_LIST):
	Likewise.
Diffstat (limited to 'sysdeps/unix/sysv')
-rw-r--r--sysdeps/unix/sysv/linux/arm/kernel-features.h10
1 files 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 e755741de6..84d9e9d7aa 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