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authorRussell King <rmk+kernel@arm.linux.org.uk>2009-11-09 23:53:29 +0000
committerRussell King <rmk+kernel@arm.linux.org.uk>2009-11-10 08:41:12 +0000
commitcc20d42986d5807cbe4f5c7c8e3dab2e59ea0db3 (patch)
treeaa71962250e2548a5079b5556436d924e14292fe /arch/arm/include
parentbfd2e29f04e5f048ea62677811d1244badd6661e (diff)
ARM: Use a definition for the userspace cmpxchg emulation syscall
Use a definition for the cmpxchg SWI instead of hard-coding the number. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Acked-by: Nicolas Pitre <nico@fluxnic.net>
Diffstat (limited to 'arch/arm/include')
-rw-r--r--arch/arm/include/asm/unistd.h9
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/arm/include/asm/unistd.h b/arch/arm/include/asm/unistd.h
index 7020217fc49f..4e506d09e5f9 100644
--- a/arch/arm/include/asm/unistd.h
+++ b/arch/arm/include/asm/unistd.h
@@ -403,6 +403,15 @@
#define __ARM_NR_set_tls (__ARM_NR_BASE+5)
/*
+ * *NOTE*: This is a ghost syscall private to the kernel. Only the
+ * __kuser_cmpxchg code in entry-armv.S should be aware of its
+ * existence. Don't ever use this from user code.
+ */
+#ifdef __KERNEL__
+#define __ARM_NR_cmpxchg (__ARM_NR_BASE+0x00fff0)
+#endif
+
+/*
* The following syscalls are obsolete and no longer available for EABI.
*/
#if defined(__ARM_EABI__) && !defined(__KERNEL__)