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-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 7020217fc49..4e506d09e5f 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__)