[ARM] 5067/1: _raw_write_can_lock macro bugfix

[linux-2.6-omap-h63xx.git] / include / asm-arm / system.h

diff --git a/include/asm-arm/system.h b/include/asm-arm/system.h
index 94ea8c6dc1a4485014fd9bb8fbd7c29078e69696..514af792a5980bd384dc158124df7e9036bdc926 100644 (file)
--- a/include/asm-arm/system.h
+++ b/include/asm-arm/system.h
@@ -48,6 +48,22 @@
 #define CPUID_TCM      2
 #define CPUID_TLBTYPE  3
 
+/*
+ * This is used to ensure the compiler did actually allocate the register we
+ * asked it for some inline assembly sequences.  Apparently we can't trust
+ * the compiler from one version to another so a bit of paranoia won't hurt.
+ * This string is meant to be concatenated with the inline asm string and
+ * will cause compilation to stop on mismatch.
+ * (for details, see gcc PR 15089)
+ */
+#define __asmeq(x, y)  ".ifnc " x "," y " ; .err ; .endif\n\t"
+
+#ifndef __ASSEMBLY__
+
+#include <linux/linkage.h>
+#include <linux/stringify.h>
+#include <linux/irqflags.h>
+
 #ifdef CONFIG_CPU_CP15
 #define read_cpuid(reg)                                                        \
        ({                                                              \
@@ -59,23 +75,21 @@
                __val;                                                  \
        })
 #else
+extern unsigned int processor_id;
 #define read_cpuid(reg) (processor_id)
 #endif
 
 /*
- * This is used to ensure the compiler did actually allocate the register we
- * asked it for some inline assembly sequences.  Apparently we can't trust
- * the compiler from one version to another so a bit of paranoia won't hurt.
- * This string is meant to be concatenated with the inline asm string and
- * will cause compilation to stop on mismatch.
- * (for details, see gcc PR 15089)
+ * The CPU ID never changes at run time, so we might as well tell the
+ * compiler that it's constant.  Use this function to read the CPU ID
+ * rather than directly reading processor_id or read_cpuid() directly.
  */
-#define __asmeq(x, y)  ".ifnc " x "," y " ; .err ; .endif\n\t"
+static inline unsigned int read_cpuid_id(void) __attribute_const__;
 
-#ifndef __ASSEMBLY__
-
-#include <linux/linkage.h>
-#include <linux/irqflags.h>
+static inline unsigned int read_cpuid_id(void)
+{
+       return read_cpuid(CPUID_ID);
+}
 
 #define __exception    __attribute__((section(".exception.text")))
 
@@ -350,6 +364,21 @@ static inline unsigned long __xchg(unsigned long x, volatile void *ptr, int size
 extern void disable_hlt(void);
 extern void enable_hlt(void);
 
+#include <asm-generic/cmpxchg-local.h>
+
+/*
+ * cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make
+ * them available.
+ */
+#define cmpxchg_local(ptr, o, n)                                              \
+       ((__typeof__(*(ptr)))__cmpxchg_local_generic((ptr), (unsigned long)(o),\
+                       (unsigned long)(n), sizeof(*(ptr))))
+#define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
+
+#ifndef CONFIG_SMP
+#include <asm-generic/cmpxchg.h>
+#endif
+
 #endif /* __ASSEMBLY__ */
 
 #define arch_align_stack(x) (x)