MIPS: Fall back to generic implementation of cmpxchg64 on 32-bit platforms

This is in preparation of adding HAVE_VIRT_CPU_ACCOUNTING_GEN support in
the next patch.

Without having cmpxchg64 to use the generic implementation, kernel linking
will complain:

kernel/built-in.o: In function `cputime_adjust':
cputime.c:(.text+0x33748): undefined reference to `__cmpxchg_called_with_bad_pointer'
cputime.c:(.text+0x33810): undefined reference to `__cmpxchg_called_with_bad_pointer'

Signed-off-by: Deng-Cheng Zhu <dengcheng.zhu@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: macro@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9474/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 6 insertions, 5 deletions

diff --git a/arch/mips/include/asm/cmpxchg.h b/arch/mips/include/asm/cmpxchg.h
index d0a2a68ca600..412f945f1f5e 100644
--- a/arch/mips/include/asm/cmpxchg.h
+++ b/arch/mips/include/asm/cmpxchg.h
@@ -229,21 +229,22 @@ extern void __cmpxchg_called_with_bad_pointer(void);
 #define cmpxchg(ptr, old, new)          __cmpxchg(ptr, old, new, smp_mb__before_llsc(), smp_llsc_mb())
 #define cmpxchg_local(ptr, old, new)    __cmpxchg(ptr, old, new, , )
 
-#define cmpxchg64(ptr, o, n)                                            \
+#ifdef CONFIG_64BIT
+#define cmpxchg64_local(ptr, o, n)                                      \
   ({                                                                    \
         BUILD_BUG_ON(sizeof(*(ptr)) != 8);                              \
-        cmpxchg((ptr), (o), (n));                                       \
+        cmpxchg_local((ptr), (o), (n));                                 \
   })
 
-#ifdef CONFIG_64BIT
-#define cmpxchg64_local(ptr, o, n)                                      \
+#define cmpxchg64(ptr, o, n)                                            \
   ({                                                                    \
         BUILD_BUG_ON(sizeof(*(ptr)) != 8);                              \
-        cmpxchg_local((ptr), (o), (n));                                 \
+        cmpxchg((ptr), (o), (n));                                       \
   })
 #else
 #include <asm-generic/cmpxchg-local.h>
 #define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
+#define cmpxchg64(ptr, o, n) cmpxchg64_local((ptr), (o), (n))
 #endif
 
 #endif /* __ASM_CMPXCHG_H */