arm64: percpu: Initialize ret in the default case

Clang warns that if the default case is taken, ret will be
uninitialized.

./arch/arm64/include/asm/percpu.h:196:2: warning: variable 'ret' is used
uninitialized whenever switch default is taken
[-Wsometimes-uninitialized]
        default:
        ^~~~~~~
./arch/arm64/include/asm/percpu.h:200:9: note: uninitialized use occurs
here
        return ret;
               ^~~
./arch/arm64/include/asm/percpu.h:157:19: note: initialize the variable
'ret' to silence this warning
        unsigned long ret, loop;
                         ^
                          = 0

This warning appears several times while building the erofs filesystem.
While it's not strictly wrong, the BUILD_BUG will prevent this from
becoming a true problem. Initialize ret to 0 in the default case right
before the BUILD_BUG to silence all of these warnings.

Reported-by: Prasad Sodagudi <psodagud@codeaurora.org>
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Dennis Zhou <dennis@kernel.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/arch/arm64/include/asm/percpu.h b/arch/arm64/include/asm/percpu.h
index 9234013e759e..21a81b59a0cc 100644
--- a/arch/arm64/include/asm/percpu.h
+++ b/arch/arm64/include/asm/percpu.h
@@ -96,6 +96,7 @@ static inline unsigned long __percpu_##op(void *ptr,			\
                 : [val] "Ir" (val));                                    \
                 break;                                                  \
         default:                                                        \
+                ret = 0;                                                \
                 BUILD_BUG();                                            \
         }                                                               \
                                                                         \
@@ -125,6 +126,7 @@ static inline unsigned long __percpu_read(void *ptr, int size)
                 ret = READ_ONCE(*(u64 *)ptr);
                 break;
         default:
+                ret = 0;
                 BUILD_BUG();
         }
 
@@ -194,6 +196,7 @@ static inline unsigned long __percpu_xchg(void *ptr, unsigned long val,
                 : [val] "r" (val));
                 break;
         default:
+                ret = 0;
                 BUILD_BUG();
         }