kernel: make READ_ONCE() valid on const arguments

[cascardo/linux.git] / include / linux / compiler.h

diff --git a/include/linux/compiler.h b/include/linux/compiler.h
index d1ec10a..1b45e4a 100644 (file)
--- a/include/linux/compiler.h
+++ b/include/linux/compiler.h
@@ -202,7 +202,7 @@ static __always_inline void data_access_exceeds_word_size(void)
 {
 }
 
-static __always_inline void __read_once_size(volatile void *p, void *res, int size)
+static __always_inline void __read_once_size(const volatile void *p, void *res, int size)
 {
        switch (size) {
        case 1: *(__u8 *)res = *(volatile __u8 *)p; break;
@@ -259,10 +259,10 @@ static __always_inline void __write_once_size(volatile void *p, void *res, int s
  */
 
 #define READ_ONCE(x) \
-       ({ typeof(x) __val; __read_once_size(&x, &__val, sizeof(__val)); __val; })
+       ({ union { typeof(x) __val; char __c[1]; } __u; __read_once_size(&(x), __u.__c, sizeof(x)); __u.__val; })
 
 #define WRITE_ONCE(x, val) \
-       ({ typeof(x) __val; __val = val; __write_once_size(&x, &__val, sizeof(__val)); __val; })
+       ({ typeof(x) __val = (val); __write_once_size(&(x), &__val, sizeof(__val)); __val; })
 
 #endif /* __KERNEL__ */