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-rw-r--r--include/linux/compiler.h16
1 files changed, 0 insertions, 16 deletions
diff --git a/include/linux/compiler.h b/include/linux/compiler.h
index 1b45e4a0519b..0e41ca0e5927 100644
--- a/include/linux/compiler.h
+++ b/include/linux/compiler.h
@@ -192,29 +192,16 @@ void ftrace_likely_update(struct ftrace_branch_data *f, int val, int expect);
192 192
193#include <uapi/linux/types.h> 193#include <uapi/linux/types.h>
194 194
195static __always_inline void data_access_exceeds_word_size(void)
196#ifdef __compiletime_warning
197__compiletime_warning("data access exceeds word size and won't be atomic")
198#endif
199;
200
201static __always_inline void data_access_exceeds_word_size(void)
202{
203}
204
205static __always_inline void __read_once_size(const volatile void *p, void *res, int size) 195static __always_inline void __read_once_size(const volatile void *p, void *res, int size)
206{ 196{
207 switch (size) { 197 switch (size) {
208 case 1: *(__u8 *)res = *(volatile __u8 *)p; break; 198 case 1: *(__u8 *)res = *(volatile __u8 *)p; break;
209 case 2: *(__u16 *)res = *(volatile __u16 *)p; break; 199 case 2: *(__u16 *)res = *(volatile __u16 *)p; break;
210 case 4: *(__u32 *)res = *(volatile __u32 *)p; break; 200 case 4: *(__u32 *)res = *(volatile __u32 *)p; break;
211#ifdef CONFIG_64BIT
212 case 8: *(__u64 *)res = *(volatile __u64 *)p; break; 201 case 8: *(__u64 *)res = *(volatile __u64 *)p; break;
213#endif
214 default: 202 default:
215 barrier(); 203 barrier();
216 __builtin_memcpy((void *)res, (const void *)p, size); 204 __builtin_memcpy((void *)res, (const void *)p, size);
217 data_access_exceeds_word_size();
218 barrier(); 205 barrier();
219 } 206 }
220} 207}
@@ -225,13 +212,10 @@ static __always_inline void __write_once_size(volatile void *p, void *res, int s
225 case 1: *(volatile __u8 *)p = *(__u8 *)res; break; 212 case 1: *(volatile __u8 *)p = *(__u8 *)res; break;
226 case 2: *(volatile __u16 *)p = *(__u16 *)res; break; 213 case 2: *(volatile __u16 *)p = *(__u16 *)res; break;
227 case 4: *(volatile __u32 *)p = *(__u32 *)res; break; 214 case 4: *(volatile __u32 *)p = *(__u32 *)res; break;
228#ifdef CONFIG_64BIT
229 case 8: *(volatile __u64 *)p = *(__u64 *)res; break; 215 case 8: *(volatile __u64 *)p = *(__u64 *)res; break;
230#endif
231 default: 216 default:
232 barrier(); 217 barrier();
233 __builtin_memcpy((void *)p, (const void *)res, size); 218 __builtin_memcpy((void *)p, (const void *)res, size);
234 data_access_exceeds_word_size();
235 barrier(); 219 barrier();
236 } 220 }
237} 221}