util: Fix mmio read on ARM

williamtu · nmorey · commit 8a739f651ae2 · 2025-04-23T11:45:11.000+02:00
[ Upstream commit d5e1802 ] Cast the addr to uint8_t pointer instead of uint32_t pointer. This fixes a SIGBUS error on ARM system. Fixes: 3f1f8d9 ("util: Add common mmio macros") Signed-off-by: William Tu <witu@nvidia.com> Signed-off-by: Nicolas Morey <nmorey@suse.com>
diff --git a/util/mmio.h b/util/mmio.h
@@ -158,7 +158,7 @@ static inline void mmio_write8(void *addr, uint8_t value)
 }
 static inline uint8_t mmio_read8(const void *addr)
 {
-	return atomic_load_explicit((_Atomic(uint32_t) *)addr,
+	return atomic_load_explicit((_Atomic(uint8_t) *)addr,
 				    memory_order_relaxed);
 }
 #endif /* __s390x__ */

Original file line number	Diff line number	Diff line change
`@@ -158,7 +158,7 @@ static inline void mmio_write8(void *addr, uint8_t value)`
`158`	`158`	`}`
`159`	`159`	`static inline uint8_t mmio_read8(const void *addr)`
`160`	`160`	`{`
`161`		`- return atomic_load_explicit((_Atomic(uint32_t) *)addr,`
	`161`	`+ return atomic_load_explicit((_Atomic(uint8_t) *)addr,`
`162`	`162`	`memory_order_relaxed);`
`163`	`163`	`}`
`164`	`164`	`#endif /* __s390x__ */`