When building on OpenBSD/arm64 with clang 15, unaligned access
warnings are seen when a union is embedded inside a packed struct.
drm/amd/display/dmub/inc/dmub_cmd.h:941:18: error: field
cursor_copy_src within 'struct dmub_rb_cmd_mall' is less aligned than
'union dmub_addr' and is usually due to 'struct dmub_rb_cmd_mall'
being packed, which can lead to unaligned accesses
[-Werror,-Wunaligned-access]
union dmub_addr cursor_copy_src; /**< Cursor copy address */
^
drm/amd/display/dmub/inc/dmub_cmd.h:942:18: error: field cursor_copy_dst
within 'struct dmub_rb_cmd_mall' is less aligned than
'union dmub_addr' and is usually due to 'struct dmub_rb_cmd_mall'
being packed, which can lead to unaligned accesses
[-Werror,-Wunaligned-access]
union dmub_addr cursor_copy_dst; /**< Cursor copy destination */
^
Add pragma pack around dmub_addr to avoid this.
Signed-off-by: Jonathan Gray <jsg@xxxxxxxxx>
---
drivers/gpu/drm/amd/display/dmub/inc/dmub_cmd.h | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/gpu/drm/amd/display/dmub/inc/dmub_cmd.h b/drivers/gpu/drm/amd/display/dmub/inc/dmub_cmd.h
index 33907feefebb..dc92d06572a3 100644
--- a/drivers/gpu/drm/amd/display/dmub/inc/dmub_cmd.h
+++ b/drivers/gpu/drm/amd/display/dmub/inc/dmub_cmd.h
@@ -162,6 +162,7 @@ extern "C" {
#define dmub_udelay(microseconds) udelay(microseconds)
#endif
+#pragma pack(push, 1)
/**
* union dmub_addr - DMUB physical/virtual 64-bit address.
*/
@@ -172,6 +173,7 @@ union dmub_addr {
} u; /*<< Low/high bit access */
uint64_t quad_part; /*<< 64 bit address */
};
+#pragma pack(pop)
/**
* Dirty rect definition.
--
2.39.1
