The structure is packed, which requires that all its fields need to be also packed. ./include/uapi/linux/dvb/frontend.h:854:2: warning: field within 'struct dtv_stats' is less aligned than 'union dtv_stats::(anonymous at ./include/uapi/linux/dvb/frontend.h:854:2)' and is usually due to 'struct dtv_stats' being packed, which can lead to unaligned accesses [-Wunaligned-access] Explicitly set the inner union as packed. Marking the inner union as 'packed' does not change the layout, since the whole struct is already packed, it just silences the clang warning. See also this llvm discussion: https://github.com/llvm/llvm-project/issues/55520
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| @@ -854,7 +854,7 @@ struct dtv_stats { · 853 unmodified lines | ||
| 854 | 854 | union { |
| 855 | 855 | __u64 uvalue; /* for counters and relative scales */ |
| 856 | 856 | __s64 svalue; /* for 0.001 dB measures */ |
| 857 | − }; | |
| 857 | + } __attribute__ ((packed)); | |
| 858 | 858 | } __attribute__ ((packed)); |
| 859 | 859 | |
| 860 | 860 | |