On Wed, Mar 14, 2012 at 4:19 PM, H. Peter Anvin <hpa@xxxxxxxxx> wrote: > On 03/14/2012 04:17 PM, H.J. Lu wrote: >> >> Just for the record, although the offsets of _utime and _stime are >> multiple of 8 bytes, struct siginfo is only aligned at 4 bytes. So >> the addresses of _utime and _stime may not be 8byte aligned. >> But misaligned int64 load/store are OK for x86-64. >> > > Yes; the real question I guess is where struct siginfo appears and if it > is misaligned by construction. It obviously appears in the signal stack > frame but also in a couple of system calls. It might be possible to put > an __attribute__((aligned(8))) on the whole structure in the x32 case? It is possible to add __attribute__((aligned(8))) on struct siginfo in the x32 case. But it only affects system calls with struct siginfo. The signal stack frame may still be misaligned. -- H.J. -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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