Re: [PATCH v2 31/32] sh: support a 2-byte smp_store_mb

[Peter Zijlstra]

On Wed, Jan 06, 2016 at 06:53:01PM -0500, Rich Felker wrote:
> It would be nice to have these in asm-generic for archs which don't
> define their own versions rather than having cruft like this repeated
> per-arch. 

Maybe, but I'm not sure how many archs would indeed suffer this problem,
so far I'm only aware of Alpha and SH that do not have short atomic ops.

> Strictly speaking, the volatile u32 used to access the
> 32-bit word containing the u8 or u16 should be
> __attribute__((__may_alias__)) too. Is there an existing kernel type
> for a "may_alias u32" or should it perhaps be added?

The kernel does -fno-strict-aliasing because the C aliasing rules are
crap (TM) :-), so I suspect we do not need the alias attribute here.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/