On Wed, May 13, 2026 at 09:37:11AM +0200, Peter Zijlstra wrote:
> On Tue, May 12, 2026 at 08:33:45PM -0700, Josh Poimboeuf wrote:
> > arm64 can have empty alternatives, which are effectively no-ops. Ignore
> > them. While at it, fix a memory leak.
>
> How does this happen?
Yeah, that commit log sucks...
The case I stumbled on was the dcache_by_myline_op_nosync macro:
alternative_if ARM64_WORKAROUND_4311569
.ifnc \op, cvau
mov \start, \tmp
mov \tmp, xzr
cbnz \start, .Ldcache_op\@
.endif
alternative_else_nop_endif
That's actually a bit weird, the .ifnc should probably be outside the
alternative_if. Let me try fixing that instead.
--
Josh
