linux-kernel - Re: [PATCH 4/8] s390/entry: workaround llvm's IAS limitations

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Date:   Thu, 12 May 2022 21:16:24 +0200
From:   Heiko Carstens <hca@...ux.ibm.com>
To:     Nathan Chancellor <nathan@...nel.org>
Cc:     Vasily Gorbik <gor@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Jonas Paulsson <paulsson@...ux.vnet.ibm.com>,
        Ulrich Weigand <ulrich.weigand@...ibm.com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Alexander Egorenkov <egorenar@...ux.ibm.com>,
        Sven Schnelle <svens@...ux.ibm.com>,
        Andreas Krebbel <krebbel@...ux.ibm.com>,
        Nathan Chancellor <natechancellor@...il.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org
Subject: Re: [PATCH 4/8] s390/entry: workaround llvm's IAS limitations

On Thu, May 12, 2022 at 12:06:59PM -0700, Nathan Chancellor wrote:
> > +#ifdef CONFIG_AS_IS_LLVM
> > +	clgfrl	%r14,.Lrange_size\@
> > +#else
> > +	clgfi	%r14,\end - \start
> > +#endif
> >  	jhe	\outside_label
> > +#ifdef CONFIG_CC_IS_CLANG
> 
> I think this one also wants to be CONFIG_AS_IS_LLVM, right?

Yes, of course.

> Other than that, seems fine to me, although I have no knowledge of s390
> assembly so that statement probably means next to nothing :)

Thanks for having a look! :)