linux-kernel - Re: [PATCH] ARM: kexec: drop invalid assembly argument

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Date:   Fri, 21 Feb 2020 13:09:36 -0800
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Stefan Agner <stefan@...er.ch>
Cc:     clang-built-linux <clang-built-linux@...glegroups.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Russell King - ARM Linux admin <linux@...linux.org.uk>
Subject: Re: [PATCH] ARM: kexec: drop invalid assembly argument

On Wed, Feb 5, 2020 at 3:54 PM Russell King - ARM Linux admin
<linux@...linux.org.uk> wrote:
>
> On Wed, Feb 05, 2020 at 11:59:26PM +0100, Stefan Agner wrote:
> > The tst menomic has only a single #<const> argument in Thumb mode. There
> > is an ARM variant which allows to write #<const> as #<byte>, #<rot>
> > which probably is where the current syntax comes from.
> >
> > It seems that binutils does not care about the additional parameter.
> > Clang however complains in Thumb2 mode:
> > arch/arm/kernel/relocate_kernel.S:28:12: error: too many operands for
> > instruction
> >  tst r3,#1,0
> >            ^
> >
> > Drop the unnecessary parameter. This fixes building this file in Thumb2
> > mode with the Clang integrated assembler.
> >
> > Link: https://github.com/ClangBuiltLinux/linux/issues/770
> > Signed-off-by: Stefan Agner <stefan@...er.ch>
>
> Please drop it in the patch system, thanks.

Hi Stefan, did you add this to the patch tracking system? Looks like a
bunch got accepted, but I didn't see it in:
https://www.armlinux.org.uk/developer/patches/section.php?section=20&page=132

>
> > ---
> >  arch/arm/kernel/relocate_kernel.S | 8 ++++----
> >  1 file changed, 4 insertions(+), 4 deletions(-)
> >
> > diff --git a/arch/arm/kernel/relocate_kernel.S b/arch/arm/kernel/relocate_kernel.S
> > index 7eaa2ae7aff5..72a08786e16e 100644
> > --- a/arch/arm/kernel/relocate_kernel.S
> > +++ b/arch/arm/kernel/relocate_kernel.S
> > @@ -25,26 +25,26 @@ ENTRY(relocate_new_kernel)
> >       ldr     r3, [r0],#4
> >
> >       /* Is it a destination page. Put destination address to r4 */
> > -     tst     r3,#1,0
> > +     tst     r3,#1
> >       beq     1f
> >       bic     r4,r3,#1
> >       b       0b
> >  1:
> >       /* Is it an indirection page */
> > -     tst     r3,#2,0
> > +     tst     r3,#2
> >       beq     1f
> >       bic     r0,r3,#2
> >       b       0b
> >  1:
> >
> >       /* are we done ? */
> > -     tst     r3,#4,0
> > +     tst     r3,#4
> >       beq     1f
> >       b       2f
> >
> >  1:
> >       /* is it source ? */
> > -     tst     r3,#8,0
> > +     tst     r3,#8
> >       beq     0b
> >       bic r3,r3,#8
> >       mov r6,#1024
> > --
> > 2.25.0
> >
> >
> > _______________________________________________
> > linux-arm-kernel mailing list
> > linux-arm-kernel@...ts.infradead.org
> > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
> >
>
> --
> RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
> FTTC broadband for 0.8mile line in suburbia: sync at 12.1Mbps down 622kbps up
> According to speedtest.net: 11.9Mbps down 500kbps up
>
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-- 
Thanks,
~Nick Desaulniers

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