linux-kernel - Re: [PATCH v1 3/8] selftests/nolibc: select

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Date:   Wed, 19 Jul 2023 14:49:12 +0800
From:   Zhangjin Wu <falcon@...ylab.org>
To:     w@....eu
Cc:     arnd@...db.de, falcon@...ylab.org, linux-kernel@...r.kernel.org,
        linux-kselftest@...r.kernel.org, thomas@...ch.de
Subject: Re: [PATCH v1 3/8] selftests/nolibc: select_null: fix up for big endian powerpc64

Hi, Willy

> Hi Zhangjin,
> 
> On Wed, Jul 19, 2023 at 07:56:37AM +0800, Zhangjin Wu wrote:
> > It made me recalled I have at last disabled (not enabled for tinyconfig) the following options:
> > 
> >     CONFIG_ALTIVEC
> >     CONFIG_VSX --> This option enables kernel support for the Vector Scaler extensions
> > 
> > Or we can disable the vsx instructions explicitly:
> > 
> >     -mno-vsx
> > 
> > Both of them work well, but I prefer -mno-vsx for to get a faster build, what about you?
> > 
> >     +CFLAGS_powerpc64 = -m64 -mbig-endian -Wl,-EB,-melf64ppc -mno-vsx
> >     +CFLAGS_powerpc64le = -m64 -mlittle-endian -Wl,-EL,-melf64ppc -mno-vsx
> > 
> > So, this patch itself is wrong, let's drop it from the next revision.
> 
> Better explicitly disable it in the CFLAGS (2nd option) if we want to
> make sure we don't want to rely on this, at least for portability
> purposes.

Ok, thanks, have updated CFLAGS in these two patches locally:

    [PATCH v1 7/8] selftests/nolibc: add test support for powerpc64le
    [PATCH v1 8/8] selftests/nolibc: add test support for powerpc64

what about the other ones? I'm ready to send v2 ;-)

Best regards,
Zhangjin

> 
> Willy