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From:   YunQiang Su <wzssyqa@gmail.com>
Date:   Thu, 8 Apr 2021 09:42:11 +0800
Message-ID: <CAKcpw6VrbA2+mq42=0FjE7Y9e6OM-Q9WxvYPWtAF4t0hRWKB1A@mail.gmail.com>
Subject: Re: build failure of malta_qemu_32r6_defconfig
To:     Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Cc:     Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
        linux-mips <linux-mips@vger.kernel.org>,
        LKML <linux-kernel@vger.kernel.org>
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Sudip Mukherjee <sudipm.mukherjee@gmail.com> =E4=BA=8E2021=E5=B9=B44=E6=9C=
=888=E6=97=A5=E5=91=A8=E5=9B=9B =E4=B8=8A=E5=8D=882:26=E5=86=99=E9=81=93=EF=
=BC=9A
>
> Hi Thomas,
>
> I was building v5.10.28 with malta_qemu_32r6_defconfig and noticed that
> it fails to build, so tried next-20210407 to see if it has been fixed.
> But linux-next also has the issue with gcc-10.
>
> The error is:
>
> ./arch/mips/include/asm/vdso/gettimeofday.h: In function '__vdso_clock_ge=
ttime':
> ./arch/mips/include/asm/vdso/gettimeofday.h:103:2: error: the register 'l=
o' cannot be clobbered in 'asm' for the current target
>   103 |  asm volatile(
>       |  ^~~

this operation try to save lo and hi register, while they are not
exisiting on r6.
We are working on figure out a patch for it.

> ./arch/mips/include/asm/vdso/gettimeofday.h: In function '__vdso_gettimeo=
fday':
> ./arch/mips/include/asm/vdso/gettimeofday.h:33:2: error: the register 'lo=
' cannot be clobbered in 'asm' for the current target
>    33 |  asm volatile(
>       |  ^~~
> ./arch/mips/include/asm/vdso/gettimeofday.h: In function '__vdso_clock_ge=
tres':
> ./arch/mips/include/asm/vdso/gettimeofday.h:123:2: error: the register 'l=
o' cannot be clobbered in 'asm' for the current target
>   123 |  asm volatile(
>       |  ^~~
> ./arch/mips/include/asm/vdso/gettimeofday.h: In function '__vdso_clock_ge=
ttime64':
> ./arch/mips/include/asm/vdso/gettimeofday.h:57:2: error: the register 'lo=
' cannot be clobbered in 'asm' for the current target
>    57 |  asm volatile(
>       |  ^~~
>
> Any idea how to fix this? Please ignore if it has been reported before.
>
>
> --
> Regards
> Sudip


--=20
YunQiang Su