linux-kernel - Re: build failure of malta_qemu_32r6

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Date:   Thu, 8 Apr 2021 09:42:11 +0800
From:   YunQiang Su <wzssyqa@...il.com>
To:     Sudip Mukherjee <sudipm.mukherjee@...il.com>
Cc:     Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        linux-mips <linux-mips@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: build failure of malta_qemu_32r6_defconfig

Sudip Mukherjee <sudipm.mukherjee@...il.com> 于2021年4月8日周四 上午2:26写道：
>
> 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_gettime':
> ./arch/mips/include/asm/vdso/gettimeofday.h:103:2: error: the register 'lo' 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_gettimeofday':
> ./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_getres':
> ./arch/mips/include/asm/vdso/gettimeofday.h:123:2: error: the register 'lo' cannot be clobbered in 'asm' for the current target
>   123 |  asm volatile(
>       |  ^~~
> ./arch/mips/include/asm/vdso/gettimeofday.h: In function '__vdso_clock_gettime64':
> ./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



-- 
YunQiang Su