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Date:   Thu, 16 Jul 2020 13:37:20 +0200
From:   peterz@infradead.org
To:     John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Cc:     Geert Uytterhoeven <geert@linux-m68k.org>,
        Rich Felker <dalias@libc.org>, Christoph Hellwig <hch@lst.de>,
        Yoshinori Sato <ysato@users.sourceforge.jp>,
        Linux-sh list <linux-sh@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: ioremap and dma cleanups and fixes for superh (2nd resend)
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On Thu, Jul 16, 2020 at 01:03:36PM +0200, John Paul Adrian Glaubitz wrote:
> Hi Peter!
> 
> On 7/16/20 1:01 PM, peterz@infradead.org wrote:
> >> The build fails with:
> >>
> >>   CC      mm/mmu_gather.o
> >> mm/mmu_gather.c: In function ‘tlb_table_invalidate’:
> >> mm/mmu_gather.c:180:6: error: implicit declaration of function ‘tlb_needs_table_invalidate’; did you mean ‘tlb_table_invalidate’? [-Werror=implicit-function-declaration]
> >>   180 |  if (tlb_needs_table_invalidate()) {
> >>       |      ^~~~~~~~~~~~~~~~~~~~~~~~~~
> >>       |      tlb_table_invalidate
> >> cc1: some warnings being treated as errors
> >> make[1]: *** [scripts/Makefile.build:281: mm/mmu_gather.o] Error 1
> >> make: *** [Makefile:1756: mm] Error 2
> > 
> > *sigh*, thanks, I'll go dig out the local cross compiler set then.
> 
> FWIW, I recommend keeping a Debian box at hand where installing the cross-compiler
> is a matter of running "apt install gcc-sh4-linux-gnu" ;-).

I happen to have Debian on most of my machines ;-) And I used to
crosstool build my own toolchains for a while, but these days I mostly
just fetch them from kernel.org, since they're being kept up-to-date
fairly often.

$ /opt/cross/bin/sh4-linux-gcc --version
sh4-linux-gcc (GCC) 10.1.0