linux-kernel - Re: linux-next: build failure after merge of the btrfs tree

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Date:   Fri, 8 Oct 2021 13:56:29 +0800
From:   Qu Wenruo <wqu@...e.com>
To:     Stephen Rothwell <sfr@...b.auug.org.au>,
        David Sterba <dsterba@...e.cz>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>
Subject: Re: linux-next: build failure after merge of the btrfs tree



On 2021/10/8 12:03, Stephen Rothwell wrote:
> Hi all,
> 
> After merging the btrfs tree, today's linux-next build (nds32 allyesconfig
> nds32le-gcc8) failed like this:
> 
> nds32le-linux-ld: fs/btrfs/lzo.o: in function `lzo_compress_pages':
> (.text+0x226): undefined reference to `__umoddi3'
> nds32le-linux-ld: (.text+0x22a): undefined reference to `__umoddi3'
> nds32le-linux-ld: (.text+0x660): undefined reference to `__umoddi3'
> nds32le-linux-ld: (.text+0x664): undefined reference to `__umoddi3'
> 
> Probably Caused by commit
> 
>    0078783c7089 ("btrfs: rework lzo_compress_pages() to make it subpage compatible")

Yes, that's the commit.

It's calling (u64) % (u32), causing the problem.

And we got an earlier report with a better solution by doing (u64) & 
(u32 mask - 1).

I guess the latest version is not yet pushed to -next.

Thanks,
Qu
> 
> This caused build failures in several other 32 bit architecture builds.
>