linux-kernel - Re: Merge branch 'core-objtool-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

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Message-ID: <20200409073807.GA2483@worktop.programming.kicks-ass.net>
Date:   Thu, 9 Apr 2020 09:38:07 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     youling 257 <youling257@...il.com>
Cc:     viro@...iv.linux.org.uk, jpoimboe@...hat.com,
        linux-kernel@...r.kernel.org
Subject: Re: Merge branch 'core-objtool-for-linus' of
 git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

On Thu, Apr 09, 2020 at 10:00:53AM +0800, youling 257 wrote:
> d937a6dfc9428f470c3ce4d459c390944ddef538 caused 64bit kernel build
> failed on 32bit userspace.
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d937a6dfc9428f470c3ce4d459c390944ddef538
> 
> 2020-04-08 16:13 GMT+08:00, youling 257 <youling257@...il.com>:
> > after this merge branch, build 64bit kernel failed on 32bit userspace.
> >
> >
> >   CC       tools/objtool/builtin-check.o
> >   CC       tools/objtool/builtin-orc.o
> > In file included from check.h:10,
> >                  from builtin-check.c:18:
> > elf.h: In function ‘sec_offset_hash’:
> > elf.h:102:14: error: right shift count >= width of type
> > [-Werror=shift-count-overflow]
> >   102 |  oh = offset >> 32;
> >       |              ^~

Oh right; I figured it wouldn't matter since we don't do objtool for
32bit kernels, but I suppose you're cross building a 64bit kernel on a
32bit host or something daft like that?

I'll go fix it.