linux-kernel - Re: linux-next: build warnings after merge of the block tree

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Date:   Mon, 27 Mar 2023 09:26:30 -0700
From:   Josh Poimboeuf <jpoimboe@...nel.org>
To:     Stephen Rothwell <sfr@...b.auug.org.au>
Cc:     Jens Axboe <axboe@...nel.dk>,
        Peter Zijlstra <peterz@...radead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>
Subject: Re: linux-next: build warnings after merge of the block tree

On Mon, Mar 27, 2023 at 12:00:17PM +1100, Stephen Rothwell wrote:
> Hi all,
> 
> After merging the block tree, today's linux-next build (x86_64
> allnoconfig) produced these warnings:
> 
> lib/iov_iter.o: warning: objtool: .altinstr_replacement+0x0: redundant UACCESS d
> isable
> lib/iov_iter.o: warning: objtool: iovec_from_user.part.0+0xc7: call to copy_comp
> at_iovec_from_user.part.0() with UACCESS enabled
> lib/iov_iter.o: warning: objtool: __import_iovec+0x21d: call to copy_compat_iovec_from_user.part.0() with UACCESS enabled
> 
> Presumably introduced by commit
> 
>   6376ce56feb6 ("iov_iter: import single vector iovecs as ITER_UBUF")

I'm not able to recreate.  What's your compiler version?

It's complaining about a call to a "part.0" function, maybe the IPA
optimization is moving the STAC to before the call.

-- 
Josh