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

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Message-ID: <87lenq16zq.fsf@mpe.ellerman.id.au>
Date:   Fri, 02 Dec 2022 20:37:29 +1100
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Stephen Rothwell <sfr@...b.auug.org.au>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     Benjamin Gray <bgray@...ux.ibm.com>,
        "Christopher M. Riedl" <cmr@...escreens.de>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>,
        PowerPC <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: linux-next: build failure after merge of the tip tree

Stephen Rothwell <sfr@...b.auug.org.au> writes:
> Hi all,
>
> After merging the tip tree, today's linux-next build (powerpc
> ppc64_defconfig) failed like this:
>
> arch/powerpc/lib/code-patching.c: In function 'text_area_cpu_up_mm':
> arch/powerpc/lib/code-patching.c:157:14: error: implicit declaration of function 'copy_init_mm' [-Werror=implicit-function-declaration]
>   157 |         mm = copy_init_mm();
>       |              ^~~~~~~~~~~~
>
> Caused by commit
>
>   107b6828a7cd ("x86/mm: Use mm_alloc() in poking_init()")
>
> interacting with commit
>
>   55a02e6ea958 ("powerpc/code-patching: Use temporary mm for Radix MMU")
>
> from the powerpc tree.
>
> I partially reverted commit 107b6828a7cd - I left the change to
> arch/x86/mm/init.c applied.  Though, I wonder if the powerpc tree should
> use mm_alloc() instead of copy_init_mm() as well?  The tip tree commit
> says:
>
>     Instead of duplicating init_mm, allocate a fresh mm. The advantage is
>     that mm_alloc() has much simpler dependencies. Additionally it makes
>     more conceptual sense, init_mm has no (and must not have) user state
>     to duplicate.

I needed to rebase my next anyway, so I've squashed in a change to use
mm_alloc() in the powerpc commit. So this issue will be gone on Monday.

cheers