linux-kernel - Re: linux-next: build warning after merge of the bitmap tree

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Message-ID: <20250710220043.22d05555@canb.auug.org.au>
Date: Thu, 10 Jul 2025 22:00:43 +1000
From: Stephen Rothwell <sfr@...b.auug.org.au>
To: Ben Horgan <ben.horgan@....com>
Cc: Yury Norov <yury.norov@...il.com>, Linux Kernel Mailing List
 <linux-kernel@...r.kernel.org>, Linux Next Mailing List
 <linux-next@...r.kernel.org>
Subject: Re: linux-next: build warning after merge of the bitmap tree

Hi Ben,

On Thu, 10 Jul 2025 09:44:09 +0100 Ben Horgan <ben.horgan@....com> wrote:
>
> On 7/10/25 09:34, Stephen Rothwell wrote:
> > Hi all,
> > 
> > After merging the bitmap tree, today's linux-next build (arm64 defconfig)
> > produced this warning:
> > 
> > arch/arm64/kvm/sys_regs.c: In function 'access_mdcr':
> > arch/arm64/kvm/sys_regs.c:2654:17: warning: ignoring return value of 'u64_replace_bits' declared with attribute 'warn_unused_result' [-Wunused-result]
> >   2654 |                 u64_replace_bits(val, hpmn, MDCR_EL2_HPMN);
> >        |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > 
> > Introduced by commit
> > 
> >    f66f9c3d09c1 ("bitfield: Ensure the return values of helper functions are checked")
> >   
> 
> Sorry to have broken your tree. However, this is a valid warning and this misuse of u64_replace_bits() was the motivation for the commit.
> 
> The fix can be found here https://lore.kernel.org/kvmarm/20250709093808.920284-1-ben.horgan@arm.com/T/#mc9e47859302654d84b4f2b3d9032d2b595d5df49

Well, normally that fix would have been applied (with appropriate ACKs)
in the same tree and before f66f9c3d09c1 (or in a shared branch merged
into this tree and some other tree).

-- 
Cheers,
Stephen Rothwell

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