linux-kernel - Re: [tip: locking/urgent] locking: Fix qspinlock/x86 inline asm error

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Message-ID: <64372250-a413-076e-3b6d-2d263ee9c7f2@suse.com>
Date:   Wed, 16 Nov 2022 10:40:10 +0100
From:   Juergen Gross <jgross@...e.com>
To:     linux-kernel@...r.kernel.org, linux-tip-commits@...r.kernel.org
Cc:     Guo Jin <guoj17@...natelecom.cn>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Nathan Chancellor <nathan@...nel.org>, x86@...nel.org
Subject: Re: [tip: locking/urgent] locking: Fix qspinlock/x86 inline asm error

On 16.11.22 10:21, tip-bot2 for Guo Jin wrote:
> The following commit has been merged into the locking/urgent branch of tip:
> 
> Commit-ID:     23df39fc6a36183af5e6e4f47523f1ad2cdc1d30
> Gitweb:        https://git.kernel.org/tip/23df39fc6a36183af5e6e4f47523f1ad2cdc1d30
> Author:        Guo Jin <guoj17@...natelecom.cn>
> AuthorDate:    Tue, 08 Nov 2022 14:01:26 +08:00
> Committer:     Peter Zijlstra <peterz@...radead.org>
> CommitterDate: Wed, 16 Nov 2022 10:18:09 +01:00
> 
> locking: Fix qspinlock/x86 inline asm error
> 
> When compiling linux 6.1.0-rc3 configured with CONFIG_64BIT=y and
> CONFIG_PARAVIRT_SPINLOCKS=y on x86_64 using LLVM 11.0, an error:
> "<inline asm> error: changed section flags for .spinlock.text,
> expected:: 0x6" occurred.
> 
> The reason is the .spinlock.text in kernel/locking/qspinlock.o
> is used many times, but its flags are omitted in subsequent use.
> 
> LLVM 11.0 assembler didn't permit to
> leave out flags in subsequent uses of the same sections.
> 
> So this patch adds the corresponding flags to avoid above error.
> 
> Fixes: 501f7f69bca1 ("locking: Add __lockfunc to slow path functions")
> Signed-off-by: Guo Jin <guoj17@...natelecom.cn>
> Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> Reviewed-by: Nathan Chancellor <nathan@...nel.org>
> Link: https://lore.kernel.org/r/20221108060126.2505-1-guoj17@chinatelecom.cn

Wouldn't it be better to take my more generic patch [1] instead?

[1]: https://lore.kernel.org/lkml/20221109134418.6516-1-jgross@suse.com/


Juergen


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