From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E2FDB610D for ; Mon, 12 May 2025 07:25:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1747034725; cv=none; b=FmNZC/Nqeudx6K63u6A51rGOSe4aDoem0BcwRj1N+PAT82wYBuABreLmQekGXfzdvWDVKEXAyjTUPLlpB98LrUJXC0PBUYyZfyRIszvAMwCZSXOPd4CQh60stIcSVQl7+bWxqrDjAhyX9dFVVK7p4yC+c29cbJSC64vmHXKSXVM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1747034725; c=relaxed/simple; bh=crPLgghiOnNAL85BUbI/KFRTiOOI9zFhY8oyGArgjIY=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=nnLszBrNS1URhp2ZMBtQNQR3QH8/ClaIzG1Ty3/zhRWwzzqp8NQZpFiE2gL8trXk2beUDIwcUhWxEUBFo40Hh4v5Bi3zbL867qMlbP2j+QNu3fyaokZPXnMucUbYqN9X+HZBpQ88qNUxMLKY4DVu8+Q0ZfWYYUki3tUeRgaZtmQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=gefRfbrc; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="gefRfbrc" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 485DAC4CEE7; Mon, 12 May 2025 07:25:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1747034724; bh=crPLgghiOnNAL85BUbI/KFRTiOOI9zFhY8oyGArgjIY=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=gefRfbrcCkPL8q3XQo1al8dMQlsdLGjAYBbQQ3O5+FRVH77bH1/eB8UXK9cxyh9QA Qq9hGSvKRDX8h0vAPky+V0/ZHCmsiSijYqmUhfOUbmMklTtijrGXxLDGGOL2rDLCFN 2pgbLoQj24pwQuEjLEEJu45DU7qJw/2KrVXDbTcyej/2oCvivvDe5Qv2EGM/qjoF8f fcZsBZ/aU7PUhVMRy5PuChaoYv6DXqRSBWEPyHPjr4u1QNPvz2KyeAmXKriuc1+m5/ cfHmI0S1bj7vI/ln6nUMuvUfHstF5vxz8P8iYiuv6QjuzhPWQQRilCdUHqJ5WXnExY o63BmDSjEmjnA== Message-ID: <0a61672b-1782-43ea-bf10-b6088a1fd2fd@kernel.org> Date: Mon, 12 May 2025 09:25:21 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [patch V2 26/45] genirq/chip: Rework irq_set_handler() variants To: Nathan Chancellor , Miguel Ojeda Cc: linux-kernel@vger.kernel.org, peterz@infradead.org, tglx@linutronix.de References: <20250509132211.GA3618294@ax162> <20250511172911.1008109-1-ojeda@kernel.org> <20250511174923.GA3193067@ax162> Content-Language: en-US From: Jiri Slaby Autocrypt: addr=jirislaby@kernel.org; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 11. 05. 25, 19:49, Nathan Chancellor wrote: > On Sun, May 11, 2025 at 07:29:11PM +0200, Miguel Ojeda wrote: >> On Fri, 09 May 2025 14:22:11 +0100 Nathan Chancellor wrote: >>> >>> I am investigating some cases where >>> >>> WARN(!irqs_disabled(), "Interrupts were enabled early\n"); >>> >>> in start_kernel() in init/main.c is triggered in certain builds with >>> clang after patch 23 of this series (very bizarre since the conversion >>> seems to be correct) and I happened to notice that this conversion seems >>> to be incorrect? Should this be scoped_irqdesc_get_and_buslock() like >>> below? >> >> Yeah, I am also seeing this in next-20250509 in a LLVM=1 arm64 defconfig + Rust >> build under QEMU. > > I noticed that the warning was reproducible with just the first patch of > the series that adds the lock guards and patch 23 but also several other > individual patches within the series, as I could not just revert patch > 23 on next-20250509 to fix it. I have no idea why yet because I have not > had the chance to actually sit down and dig into it but this diff fixes > every instance of the warning that I saw in my tests... :/ could be a > compiler bug or just some difference in behavior between compilers. > > diff --git a/kernel/irq/internals.h b/kernel/irq/internals.h > index bd2db6ebb98e..94f463de8f26 100644 > --- a/kernel/irq/internals.h > +++ b/kernel/irq/internals.h > @@ -176,10 +176,9 @@ __DEFINE_UNLOCK_GUARD(irqdesc_lock, struct irq_desc, > static inline class_irqdesc_lock_t class_irqdesc_lock_constructor(unsigned int irq, bool bus, > unsigned int check) > { > - class_irqdesc_lock_t _t = { > - .bus = bus, > - .lock = __irq_get_desc_lock(irq, &_t.flags, bus, check), I assume the value stored by __irq_get_desc_lock() to &_t.flags is overwritten by 0 by the initializer. class_irqdesc_lock_t::flags is later than ::lock in the structure, so __irq_get_desc_lock() should be called, setting ::flags, then the initializer should set flags to 0. > - }; > + class_irqdesc_lock_t _t = {}; > + _t.bus = bus; > + _t.lock = __irq_get_desc_lock(irq, &_t.flags, bus, check); That's why this works ^^. > return _t; > } > -- js suse labs