linux-kernel - Re: [PATCHv9 2/5] irqchip/tegra: Fix overflow implicit truncation warnings

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Date:   Tue, 25 Jan 2022 19:05:27 +0530
From:   Sai Prakash Ranjan <quic_saipraka@...cinc.com>
To:     Marc Zyngier <maz@...nel.org>
CC:     Will Deacon <will@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Arnd Bergmann <arnd@...db.de>,
        Steven Rostedt <rostedt@...dmis.org>,
        gregkh <gregkh@...uxfoundation.org>, <quic_psodagud@...cinc.com>,
        Trilok Soni <quic_tsoni@...cinc.com>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-arm-msm@...r.kernel.org>
Subject: Re: [PATCHv9 2/5] irqchip/tegra: Fix overflow implicit truncation
 warnings

On 1/25/2022 3:00 PM, Marc Zyngier wrote:
> On Mon, 24 Jan 2022 06:33:31 +0000,
> Sai Prakash Ranjan <quic_saipraka@...cinc.com> wrote:
>> Fix -Woverflow warnings for tegra irqchip driver which is a result
>> of moving arm64 custom MMIO accessor macros to asm-generic function
>> implementations giving a bonus type-checking now and uncovering these
>> overflow warnings.
>>
>> drivers/irqchip/irq-tegra.c: In function ‘tegra_ictlr_suspend’:
>> drivers/irqchip/irq-tegra.c:151:18: warning: large integer implicitly truncated to unsigned type [-Woverflow]
>>     writel_relaxed(~0ul, ictlr + ICTLR_COP_IER_CLR);
>>                    ^
>>
>> Cc: Marc Zyngier <maz@...nel.org>
>> Reviewed-by: Arnd Bergmann <arnd@...db.de>
>> Signed-off-by: Sai Prakash Ranjan <quic_saipraka@...cinc.com>
>> ---
>>   drivers/irqchip/irq-tegra.c | 10 +++++-----
>>   1 file changed, 5 insertions(+), 5 deletions(-)
>>
>> diff --git a/drivers/irqchip/irq-tegra.c b/drivers/irqchip/irq-tegra.c
>> index e1f771c72fc4..9e4e5b39c701 100644
>> --- a/drivers/irqchip/irq-tegra.c
>> +++ b/drivers/irqchip/irq-tegra.c
>> @@ -148,10 +148,10 @@ static int tegra_ictlr_suspend(void)
>>   		lic->cop_iep[i] = readl_relaxed(ictlr + ICTLR_COP_IEP_CLASS);
>>   
>>   		/* Disable COP interrupts */
>> -		writel_relaxed(~0ul, ictlr + ICTLR_COP_IER_CLR);
>> +		writel_relaxed(~0u, ictlr + ICTLR_COP_IER_CLR);
> Aside from the 'l' in writel really meaning 'long' (a historical
> artefact), it would probably be better to lift the ambiguity entirely
> and write this as GENMASK(31, 0), making it clear what is being set,
> no matter what the revision of the architecture is (this driver also
> works on 32bit machines).
>

Sure, I will make this change.

Thanks,
Sai