linux-kernel - Re: [PATCH] gpiolib: acpi: use BIT_ULL() for u64 mask in address space handler

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Message-ID: <CAMRc=MdRQzgSNorb9rHtAGWYPOK7t2o6q2gP9FLB3ECsvgVrAQ@mail.gmail.com>
Date: Tue, 27 Jan 2026 10:06:33 +0100
From: Bartosz Golaszewski <brgl@...nel.org>
To: Mika Westerberg <mika.westerberg@...ux.intel.com>
Cc: Denis Sergeev <denserg.edu@...il.com>, westeri@...nel.org, 
	andriy.shevchenko@...ux.intel.com, linusw@...nel.org, 
	linux-gpio@...r.kernel.org, linux-acpi@...r.kernel.org, 
	linux-kernel@...r.kernel.org, lvc-project@...uxtesting.org
Subject: Re: [PATCH] gpiolib: acpi: use BIT_ULL() for u64 mask in address
 space handler

On Tue, Jan 27, 2026 at 9:08 AM Mika Westerberg
<mika.westerberg@...ux.intel.com> wrote:
>
> On Mon, Jan 26, 2026 at 06:59:14AM +0300, Denis Sergeev wrote:
> > The BIT() macro uses unsigned long, which is 32 bits on 32-bit
> > architectures. When iterating over GPIO pins with index >= 32,
> > the expression (*value & BIT(i)) causes undefined behavior due
> > to shifting by a value >= type width.
> >
> > Since 'value' is a pointer to u64, use BIT_ULL() to ensure correct
> > 64-bit mask on all architectures.
> >
> > Found by Linux Verification Center (linuxtesting.org) with Svace.
> >
> > Fixes: 2c4d00cb8fc5 ("gpiolib: acpi: Use BIT() macro to increase readability")
> > Signed-off-by: Denis Sergeev <denserg.edu@...il.com>
>
> Reviewed-by: Mika Westerberg <westeri@...nel.org>

I'll queue this for v6.19-rc8.

Bart