linux-kernel - Re: [PATCH 2/4] gpiolib: cdev: allocate linereq using kvzalloc()

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Message-ID: <ZYL6gIpG5GBONVSO@smile.fi.intel.com>
Date: Wed, 20 Dec 2023 16:30:24 +0200
From: Andy Shevchenko <andy@...nel.org>
To: Kent Gibson <warthog618@...il.com>
Cc: linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org, brgl@...ev.pl,
	linus.walleij@...aro.org
Subject: Re: [PATCH 2/4] gpiolib: cdev: allocate linereq using kvzalloc()

On Wed, Dec 20, 2023 at 09:51:04AM +0800, Kent Gibson wrote:
> The size of struct linereq may exceed a page, so allocate space for
> it using kvzalloc() instead of kzalloc().

It might be this needs a bit of elaboration. The kmalloc() tries to allocate
a contiguous (in physical address space) chunk of memory and with fragmented
memory it might be not possible. So the above issue might (rarely) happen.
In most cases the call to kmalloc() will succeed.

-- 
With Best Regards,
Andy Shevchenko