From: Andy Shevchenko <andy@kernel.org>
To: Kent Gibson <warthog618@gmail.com>
Cc: linux-kernel@vger.kernel.org, linux-gpio@vger.kernel.org,
brgl@bgdev.pl, linus.walleij@linaro.org
Subject: Re: [PATCH 2/4] gpiolib: cdev: allocate linereq using kvzalloc()
Date: Wed, 20 Dec 2023 16:30:24 +0200 [thread overview]
Message-ID: <ZYL6gIpG5GBONVSO@smile.fi.intel.com> (raw)
In-Reply-To: <20231220015106.16732-3-warthog618@gmail.com>
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
next prev parent reply other threads:[~2023-12-20 14:30 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-12-20 1:51 [PATCH 0/4] gpiolib: cdev: guard tidying Kent Gibson
2023-12-20 1:51 ` [PATCH 1/4] gpiolib: cdev: include overflow.h Kent Gibson
2023-12-20 1:51 ` [PATCH 2/4] gpiolib: cdev: allocate linereq using kvzalloc() Kent Gibson
2023-12-20 14:30 ` Andy Shevchenko [this message]
2023-12-20 14:53 ` Kent Gibson
2023-12-20 14:58 ` Andy Shevchenko
2023-12-20 1:51 ` [PATCH 3/4] gpiolib: cdev: replace locking wrappers for config_mutex with guards Kent Gibson
2023-12-20 1:51 ` [PATCH 4/4] gpiolib: cdev: replace locking wrappers for gpio_device " Kent Gibson
2023-12-20 11:55 ` Linus Walleij
2023-12-20 12:05 ` Bartosz Golaszewski
2023-12-20 12:13 ` Kent Gibson
2023-12-20 12:16 ` Bartosz Golaszewski
2023-12-20 12:23 ` Kent Gibson
2023-12-20 12:30 ` Bartosz Golaszewski
2023-12-20 12:53 ` Kent Gibson
2023-12-20 13:19 ` Bartosz Golaszewski
2023-12-20 13:28 ` Kent Gibson
2023-12-20 13:47 ` Bartosz Golaszewski
2023-12-20 13:53 ` Kent Gibson
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