From: Kees Cook <kees@kernel.org>
To: Jani Nikula <jani.nikula@intel.com>
Cc: linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org,
intel-gfx@lists.freedesktop.org,
Andy Shevchenko <andy@kernel.org>
Subject: Re: [PATCH v2 1/2] string: add mem_is_zero() helper to check if memory area is all zeros
Date: Thu, 15 Aug 2024 09:07:01 -0700 [thread overview]
Message-ID: <202408150906.28A920F62@keescook> (raw)
In-Reply-To: <20240814100035.3100852-1-jani.nikula@intel.com>
On Wed, Aug 14, 2024 at 01:00:34PM +0300, Jani Nikula wrote:
> Almost two thirds of the memchr_inv() usages check if the memory area is
> all zeros, with no interest in where in the buffer the first non-zero
> byte is located. Checking for !memchr_inv(s, 0, n) is also not very
> intuitive or discoverable. Add an explicit mem_is_zero() helper for this
> use case.
>
> Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Kees Cook <kees@kernel.org>
--
Kees Cook
prev parent reply other threads:[~2024-08-15 16:07 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-08-14 10:00 [PATCH v2 1/2] string: add mem_is_zero() helper to check if memory area is all zeros Jani Nikula
2024-08-14 10:00 ` [PATCH v2 2/2] drm: use mem_is_zero() instead of !memchr_inv(s, 0, n) Jani Nikula
2024-08-15 16:07 ` Kees Cook
2024-08-16 13:12 ` Jani Nikula
2024-08-14 12:44 ` [PATCH v2 1/2] string: add mem_is_zero() helper to check if memory area is all zeros Andy Shevchenko
2024-08-15 16:07 ` Kees Cook [this message]
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