From: Benoit Parrot <bparrot@ti.com>
To: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Cc: Linux Media Mailing List <linux-media@vger.kernel.org>,
Mauro Carvalho Chehab <mchehab@infradead.org>,
Hans Verkuil <hverkuil-cisco@xs4all.nl>,
Andy Walls <awalls@md.metrocast.net>,
Bluecherry Maintainers <maintainers@bluecherrydvr.com>,
Anton Sviridenko <anton@corp.bluecherry.net>,
Andrey Utkin <andrey.utkin@corp.bluecherry.net>,
Ismael Luceno <ismael@iodev.co.uk>,
"Lad, Prabhakar" <prabhakar.csengg@gmail.com>,
Kyungmin Park <kyungmin.park@samsung.com>,
Sylwester Nawrocki <s.nawrocki@samsung.com>,
Kukjin Kim <kgene@kernel.org>,
Krzysztof Kozlowski <krzk@kernel.org>,
Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
Thierry Reding <thierry.reding@gmail.com>,
Jonathan Hunter <jonathanh@nvidia.com>,
Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>,
Hyun Kwon <hyun.kwon@xilinx.com>,
Michal Simek <michal.simek@xilinx.com>,
Sakari Ailus <sakari.ailus@linux.intel.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Richard Fontana <rfontana@redhat.com>,
Kate Stewart <kstewart@linuxfoundation.org>,
Allison Randal <allison@lohutok.net>,
Thomas Gleixner <tglx@linutronix.de>,
<linux-arm-kernel@lists.infradead.org>,
<linux-samsung-soc@vger.kernel.org>,
<linux-tegra@vger.kernel.org>,
<linux-renesas-soc@vger.kernel.org>, <devel@driverdev.osuosl.org>
Subject: Re: [PATCH v2 5/7] media: use the BIT() macro
Date: Fri, 23 Aug 2019 07:12:05 -0500 [thread overview]
Message-ID: <20190823121204.ze4m6m3dxevjpjp6@ti.com> (raw)
In-Reply-To: <d6c04bf604084af63fec603b4afbd72c648e0394.1566553525.git.mchehab+samsung@kernel.org>
Mauro Carvalho Chehab <mchehab+samsung@kernel.org> wrote on Fri [2019-Aug-23 06:47:30 -0300]:
> As warned by cppcheck:
>
> [drivers/media/dvb-frontends/cx24123.c:434]: (error) Shifting signed 32-bit value by 31 bits is undefined behaviour
> [drivers/media/pci/bt8xx/bttv-input.c:87]: (error) Shifting signed 32-bit value by 31 bits is undefined behaviour
> [drivers/media/pci/bt8xx/bttv-input.c:98]: (error) Shifting signed 32-bit value by 31 bits is undefined behaviour
> ...
> [drivers/media/v4l2-core/v4l2-ioctl.c:1391]: (error) Shifting signed 32-bit value by 31 bits is undefined behaviour
>
> There are lots of places where we're doing 1 << 31. That's bad,
> as, depending on the architecture, this has an undefined behavior.
>
> The BIT() macro is already prepared to handle this, so, let's
> just switch all "1 << number" macros by BIT(number) at the header files
> with has 1 << 31.
>
> Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
> ---
>
> v2:
> As suggested by Laurent:
> - Don't touch multi-bit masks
> - remove explicit casts
>
For:
drivers/media/platform/am437x/am437x-vpfe_regs.h
drivers/media/platform/ti-vpe/vpe_regs.h
Reviewed-by: Benoit Parrot <bparrot@ti.com>
next prev parent reply other threads:[~2019-08-23 12:11 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-22 19:39 [PATCH 1/7] media: remove include stdarg.h from some drivers Mauro Carvalho Chehab
2019-08-22 19:39 ` [PATCH 2/7] media: vicodec: make life easier for static analyzers Mauro Carvalho Chehab
2019-08-22 19:39 ` [PATCH 3/7] media: aspeed-video: address a protential usage of an unit var Mauro Carvalho Chehab
2019-08-26 15:12 ` Eddie James
2019-08-22 19:39 ` [PATCH 4/7] media: ov9650: add a sanity check Mauro Carvalho Chehab
2019-08-23 10:33 ` Sylwester Nawrocki
2019-08-22 19:39 ` [PATCH 5/7] media: use the BIT() macro Mauro Carvalho Chehab
2019-08-23 0:08 ` Laurent Pinchart
2019-08-23 9:47 ` [PATCH v2 " Mauro Carvalho Chehab
2019-08-23 10:22 ` Sylwester Nawrocki
2019-08-23 12:12 ` Benoit Parrot [this message]
2019-08-23 20:45 ` Laurent Pinchart
2019-08-22 19:39 ` [PATCH 6/7] media: don't do an unsigned int with a 31 bit shift Mauro Carvalho Chehab
2019-08-23 9:08 ` Marc Gonzalez
2019-08-23 10:20 ` Mauro Carvalho Chehab
2019-08-23 11:09 ` Marc Gonzalez
2019-08-29 17:03 ` Kees Cook
2019-08-22 19:39 ` [PATCH 7/7] media: ngene: don't try to memcpy from NULL Mauro Carvalho Chehab
2019-08-22 19:43 ` Mauro Carvalho Chehab
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