From: Andrzej Hajda <a.hajda@samsung.com>
To: Joe Perches <joe@perches.com>,
Andrew Morton <akpm@linux-foundation.org>,
Patrick Venture <venture@google.com>,
Nancy Yuen <yuenn@google.com>,
Benjamin Fair <benjaminfair@google.com>,
Andrew Jeffery <andrew@aj.id.au>,
openbmc@lists.ozlabs.org, linux-kernel@vger.kernel.org,
linux-aspeed@lists.ozlabs.org,
linux-arm-kernel@lists.infradead.org,
linux-amlogic@lists.infradead.org, netdev@vger.kernel.org,
linux-mediatek@lists.infradead.org,
linux-stm32@st-md-mailman.stormreply.com,
linux-wireless@vger.kernel.org, linux-media@vger.kernel.org
Cc: linux-iio@vger.kernel.org, devel@driverdev.osuosl.org,
alsa-devel@alsa-project.org, linux-mmc@vger.kernel.org,
dri-devel@lists.freedesktop.org
Subject: Re: [PATCH 00/12] treewide: Fix GENMASK misuses
Date: Fri, 12 Jul 2019 14:54:09 +0200 [thread overview]
Message-ID: <469b0d3d-9466-b287-5ca3-27f3d01ff3cd@samsung.com> (raw)
In-Reply-To: <cover.1562734889.git.joe@perches.com>
Hi Joe,
On 10.07.2019 07:04, Joe Perches wrote:
> These GENMASK uses are inverted argument order and the
> actual masks produced are incorrect. Fix them.
>
> Add checkpatch tests to help avoid more misuses too.
>
> Joe Perches (12):
> checkpatch: Add GENMASK tests
> clocksource/drivers/npcm: Fix misuse of GENMASK macro
> drm: aspeed_gfx: Fix misuse of GENMASK macro
> iio: adc: max9611: Fix misuse of GENMASK macro
> irqchip/gic-v3-its: Fix misuse of GENMASK macro
> mmc: meson-mx-sdio: Fix misuse of GENMASK macro
> net: ethernet: mediatek: Fix misuses of GENMASK macro
> net: stmmac: Fix misuses of GENMASK macro
> rtw88: Fix misuse of GENMASK macro
> phy: amlogic: G12A: Fix misuse of GENMASK macro
> staging: media: cedrus: Fix misuse of GENMASK macro
> ASoC: wcd9335: Fix misuse of GENMASK macro
>
> drivers/clocksource/timer-npcm7xx.c | 2 +-
> drivers/gpu/drm/aspeed/aspeed_gfx.h | 2 +-
> drivers/iio/adc/max9611.c | 2 +-
> drivers/irqchip/irq-gic-v3-its.c | 2 +-
> drivers/mmc/host/meson-mx-sdio.c | 2 +-
> drivers/net/ethernet/mediatek/mtk_eth_soc.h | 2 +-
> drivers/net/ethernet/mediatek/mtk_sgmii.c | 2 +-
> drivers/net/ethernet/stmicro/stmmac/descs.h | 2 +-
> drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c | 4 ++--
> drivers/net/wireless/realtek/rtw88/rtw8822b.c | 2 +-
> drivers/phy/amlogic/phy-meson-g12a-usb2.c | 2 +-
> drivers/staging/media/sunxi/cedrus/cedrus_regs.h | 2 +-
> scripts/checkpatch.pl | 15 +++++++++++++++
> sound/soc/codecs/wcd-clsh-v2.c | 2 +-
> 14 files changed, 29 insertions(+), 14 deletions(-)
>
After adding following compile time check:
------
diff --git a/Makefile b/Makefile
index 5102b2bbd224..ac4ea5f443a9 100644
--- a/Makefile
+++ b/Makefile
@@ -457,7 +457,7 @@ KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE
KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
-fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
-Werror=implicit-function-declaration
-Werror=implicit-int \
- -Wno-format-security \
+ -Wno-format-security -Werror=div-by-zero \
-std=gnu89
KBUILD_CPPFLAGS := -D__KERNEL__
KBUILD_AFLAGS_KERNEL :=
diff --git a/include/linux/bits.h b/include/linux/bits.h
index 669d69441a62..61d74b103055 100644
--- a/include/linux/bits.h
+++ b/include/linux/bits.h
@@ -19,11 +19,11 @@
* GENMASK_ULL(39, 21) gives us the 64bit vector 0x000000ffffe00000.
*/
#define GENMASK(h, l) \
- (((~UL(0)) - (UL(1) << (l)) + 1) & \
+ (((~UL(0)) - (UL(1) << (l)) + 1 + 0/((h) >= (l))) & \
(~UL(0) >> (BITS_PER_LONG - 1 - (h))))
#define GENMASK_ULL(h, l) \
- (((~ULL(0)) - (ULL(1) << (l)) + 1) & \
+ (((~ULL(0)) - (ULL(1) << (l)) + 1 + 0/((h) >= (l))) & \
(~ULL(0) >> (BITS_PER_LONG_LONG - 1 - (h))))
#endif /* __LINUX_BITS_H */
-------
I was able to detect one more GENMASK misue (AARCH64, allyesconfig):
CC drivers/phy/rockchip/phy-rockchip-inno-hdmi.o
In file included from ../include/linux/bitops.h:5:0,
from ../include/linux/kernel.h:12,
from ../include/linux/clk.h:13,
from ../drivers/phy/rockchip/phy-rockchip-inno-hdmi.c:9:
../drivers/phy/rockchip/phy-rockchip-inno-hdmi.c: In function
‘inno_hdmi_phy_rk3328_power_on’:
../include/linux/bits.h:22:37: error: division by zero [-Werror=div-by-zero]
(((~UL(0)) - (UL(1) << (l)) + 1 + 0/((h) >= (l))) & \
^
../drivers/phy/rockchip/phy-rockchip-inno-hdmi.c:24:42: note: in
expansion of macro ‘GENMASK’
#define UPDATE(x, h, l) (((x) << (l)) & GENMASK((h), (l)))
^~~~~~~
../drivers/phy/rockchip/phy-rockchip-inno-hdmi.c:201:50: note: in
expansion of macro ‘UPDATE’
#define RK3328_TERM_RESISTOR_CALIB_SPEED_7_0(x) UPDATE(x, 7, 9)
^~~~~~
../drivers/phy/rockchip/phy-rockchip-inno-hdmi.c:1046:26: note: in
expansion of macro ‘RK3328_TERM_RESISTOR_CALIB_SPEED_7_0’
inno_write(inno, 0xc6, RK3328_TERM_RESISTOR_CALIB_SPEED_7_0(v));
Of course I do not advise to add the check as is to Kernel - it is
undefined behavior area AFAIK.
Regards
Andrzej
prev parent reply other threads:[~2019-07-12 12:54 UTC|newest]
Thread overview: 109+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20190710050444epcas1p250f7aa0f8798a7757df51d66f5970c2a@epcas1p2.samsung.com>
2019-07-10 5:04 ` [PATCH 00/12] treewide: Fix GENMASK misuses Joe Perches
2019-07-10 5:04 ` [PATCH 01/12] checkpatch: Add GENMASK tests Joe Perches
2019-07-24 18:03 ` Joe Perches
2019-07-10 5:04 ` [PATCH 02/12] clocksource/drivers/npcm: Fix misuse of GENMASK macro Joe Perches
2019-07-10 9:10 ` [tip:timers/urgent] " tip-bot for Joe Perches
2019-07-15 10:00 ` [PATCH 02/12] " Avi Fishman
2019-07-10 5:04 ` [PATCH 03/12] drm: aspeed_gfx: " Joe Perches
2019-07-24 17:16 ` Joe Perches
2019-07-25 1:10 ` Andrew Jeffery
2019-07-25 1:18 ` Joe Perches
2019-07-25 2:52 ` Joel Stanley
2019-07-25 14:37 ` Joe Perches
2019-07-10 5:04 ` [PATCH 04/12] iio: adc: max9611: " Joe Perches
2019-07-14 11:54 ` Jonathan Cameron
2019-07-14 12:19 ` Joe Perches
2019-07-14 14:37 ` Jacopo Mondi
2019-07-29 21:52 ` Jacopo Mondi
2019-07-31 8:37 ` Jonathan Cameron
2019-07-10 5:04 ` [PATCH 05/12] irqchip/gic-v3-its: " Joe Perches
2019-07-10 8:28 ` Marc Zyngier
2019-07-10 9:07 ` [tip:irq/urgent] " tip-bot for Joe Perches
2019-07-10 5:04 ` [PATCH 06/12] mmc: meson-mx-sdio: " Joe Perches
2019-07-22 7:23 ` Neil Armstrong
2019-07-22 13:43 ` Ulf Hansson
2019-07-10 5:04 ` [PATCH 07/12] net: ethernet: mediatek: Fix misuses " Joe Perches
2019-07-10 5:04 ` [PATCH 08/12] net: stmmac: " Joe Perches
2019-07-10 10:33 ` Jose Abreu
2019-07-10 5:04 ` [PATCH 09/12] rtw88: Fix misuse " Joe Perches
2019-07-10 5:07 ` Tony Chuang
2019-07-24 11:48 ` Kalle Valo
2019-07-10 5:04 ` [PATCH 10/12] phy: amlogic: G12A: " Joe Perches
2019-07-22 7:23 ` Neil Armstrong
2019-08-23 2:41 ` Kishon Vijay Abraham I
2019-08-23 4:59 ` Joe Perches
2019-07-10 5:04 ` [PATCH 11/12] staging: media: cedrus: " Joe Perches
2019-07-10 7:23 ` Paul Kocialkowski
2019-07-24 17:09 ` Joe Perches
2019-07-24 18:35 ` Greg Kroah-Hartman
2019-07-24 18:39 ` Joe Perches
2019-07-24 18:55 ` Greg Kroah-Hartman
2019-07-25 6:46 ` Hans Verkuil
2019-07-10 5:04 ` [PATCH 12/12] ASoC: wcd9335: " Joe Perches
2019-07-22 12:22 ` Applied "ASoC: wcd9335: Fix misuse of GENMASK macro" to the asoc tree Mark Brown
2019-07-10 9:17 ` [PATCH 00/12] treewide: Fix GENMASK misuses Johannes Berg
2019-07-10 9:43 ` Russell King - ARM Linux admin
2019-07-10 15:45 ` Joe Perches
2019-07-10 16:01 ` Joe Perches
2019-07-27 19:54 ` Rikard Falkeborn
2019-07-28 23:45 ` Joe Perches
2019-07-31 19:03 ` [PATCH] linux/bits.h: Add compile time sanity check of GENMASK inputs Rikard Falkeborn
2019-07-31 19:27 ` Joe Perches
2019-08-01 23:03 ` Rikard Falkeborn
2019-08-02 1:40 ` Masahiro Yamada
2019-08-02 3:13 ` Joe Perches
2019-08-02 3:25 ` Masahiro Yamada
2019-08-02 18:18 ` Rikard Falkeborn
2019-08-03 3:03 ` Masahiro Yamada
2019-08-03 3:12 ` Masahiro Yamada
2019-08-03 18:36 ` Rikard Falkeborn
2019-08-04 6:45 ` Masahiro Yamada
2019-08-05 19:55 ` Rikard Falkeborn
2019-08-06 15:19 ` Masahiro Yamada
2019-08-06 19:27 ` Rikard Falkeborn
2019-08-06 21:15 ` Joe Perches
2019-08-07 20:53 ` Rikard Falkeborn
2019-08-01 2:50 ` Masahiro Yamada
2019-08-01 2:57 ` Joe Perches
2019-08-01 23:03 ` Rikard Falkeborn
2019-08-01 23:03 ` [PATCH v2 1/2] linux/bits.h: Clarify macro argument names Rikard Falkeborn
2019-08-01 23:03 ` [PATCH v2 2/2] linux/bits.h: Add compile time sanity check of GENMASK inputs Rikard Falkeborn
2019-08-01 23:14 ` Joe Perches
2019-08-07 14:27 ` Guenter Roeck
2019-08-07 14:55 ` Masahiro Yamada
2019-08-07 16:52 ` Guenter Roeck
2019-08-07 20:07 ` Rikard Falkeborn
2019-08-08 0:07 ` Joe Perches
2019-08-08 0:58 ` Guenter Roeck
2019-08-08 1:08 ` Joe Perches
2019-08-08 1:53 ` Guenter Roeck
2019-08-08 2:44 ` kbuild test robot
2019-08-08 2:44 ` kbuild test robot
2019-08-08 3:46 ` [PATCH v2 1/2] linux/bits.h: Clarify macro argument names Masahiro Yamada
2019-08-10 18:43 ` Rikard Falkeborn
2019-08-10 19:20 ` Joe Perches
2019-08-11 18:49 ` [PATCH v3 0/3] Add compile time sanity check of GENMASK inputs Rikard Falkeborn
2019-08-11 18:49 ` [PATCH v3 1/3] x86/boot: Use common BUILD_BUG_ON Rikard Falkeborn
2019-08-12 18:19 ` [tip:x86/boot] " tip-bot for Rikard Falkeborn
2019-08-16 12:19 ` tip-bot for Rikard Falkeborn
2019-08-11 18:49 ` [PATCH v3 2/3] linux/build_bug.h: Change type to int Rikard Falkeborn
2019-10-06 2:26 ` Masahiro Yamada
2019-08-11 18:49 ` [PATCH v3 3/3] linux/bits.h: Add compile time sanity check of GENMASK inputs Rikard Falkeborn
2019-10-06 2:30 ` Masahiro Yamada
2019-10-08 7:23 ` Geert Uytterhoeven
2019-10-08 7:44 ` Masahiro Yamada
2019-10-08 7:52 ` Masahiro Yamada
2019-10-08 19:06 ` Rikard Falkeborn
2019-08-12 17:58 ` [PATCH v3 0/3] " Kees Cook
2019-10-05 19:46 ` Rikard Falkeborn
2019-10-09 21:45 ` [Patch v4 0/2] " Rikard Falkeborn
2019-10-09 21:45 ` [Patch v4 1/2] linux/build_bug.h: Change type to int Rikard Falkeborn
2019-10-09 21:45 ` [Patch v4 2/2] linux/bits.h: Add compile time sanity check of GENMASK inputs Rikard Falkeborn
2019-10-10 2:24 ` Masahiro Yamada
2019-10-12 2:27 ` Andrew Morton
2019-10-22 19:53 ` Rikard Falkeborn
2019-11-01 21:28 ` Rikard Falkeborn
2020-03-08 19:39 ` [PATCH v5] " Rikard Falkeborn
2020-03-09 16:40 ` Kees Cook
2019-07-11 21:30 ` [PATCH 00/12] treewide: Fix GENMASK misuses David Miller
2019-07-12 12:54 ` Andrzej Hajda [this message]
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