From: Peter Zijlstra <peterz@infradead.org>
To: Phong Tran <tranmanphong@gmail.com>
Cc: mark.rutland@arm.com, kstewart@linuxfoundation.org,
songliubraving@fb.com, andrew@lunn.ch, nsekhar@ti.com,
ast@kernel.org, jolsa@redhat.com, netdev@vger.kernel.org,
gerg@uclinux.org, lorenzo.pieralisi@arm.com, will@kernel.org,
linux-samsung-soc@vger.kernel.org, daniel@iogearbox.net,
festevam@gmail.com, gregory.clement@bootlin.com,
allison@lohutok.net, linux@armlinux.org.uk, krzk@kernel.org,
haojian.zhuang@gmail.com, bgolaszewski@baylibre.com,
tony@atomide.com, mingo@redhat.com, linux-imx@nxp.com,
yhs@fb.com, sebastian.hesselbarth@gmail.com,
illusionist.neo@gmail.com, jason@lakedaemon.net,
liviu.dudau@arm.com, s.hauer@pengutronix.de, acme@kernel.org,
lkundrak@v3.sk, robert.jarzmik@free.fr, dmg@turingmachine.org,
swinslow@gmail.com, namhyung@kernel.org, tglx@linutronix.de,
linux-omap
Subject: Re: [PATCH 01/15] arm: perf: cleanup cppcheck shifting error
Date: Mon, 24 Jun 2019 09:11:21 +0200 [thread overview]
Message-ID: <20190624071121.GN3436@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <20190623151313.970-2-tranmanphong@gmail.com>
On Sun, Jun 23, 2019 at 10:12:59PM +0700, Phong Tran wrote:
> fix "Shifting signed 32-bit value by 31 bits is undefined behaviour
> errors"
>
> [arch/arm/kernel/perf_event_v7.c:1080]: (error) Shifting signed 32-bit
> value by 31 bits is undefined behaviour
> [arch/arm/kernel/perf_event_v7.c:1436]: (error) Shifting signed 32-bit
> value by 31 bits is undefined behaviour
> [arch/arm/kernel/perf_event_v7.c:1783]: (error) Shifting signed 32-bit
> value by 31 bits is undefined behaviour
I don't think that is true; the kernel uses -fno-strict-overflow (which
implies -fwrapv) and that takes away all the signed UB.
next prev parent reply other threads:[~2019-06-24 7:11 UTC|newest]
Thread overview: 67+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-23 15:12 [PATCH 00/15] cleanup cppcheck signed shifting errors Phong Tran
2019-06-23 15:12 ` [PATCH 01/15] arm: perf: cleanup cppcheck shifting error Phong Tran
2019-06-24 7:11 ` Peter Zijlstra [this message]
2019-06-23 15:13 ` [PATCH 02/15] ARM: davinci: cleanup cppcheck shifting errors Phong Tran
2019-06-23 15:13 ` [PATCH 03/15] ARM: ep93xx: " Phong Tran
2019-06-23 15:23 ` Alexander Sverdlin
2019-06-23 15:13 ` [PATCH 04/15] ARM: exynos: cleanup cppcheck shifting error Phong Tran
2019-06-23 19:12 ` Krzysztof Kozlowski
2019-06-23 15:13 ` [PATCH 05/15] ARM: footbridge: " Phong Tran
2019-06-23 15:13 ` [PATCH 06/15] ARM: imx: cleanup cppcheck shifting errors Phong Tran
2019-06-24 3:16 ` Shawn Guo
2019-06-23 15:13 ` [PATCH 07/15] ARM: ks8695: cleanup cppcheck shifting error Phong Tran
2019-06-23 15:13 ` [PATCH 08/15] ARM: mmp: cleanup cppcheck shifting errors Phong Tran
2019-06-24 7:35 ` Lubomir Rintel
2019-06-23 15:13 ` [PATCH 09/15] ARM: omap2: cleanup cppcheck shifting error Phong Tran
2019-06-23 15:13 ` [PATCH 10/15] ARM: orion5x: cleanup cppcheck shifting errors Phong Tran
2019-06-23 15:23 ` Andrew Lunn
2019-06-24 7:31 ` Gregory CLEMENT
2019-06-23 15:13 ` [PATCH 11/15] ARM: pxa: " Phong Tran
2019-06-23 15:13 ` [PATCH 12/15] ARM: vexpress: cleanup cppcheck shifting error Phong Tran
2019-06-23 15:13 ` [PATCH 13/15] ARM: mm: cleanup cppcheck shifting errors Phong Tran
2019-06-23 15:13 ` [PATCH 14/15] ARM: bpf: cleanup cppcheck shifting error Phong Tran
2019-06-23 15:13 ` [PATCH 15/15] ARM: vfp: cleanup cppcheck shifting errors Phong Tran
2019-06-24 13:50 ` [PATCH V2 00/15] cleanup cppcheck signed " Phong Tran
2019-06-24 13:50 ` [PATCH V2 01/15] arm: perf: cleanup cppcheck shifting error Phong Tran
2019-06-24 13:50 ` [PATCH V2 02/15] ARM: davinci: cleanup cppcheck shifting errors Phong Tran
2019-06-24 13:50 ` [PATCH V2 03/15] ARM: ep93xx: " Phong Tran
2019-06-24 19:16 ` Alexander Sverdlin
2019-06-24 13:50 ` [PATCH V2 04/15] ARM: exynos: cleanup cppcheck shifting error Phong Tran
2019-06-24 13:58 ` Russell King - ARM Linux admin
2019-06-24 13:50 ` [PATCH V2 05/15] ARM: footbridge: " Phong Tran
2019-06-24 13:50 ` [PATCH V2 06/15] ARM: imx: cleanup cppcheck shifting errors Phong Tran
2019-06-24 13:50 ` [PATCH V2 07/15] ARM: ks8695: cleanup cppcheck shifting error Phong Tran
2019-06-24 13:50 ` [PATCH V2 08/15] ARM: mmp: cleanup cppcheck shifting errors Phong Tran
2019-06-24 13:59 ` Russell King - ARM Linux admin
2019-06-24 13:50 ` [PATCH V2 09/15] ARM: omap2: cleanup cppcheck shifting error Phong Tran
2019-06-24 13:51 ` [PATCH V2 10/15] ARM: orion5x: cleanup cppcheck shifting errors Phong Tran
2019-06-24 13:54 ` Andrew Lunn
2019-06-24 13:51 ` [PATCH V2 11/15] ARM: pxa: " Phong Tran
2019-06-24 13:51 ` [PATCH V2 12/15] ARM: vexpress: cleanup cppcheck shifting error Phong Tran
2019-06-24 13:57 ` Russell King - ARM Linux admin
2019-06-24 13:51 ` [PATCH V2 13/15] ARM: mm: cleanup cppcheck shifting errors Phong Tran
2019-06-24 13:51 ` [PATCH V2 14/15] ARM: bpf: cleanup cppcheck shifting error Phong Tran
2019-06-24 14:00 ` Russell King - ARM Linux admin
2019-06-24 13:51 ` [PATCH V2 15/15] ARM: vfp: cleanup cppcheck shifting errors Phong Tran
2019-06-24 14:02 ` [PATCH V2 00/15] cleanup cppcheck signed " Russell King - ARM Linux admin
2019-06-24 15:27 ` Peter Zijlstra
2019-06-24 15:28 ` Peter Zijlstra
2019-06-25 4:03 ` [PATCH V3 " Phong Tran
2019-06-25 4:03 ` [PATCH V3 01/15] arm: perf: cleanup cppcheck shifting error Phong Tran
2019-06-25 17:21 ` Will Deacon
2019-06-25 4:03 ` [PATCH V3 02/15] ARM: davinci: cleanup cppcheck shifting errors Phong Tran
2019-06-25 4:03 ` [PATCH V3 03/15] ARM: ep93xx: " Phong Tran
2019-06-25 4:03 ` [PATCH V3 04/15] ARM: exynos: cleanup cppcheck shifting error Phong Tran
2019-06-25 18:49 ` Krzysztof Kozlowski
2019-06-25 4:03 ` [PATCH V3 05/15] ARM: footbridge: " Phong Tran
2019-06-25 4:03 ` [PATCH V3 06/15] ARM: imx: cleanup cppcheck shifting errors Phong Tran
2019-06-25 4:03 ` [PATCH V3 07/15] ARM: ks8695: cleanup cppcheck shifting error Phong Tran
2019-06-25 4:03 ` [PATCH V3 08/15] ARM: mmp: cleanup cppcheck shifting errors Phong Tran
2019-06-25 4:03 ` [PATCH V3 09/15] ARM: omap2: cleanup cppcheck shifting error Phong Tran
2019-06-25 4:03 ` [PATCH V3 10/15] ARM: orion5x: cleanup cppcheck shifting errors Phong Tran
2019-06-25 4:03 ` [PATCH V3 11/15] ARM: pxa: " Phong Tran
2019-06-25 4:03 ` [PATCH V3 12/15] ARM: vexpress: cleanup cppcheck shifting error Phong Tran
2019-06-25 17:24 ` Sudeep Holla
2019-06-25 4:03 ` [PATCH V3 13/15] ARM: mm: cleanup cppcheck shifting errors Phong Tran
2019-06-25 4:03 ` [PATCH V3 14/15] ARM: bpf: cleanup cppcheck shifting error Phong Tran
2019-06-25 4:03 ` [PATCH V3 15/15] ARM: vfp: cleanup cppcheck shifting errors Phong Tran
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