Thomas Gleixner 8101b5a153 ARM: futex: Address build warning ... Stephen reported the following build warning on a ARM multi_v7_defconfig build with GCC 9.2.1: kernel/futex.c: In function 'do_futex': kernel/futex.c:1676:17: warning: 'oldval' may be used uninitialized in this function [-Wmaybe-uninitialized] 1676 | return oldval == cmparg; | ~~~~~~~^~~~~~~~~ kernel/futex.c:1652:6: note: 'oldval' was declared here 1652 | int oldval, ret; | ^~~~~~ introduced by commit a08971e948 ("futex: arch_futex_atomic_op_inuser() calling conventions change"). While that change should not make any difference it confuses GCC which fails to work out that oldval is not referenced when the return value is not zero. GCC fails to properly analyze arch_futex_atomic_op_inuser(). It's not the early return, the issue is with the assembly macros. GCC fails to detect that those either set 'ret' to 0 and set oldval or set 'ret' to -EFAULT which makes oldval uninteresting. The store to the callsite supplied oldval pointer is conditional on ret == 0. The straight forward way to solve this is to make the store unconditional. Aside of addressing the build warning this makes sense anyway because it removes the conditional from the fastpath. In the error case the stored value is uninteresting and the extra store does not matter at all. Reported-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Link: https://lkml.kernel.org/r/87pncao2ph.fsf@nanos.tec.linutronix.de		2020-05-07 00:41:47 +02:00
..
boot	ARM: SoC fixes	2020-04-23 09:36:40 -07:00
common
configs	ARM: defconfig updates	2020-04-03 15:15:10 -07:00
crypto	crypto: arch/nhpoly1305 - process in explicit 4k chunks	2020-04-30 15:16:59 +10:00
include	ARM: futex: Address build warning	2020-05-07 00:41:47 +02:00
kernel	SPDX patches for 5.7-rc1.	2020-04-03 13:12:26 -07:00
lib
mach-actions
mach-alpine
mach-artpec
mach-asm9260
mach-aspeed
mach-at91	ARM: SoC updates	2020-04-03 15:02:35 -07:00
mach-axxia
mach-bcm
mach-berlin
mach-clps711x
mach-cns3xxx	ARM: cns3xxx: replace setup_irq() by request_irq()	2020-03-27 14:11:47 +01:00
mach-davinci
mach-digicolor
mach-dove
mach-ebsa110
mach-efm32
mach-ep93xx	ARM: ep93xx: Replace setup_irq() by request_irq()	2020-03-27 14:11:42 +01:00
mach-exynos
mach-footbridge
mach-gemini
mach-highbank
mach-hisi
mach-imx	ARM: imx: provide v7_cpu_resume() only on ARM_CPU_SUSPEND=y	2020-04-17 16:29:59 +02:00
mach-integrator	ARM: integrator: impd1: Use GPIO_LOOKUP() helper macro	2020-03-26 22:05:12 +01:00
mach-iop32x	ARM: iop32x: replace setup_irq() by request_irq()	2020-03-27 14:10:52 +01:00
mach-ixp4xx
mach-keystone
mach-lpc18xx
mach-lpc32xx
mach-mediatek
mach-meson
mach-milbeaut
mach-mmp	ARM: mmp: replace setup_irq() by request_irq()	2020-03-27 14:11:50 +01:00
mach-moxart
mach-mv78xx0
mach-mvebu
mach-mxs
mach-nomadik
mach-npcm
mach-nspire
mach-omap1	ARM: SoC updates	2020-04-03 15:02:35 -07:00
mach-omap2	change email address for Pali Rohár	2020-04-10 15:36:22 -07:00
mach-orion5x
mach-oxnas
mach-picoxcell
mach-prima2
mach-pxa
mach-qcom	ARM: qcom: Add support for IPQ40xx	2020-03-31 21:03:27 +02:00
mach-rda
mach-realview
mach-rockchip
mach-rpc
mach-s3c24xx
mach-s3c64xx
mach-s5pv210
mach-sa1100
mach-shmobile
mach-socfpga
mach-spear	ARM: spear: replace setup_irq() by request_irq()	2020-03-27 14:11:45 +01:00
mach-sti
mach-stm32
mach-sunxi
mach-tango
mach-tegra
mach-u300
mach-uniphier
mach-ux500
mach-versatile
mach-vexpress
mach-vt8500
mach-zx
mach-zynq
mm	mm/special: create generic fallbacks for pte_special() and pte_mkspecial()	2020-04-10 15:36:21 -07:00
net	arm, bpf: Fix offset overflow for BPF_MEM BPF_DW	2020-04-14 21:27:54 +02:00
nwfpe
oprofile
plat-omap
plat-orion
plat-pxa
plat-samsung
plat-versatile
probes
tools
vdso
vfp
xen	arm/xen: make _xen_start_info static	2020-04-17 07:45:12 +02:00
Kconfig	ARM:	2020-04-02 15:13:15 -07:00
Kconfig-nommu
Kconfig.debug
Makefile	ARM: SoC updates	2020-04-03 15:02:35 -07:00