Nathan Chancellor ff8acf9290 arm64: futex: Restore oldval initialization to work around buggy compilers ... Commit 045afc2412 ("arm64: futex: Fix FUTEX_WAKE_OP atomic ops with non-zero result value") removed oldval's zero initialization in arch_futex_atomic_op_inuser because it is not necessary. Unfortunately, Android's arm64 GCC 4.9.4 [1] does not agree: ../kernel/futex.c: In function 'do_futex': ../kernel/futex.c:1658:17: warning: 'oldval' may be used uninitialized in this function [-Wmaybe-uninitialized] return oldval == cmparg; ^ In file included from ../kernel/futex.c:73:0: ../arch/arm64/include/asm/futex.h:53:6: note: 'oldval' was declared here int oldval, ret, tmp; ^ GCC fails to follow that when ret is non-zero, futex_atomic_op_inuser returns right away, avoiding the uninitialized use that it claims. Restoring the zero initialization works around this issue. [1]: https://android.googlesource.com/platform/prebuilts/gcc/linux-x86/aarch64/aarch64-linux-android-4.9/ Cc: stable@vger.kernel.org Fixes: 045afc2412 ("arm64: futex: Fix FUTEX_WAKE_OP atomic ops with non-zero result value") Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Nathan Chancellor <natechancellor@gmail.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>		2019-04-18 18:17:08 +01:00
..
boot	Fixes for dtc warnings, fixes for ethernet transfers on rk3328,	2019-04-07 15:15:31 -07:00
configs	Allwinner arm64 defconfig changes for 5.1	2019-02-15 16:51:26 +01:00
crypto	Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6	2019-03-05 09:09:55 -08:00
include	arm64: futex: Restore oldval initialization to work around buggy compilers	2019-04-18 18:17:08 +01:00
kernel	arm64: backtrace: Don't bother trying to unwind the userspace stack	2019-04-08 18:05:24 +01:00
kvm	KVM: arm64: Reset the PMU in preemptible context	2019-03-19 17:56:24 +00:00
lib	arm64: string: use asm EXPORT_SYMBOL()	2018-12-10 11:50:12 +00:00
mm	treewide: add checks for the return value of memblock_alloc*()	2019-03-12 10:04:02 -07:00
net	arm64: bpf: implement jitting of JMP32	2019-01-26 13:33:02 -08:00
xen	arm64: mm: Add additional parameter to uaccess_ttbr0_disable	2018-01-17 13:57:49 +01:00
Kconfig	arm64: remove obsolete selection of MULTI_IRQ_HANDLER	2019-03-20 17:34:16 +00:00
Kconfig.debug	Kconfig: consolidate the "Kernel hacking" menu	2018-08-02 08:06:48 +09:00
Kconfig.platforms	This pull request brings in a build fix for arm64 with bcm2835	2019-03-18 10:31:24 -07:00
Makefile	kasan, arm64: adjust shadow size for tag-based mode	2018-12-28 12:11:43 -08:00