Will Deacon 1e6e57d9b3 arm64: percpu: rewrite ll/sc loops in assembly ... Writing the outer loop of an LL/SC sequence using do {...} while constructs potentially allows the compiler to hoist memory accesses between the STXR and the branch back to the LDXR. On CPUs that do not guarantee forward progress of LL/SC loops when faced with memory accesses to the same ERG (up to 2k) between the failed STXR and the branch back, we may end up livelocking. This patch avoids this issue in our percpu atomics by rewriting the outer loop as part of the LL/SC inline assembly block. Cc: <stable@vger.kernel.org> Fixes: f97fc81079 ("arm64: percpu: Implement this_cpu operations") Reviewed-by: Mark Rutland <mark.rutland@arm.com> Tested-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>		2016-10-19 15:37:29 +01:00
..
boot	Merge branch 'for-4.9' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata	2016-10-14 11:41:28 -07:00
configs	ZTE arm64 defconfig updates for 4.9:	2016-09-19 22:35:21 +02:00
crypto	crypto: arm64/aes-ctr - fix NULL dereference in tail processing	2016-09-13 18:44:59 +08:00
include	arm64: percpu: rewrite ll/sc loops in assembly	2016-10-19 15:37:29 +01:00
kernel	arm64: swp emulation: bound LL/SC retries before rescheduling	2016-10-19 15:37:23 +01:00
kvm	KVM updates for v4.9-rc1	2016-10-06 10:49:01 -07:00
lib	Merge branch 'work.uaccess' into for-linus	2016-10-14 20:42:44 -04:00
mm	IOMMU Updates for Linux v4.9	2016-10-11 12:52:41 -07:00
net
xen
Kconfig	arm64: kaslr: keep modules close to the kernel when DYNAMIC_FTRACE=y	2016-10-17 16:24:02 +01:00
Kconfig.debug	arm64: always enable DEBUG_RODATA and remove the Kconfig option	2016-08-26 10:13:41 +01:00
Kconfig.platforms	ARM: 64-bit DT updates for v4.8	2016-10-07 21:32:39 -07:00
Makefile	arm64: Set UTS_MACHINE in the Makefile	2016-08-31 12:31:38 +01:00