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85bcfaf69c
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Nicholas Piggin 85bcfaf69c powerpc/64s/radix: optimise pte_update 
Implementing pte_update with pte_xchg (which uses cmpxchg) is
inefficient. A single larx/stcx. works fine, no need for the less
efficient cmpxchg sequence.

Then remove the memory barriers from the operation. There is a
requirement for TLB flushing to load mm_cpumask after the store
that reduces pte permissions, which is moved into the TLB flush
code.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-06-03 20:40:36 +10:00
..
boot Merge branch 'topic/kbuild' into next 2018-06-03 20:24:15 +10:00
configs powerpc/config: powernv_defconfig updates 2018-05-10 23:25:07 +10:00
crypto crypto: hash - annotate algorithms taking optional key 2018-01-12 23:03:35 +11:00
include powerpc/64s/radix: optimise pte_update 2018-06-03 20:40:36 +10:00
kernel powerpc: use task_pid_nr() for TID allocation 2018-06-03 20:40:31 +10:00
kvm Merge branch 'topic/ppc-kvm' into next 2018-05-15 22:28:19 +10:00
lib powerpc/altivec: Add missing prototypes for altivec 2018-05-25 12:04:38 +10:00
math-emu License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
mm powerpc/64s/radix: optimise pte_update 2018-06-03 20:40:36 +10:00
net Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-03-05 11:29:24 -08:00
oprofile powerpc: Use sizeof(*foo) rather than sizeof(struct foo) 2018-03-20 16:47:53 +11:00
perf powerpc/pmu/fsl: fix is_nmi test for irq mask change 2018-06-03 20:40:29 +10:00
platforms ocxl: Rename pnv_ocxl_spa_remove_pe to clarify it's action 2018-06-03 20:40:32 +10:00
purgatory License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
sysdev powerpc/xive: prepare all hcalls to support long busy delays 2018-05-10 23:25:10 +10:00
tools powerpc/kbuild: Use flags variables rather than overriding LD/CC/AS 2018-06-01 23:08:09 +10:00
xmon powerpc/64: change softe to irqmask in show_regs and xmon 2018-06-03 20:40:30 +10:00
Kconfig powerpc/livepatch: Implement reliable stack tracing for the consistency model 2018-05-10 23:25:12 +10:00
Kconfig.debug powerpc: Add new kconfig CONFIG_PPC_IRQ_SOFT_MASK_DEBUG 2018-01-19 22:37:03 +11:00
Makefile powerpc/kbuild: Use flags variables rather than overriding LD/CC/AS 2018-06-01 23:08:09 +10:00
Makefile.postlink License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00