Gautham R. Shenoy b03897cf31 powerpc/powernv: Fix save/restore of SPRG3 on entry/exit from stop (idle) ... On 64-bit servers, SPRN_SPRG3 and its userspace read-only mirror SPRN_USPRG3 are used as userspace VDSO write and read registers respectively. SPRN_SPRG3 is lost when we enter stop4 and above, and is currently not restored. As a result, any read from SPRN_USPRG3 returns zero on an exit from stop4 (Power9 only) and above. Thus in this situation, on POWER9, any call from sched_getcpu() always returns zero, as on powerpc, we call __kernel_getcpu() which relies upon SPRN_USPRG3 to report the CPU and NUMA node information. Fix this by restoring SPRN_SPRG3 on wake up from a deep stop state with the sprg_vdso value that is cached in PACA. Fixes: e1c1cfed54 ("powerpc/powernv: Save/Restore additional SPRs for stop4 cpuidle") Cc: stable@vger.kernel.org # v4.14+ Reported-by: Florian Weimer <fweimer@redhat.com> Signed-off-by: Gautham R. Shenoy <ego@linux.vnet.ibm.com> Reviewed-by: Michael Ellerman <mpe@ellerman.id.au> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>		2018-07-18 20:40:17 +10:00
..
boot
configs
crypto
include	KVM: PPC: Check if IOMMU page is contained in the pinned physical page	2018-07-18 16:17:17 +10:00
kernel	powerpc/powernv: Fix save/restore of SPRG3 on entry/exit from stop (idle)	2018-07-18 20:40:17 +10:00
kvm	KVM: PPC: Check if IOMMU page is contained in the pinned physical page	2018-07-18 16:17:17 +10:00
lib
math-emu
mm	KVM: PPC: Check if IOMMU page is contained in the pinned physical page	2018-07-18 16:17:17 +10:00
net
oprofile
perf
platforms	powerpc/powermac: Fix rtc read/write functions	2018-06-27 13:48:49 +10:00
purgatory
sysdev
tools
xmon	powerpc/xmon: Fix disassembly since printf changes	2018-07-17 21:18:14 +10:00
Kconfig
Kconfig.debug
Makefile	powerpc/Makefile: Assemble with -me500 when building for E500	2018-07-18 20:34:42 +10:00
Makefile.postlink