Michael Ellerman 3ffa9d9e2a powerpc/64s: Fix Power9 DD2.0 workarounds by adding DD2.1 feature ... Recently we added a CPU feature for Power9 DD2.0, to capture the fact that some workarounds are required only on Power9 DD1 and DD2.0 but not DD2.1 or later. Then in commit 9d2f510a66 ("powerpc/64s/idle: avoid POWER9 DD1 and DD2.0 ERAT workaround on DD2.1") and commit e3646330cf "powerpc/64s/idle: avoid POWER9 DD1 and DD2.0 PMU workaround on DD2.1") we changed CPU_FTR_SECTIONs to check for DD1 or DD20, eg: BEGIN_FTR_SECTION PPC_INVALIDATE_ERAT END_FTR_SECTION_IFSET(CPU_FTR_POWER9_DD1 | CPU_FTR_POWER9_DD20) Unfortunately although this reads as "if set DD1 or DD2.0", the or is a bitwise or and actually generates a mask of both bits. The code that does the feature patching then checks that the value of the CPU features masked with that mask are equal to the mask. So the end result is we're checking for DD1 and DD20 being set, which never happens. Yes the API is terrible. Removing the ERAT workaround on DD2.0 results in random SEGVs, the system tends to boot, but things randomly die including sometimes dhclient, udev etc. To fix the problem and hopefully avoid it in future, we remove the DD2.0 CPU feature and instead add a DD2.1 (or later) feature. This allows us to easily express that the workarounds are required if DD2.1 is not set. At some point we will drop the DD1 workarounds entirely and some of this can be cleaned up. Fixes: 9d2f510a66 ("powerpc/64s/idle: avoid POWER9 DD1 and DD2.0 ERAT workaround on DD2.1") Fixes: e3646330cf ("powerpc/64s/idle: avoid POWER9 DD1 and DD2.0 PMU workaround on DD2.1") Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>		2017-11-15 14:25:42 +11:00
..
boot	powerpc: dts: acadia: DT fix s/#interrupts-parent/#interrupt-parent/	2017-10-22 12:08:31 +02:00
configs	powerpc/configs: Enable I2C_CHARDEV for pseries and powernv	2017-10-22 12:08:31 +02:00
crypto
include	powerpc/64s: Fix Power9 DD2.0 workarounds by adding DD2.1 feature	2017-11-15 14:25:42 +11:00
kernel	powerpc/64s: Fix Power9 DD2.0 workarounds by adding DD2.1 feature	2017-11-15 14:25:42 +11:00
kvm	KVM: PPC: Book3S HV: Handle host system reset in guest mode	2017-11-06 16:48:06 +11:00
lib	powerpc/lib: Implement UACCESS_FLUSHCACHE API	2017-11-13 08:00:31 +11:00
math-emu
mm	powerpc/64s: mm_context.addr_limit is only used on hash	2017-11-13 23:35:43 +11:00
net	bpf: take advantage of stack_depth tracking in powerpc JIT	2017-11-06 16:48:16 +11:00
oprofile	powerpc/oprofile: Use setup_timer() helper	2017-10-04 11:28:01 +11:00
perf	Merge branch 'fixes' into next	2017-11-10 20:55:03 +11:00
platforms	powerpc/powernv/npu: Don't explicitly flush nmmu tlb	2017-11-13 08:00:30 +11:00
purgatory	powerpc/asm: Convert .llong directives to .8byte	2017-08-31 14:26:47 +10:00
sysdev	Merge branch 'fixes' into next	2017-11-10 20:55:03 +11:00
tools
xmon	powerpc/xmon: Support dumping software pagetables	2017-11-08 22:04:10 +11:00
Kconfig	powerpc/lib: Implement UACCESS_FLUSHCACHE API	2017-11-13 08:00:31 +11:00
Kconfig.debug	powerpc: Disable the fast-endian switch syscall by default	2017-10-22 12:08:31 +02:00
Makefile
Makefile.postlink