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| author | Johannes Berg <johannes.berg@intel.com> | 2019-12-13 12:01:28 +0300 |
|---|---|---|
| committer | Richard Weinberger <richard@nod.at> | 2020-01-20 00:42:06 +0300 |
| commit | d65197ad52494bed3b5e64708281b8295f76c391 (patch) | |
| tree | 6b62b3fc956ae45c2bcc417f3bebe92dcef5a2a3 /arch/um | |
| parent | 87c9366e17259040a9118e06b6dc8de986e5d3d1 (diff) | |
| download | linux-d65197ad52494bed3b5e64708281b8295f76c391.tar.xz | |
um: Fix time-travel=inf-cpu with xor/raid6
Today, I erroneously built a time-travel configuration with btrfs
enabled, and noticed it cannot boot in time-travel=inf-cpu mode,
both xor and raid6 speed measurement gets stuck.
For xor, work around it by picking the first algorithm if inf-cpu
mode is enabled.
For raid6, I didn't find such a workaround, so disallow enabling
time-travel mode if RAID6_PQ_BENCHMARK is enabled.
With this, and RAID6_PQ_BENCHMARK disabled, I can boot a kernel
that has btrfs enabled in time-travel=inf-cpu mode.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Acked-by: Anton Ivanov <anton.ivanov@cambridgegreys.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
Diffstat (limited to 'arch/um')
| -rw-r--r-- | arch/um/Kconfig | 2 | ||||
| -rw-r--r-- | arch/um/include/asm/Kbuild | 1 | ||||
| -rw-r--r-- | arch/um/include/asm/xor.h | 7 |
3 files changed, 9 insertions, 1 deletions
diff --git a/arch/um/Kconfig b/arch/um/Kconfig index 6f0edd0c0220..0917f8443c28 100644 --- a/arch/um/Kconfig +++ b/arch/um/Kconfig @@ -189,6 +189,8 @@ config SECCOMP config UML_TIME_TRAVEL_SUPPORT bool prompt "Support time-travel mode (e.g. for test execution)" + # inf-cpu mode is incompatible with the benchmarking + depends on !RAID6_PQ_BENCHMARK help Enable this option to support time travel inside the UML instance. diff --git a/arch/um/include/asm/Kbuild b/arch/um/include/asm/Kbuild index 398006d27e40..db7d9d4e30d8 100644 --- a/arch/um/include/asm/Kbuild +++ b/arch/um/include/asm/Kbuild @@ -25,5 +25,4 @@ generic-y += switch_to.h generic-y += topology.h generic-y += trace_clock.h generic-y += word-at-a-time.h -generic-y += xor.h generic-y += kprobes.h diff --git a/arch/um/include/asm/xor.h b/arch/um/include/asm/xor.h new file mode 100644 index 000000000000..7a3208c47cfc --- /dev/null +++ b/arch/um/include/asm/xor.h @@ -0,0 +1,7 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#include <asm-generic/xor.h> +#include <shared/timer-internal.h> + +/* pick an arbitrary one - measuring isn't possible with inf-cpu */ +#define XOR_SELECT_TEMPLATE(x) \ + (time_travel_mode == TT_MODE_INFCPU ? &xor_block_8regs : NULL) |