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um: Fix time-travel=inf-cpu with xor/raid6

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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>
This commit is contained in:
Johannes Berg
2019-12-13 10:01:28 +01:00
committed by Richard Weinberger
parent 87c9366e17
commit d65197ad52
3 changed files with 9 additions and 1 deletions
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7
arch/um/include/asm/xor.h Normal file
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@@ -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)