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authorJohannes Berg <johannes.berg@intel.com>2019-12-13 12:01:28 +0300
committerRichard Weinberger <richard@nod.at>2020-01-20 00:42:06 +0300
commitd65197ad52494bed3b5e64708281b8295f76c391 (patch)
tree6b62b3fc956ae45c2bcc417f3bebe92dcef5a2a3 /arch/um
parent87c9366e17259040a9118e06b6dc8de986e5d3d1 (diff)
downloadlinux-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/Kconfig2
-rw-r--r--arch/um/include/asm/Kbuild1
-rw-r--r--arch/um/include/asm/xor.h7
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)