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-rw-r--r--include/linux/raid/pq.h3
-rw-r--r--lib/Kconfig8
-rw-r--r--lib/raid6/algos.c5
3 files changed, 16 insertions, 0 deletions
diff --git a/include/linux/raid/pq.h b/include/linux/raid/pq.h
index d7c99161bba2..605cf46c17bd 100644
--- a/include/linux/raid/pq.h
+++ b/include/linux/raid/pq.h
@@ -70,6 +70,9 @@ extern const char raid6_empty_zero_page[PAGE_SIZE];
#define MODULE_DESCRIPTION(desc)
#define subsys_initcall(x)
#define module_exit(x)
+
+#define IS_ENABLED(x) (x)
+#define CONFIG_RAID6_PQ_BENCHMARK 1
#endif /* __KERNEL__ */
/* Routine choices */
diff --git a/lib/Kconfig b/lib/Kconfig
index a9965f4af4dd..fcb05305a5a2 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -10,6 +10,14 @@ menu "Library routines"
config RAID6_PQ
tristate
+config RAID6_PQ_BENCHMARK
+ bool "Automatically choose fastest RAID6 PQ functions"
+ depends on RAID6_PQ
+ default y
+ help
+ Benchmark all available RAID6 PQ functions on init and choose the
+ fastest one.
+
config BITREVERSE
tristate
diff --git a/lib/raid6/algos.c b/lib/raid6/algos.c
index a753ff56670f..7e4f7a8ffa8e 100644
--- a/lib/raid6/algos.c
+++ b/lib/raid6/algos.c
@@ -163,6 +163,11 @@ static inline const struct raid6_calls *raid6_choose_gen(
if ((*algo)->valid && !(*algo)->valid())
continue;
+ if (!IS_ENABLED(CONFIG_RAID6_PQ_BENCHMARK)) {
+ best = *algo;
+ break;
+ }
+
perf = 0;
preempt_disable();