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authorChris Wilson <chris@chris-wilson.co.uk>2016-12-22 14:45:14 +0000
committerDaniel Vetter <daniel.vetter@ffwll.ch>2016-12-27 12:30:56 +0100
commitcf4a7207b1cb4a3c3fe3aa11a83c9d673722a7f5 (patch)
tree664430c374186b63e808e08f65bca635747e14c9 /tools
parentb3ee963fe41d0034cf8b6aff1f0cc9c91bf8d478 (diff)
downloadlinux-cf4a7207b1cb4a3c3fe3aa11a83c9d673722a7f5.tar.bz2
lib: Add a simple prime number generator
Prime numbers are interesting for testing components that use multiplies and divides, such as testing DRM's struct drm_mm alignment computations. v2: Move to lib/, add selftest v3: Fix initial constants (exclude 0/1 from being primes) v4: More RCU markup to keep 0day/sparse happy v5: Fix RCU unwind on module exit, add to kselftests v6: Tidy computation of bitmap size v7: for_each_prime_number_from() v8: Compose small-primes using BIT() for easier verification v9: Move rcu dance entirely into callers. v10: Improve quote for Betrand's Postulate (aka Chebyshev's theorem) Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Lukas Wunner <lukas@wunner.de> Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: http://patchwork.freedesktop.org/patch/msgid/20161222144514.3911-1-chris@chris-wilson.co.uk
Diffstat (limited to 'tools')
-rwxr-xr-xtools/testing/selftests/lib/prime_numbers.sh15
1 files changed, 15 insertions, 0 deletions
diff --git a/tools/testing/selftests/lib/prime_numbers.sh b/tools/testing/selftests/lib/prime_numbers.sh
new file mode 100755
index 000000000000..da4cbcd766f5
--- /dev/null
+++ b/tools/testing/selftests/lib/prime_numbers.sh
@@ -0,0 +1,15 @@
+#!/bin/sh
+# Checks fast/slow prime_number generation for inconsistencies
+
+if ! /sbin/modprobe -q -r prime_numbers; then
+ echo "prime_numbers: [SKIP]"
+ exit 77
+fi
+
+if /sbin/modprobe -q prime_numbers selftest=65536; then
+ /sbin/modprobe -q -r prime_numbers
+ echo "prime_numbers: ok"
+else
+ echo "prime_numbers: [FAIL]"
+ exit 1
+fi