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authorWei Yang <richard.weiyang@gmail.com>2020-06-10 18:41:53 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2020-06-10 19:14:18 -0700
commit6af132f3a11e6d2d9032ce51c882aa5933543255 (patch)
tree69ed7de53d02a3f0760794d896ebb0c4a5f2da5d /lib
parent496df3d3ab8a407f83330fb8d7160a5f91898c55 (diff)
lib: test get_count_order/long in test_bitops.c
Add some tests for get_count_order/long in test_bitops.c. [akpm@linux-foundation.org: define local `i'] [akpm@linux-foundation.org: enhancement, warning fix, cleanup per Geert] [akpm@linux-foundation.org: fix loop bound, per Wei Yang] Signed-off-by: Wei Yang <richard.weiyang@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Cc: Christian Brauner <christian.brauner@ubuntu.com> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Link: http://lkml.kernel.org/r/20200602223728.32722-1-richard.weiyang@gmail.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib')
-rw-r--r--lib/Kconfig.debug10
-rw-r--r--lib/test_bitops.c53
2 files changed, 56 insertions, 7 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index cb98741601bd..5beec9c833ce 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -2052,15 +2052,15 @@ config TEST_LKM
If unsure, say N.
config TEST_BITOPS
- tristate "Test module for compilation of clear_bit/set_bit operations"
+ tristate "Test module for compilation of bitops operations"
depends on m
help
This builds the "test_bitops" module that is much like the
TEST_LKM module except that it does a basic exercise of the
- clear_bit and set_bit macros to make sure there are no compiler
- warnings from C=1 sparse checker or -Wextra compilations. It has
- no dependencies and doesn't run or load unless explicitly requested
- by name. for example: modprobe test_bitops.
+ set/clear_bit macros and get_count_order/long to make sure there are
+ no compiler warnings from C=1 sparse checker or -Wextra
+ compilations. It has no dependencies and doesn't run or load unless
+ explicitly requested by name. for example: modprobe test_bitops.
If unsure, say N.
diff --git a/lib/test_bitops.c b/lib/test_bitops.c
index fd50b3ae4a14..ced25e3a779b 100644
--- a/lib/test_bitops.c
+++ b/lib/test_bitops.c
@@ -9,7 +9,11 @@
#include <linux/module.h>
#include <linux/printk.h>
-/* a tiny module only meant to test set/clear_bit */
+/* a tiny module only meant to test
+ *
+ * set/clear_bit
+ * get_count_order/long
+ */
/* use an enum because thats the most common BITMAP usage */
enum bitops_fun {
@@ -24,14 +28,59 @@ enum bitops_fun {
static DECLARE_BITMAP(g_bitmap, BITOPS_LENGTH);
+static unsigned int order_comb[][2] = {
+ {0x00000003, 2},
+ {0x00000004, 2},
+ {0x00001fff, 13},
+ {0x00002000, 13},
+ {0x50000000, 31},
+ {0x80000000, 31},
+ {0x80003000, 32},
+};
+
+#ifdef CONFIG_64BIT
+static unsigned long order_comb_long[][2] = {
+ {0x0000000300000000, 34},
+ {0x0000000400000000, 34},
+ {0x00001fff00000000, 45},
+ {0x0000200000000000, 45},
+ {0x5000000000000000, 63},
+ {0x8000000000000000, 63},
+ {0x8000300000000000, 64},
+};
+#endif
+
static int __init test_bitops_startup(void)
{
+ int i;
+
pr_warn("Loaded test module\n");
set_bit(BITOPS_4, g_bitmap);
set_bit(BITOPS_7, g_bitmap);
set_bit(BITOPS_11, g_bitmap);
set_bit(BITOPS_31, g_bitmap);
set_bit(BITOPS_88, g_bitmap);
+
+ for (i = 0; i < ARRAY_SIZE(order_comb); i++) {
+ if (order_comb[i][1] != get_count_order(order_comb[i][0]))
+ pr_warn("get_count_order wrong for %x\n",
+ order_comb[i][0]);
+ }
+
+ for (i = 0; i < ARRAY_SIZE(order_comb); i++) {
+ if (order_comb[i][1] != get_count_order_long(order_comb[i][0]))
+ pr_warn("get_count_order_long wrong for %x\n",
+ order_comb[i][0]);
+ }
+
+#ifdef CONFIG_64BIT
+ for (i = 0; i < ARRAY_SIZE(order_comb_long); i++) {
+ if (order_comb_long[i][1] !=
+ get_count_order_long(order_comb_long[i][0]))
+ pr_warn("get_count_order_long wrong for %lx\n",
+ order_comb_long[i][0]);
+ }
+#endif
return 0;
}
@@ -55,6 +104,6 @@ static void __exit test_bitops_unstartup(void)
module_init(test_bitops_startup);
module_exit(test_bitops_unstartup);
-MODULE_AUTHOR("Jesse Brandeburg <jesse.brandeburg@intel.com>");
+MODULE_AUTHOR("Jesse Brandeburg <jesse.brandeburg@intel.com>, Wei Yang <richard.weiyang@gmail.com>");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Bit testing module");