iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

lib/test_bitmap.c: add optimisation tests

Browse Source 
Patch series "Bitmap optimisations", v2.

These three bitmap patches use more efficient specialisations when the
compiler can figure out that it's safe to do so.  Thanks to Rasmus's
eagle eyes, a nasty bug in v1 was avoided, and I've added a test case
which would have caught it.

This patch (of 4):

This version of the test is actually a no-op; the next patch will enable
it.

Link: http://lkml.kernel.org/r/20170628153221.11322-2-willy@infradead.org
Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com>
Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Matthew Wilcox <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Matthew Wilcox 2017-07-10 15:51:26 -07:00 committed by Linus Torvalds
parent b689d4a72f
commit 3cc78125a0
1 changed files with 32 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
lib/test_bitmap.c
View File

@ -333,10 +333,42 @@ static void __init test_bitmap_u32_array_conversions(void)
} }
} }
#define __bitmap_set(a, b, c) bitmap_set(a, b, c)
#define __bitmap_clear(a, b, c) bitmap_clear(a, b, c)
static void noinline __init test_mem_optimisations(void)
{
DECLARE_BITMAP(bmap1, 1024);
DECLARE_BITMAP(bmap2, 1024);
unsigned int start, nbits;
for (start = 0; start < 1024; start += 8) {
memset(bmap1, 0x5a, sizeof(bmap1));
memset(bmap2, 0x5a, sizeof(bmap2));
for (nbits = 0; nbits < 1024 - start; nbits += 8) {
bitmap_set(bmap1, start, nbits);
__bitmap_set(bmap2, start, nbits);
if (!bitmap_equal(bmap1, bmap2, 1024))
printk("set not equal %d %d\n", start, nbits);
if (!__bitmap_equal(bmap1, bmap2, 1024))
printk("set not __equal %d %d\n", start, nbits);
bitmap_clear(bmap1, start, nbits);
__bitmap_clear(bmap2, start, nbits);
if (!bitmap_equal(bmap1, bmap2, 1024))
printk("clear not equal %d %d\n", start, nbits);
if (!__bitmap_equal(bmap1, bmap2, 1024))
printk("clear not __equal %d %d\n", start,
nbits);
}
}
}
static int __init test_bitmap_init(void) static int __init test_bitmap_init(void)
{ {
test_zero_fill_copy(); test_zero_fill_copy();
test_bitmap_u32_array_conversions(); test_bitmap_u32_array_conversions();
test_mem_optimisations();
if (failed_tests == 0) if (failed_tests == 0)
pr_info("all %u tests passed\n", total_tests); pr_info("all %u tests passed\n", total_tests);