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lib/test_bitmap.c: add optimisation tests

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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
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32
lib/test_bitmap.c
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@ -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)
{
test_zero_fill_copy();
test_bitmap_u32_array_conversions();
test_mem_optimisations();
if (failed_tests == 0)
pr_info("all %u tests passed\n", total_tests);