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powerpc/msi: Fix the msi bitmap alignment tests 

When we added the alignment tests recently we failed to check they were
actually passing - oops.

They weren't passing, because the bitmap was full. We should also be a
bit more careful when checking the return code, a negative error return
could by divisible by our alignment value.

Fixes: b0345bbc6d ("powerpc/msi: Improve IRQ bitmap allocator")
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Michael Ellerman 2014-10-10 19:04:24 +11:00
parent 179ea48bc7
commit 695911fb1f
1 changed files with 18 additions and 8 deletions
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26
arch/powerpc/sysdev/msi_bitmap.c
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@ -151,7 +151,7 @@ void msi_bitmap_free(struct msi_bitmap *bmp)
static void __init test_basics(void)
{
struct msi_bitmap bmp;
int i, size = 512;
int rc, i, size = 512;
/* Can't allocate a bitmap of 0 irqs */
check(msi_bitmap_alloc(&bmp, 0, NULL) != 0);
@ -185,14 +185,24 @@ static void __init test_basics(void)
msi_bitmap_free_hwirqs(&bmp, size / 2, 1);
check(msi_bitmap_alloc_hwirqs(&bmp, 1) == size / 2);
/* Free most of them for the alignment tests */
msi_bitmap_free_hwirqs(&bmp, 3, size - 3);
/* Check we get a naturally aligned offset */
check(msi_bitmap_alloc_hwirqs(&bmp, 2) % 2 == 0);
check(msi_bitmap_alloc_hwirqs(&bmp, 4) % 4 == 0);
check(msi_bitmap_alloc_hwirqs(&bmp, 8) % 8 == 0);
check(msi_bitmap_alloc_hwirqs(&bmp, 9) % 16 == 0);
check(msi_bitmap_alloc_hwirqs(&bmp, 3) % 4 == 0);
check(msi_bitmap_alloc_hwirqs(&bmp, 7) % 8 == 0);
check(msi_bitmap_alloc_hwirqs(&bmp, 121) % 128 == 0);
rc = msi_bitmap_alloc_hwirqs(&bmp, 2);
check(rc >= 0 && rc % 2 == 0);
rc = msi_bitmap_alloc_hwirqs(&bmp, 4);
check(rc >= 0 && rc % 4 == 0);
rc = msi_bitmap_alloc_hwirqs(&bmp, 8);
check(rc >= 0 && rc % 8 == 0);
rc = msi_bitmap_alloc_hwirqs(&bmp, 9);
check(rc >= 0 && rc % 16 == 0);
rc = msi_bitmap_alloc_hwirqs(&bmp, 3);
check(rc >= 0 && rc % 4 == 0);
rc = msi_bitmap_alloc_hwirqs(&bmp, 7);
check(rc >= 0 && rc % 8 == 0);
rc = msi_bitmap_alloc_hwirqs(&bmp, 121);
check(rc >= 0 && rc % 128 == 0);
msi_bitmap_free(&bmp);