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igt/gem_exec_alignment: Fix off-by-one in evalation of find_last_bit()

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Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2016-01-19 21:11:28 +00:00
parent 6cf9d911ab
commit 28c33c6f90
1 changed files with 4 additions and 4 deletions
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8
tests/gem_exec_alignment.c
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@ -85,10 +85,10 @@ static void many(int fd)
if (count > file_max()) /* vfs cap */ if (count > file_max()) /* vfs cap */
count = file_max(); count = file_max();
max_alignment = find_last_bit(gtt_size / count); max_alignment = find_last_bit(gtt_size / count);
if (max_alignment <= 12) if (max_alignment <= 13)
max_alignment = 4096; max_alignment = 4096;
else else
max_alignment = 1ull << max_alignment; max_alignment = 1ull << (max_alignment - 1);
count = gtt_size / max_alignment / 2; count = gtt_size / max_alignment / 2;
igt_info("gtt_size=%lld MiB, max-alignment=%lld, count=%lld\n", igt_info("gtt_size=%lld MiB, max-alignment=%lld, count=%lld\n",
@ -125,7 +125,7 @@ static void many(int fd)
igt_debug("testing %lld x alignment=%#llx [%db]\n", igt_debug("testing %lld x alignment=%#llx [%db]\n",
(long long)execbuf.buffer_count - 1, (long long)execbuf.buffer_count - 1,
(long long)alignment, (long long)alignment,
find_last_bit(alignment)); find_last_bit(alignment)-1);
gem_execbuf(fd, &execbuf); gem_execbuf(fd, &execbuf);
for (i = 0; i < count; i++) for (i = 0; i < count; i++)
igt_assert_eq_u64(execobj[i].alignment, alignment); igt_assert_eq_u64(execobj[i].alignment, alignment);
@ -185,7 +185,7 @@ static void single(int fd)
igt_debug("starting offset: %#llx, next alignment: %#llx [%db]\n", igt_debug("starting offset: %#llx, next alignment: %#llx [%db]\n",
(long long)execobj.offset, (long long)execobj.offset,
(long long)execobj.alignment, (long long)execobj.alignment,
find_last_bit(execobj.alignment)); find_last_bit(execobj.alignment)-1);
gem_execbuf(fd, &execbuf); gem_execbuf(fd, &execbuf);
igt_assert_eq_u64(execobj.offset % execobj.alignment, 0); igt_assert_eq_u64(execobj.offset % execobj.alignment, 0);
} }