In generating the reference LRC, we want a page-aligned address for simplicity in computing the offsets within. This then shares the computation for the HW LRC which is mapped and so page aligned, making the comparison straightforward. It seems that kmalloc(4k) is not always returning from a 4k-aligned slab cache (which would give us a page aligned address) so force alignment by explicitly allocating a page. Reported-by: "Gote, Nitin R" <nitin.r.gote@xxxxxxxxx> Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> Cc: "Gote, Nitin R" <nitin.r.gote@xxxxxxxxx> --- drivers/gpu/drm/i915/gt/selftest_lrc.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/i915/gt/selftest_lrc.c b/drivers/gpu/drm/i915/gt/selftest_lrc.c index c8753559c44c..a885f2fb6e66 100644 --- a/drivers/gpu/drm/i915/gt/selftest_lrc.c +++ b/drivers/gpu/drm/i915/gt/selftest_lrc.c @@ -4761,7 +4761,7 @@ static int live_lrc_layout(void *arg) * match the layout saved by HW. */ - lrc = kmalloc(PAGE_SIZE, GFP_KERNEL); + lrc = (u32 *)__get_free_page(GFP_KERNEL); if (!lrc) return -ENOMEM; @@ -4850,7 +4850,7 @@ static int live_lrc_layout(void *arg) break; } - kfree(lrc); + free_page((unsigned long)lrc); return err; } -- 2.20.1 _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
