| Message ID | 20220210224933.379149-35-yury.norov@gmail.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | None | expand |
On 10/02/2022 23:49, Yury Norov wrote: > tegra_channel_enum_format() calls bitmap_weight() to compare the weight > of bitmap with a given number. We can do it more efficiently with > bitmap_weight_le() because conditional bitmap_weight may stop traversing > the bitmap earlier, as soon as condition is (or can't be) met. > > Signed-off-by: Yury Norov <yury.norov@gmail.com> Acked-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> Regards, Hans > --- > drivers/staging/media/tegra-video/vi.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/staging/media/tegra-video/vi.c b/drivers/staging/media/tegra-video/vi.c > index d1f43f465c22..4e79a80e9307 100644 > --- a/drivers/staging/media/tegra-video/vi.c > +++ b/drivers/staging/media/tegra-video/vi.c > @@ -436,7 +436,7 @@ static int tegra_channel_enum_format(struct file *file, void *fh, > if (!IS_ENABLED(CONFIG_VIDEO_TEGRA_TPG)) > fmts_bitmap = chan->fmts_bitmap; > > - if (f->index >= bitmap_weight(fmts_bitmap, MAX_FORMAT_NUM)) > + if (bitmap_weight_le(fmts_bitmap, MAX_FORMAT_NUM, f->index)) > return -EINVAL; > > for (i = 0; i < f->index + 1; i++, index++)
diff --git a/drivers/staging/media/tegra-video/vi.c b/drivers/staging/media/tegra-video/vi.c index d1f43f465c22..4e79a80e9307 100644 --- a/drivers/staging/media/tegra-video/vi.c +++ b/drivers/staging/media/tegra-video/vi.c @@ -436,7 +436,7 @@ static int tegra_channel_enum_format(struct file *file, void *fh, if (!IS_ENABLED(CONFIG_VIDEO_TEGRA_TPG)) fmts_bitmap = chan->fmts_bitmap; - if (f->index >= bitmap_weight(fmts_bitmap, MAX_FORMAT_NUM)) + if (bitmap_weight_le(fmts_bitmap, MAX_FORMAT_NUM, f->index)) return -EINVAL; for (i = 0; i < f->index + 1; i++, index++)
tegra_channel_enum_format() calls bitmap_weight() to compare the weight of bitmap with a given number. We can do it more efficiently with bitmap_weight_le() because conditional bitmap_weight may stop traversing the bitmap earlier, as soon as condition is (or can't be) met. Signed-off-by: Yury Norov <yury.norov@gmail.com> --- drivers/staging/media/tegra-video/vi.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)