diff options
| author | Jiri Slaby (SUSE) <jirislaby@kernel.org> | 2023-01-12 11:01:36 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-01-19 17:06:42 +0300 |
| commit | bf8baa00668dbc4fcfca5ac49ae8a3059c795e4e (patch) | |
| tree | 5ee3dd968d223c90d6cdfa9ccc0a52c223e21609 /drivers/tty/vt/vt.c | |
| parent | 424c82af26b1b8ca6c0be06987a4e6d18c9a92dd (diff) | |
| download | linux-bf8baa00668dbc4fcfca5ac49ae8a3059c795e4e.tar.xz | |
tty: vt: cache row count in con_scroll()
It's used on few places, so make the code easier to follow by caching
the subtraction result.
Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20230112080136.4929-11-jirislaby@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/vt/vt.c')
| -rw-r--r-- | drivers/tty/vt/vt.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c index e3f62fffbdd5..71f182416835 100644 --- a/drivers/tty/vt/vt.c +++ b/drivers/tty/vt/vt.c @@ -561,10 +561,11 @@ static void con_scroll(struct vc_data *vc, unsigned int top, unsigned int bottom, enum con_scroll dir, unsigned int nr) { + unsigned int rows = bottom - top; u16 *clear, *dst, *src; if (top + nr >= bottom) - nr = bottom - top - 1; + nr = rows - 1; if (bottom > vc->vc_rows || top >= bottom || nr < 1) return; @@ -577,10 +578,10 @@ static void con_scroll(struct vc_data *vc, unsigned int top, dst = (u16 *)(vc->vc_origin + vc->vc_size_row * (top + nr)); if (dir == SM_UP) { - clear = src + (bottom - top - nr) * vc->vc_cols; + clear = src + (rows - nr) * vc->vc_cols; swap(src, dst); } - scr_memmovew(dst, src, (bottom - top - nr) * vc->vc_size_row); + scr_memmovew(dst, src, (rows - nr) * vc->vc_size_row); scr_memsetw(clear, vc->vc_video_erase_char, vc->vc_size_row * nr); } |