From: "Ilpo Järvinen" <ilpo.jarvinen@linux.intel.com>
To: "Jiri Slaby (SUSE)" <jirislaby@kernel.org>
Cc: gregkh@linuxfoundation.org, Kees Cook <keescook@chromium.org>,
linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 11/11] tty: vt: cache row count in con_scroll()
Date: Thu, 12 Jan 2023 12:00:06 +0200 (EET) [thread overview]
Message-ID: <629b305a-bc9c-7dfa-907-c96d7e676f74@linux.intel.com> (raw)
In-Reply-To: <20230112080136.4929-11-jirislaby@kernel.org>
[-- Attachment #1: Type: text/plain, Size: 1432 bytes --]
On Thu, 12 Jan 2023, Jiri Slaby (SUSE) wrote:
> 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>
> ---
> drivers/tty/vt/vt.c | 7 ++++---
> 1 file changed, 4 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c
> index 165c81211bdc..671304b31f9f 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);
> }
>
>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
--
i.
next prev parent reply other threads:[~2023-01-12 10:02 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-01-12 8:01 [PATCH 01/11] tty: vt: remove vc_uniscr_debug_check() Jiri Slaby (SUSE)
2023-01-12 8:01 ` [PATCH 02/11] tty: vt: drop get_vc_uniscr() Jiri Slaby (SUSE)
2023-01-12 8:41 ` Ilpo Järvinen
2023-01-12 8:01 ` [PATCH 03/11] tty: vt: remove reference to undefined NO_VC_UNI_SCREEN Jiri Slaby (SUSE)
2023-01-12 8:44 ` Ilpo Järvinen
2023-01-12 8:01 ` [PATCH 04/11] tty: vt: use sizeof(*variable) where possible Jiri Slaby (SUSE)
2023-01-12 8:58 ` Ilpo Järvinen
2023-01-12 8:01 ` [PATCH 05/11] tty: vt: remove char32_t typedef Jiri Slaby (SUSE)
2023-01-12 8:52 ` Ilpo Järvinen
2023-01-12 9:34 ` Ilpo Järvinen
2023-01-12 8:01 ` [PATCH 06/11] tty: vt: remove struct uni_screen Jiri Slaby (SUSE)
2023-01-12 9:42 ` Ilpo Järvinen
2023-01-12 8:01 ` [PATCH 07/11] tty: vt: replace BUG_ON() by WARN_ON_ONCE() Jiri Slaby (SUSE)
2023-01-12 9:42 ` Ilpo Järvinen
2023-01-12 8:01 ` [PATCH 08/11] tty: vt: simplify some unicode conditions Jiri Slaby (SUSE)
2023-01-12 9:52 ` Ilpo Järvinen
2023-01-12 8:01 ` [PATCH 09/11] tty: vt: separate array juggling to juggle_array() Jiri Slaby (SUSE)
2023-01-12 10:15 ` Ilpo Järvinen
2023-01-12 8:01 ` [PATCH 10/11] tty: vt: saner names for more scroll variables Jiri Slaby (SUSE)
2023-01-12 9:59 ` Ilpo Järvinen
2023-01-12 8:01 ` [PATCH 11/11] tty: vt: cache row count in con_scroll() Jiri Slaby (SUSE)
2023-01-12 10:00 ` Ilpo Järvinen [this message]
2023-01-12 8:43 ` [PATCH 01/11] tty: vt: remove vc_uniscr_debug_check() Ilpo Järvinen
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