linux-kernel - [PATCH 5/7] vgacon: cache vc_cell_height in vgacon

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20230712085942.5064-6-jirislaby@kernel.org>
Date:   Wed, 12 Jul 2023 10:59:40 +0200
From:   "Jiri Slaby (SUSE)" <jirislaby@...nel.org>
To:     gregkh@...uxfoundation.org
Cc:     linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Jiri Slaby (SUSE)" <jirislaby@...nel.org>,
        Helge Deller <deller@....de>, linux-fbdev@...r.kernel.org,
        dri-devel@...ts.freedesktop.org
Subject: [PATCH 5/7] vgacon: cache vc_cell_height in vgacon_cursor()

There are many places c->vc_cell_height is used in the code of
vgacon_cursor(). Caching the value to a local variable makes the code
much easier to follow.

Signed-off-by: Jiri Slaby (SUSE) <jirislaby@...nel.org>
Cc: Helge Deller <deller@....de>
Cc: linux-fbdev@...r.kernel.org
Cc: dri-devel@...ts.freedesktop.org
---
 drivers/video/console/vgacon.c | 34 +++++++++++++++-------------------
 1 file changed, 15 insertions(+), 19 deletions(-)

diff --git a/drivers/video/console/vgacon.c b/drivers/video/console/vgacon.c
index 07f6b97d9b81..7ad047bcae17 100644
--- a/drivers/video/console/vgacon.c
+++ b/drivers/video/console/vgacon.c
@@ -470,11 +470,15 @@ static void vgacon_set_cursor_size(int from, int to)
 
 static void vgacon_cursor(struct vc_data *c, int mode)
 {
+	unsigned int c_height;
+
 	if (c->vc_mode != KD_TEXT)
 		return;
 
 	vgacon_restore_screen(c);
 
+	c_height = c->vc_cell_height;
+
 	switch (mode) {
 	case CM_ERASE:
 		write_vga(14, (c->vc_pos - vga_vram_base) / 2);
@@ -489,30 +493,22 @@ static void vgacon_cursor(struct vc_data *c, int mode)
 		write_vga(14, (c->vc_pos - vga_vram_base) / 2);
 		switch (CUR_SIZE(c->vc_cursor_type)) {
 		case CUR_UNDERLINE:
-			vgacon_set_cursor_size(c->vc_cell_height -
-					       (c->vc_cell_height <
-						10 ? 2 : 3),
-					       c->vc_cell_height -
-					       (c->vc_cell_height <
-						10 ? 1 : 2));
+			vgacon_set_cursor_size(c_height -
+					       (c_height < 10 ? 2 : 3),
+					       c_height -
+					       (c_height < 10 ? 1 : 2));
 			break;
 		case CUR_TWO_THIRDS:
-			vgacon_set_cursor_size(c->vc_cell_height / 3,
-					       c->vc_cell_height -
-					       (c->vc_cell_height <
-						10 ? 1 : 2));
+			vgacon_set_cursor_size(c_height / 3, c_height -
+					       (c_height < 10 ? 1 : 2));
 			break;
 		case CUR_LOWER_THIRD:
-			vgacon_set_cursor_size((c->vc_cell_height * 2) / 3,
-					       c->vc_cell_height -
-					       (c->vc_cell_height <
-						10 ? 1 : 2));
+			vgacon_set_cursor_size(c_height * 2 / 3, c_height -
+					       (c_height < 10 ? 1 : 2));
 			break;
 		case CUR_LOWER_HALF:
-			vgacon_set_cursor_size(c->vc_cell_height / 2,
-					       c->vc_cell_height -
-					       (c->vc_cell_height <
-						10 ? 1 : 2));
+			vgacon_set_cursor_size(c_height / 2, c_height -
+					       (c_height < 10 ? 1 : 2));
 			break;
 		case CUR_NONE:
 			if (vga_video_type >= VIDEO_TYPE_VGAC)
@@ -521,7 +517,7 @@ static void vgacon_cursor(struct vc_data *c, int mode)
 				vgacon_set_cursor_size(31, 31);
 			break;
 		default:
-			vgacon_set_cursor_size(1, c->vc_cell_height);
+			vgacon_set_cursor_size(1, c_height);
 			break;
 		}
 		break;
-- 
2.41.0