linux-kernel - [PATCH 2/2] console: fix up ARM screen

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Date:   Tue, 17 Oct 2023 11:39:47 +0200
From:   Arnd Bergmann <arnd@...nel.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-fbdev@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, loongarch@...ts.linux.dev,
        linux-arm-kernel@...ts.infradead.org,
        Javier Martinez Canillas <javierm@...hat.com>,
        Ard Biesheuvel <ardb@...nel.org>, Helge Deller <deller@....de>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Arnd Bergmann <arnd@...db.de>
Subject: [PATCH 2/2] console: fix up ARM screen_info reference

From: Arnd Bergmann <arnd@...db.de>

Separating the VGA console screen_info from the EFI one unfortunately
caused a build failure for footbridge that I had never caught
with randconfig builds:

arch/arm/kernel/setup.c:932:27: error: static declaration of 'vgacon_screen_info' follows non-static declaration
  932 | static struct screen_info vgacon_screen_info = {
      |                           ^~~~~~~~~~~~~~~~~~
In file included from arch/arm/kernel/setup.c:44:
arch/arm/include/asm/setup.h:40:27: note: previous declaration of 'vgacon_screen_info' with type 'struct screen_info'
   40 | extern struct screen_info vgacon_screen_info;
      |                           ^~~~~~~~~~~~~~~~~~
arm-linux-gnueabi-ld: drivers/video/console/dummycon.o: in function `dummycon_init':
dummycon.c:(.text+0xe4): undefined reference to `screen_info'

Make sure the variable is global to avoid the conflict with the extern
declaration, and make it work in dummycon.c

Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
Greg, this was caused by patch "vgacon: clean up global screen_info
instances" in tty-testing. You can either apply this patch on top or fold
it into that, or I can just resend the fixed series if you prefer.
---
 arch/arm/include/asm/vga.h       | 1 +
 arch/arm/kernel/setup.c          | 2 +-
 drivers/video/console/dummycon.c | 5 +++--
 3 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/arch/arm/include/asm/vga.h b/arch/arm/include/asm/vga.h
index 7c0bee57855ab..6c430ec371df2 100644
--- a/arch/arm/include/asm/vga.h
+++ b/arch/arm/include/asm/vga.h
@@ -5,6 +5,7 @@
 #include <linux/io.h>
 
 extern unsigned long vga_base;
+extern struct screen_info vgacon_screen_info;
 
 #define VGA_MAP_MEM(x,s)	(vga_base + (x))
 
diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
index b808712e85981..ff2299ce1ad7a 100644
--- a/arch/arm/kernel/setup.c
+++ b/arch/arm/kernel/setup.c
@@ -929,7 +929,7 @@ static void __init request_standard_resources(const struct machine_desc *mdesc)
 }
 
 #if defined(CONFIG_VGA_CONSOLE)
-static struct screen_info vgacon_screen_info = {
+struct screen_info vgacon_screen_info = {
  .orig_video_lines	= 30,
  .orig_video_cols	= 80,
  .orig_video_mode	= 0,
diff --git a/drivers/video/console/dummycon.c b/drivers/video/console/dummycon.c
index 70549fecee12c..14af5d9e13b00 100644
--- a/drivers/video/console/dummycon.c
+++ b/drivers/video/console/dummycon.c
@@ -19,8 +19,9 @@
  */
 
 #if defined(CONFIG_ARCH_FOOTBRIDGE) && defined(CONFIG_VGA_CONSOLE)
-#define DUMMY_COLUMNS	screen_info.orig_video_cols
-#define DUMMY_ROWS	screen_info.orig_video_lines
+#include <asm/vga.h>
+#define DUMMY_COLUMNS	vgacon_screen_info.orig_video_cols
+#define DUMMY_ROWS	vgacon_screen_info.orig_video_lines
 #else
 /* set by Kconfig. Use 80x25 for 640x480 and 160x64 for 1280x1024 */
 #define DUMMY_COLUMNS	CONFIG_DUMMY_CONSOLE_COLUMNS
-- 
2.39.2