diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/video/console/Kconfig | 12 | ||||
| -rw-r--r-- | drivers/video/console/vgacon.c | 25 |
2 files changed, 19 insertions, 18 deletions
diff --git a/drivers/video/console/Kconfig b/drivers/video/console/Kconfig index f500e58f7636..5b71bd905a60 100644 --- a/drivers/video/console/Kconfig +++ b/drivers/video/console/Kconfig @@ -47,14 +47,16 @@ config VGACON_SOFT_SCROLLBACK_SIZE buffers of VGA consoles. Each 64KB will give you approximately 16 80x25 screenfuls of scrollback buffer. -config VGACON_SOFT_SCROLLBACK_PERSISTENT - bool "Persistent Scrollback History for each console" +config VGACON_SOFT_SCROLLBACK_PERSISTENT_ENABLE_BY_DEFAULT + bool "Persistent Scrollback History for each console by default" depends on VGACON_SOFT_SCROLLBACK default n help - Say Y here if the scrollback history should persist when switching - between consoles. Otherwise, the scrollback history will be flushed - each time the console is switched. + Say Y here if the scrollback history should persist by default when + switching between consoles. Otherwise, the scrollback history will be + flushed each time the console is switched. This feature can also be + enabled using the boot command line parameter + 'vgacon.scrollback_persistent=1'. This feature might break your tool of choice to flush the scrollback buffer, e.g. clear(1) will work fine but Debian's clear_console(1) diff --git a/drivers/video/console/vgacon.c b/drivers/video/console/vgacon.c index ca23d222e029..dc06cb6a15dc 100644 --- a/drivers/video/console/vgacon.c +++ b/drivers/video/console/vgacon.c @@ -174,11 +174,11 @@ struct vgacon_scrollback_info { }; static struct vgacon_scrollback_info *vgacon_scrollback_cur; -#ifdef CONFIG_VGACON_SOFT_SCROLLBACK_PERSISTENT static struct vgacon_scrollback_info vgacon_scrollbacks[MAX_NR_CONSOLES]; -#else -static struct vgacon_scrollback_info vgacon_scrollbacks[1]; -#endif +static bool scrollback_persistent = \ + IS_ENABLED(CONFIG_VGACON_SOFT_SCROLLBACK_PERSISTENT_ENABLE_BY_DEFAULT); +module_param_named(scrollback_persistent, scrollback_persistent, bool, 0000); +MODULE_PARM_DESC(scrollback_persistent, "Enable persistent scrollback for all vga consoles"); static void vgacon_scrollback_reset(int vc_num, size_t reset_size) { @@ -213,20 +213,19 @@ static void vgacon_scrollback_init(int vc_num) static void vgacon_scrollback_switch(int vc_num) { -#ifndef CONFIG_VGACON_SOFT_SCROLLBACK_PERSISTENT - vc_num = 0; -#endif + if (!scrollback_persistent) + vc_num = 0; if (!vgacon_scrollbacks[vc_num].data) { vgacon_scrollback_init(vc_num); } else { -#ifdef CONFIG_VGACON_SOFT_SCROLLBACK_PERSISTENT - vgacon_scrollback_cur = &vgacon_scrollbacks[vc_num]; -#else - size_t size = CONFIG_VGACON_SOFT_SCROLLBACK_SIZE * 1024; + if (scrollback_persistent) { + vgacon_scrollback_cur = &vgacon_scrollbacks[vc_num]; + } else { + size_t size = CONFIG_VGACON_SOFT_SCROLLBACK_SIZE * 1024; - vgacon_scrollback_reset(vc_num, size); -#endif + vgacon_scrollback_reset(vc_num, size); + } } } |
