From 69331af79cf29e26d1231152a172a1a10c2df511 Mon Sep 17 00:00:00 2001 From: Gerd Hoffmann Date: Tue, 8 May 2007 00:26:49 -0700 Subject: Fixes and cleanups for earlyprintk aka boot console The console subsystem already has an idea of a boot console, using the CON_BOOT flag. The implementation has some flaws though. The major problem is that presence of a boot console makes register_console() ignore any other console devices (unless explicitly specified on the kernel command line). This patch fixes the console selection code to *not* consider a boot console a full-featured one, so the first non-boot console registering will become the default console instead. This way the unregister call for the boot console in the register_console() function actually triggers and the handover from the boot console to the real console device works smoothly. Added a printk for the handover, so you know which console device the output goes to when the boot console stops printing messages. The disable_early_printk() call is obsolete with that patch, explicitly disabling the early console isn't needed any more as it works automagically with that patch. I've walked through the tree, dropped all disable_early_printk() instances found below arch/ and tagged the consoles with CON_BOOT if needed. The code is tested on x86, sh (thanks to Paul) and mips (thanks to Ralf). Changes to last version: Rediffed against -rc3, adapted to mips cleanups by Ralf, fixed "udbg-immortal" cmd line arg on powerpc. Signed-off-by: Gerd Hoffmann Acked-by: Paul Mundt Acked-by: Ralf Baechle Cc: Andi Kleen Cc: Alan Cox Cc: Richard Henderson Cc: Ivan Kokshaysky Cc: Paul Mackerras Cc: Benjamin Herrenschmidt Cc: Jeremy Fitzhardinge Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/alpha/kernel/setup.c | 9 --------- arch/alpha/kernel/srmcons.c | 2 +- arch/mips/kernel/early_printk.c | 5 ----- arch/powerpc/kernel/udbg.c | 19 ++++++------------- arch/sh/kernel/early_printk.c | 18 ++++++------------ arch/sh64/kernel/early_printk.c | 8 +------- arch/x86_64/kernel/early_printk.c | 20 +++++--------------- 7 files changed, 19 insertions(+), 62 deletions(-) (limited to 'arch') diff --git a/arch/alpha/kernel/setup.c b/arch/alpha/kernel/setup.c index d352c2b05f1..915f26345c4 100644 --- a/arch/alpha/kernel/setup.c +++ b/arch/alpha/kernel/setup.c @@ -744,15 +744,6 @@ setup_arch(char **cmdline_p) paging_init(); } -void __init -disable_early_printk(void) -{ - if (alpha_using_srm && srmcons_output) { - unregister_srm_console(); - srmcons_output = 0; - } -} - static char sys_unknown[] = "Unknown"; static char systype_names[][16] = { "0", diff --git a/arch/alpha/kernel/srmcons.c b/arch/alpha/kernel/srmcons.c index 85a821aaceb..930cedc8be2 100644 --- a/arch/alpha/kernel/srmcons.c +++ b/arch/alpha/kernel/srmcons.c @@ -300,7 +300,7 @@ static struct console srmcons = { .write = srm_console_write, .device = srm_console_device, .setup = srm_console_setup, - .flags = CON_PRINTBUFFER, + .flags = CON_PRINTBUFFER | CON_BOOT, .index = -1, }; diff --git a/arch/mips/kernel/early_printk.c b/arch/mips/kernel/early_printk.c index 304efdc5682..4fa54b230c0 100644 --- a/arch/mips/kernel/early_printk.c +++ b/arch/mips/kernel/early_printk.c @@ -33,8 +33,3 @@ void __init setup_early_printk(void) { register_console(&early_console); } - -void __init disable_early_printk(void) -{ - unregister_console(&early_console); -} diff --git a/arch/powerpc/kernel/udbg.c b/arch/powerpc/kernel/udbg.c index 7e0971868fc..147a2d83de1 100644 --- a/arch/powerpc/kernel/udbg.c +++ b/arch/powerpc/kernel/udbg.c @@ -142,29 +142,22 @@ static void udbg_console_write(struct console *con, const char *s, static struct console udbg_console = { .name = "udbg", .write = udbg_console_write, - .flags = CON_PRINTBUFFER | CON_ENABLED, + .flags = CON_PRINTBUFFER | CON_ENABLED | CON_BOOT, .index = -1, }; static int early_console_initialized; -void __init disable_early_printk(void) -{ - if (!early_console_initialized) - return; - if (strstr(boot_command_line, "udbg-immortal")) { - printk(KERN_INFO "early console immortal !\n"); - return; - } - unregister_console(&udbg_console); - early_console_initialized = 0; -} - /* called by setup_system */ void register_early_udbg_console(void) { if (early_console_initialized) return; + + if (strstr(boot_command_line, "udbg-immortal")) { + printk(KERN_INFO "early console immortal !\n"); + udbg_console.flags &= ~CON_BOOT; + } early_console_initialized = 1; register_console(&udbg_console); } diff --git a/arch/sh/kernel/early_printk.c b/arch/sh/kernel/early_printk.c index 9048c0326d8..9833493d886 100644 --- a/arch/sh/kernel/early_printk.c +++ b/arch/sh/kernel/early_printk.c @@ -192,20 +192,14 @@ int __init setup_early_printk(char *buf) } #endif - if (likely(early_console)) + if (likely(early_console)) { + if (keep_early) + early_console->flags &= ~CON_BOOT; + else + early_console->flags |= CON_BOOT; register_console(early_console); + } return 0; } early_param("earlyprintk", setup_early_printk); - -void __init disable_early_printk(void) -{ - if (!early_console_initialized || !early_console) - return; - if (!keep_early) { - printk("disabling early console\n"); - unregister_console(early_console); - } else - printk("keeping early console\n"); -} diff --git a/arch/sh64/kernel/early_printk.c b/arch/sh64/kernel/early_printk.c index 8c8a76e180a..4f913112367 100644 --- a/arch/sh64/kernel/early_printk.c +++ b/arch/sh64/kernel/early_printk.c @@ -79,7 +79,7 @@ static struct console sh_console = { .name = "scifcon", .write = sh_console_write, .setup = sh_console_setup, - .flags = CON_PRINTBUFFER, + .flags = CON_PRINTBUFFER | CON_BOOT, .index = -1, }; @@ -97,9 +97,3 @@ void __init enable_early_printk(void) register_console(&sh_console); } - -void disable_early_printk(void) -{ - unregister_console(&sh_console); -} - diff --git a/arch/x86_64/kernel/early_printk.c b/arch/x86_64/kernel/early_printk.c index 92213d2b7c1..56eaa259782 100644 --- a/arch/x86_64/kernel/early_printk.c +++ b/arch/x86_64/kernel/early_printk.c @@ -243,22 +243,12 @@ static int __init setup_early_printk(char *buf) early_console = &simnow_console; keep_early = 1; } + + if (keep_early) + early_console->flags &= ~CON_BOOT; + else + early_console->flags |= CON_BOOT; register_console(early_console); return 0; } - early_param("earlyprintk", setup_early_printk); - -void __init disable_early_printk(void) -{ - if (!early_console_initialized || !early_console) - return; - if (!keep_early) { - printk("disabling early console\n"); - unregister_console(early_console); - early_console_initialized = 0; - } else { - printk("keeping early console\n"); - } -} - -- cgit v1.2.3-70-g09d2