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    Subject[PATCH] CON_BOOT

    New console flag: CON_BOOT

    CON_BOOT is like early printk in that it allows for output really
    early on. It's better than early printk because it unregisters
    automatically when a real console is initialised. So if you don't get
    consoles registering in console_init, there isn't a huge delay between
    the boot console unregistering and the real console starting. This is
    the case on PA-RISC where we have serial ports that aren't discovered
    until the PCI bus has been walked.

    I think all the current early printk users could be converted to this
    scheme with a minimal amount of effort.

    diff -urpNX dontdiff linus-2.6/include/linux/console.h parisc-2.6/include/linux/console.h
    --- linus-2.6/include/linux/console.h 2005-03-02 04:35:07.000000000 -0700
    +++ parisc-2.6/include/linux/console.h 2005-03-02 04:25:54.000000000 -0700
    @@ -84,6 +84,7 @@ void give_up_console(const struct consw
    #define CON_PRINTBUFFER (1)
    #define CON_CONSDEV (2) /* Last on the command line */
    #define CON_ENABLED (4)
    +#define CON_BOOT (8)

    struct console
    {
    diff -urpNX dontdiff linus-2.6/kernel/printk.c parisc-2.6/kernel/printk.c
    --- linus-2.6/kernel/printk.c 2005-03-02 04:35:10.000000000 -0700
    +++ parisc-2.6/kernel/printk.c 2005-03-15 09:20:32.339891098 -0700
    @@ -804,6 +804,11 @@ void register_console(struct console * c
    if (!(console->flags & CON_ENABLED))
    return;

    + if (console_drivers && (console_drivers->flags & CON_BOOT)) {
    + unregister_console(console_drivers);
    + console->flags &= ~CON_PRINTBUFFER;
    + }
    +
    /*
    * Put this console in the list - keep the
    * preferred driver at the head of the list.
    --
    "Next the statesmen will invent cheap lies, putting the blame upon
    the nation that is attacked, and every man will be glad of those
    conscience-soothing falsities, and will diligently study them, and refuse
    to examine any refutations of them; and thus he will by and by convince
    himself that the war is just, and will thank God for the better sleep
    he enjoys after this process of grotesque self-deception." -- Mark Twain
    -
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