Re: [uml-devel] [patch 094/241] uml: fix error output during early boot

[Blaisorblade <blaisorblade@yahoo.it>]

On Saturday 10 February 2007 10:44, akpm@linux-foundation.org wrote:
> From: Jeff Dike <jdike@addtoit.com>
>
> The startup code panics a lot if anything goes wrong early on.  This is
> wrong for several reasons, like the kernel isn't running, so you can't
> really be calling into it yet, but the harm comes from useful error
> messages being trapped in the printk ring where no one will ever see them.
>
> This patch changes these panics to perror and printf in wrappers which also
> exit.  Normal, informational, prints are also wrapped so that
> fflush(stdout) is called after each one.  This is so the output appears in
> the correct sequence in the event of an error.

libc's printf has an enormous stack usage, so that my_printf is used for 
direct output instead of printf; if this is ok because it's bootup code, then 
*fatal* should be marked as "bootup code only"; otherwise we may reuse 
vsprintf() and write() or fputs(); this should match what happens in 
my_printf, to avoid any unlikely problem with libc's buffering.
-- 
Inform me of my mistakes, so I can add them to my list!
Paolo Giarrusso, aka Blaisorblade
http://www.user-mode-linux.org/~blaisorblade
Chiacchiera con i tuoi amici in tempo reale! 
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