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

[Jeff Dike <jdike@addtoit.com>]

On Sat, Feb 10, 2007 at 01:31:20PM +0100, Blaisorblade wrote:
> 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, 

It is bootup code only.

> then *fatal* should be marked as "bootup code only"; 

OK.

> 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. 

Offhand, I would say that if we are on a kernel stack, printk is safe
to use, and should be used, so there's no need for things like
my_printf.  Maybe there are some exceptions in early boot when the
kernel is running, but before the console is working, but I can't
think of any problems we've had like that.

				Jeff

-- 
Work email - jdike at linux dot intel dot com

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