Re: [PATCH v2 3.18-rc3] kdb: Avoid printing KERN_ levels to consoles

[Joe Perches <joe@perches.com>]

On Fri, 2014-11-07 at 16:50 +0000, Daniel Thompson wrote:
> On 07/11/14 16:04, Joe Perches wrote:
> > why insert KERN_INFO?
> 
> vkdb_printf() and  printk() can appear either way round in a stack
> trace. Each is capable of calling the other and a flag (kdb_trap_printk)
> is used to prevent mutual recursion.

I see.

> A complete solution would require a means to know whether vkdb_printf()
> were entered directly or from printk(). A flag passed to vkdb_printf()
> would achieve this. I'll take a look.

That bit seems pretty simple and sensible.

I don't know this code at all but would it be better if
the kdb_trap_printk accesses were converted to atomic_<foo>?

Might this bit in vkdb_printf:

	saved_trap_printk = kdb_trap_printk;
	kdb_trap_printk = 0;

be better atomic_xchg?

and the kdb_trap_printk++ bits as atomic_inc, etc...