Re: kern/29360: vfs.generic.usermount and mount(8) general questions

[Thor Lancelot Simon <tls%panix.com@localhost>]

On Sun, Sep 06, 2009 at 09:23:19PM +0300, Antti Kantee wrote:
> 
> Apparently you can still make the system panic by just mounting a zillion
> kernfs's (which is just one way to make the kernel run out of memory).
> I think the problem is that somewhere along the line kmem_alloc(KM_SLEEP)
> returns NULL.  I remember there being discussions that the caller of
> kmem_alloc() should always check against NULL return, but that of course
> makes calling it slightly inconvenient.

Supposedly, allocations with KM_SLEEP won't return NULL, so code can
safely assume they don't.  I've been told at least once that it is bad
style to check...!

-- 
Thor Lancelot Simon                                        
tls%rek.tjls.com@localhost
    "Even experienced UNIX users occasionally enter rm *.* at the UNIX
     prompt only to realize too late that they have removed the wrong
     segment of the directory structure." - Microsoft WSS whitepaper