tree edd1a2c287b7d98ee7b62e7ea6457c8a10abe016
parent 3bfacef412b4bc993a8992217e50f1245f2fd3a6
author Linus Torvalds <torvalds@linux-foundation.org> 1231011977 -0800
committer Linus Torvalds <torvalds@linux-foundation.org> 1231011977 -0800

Make %p print '(null)' for NULL pointers

Before, when we only ever printed out the pointer value itself, a NULL
pointer would never cause issues and might as well be printed out as
just its numeric value.

However, with the extended %p formats, especially %pR, we might validly
want to print out resources for debugging.  And sometimes they don't
even exist, and the resource pointer is just NULL.  Print it out as
such, rather than oopsing.

This is a more generic version of a patch done by Trent Piepho (catching
all %p cases rather than just %pR, and using "(null)" instead of
"[NULL]" to match glibc).

Requested-by: Trent Piepho <xyzzy@speakeasy.org>
Acked-by: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>