linux/arch/powerpc
Christoph Lameter 50953fe9e0 slab allocators: Remove SLAB_DEBUG_INITIAL flag
I have never seen a use of SLAB_DEBUG_INITIAL.  It is only supported by
SLAB.

I think its purpose was to have a callback after an object has been freed
to verify that the state is the constructor state again?  The callback is
performed before each freeing of an object.

I would think that it is much easier to check the object state manually
before the free.  That also places the check near the code object
manipulation of the object.

Also the SLAB_DEBUG_INITIAL callback is only performed if the kernel was
compiled with SLAB debugging on.  If there would be code in a constructor
handling SLAB_DEBUG_INITIAL then it would have to be conditional on
SLAB_DEBUG otherwise it would just be dead code.  But there is no such code
in the kernel.  I think SLUB_DEBUG_INITIAL is too problematic to make real
use of, difficult to understand and there are easier ways to accomplish the
same effect (i.e.  add debug code before kfree).

There is a related flag SLAB_CTOR_VERIFY that is frequently checked to be
clear in fs inode caches.  Remove the pointless checks (they would even be
pointless without removeal of SLAB_DEBUG_INITIAL) from the fs constructors.

This is the last slab flag that SLUB did not support.  Remove the check for
unimplemented flags from SLUB.

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-05-07 12:12:57 -07:00
..
boot [POWERPC] Add dt_xlate_addr() to bootwrapper 2007-04-30 11:02:05 +10:00
configs [POWERPC] Rename MPIC_BROKEN_U3 to MPIC_U3_HT_IRQS 2007-04-24 22:06:58 +10:00
kernel serial: define FIXED_PORT flag for serial_core 2007-05-07 12:12:50 -07:00
lib Merge branch 'linux-2.6' into for-2.6.22 2007-04-30 12:38:01 +10:00
math-emu
mm get_unmapped_area handles MAP_FIXED on powerpc 2007-05-07 12:12:55 -07:00
oprofile [POWERPC] Spinlock initializer cleanup 2007-04-30 11:02:06 +10:00
platforms slab allocators: Remove SLAB_DEBUG_INITIAL flag 2007-05-07 12:12:57 -07:00
sysdev Merge branch 'for-2.6.22' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc 2007-04-30 08:10:12 -07:00
xmon [POWERPC] Fix WARN_ON when entering xmon 2007-04-27 21:13:28 +10:00
.gitignore
Kconfig PowerPC: Disable SLUB for configurations in which slab page structs are modified 2007-05-07 12:12:53 -07:00
Kconfig.debug [POWERPC] DEBUG_PAGEALLOC for 64-bit 2007-04-13 04:09:39 +10:00
Makefile [POWERPC] Enable make install 2007-04-27 21:13:43 +10:00