lkml.org 
[lkml]   [2008]   [Jul]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
SubjectRe: [Bug 11046] New: Kernel bug in mm/bootmem.c on Sparc machines
From
From: Johannes Weiner <hannes@saeurebad.de>
Date: Thu, 24 Jul 2008 23:32:06 +0200

> Sorry, Dave, I missed that before: there is still the BUG_ON() in
> can_reserve_bootmem_core(), which should just return 0 instead.
>
> Other than that, yes, Andrew, this introduces the same behaviour the
> bootmem rewrite.

Thanks, here is an updated version of the patch:

bootmem: Allow zero length reserve and free.

It's either this or all the call sites explicitly check
when such a case is possible and sometimes expected.

Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/mm/bootmem.c b/mm/bootmem.c
index 8d9f60e..5e3fab8 100644
--- a/mm/bootmem.c
+++ b/mm/bootmem.c
@@ -117,7 +117,8 @@ static int __init can_reserve_bootmem_core(bootmem_data_t *bdata,
unsigned long sidx, eidx;
unsigned long i;

- BUG_ON(!size);
+ if (!size)
+ return 0;

/* out of range, don't hold other */
if (addr + size < bdata->node_boot_start ||
@@ -153,7 +154,8 @@ static void __init reserve_bootmem_core(bootmem_data_t *bdata,
unsigned long sidx, eidx;
unsigned long i;

- BUG_ON(!size);
+ if (!size)
+ return;

/* out of range */
if (addr + size < bdata->node_boot_start ||
@@ -187,7 +189,8 @@ static void __init free_bootmem_core(bootmem_data_t *bdata, unsigned long addr,
unsigned long sidx, eidx;
unsigned long i;

- BUG_ON(!size);
+ if (!size)
+ return;

/* out range */
if (addr + size < bdata->node_boot_start ||

\
 
 \ /
  Last update: 2008-07-25 00:01    [W:0.036 / U:0.204 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site