question about alloc_bootmem

Dave Hylands dhylands at
Fri Apr 15 02:57:53 EDT 2011


On Thu, Apr 14, 2011 at 10:49 PM, javaweb zhang <javawebzwp at> wrote:
> Hello, everyone. I use alloc_bootmem() in profile.c to allocate a big memory
> at function profile_init(), how I know whether it is success? The following
> is my code:
> // at kernel/profile.c
> ctxsw_A = (struct ctxsw_rec *)alloc_bootmem(sizeof(struct ctxsw_rec)*CTXSW);
> ctxsw_rec is a struct which declared in include/linux/profile.h,  CTXSW =
> 4>>10

Looking at the source code for alloc_bootmem, it returns a NULL
pointer (which is what most allocators do when the allocation fails).
It appears that it will hit a panic first though, so you may never get
to the receiving the NULL.

Dave Hylands
Shuswap, BC, Canada

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