Question on IS_ERR — Linux Kernel

I saw we call IS_ERR(ptr) after executing kthread_run() each time.
But we don't need to call IS_ERR(ptr) after kmalloc().

My understanding is,
the kernel pointer ptr for IS_ERR to check should be page aligned, so
its kernel address should be less than 0xfffff000(or 0xffff ffff ffff
f000, 64bits),

kthread_run returns a struct task_struct pointer,which is always page aligned,
however the pointer returned by kmalloc() might not be page aligned,
so we cannot use IS_ERR to check.

Is my understanding correct?

Thanks
Jason
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Follow-Ups:
- Re: Question on IS_ERR
  - From: "H. Peter Anvin" <[email protected]>

Prev by Date: Re: [PATCH 4/5 -v2] Added generic lg.h in the include/linux directory
Next by Date: Re: Introducing paravirt_ops for x86_64
Previous by thread: Question : sched_rt.c : Loss of stats?? requeue_task_rt() does not call update_curr_rt() which updates stats
Next by thread: Re: Question on IS_ERR
Index(es):
- Date
- Thread

[Index of Archives] [Kernel Newbies] [Netfilter] [Bugtraq] [Photo] [Stuff] [Gimp] [Yosemite News] [MIPS Linux] [ARM Linux] [Linux Security] [Linux RAID] [Video 4 Linux] [Linux for the blind] [Linux Resources]