linux-kernel - Question on IS

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Message-ID: <4104961b0708082236if0c1199l2bbc468e9d582a08@mail.gmail.com>
Date:	Thu, 9 Aug 2007 13:36:45 +0800
From:	"jidong xiao" <jidong.xiao@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: Question on IS_ERR

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
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