o:[EMAIL PROTECTED]
Sent: Tuesday, March 06, 2007 7:39 PM
To: Chen, Dongliang
Cc: linux-kernel@vger.kernel.org
Subject: Re: return negative number for unsigned long function in kernel
H. Peter Anvin wrote:
>If you want to test for errorness, you could use the macro
>IS_ERR_VALUE(). Unfortuna
There are lots of functions in the Linux kernel that are declared as
unsigned long, but the return value is negative integer while error
occurred. An example of these functions is do_mmap_pgoff in mm/mmap.c,
which is defined as:
unsigned long do_mmap_pgoff()
In this function, it returns -ENOD
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