From owner-freebsd-hackers@FreeBSD.ORG  Mon Jan  3 12:39:50 2005
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From: "Tejas Sumant" <tejas.sumant@gmail.com>
To: <freebsd-hackers@freebsd.org>
Date: Mon, 3 Jan 2005 18:09:45 +0530
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Subject: Freeing Volatile Pointer
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Hi,

I have a volatile pointer declared in my device driver.
I am allocating memory using kernel malloc function.

host_mem_resp_ptr = (volatile unsigned long *)malloc(sizeof(volatile
unsigned long), M_DEVBUF, M_NOWAIT);

When I try to free it, I get following warning while compiling the driver.

"warning: passing arg 1 of free discards qualifiers from pointer target
type"

The statment to free the memory is

free(host_mem_resp_ptr, M_DEVBUF);

Can anybody please tell me reason and solution?

Tejas