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    SubjectRe: [PATCH] Document kfree and vfree NULL usage
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    On Sat, Nov 27, 2004 at 04:26:00PM +0200, Pekka Enberg wrote:
    > > This patch adds comments for kfree() and vfree() stating that both accept
    > > NULL pointers. I audited vfree() callers and there seems to be lots of
    > > confusion over this in the kernel.

    On Sat, 2004-11-27 at 23:39 +0000, John Levon wrote:
    > Erm, are you sure about this? Somebody had to patch OProfile because
    > vfree() didn't like NULL value being passed in. When did this change?

    Yes, I am sure. vfree() calls __vunmap() which returns immediately if
    the passed pointer is NULL. I don't know when this changed.

    Pekka

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