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From
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SubjectRe: kiobugs in 2.3.48
Hi,

On Thu, 2 Mar 2000 11:53:19 +0530 (IST), V Ganesh <ganesh@veritas.com>
said:

> we do
> map = follow_page(ptr);
> to convert the userspace vaddr to a struct page *. right ?

Yes.

> where is it converted to a kernel virtual address ?

There is a one-to-one equivalence between kernel addresses and struct
page *s.

> then we do
> map = get_page_map(map, ptr);
> and now we pass this to get_page_map() which promptly returns 0,

Yikes. Yes, somebody snuck a completely bogus patch into 2.3.48. The
_only_ reason vaddr should be used in get_page_map() is to act as an
argument to ZERO_PAGE() for architectures in which the zero page is
cache-coloured.

This bug is not present in the patch I sent out last week. I'll submit
the fixes to Linus shortly.

--Stephen

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