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SubjectRe: [PATCH 05/10] ksm: no debug in page_dup_rmap()
Izik Eidus wrote:
> From: Hugh Dickins <>
> page_dup_rmap(), used on each mapped page when forking, was originally
> just an inline atomic_inc of mapcount. 2.6.22 added CONFIG_DEBUG_VM
> out-of-line checks to it, which would need to be ever-so-slightly
> complicated to allow for the PageKsm() we're about to define.
> But I think these checks never caught anything. And if it's coding
> errors we're worried about, such checks should be in page_remove_rmap()
> too, not just when forking; whereas if it's pagetable corruption we're
> worried about, then they shouldn't be limited to CONFIG_DEBUG_VM.

Acked-by: Rik van Riel <>

All rights reversed.

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