linux-kernel - Re: [PATCH 08/10] vmalloc: add un/map_kernel_range

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Date:	Thu, 19 Feb 2009 23:17:27 +1100
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	Tejun Heo <tj@...nel.org>
Cc:	rusty@...tcorp.com.au, tglx@...utronix.de, x86@...nel.org,
	linux-kernel@...r.kernel.org, hpa@...or.com, jeremy@...p.org,
	cpw@....com, mingo@...e.hu
Subject: Re: [PATCH 08/10] vmalloc: add un/map_kernel_range_noflush()

On Wednesday 18 February 2009 23:04:34 Tejun Heo wrote:
> Impact: two more public map/unmap functions
>
> Implement map_kernel_range_noflush() and unmap_kernel_range_noflush().
> These functions respectively map and unmap address range in kernel VM
> area but doesn't do any vcache or tlb flushing.  These will be used by
> new percpu allocator.

Hmm... I have no real issues with this, although the caller is going
to have to be very careful not to introduce bugs (which I'm sure you
were ;)).

Maybe can you add comments specifying the minimum of which flushes
are required and when, to scare people away from using them?


>
> Signed-off-by: Tejun Heo <tj@...nel.org>
> ---
>  include/linux/vmalloc.h |    3 ++
>  mm/vmalloc.c            |   58
> ++++++++++++++++++++++++++++++++++++++++++++-- 2 files changed, 58
> insertions(+), 3 deletions(-)

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