Re: [PATCH v3 2/5] mtrr, x86: Fix MTRR lookup to handle inclusive entry

From: Ingo Molnar
Date: Mon Mar 16 2015 - 03:50:09 EST

* Toshi Kani <toshi.kani@xxxxxx> wrote:

> When an MTRR entry is inclusive to a requested range, i.e.
> the start and end of the request are not within the MTRR
> entry range but the range contains the MTRR entry entirely,
> __mtrr_type_lookup() ignores such a case because both
> start_state and end_state are set to zero.
> This patch fixes the issue by adding a new flag, 'inclusive',
> to detect the case. This case is then handled in the same
> way as (!start_state && end_state).

It would be nice to discuss the high level effects of this fix in the
changelog: i.e. what (presumably bad thing) happened before the
change, what will happen after the change? What did users experience
before the patch, and what will users experience after the patch?


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