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Message-ID: <27cef66b-df5b-0baa-abac-5532e58bd055@c-s.fr>
Date: Fri, 31 Jan 2020 17:15:20 +0100
From: Christophe Leroy <christophe.leroy@....fr>
To: Segher Boessenkool <segher@...nel.crashing.org>
Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Paul Mackerras <paulus@...ba.org>,
Michael Ellerman <mpe@...erman.id.au>,
linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] powerpc/32s: Don't flush all TLBs when flushing one page
Le 31/01/2020 à 16:51, Segher Boessenkool a écrit :
> On Fri, Jan 31, 2020 at 03:37:34PM +0000, Christophe Leroy wrote:
>> When the range is a single page, do a page flush instead.
>
>> + start &= PAGE_MASK;
>> + end = (end - 1) | ~PAGE_MASK;
>> if (!Hash) {
>> - _tlbia();
>> + if (end - start == PAGE_SIZE)
>> + _tlbie(start);
>> + else
>> + _tlbia();
>> return;
>> }
>
> For just one page, you get end - start == 0 actually?
>
>
Oops, good catch.
Indeed you don't get PAGE_SIZE but (PAGE_SIZE - 1) for just one page.
Christophe
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