From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Hugh Dickins <hugh@veritas.com>
Cc: Paul Mackerras <paulus@samba.org>, Andrew Morton <akpm@osdl.org>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 3/5] mm: powerpc ptlock comments
Date: Tue, 22 Nov 2005 18:57:51 +1100 [thread overview]
Message-ID: <1132646272.26560.224.camel@gaston> (raw)
In-Reply-To: <Pine.LNX.4.61.0511220705110.22267@goblin.wat.veritas.com>
On Tue, 2005-11-22 at 07:12 +0000, Hugh Dickins wrote:
> I'd appreciate something that updates the "because" part too, but don't
> know the answer. That other patch will need to come from your end - Ben?
Hrm... same reason as __hash_page(), the code now locks the PTE using
the _PAGE_BUSY bit. The last store does the update and unlock and
doesn't need to be atomic. However, now that I look at it, it might need
an lwsync. Paul ?
Ben.
next prev parent reply other threads:[~2005-11-22 8:00 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-11-21 20:31 [PATCH 0/5] mm: flotsam Hugh Dickins
2005-11-21 20:32 ` [PATCH 1/5] mm: update split ptlock Kconfig Hugh Dickins
2005-11-21 20:33 ` [PATCH 2/5] mm: unbloat get_futex_key Hugh Dickins
2005-11-21 20:35 ` [PATCH 3/5] mm: powerpc ptlock comments Hugh Dickins
2005-11-21 23:09 ` Paul Mackerras
2005-11-22 7:12 ` Hugh Dickins
2005-11-22 7:57 ` Benjamin Herrenschmidt [this message]
2005-11-21 20:36 ` [PATCH 4/5] mm: powerpc init_mm without ptlock Hugh Dickins
2005-11-21 20:38 ` [PATCH 5/5] mm: fill arch atomic64 gaps Hugh Dickins
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