Re: [PATCH RT] Revert "ARM: Initialize split page table locks for vector page"

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To: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Subject: Re: [PATCH RT] Revert "ARM: Initialize split page table locks for vector page"
From: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
Date: Tue, 15 Oct 2019 18:40:27 +0200
Cc: linux-kernel@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, Frank Rowand <frank.rowand@xxxxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Steven Rostedt <rostedt@xxxxxxxxxxx>
In-reply-to: <20191015162609.GH32665@bombadil.infradead.org>
References: <20191014160238.enawbbfcxnbdrlch@linutronix.de> <20191015162609.GH32665@bombadil.infradead.org>

On 2019-10-15 09:26:09 [-0700], Matthew Wilcox wrote:
> Did your test build have ALLOC_SPLIT_PTLOCKS defined?

I tried to explain that ptlock_ptr() returns NULL for the page before
the ctor invocation and non-NULL afterwards which means that
USE_SPLIT_PTE_PTLOCKS and ALLOC_SPLIT_PTLOCKS was defined.

Sebastian

References:
- [PATCH RT] Revert "ARM: Initialize split page table locks for vector page"
  - From: Sebastian Andrzej Siewior
- Re: [PATCH RT] Revert "ARM: Initialize split page table locks for vector page"
  - From: Matthew Wilcox

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