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

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Date:   Tue, 15 Oct 2019 18:40:27 +0200
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Frank Rowand <frank.rowand@...sony.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH RT] Revert "ARM: Initialize split page table locks for
 vector page"

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