linux-kernel - Re: [PATCH] x86: mm: Remove unnecessary assignment for max_pfn

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Message-ID: <CAE9FiQVpbDJT2Ma6MHkB5aF9PUuGCia_QaLc_LjYCLJb4nKebg@mail.gmail.com>
Date:	Fri, 10 May 2013 02:27:13 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Zhang Yanfei <zhangyanfei@...fujitsu.com>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: mm: Remove unnecessary assignment for max_pfn_mapped:q

On Fri, May 10, 2013 at 2:01 AM, Zhang Yanfei
<zhangyanfei@...fujitsu.com> wrote:
> init_memory_mapping will set max_pfn_mapped:
> int_memory_mapping
>   --> add_pfn_range_mapped
>     --> max_pfn_mapped = max(max_pfn_mapped, end_pfn)
>
> In init_mem_mapping, before we set max_pfn_mapped to 0, we
> have already called init_memory_mapping to setup pagetable
> for [0, ISA_END_ADDRESS], and that sets max_pfn_mapped. So
> the assignment to 0 is not necessary, remove it.

NAK.

for 32bit or Xen, max_pfn_mapped is set way before in head_32.S and
xen-enlighen.

Yinghai
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