From: Ralf Baechle <ralf@linux-mips.org>
To: Wu Zhangjin <wuzhangjin@gmail.com>
Cc: linux-mips@linux-mips.org, "Rafael J. Wysocki" <rjw@sisk.pl>,
Pavel Machek <pavel@ucw.cz>
Subject: Re: [PATCH] MIPS: fix pfn_valid() for FLAGMEM
Date: Thu, 8 Oct 2009 20:50:12 +0200 [thread overview]
Message-ID: <20091008185012.GA10365@linux-mips.org> (raw)
In-Reply-To: <1255016760.14496.57.camel@falcon>
On Thu, Oct 08, 2009 at 11:46:00PM +0800, Wu Zhangjin wrote:
> > Are the non-memory parts marked as reserved?
> >
> No, so, is that a need to mark them?
Initially all pages are marked as reserved.
Which seems to be good enough for x86:
$ cat /proc/iomem
00000000-0009efff : System RAM
0009f000-0009ffff : reserved
000c0000-000cffff : pnp 00:0d
000e0000-000fffff : pnp 00:0d
00100000-7fe5b7ff : System RAM
[...]
The 0x9f000 - 0x9ffff range is the good old ISA I/O memory range (classic
MDA/CGA/VGA etc.), that is non-memory yet:
#ifdef CONFIG_FLATMEM
#define pfn_valid(pfn) ((pfn) < max_mapnr)
#endif /* CONFIG_FLATMEM */
is sufficient on x86 so I think something else must be wrong.
Ralf
next prev parent reply other threads:[~2009-10-08 18:49 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-10-08 8:57 [PATCH] MIPS: fix pfn_valid() for FLAGMEM Wu Zhangjin
2009-10-08 9:29 ` Pavel Machek
2009-10-08 10:33 ` Wu Zhangjin
2009-10-08 10:36 ` Pavel Machek
2009-10-08 10:57 ` Wu Zhangjin
2009-10-08 9:58 ` Sergei Shtylyov
2009-10-08 10:36 ` Wu Zhangjin
2009-10-08 14:42 ` Ralf Baechle
2009-10-08 15:46 ` Wu Zhangjin
2009-10-08 18:50 ` Ralf Baechle [this message]
2009-10-09 15:43 ` Sergei Shtylyov
2009-10-09 15:48 ` Sergei Shtylyov
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