| To: | Wu Zhangjin <wuzhangjin@gmail.com> |
|---|---|
| Subject: | Re: [PATCH] MIPS: fix pfn_valid() for FLAGMEM |
| From: | Ralf Baechle <ralf@linux-mips.org> |
| Date: | Thu, 8 Oct 2009 20:50:12 +0200 |
| Cc: | linux-mips@linux-mips.org, "Rafael J. Wysocki" <rjw@sisk.pl>, Pavel Machek <pavel@ucw.cz> |
| In-reply-to: | <1255016760.14496.57.camel@falcon> |
| Original-recipient: | rfc822;linux-mips@linux-mips.org |
| References: | <1254992252-15923-1-git-send-email-wuzhangjin@gmail.com> <20091008144230.GA682@linux-mips.org> <1255016760.14496.57.camel@falcon> |
| Sender: | linux-mips-bounce@linux-mips.org |
| User-agent: | Mutt/1.5.19 (2009-01-05) |
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 |
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