linux-kernel - [RFC 2/3] SGI Altix cross partition memory (XPMEM)

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Message-ID: <20070810011245.GC25427@sgi.com>
Date:	Thu, 9 Aug 2007 20:12:45 -0500
From:	Dean Nelson <dcn@....com>
To:	linux-ia64@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, tony.luck@...el.com, jes@....com
Subject: [RFC 2/3] SGI Altix cross partition memory (XPMEM)

This patch exports zap_page_range as it is needed by XPMEM.

Signed-off-by: Dean Nelson <dcn@....com>

---

XPMEM would have used sys_madvise() except that madvise_dontneed()
madvise_dontneed() returns an -EINVAL if VM_PFNMAP is set, which is
always true for the pages XPMEM imports from other partitions and is
also true for uncached pages allocated locally via the mspec allocator.
XPMEM needs zap_page_range() functionality for these types of pages as
well as 'normal' pages.

Index: linux-2.6/mm/memory.c
===================================================================
--- linux-2.6.orig/mm/memory.c	2007-08-09 07:07:55.762651612 -0500
+++ linux-2.6/mm/memory.c	2007-08-09 07:15:43.226389312 -0500
@@ -894,6 +894,7 @@
 		tlb_finish_mmu(tlb, address, end);
 	return end;
 }
+EXPORT_SYMBOL_GPL(zap_page_range);

 /*
  * Do a quick page-table lookup for a single page.
-
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