From: Suresh Siddha Date: Mon, 8 Oct 2012 23:28:29 +0000 (-0700) Subject: x86, pat: separate the pfn attribute tracking for remap_pfn_range and vm_insert_pfn X-Git-Tag: v3.7-rc1~74^2~151 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5180da410db6369d1f95c9014da1c9bc33fb043e;p=pandora-kernel.git x86, pat: separate the pfn attribute tracking for remap_pfn_range and vm_insert_pfn With PAT enabled, vm_insert_pfn() looks up the existing pfn memory attribute and uses it. Expectation is that the driver reserves the memory attributes for the pfn before calling vm_insert_pfn(). remap_pfn_range() (when called for the whole vma) will setup a new attribute (based on the prot argument) for the specified pfn range. This addresses the legacy usage which typically calls remap_pfn_range() with a desired memory attribute. For ranges smaller than the vma size (which is typically not the case), remap_pfn_range() will use the existing memory attribute for the pfn range. Expose two different API's for these different behaviors. track_pfn_insert() for tracking the pfn attribute set by vm_insert_pfn() and track_pfn_remap() for the remap_pfn_range(). This cleanup also prepares the ground for the track/untrack pfn vma routines to take over the ownership of setting PAT specific vm_flag in the 'vma'. [khlebnikov@openvz.org: Clear checks in track_pfn_remap()] [akpm@linux-foundation.org: tweak a few comments] Signed-off-by: Suresh Siddha Signed-off-by: Konstantin Khlebnikov Cc: Venkatesh Pallipadi Cc: H. Peter Anvin Cc: Nick Piggin Cc: Ingo Molnar Cc: Alexander Viro Cc: Carsten Otte Cc: Chris Metcalf Cc: Cyrill Gorcunov Cc: Eric Paris Cc: Hugh Dickins Cc: James Morris Cc: Jason Baron Cc: Kentaro Takeda Cc: Konstantin Khlebnikov Cc: Matt Helsley Cc: Oleg Nesterov Cc: Peter Zijlstra Cc: Robert Richter Cc: Suresh Siddha Cc: Tetsuo Handa Acked-by: Linus Torvalds Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- Reading git-diff-tree failed