[lkml]   [2006]   [Jun]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: 2.6.17-mm1

Andrew Morton wrote:
> All 1738 patches:

Is the following patch really needed ?


The FLATMEM memory model assumes that memory is in one contigious area
based at pfn 0. If we initialise node 0 to start at any other offset we
will incorrectly map pfn's to the wrong struct page *. The key to the
memory model is the contigious nature of the memory not the location of it.
Relax the requirement for the area to start at 0.

Should ARCH_PFN_OFFSET macro be used instead in order to make pfn/page
convertions work when node 0 start offset do not start at 0 ?

My physical memory start at 0x20000000. So node 0 starts at an offset
different from 0. I setup ARCH_PFN_OFFSET this way

#define ARCH_PFN_OFFSET (0x20000000 << PAGE_SHIFT)

Until now (2.6.17), it works well, but this patch breaks my machine.

If you need more details about my memory mapping, feel free to ask.


To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2006-06-22 16:56    [W:0.341 / U:4.304 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site