[Bugme-new] [Bug 11388] New: 2.6.27-rc3 warns about MTRR range; only 3 of 16gb of memory is usable

[bugme-daemon at bugzilla.kernel.org]

http://bugzilla.kernel.org/show_bug.cgi?id=11388

           Summary: 2.6.27-rc3 warns about MTRR range; only 3 of 16gb of
                    memory is usable
           Product: Memory Management
           Version: 2.5
     KernelVersion: 2.6.27-rc3
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: MTTR
        AssignedTo: akpm at osdl.org
        ReportedBy: j_kernel at hoblitt.com


Latest working kernel version: 2.4.24.2 (possibly later)
Earliest failing kernel version: 2.6.27-rc3-21328-ga7f5aaf (from netdev-2.6)
Distribution: Gentoo
Hardware Environment: 2x Intel X5482
Software Environment:
Problem Description:

[    0.000000] WARNING: BIOS bug: CPU MTRRs don't cover all of memory, losing
13056MB of RAM.
[    0.000000] ------------[ cut here ]------------
[    0.000000] WARNING: at arch/x86/kernel/cpu/mtrr/main.c:1561
mtrr_trim_uncached_memory+0x508/0x550()
[    0.000000] Modules linked in:
[    0.000000] Pid: 0, comm: swapper Not tainted 2.6.27-rc3-21328-ga7f5aaf #8
[    0.000000] 
[    0.000000] Call Trace:
[    0.000000]  [<ffffffff80234c3e>] warn_on_slowpath+0x51/0x77
[    0.000000]  [<ffffffff8023570a>] printk+0x4e/0x56
[    0.000000]  [<ffffffff803add02>] sort+0xfa/0x18c
[    0.000000]  [<ffffffff808283d3>] cmp_range+0x0/0x6
[    0.000000]  [<ffffffff80828a47>] mtrr_trim_uncached_memory+0x508/0x550
[    0.000000]  [<ffffffff802178e1>] post_set+0x20/0x3d
[    0.000000]  [<ffffffff80824f99>] setup_arch+0x39d/0x6be
[    0.000000]  [<ffffffff8081e962>] start_kernel+0x74/0x341
[    0.000000]  [<ffffffff8081e394>] x86_64_start_kernel+0xe3/0xe7
[    0.000000] 
[    0.000000] ---[ end trace 4eaa2a86a8e2da22 ]---


Steps to reproduce:

This warning isn't present under 2.6.24.2 and the full range of physical memory
is usable.


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