[Bug 568441] [NEW] mtrr: your BIOS has set up an incorrect mask, fixing it up.

[Alessandro Bono]

Public bug reported:

Hi

I have upgraded one of my proliant ml 350 g5 from hardy to karmic and
now to lucid, starting from karmic appears this warning on dmesg

WARNING: at /build/buildd/linux-2.6.32/arch/x86/kernel/cpu/mtrr/generic.c:467 generic_get_mtrr+0x11e/0x140()
[    7.155329] Hardware name: ProLiant ML350 G5
[    7.155331] mtrr: your BIOS has set up an incorrect mask, fixing it up.
[    7.155333] Modules linked in: fbcon tileblit font bitblit softcursor vga16fb vgastate radeon ttm i5000_edac bnx2(+) drm_kms_helper edac_core lp psmouse drm ipmi_si(+) i5k_amb serio_raw i2c_algo_bit kvm_intel floppy(+) ipmi_msghandler hpilo shpchp kvm parport xfs exportfs usbhid hid e1000e cciss
[    7.155361] Pid: 455, comm: plymouthd Not tainted 2.6.32-21-server #32-Ubuntu
[    7.155363] Call Trace:
[    7.155370]  [<ffffffff81066d1b>] warn_slowpath_common+0x7b/0xc0
[    7.155373]  [<ffffffff81066dc1>] warn_slowpath_fmt+0x41/0x50
[    7.155377]  [<ffffffff81028d0e>] generic_get_mtrr+0x11e/0x140
[    7.155381]  [<ffffffff8102788b>] mtrr_add_page+0xdb/0x3f0
[    7.155384]  [<ffffffff81027bf6>] mtrr_add+0x56/0x70
[    7.155400]  [<ffffffffa01c91e9>] drm_addmap_core+0x659/0x800 [drm]
[    7.155408]  [<ffffffffa01c942a>] drm_addmap+0x1a/0x30 [drm]
[    7.155427]  [<ffffffffa0261abd>] radeon_driver_firstopen+0x5d/0x70 [radeon]
[    7.155436]  [<ffffffffa01cba43>] drm_setup+0x23/0x1a0 [drm]
[    7.155444]  [<ffffffffa01cc052>] drm_open+0x102/0x120 [drm]
[    7.155452]  [<ffffffffa01cc1a3>] drm_stub_open+0x133/0x260 [drm]
[    7.155459]  [<ffffffff8114702a>] chrdev_open+0x13a/0x240
[    7.155462]  [<ffffffff81146ef0>] ? chrdev_open+0x0/0x240
[    7.155466]  [<ffffffff81141393>] __dentry_open+0x113/0x370
[    7.155471]  [<ffffffff8125192f>] ? security_inode_permission+0x1f/0x30
[    7.155474]  [<ffffffff8114d6ff>] ? inode_permission+0xaf/0xd0
[    7.155478]  [<ffffffff81141707>] nameidata_to_filp+0x57/0x70
[    7.155481]  [<ffffffff8115193a>] do_filp_open+0x2da/0xba0
[    7.155486]  [<ffffffff8115d2da>] ? alloc_fd+0x10a/0x150
[    7.155489]  [<ffffffff81141109>] do_sys_open+0x69/0x170
[    7.155492]  [<ffffffff81141250>] sys_open+0x20/0x30
[    7.155497]  [<ffffffff810131b2>] system_call_fastpath+0x16/0x1b
[    7.155499] ---[ end trace 36b5203afece7194 ]---


cat /proc/mtrr 
reg00: base=0x0e0000000 ( 3584MB), size=  512MB, count=1: uncachable

another identical machine but with ubuntu hardy, kernel 2.6.24-26-xen
has this mtrr

cat /proc/mtrr 
reg00: base=0xe0000000 (3584MB), size=197120MB: uncachable, count=0

Is it a bios problem? Have I to fill a bug to HP support or newer kernel
are incorrect?

thanks

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

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mtrr: your BIOS has set up an incorrect mask, fixing it up. 
https://bugs.launchpad.net/bugs/568441
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