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Message-ID: <49CFC958.9010902@kernel.org> Date: Sun, 29 Mar 2009 12:17:44 -0700 From: Yinghai Lu <yinghai@...nel.org> To: "Morten P.D. Stevens" <mstevens@...-professional.com> CC: Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>, "H. Peter Anvin" <hpa@...or.com>, Arjan van de Ven <arjan@...radead.org>, linux-kernel@...r.kernel.org Subject: Re: warning in arch/x86/kernel/cpu/mtrr/generic.c:400 with 2.6.29-rc3 on IBM x3400 Morten P.D. Stevens wrote: > Hi, > >> so that bios need to be fixed too. > > a small update: > IBM said the BIOS-provided physical RAM map should be okay and they will not > release a new bios... IBM said, this is a linux problem triggered through > arch/x86/kernel/cpu/mtrr/... > > After installing and testing ubuntu server 9.04 (linux 2.6.28) i get this > warning/failure in dmesg: > > [ 0.000000] BIOS EBDA/lowmem at: 0009c400/0009c400 > [ 0.000000] Initializing cgroup subsys cpuset > [ 0.000000] Initializing cgroup subsys cpu > [ 0.000000] Linux version 2.6.28-11-server (buildd@...sted) (gcc version > 4.3.3 (Ubuntu 4.3.3-5ubuntu4) ) #37-Ubuntu SMP Mon Mar 23 17:33:24 UTC 2009 > (Ubuntu 2.6.28-11.37-server) > [ 0.000000] Command line: root=/dev/mapper/ubuntu--server-root ro quiet > splash > [ 0.000000] KERNEL supported cpus: > [ 0.000000] Intel GenuineIntel > [ 0.000000] AMD AuthenticAMD > [ 0.000000] Centaur CentaurHauls > [ 0.000000] BIOS-provided physical RAM map: > [ 0.000000] BIOS-e820: 0000000000000000 - 000000000009c400 (usable) > [ 0.000000] BIOS-e820: 000000000009c400 - 00000000000a0000 (reserved) > [ 0.000000] BIOS-e820: 00000000000e0000 - 0000000000100000 (reserved) > [ 0.000000] BIOS-e820: 0000000000100000 - 00000000bff60000 (usable) > [ 0.000000] BIOS-e820: 00000000bff60000 - 00000000bff6a000 (ACPI data) > [ 0.000000] BIOS-e820: 00000000bff6a000 - 00000000bff80000 (ACPI NVS) > [ 0.000000] BIOS-e820: 00000000bff80000 - 00000000c0000000 (reserved) > [ 0.000000] BIOS-e820: 00000000e0000000 - 00000000f0000000 (reserved) > [ 0.000000] BIOS-e820: 00000000fec00000 - 00000000fec10000 (reserved) > [ 0.000000] BIOS-e820: 00000000fee00000 - 00000000fee01000 (reserved) > [ 0.000000] BIOS-e820: 00000000ff000000 - 0000000100000000 (reserved) > [ 0.000000] BIOS-e820: 0000000100000000 - 0000000140000000 (usable) > [ 0.000000] DMI present. > [ 0.000000] last_pfn = 0x140000 max_arch_pfn = 0x3ffffffff > [ 0.000000] ------------[ cut here ]------------ > [ 0.000000] WARNING: at > /build/buildd/linux-2.6.28/arch/x86/kernel/cpu/mtrr/generic.c:411 > generic_get_mtrr+0xfa/0x130() > [ 0.000000] mtrr: your BIOS has set up an incorrect mask, fixing it up. > [ 0.000000] Modules linked in: > [ 0.000000] Pid: 0, comm: swapper Not tainted 2.6.28-11-server #37-Ubuntu > [ 0.000000] Call Trace: > [ 0.000000] [<ffffffff80250927>] warn_slowpath+0xb7/0xf0 > [ 0.000000] [<ffffffff8041ea88>] ? sprintf+0x68/0x70 > [ 0.000000] [<ffffffff8041e5d8>] ? vsnprintf+0x2e8/0x730 > [ 0.000000] [<ffffffff8069eaf8>] ? _spin_unlock_irqrestore+0x18/0x20 > [ 0.000000] [<ffffffff8069eaf8>] ? _spin_unlock_irqrestore+0x18/0x20 > [ 0.000000] [<ffffffff8025124d>] ? release_console_sem+0x1dd/0x230 > [ 0.000000] [<ffffffff8025172c>] ? vprintk+0x19c/0x400 > [ 0.000000] [<ffffffff80a1aa16>] ? dmi_save_one_device+0x79/0xb4 > [ 0.000000] [<ffffffff80220c6a>] generic_get_mtrr+0xfa/0x130 > [ 0.000000] [<ffffffff809f7215>] mtrr_trim_uncached_memory+0xa3/0x331 > [ 0.000000] [<ffffffff809f26c4>] setup_arch+0x5c6/0x902 > [ 0.000000] [<ffffffff80273822>] ? > clockevents_register_notifier+0x42/0x60 > [ 0.000000] [<ffffffff809e9b33>] start_kernel+0x6e/0x3b2 > [ 0.000000] [<ffffffff809e92b4>] x86_64_start_reservations+0x94/0xb9 > [ 0.000000] [<ffffffff809e93ee>] x86_64_start_kernel+0xf2/0x101 > [ 0.000000] [<ffffffff809e9140>] ? early_idt_handler+0x0/0x71 > [ 0.000000] ---[ end trace 4eaa2a86a8e2da22 ]--- > [ 0.000000] last_pfn = 0xbff60 max_arch_pfn = 0x3ffffffff > [ 0.000000] Scanning 2 areas for low memory corruption > [ 0.000000] modified physical RAM map: > [ 0.000000] modified: 0000000000000000 - 0000000000001000 (usable) > [ 0.000000] modified: 0000000000001000 - 0000000000006000 (reserved) > [ 0.000000] modified: 0000000000006000 - 0000000000008000 (usable) > [ 0.000000] modified: 0000000000008000 - 0000000000010000 (reserved) > [ 0.000000] modified: 0000000000010000 - 000000000008f400 (usable) > [ 0.000000] modified: 000000000009c400 - 00000000000a0000 (reserved) > [ 0.000000] modified: 00000000000e0000 - 0000000000100000 (reserved) > [ 0.000000] modified: 0000000000100000 - 00000000bff60000 (usable) > [ 0.000000] modified: 00000000bff60000 - 00000000bff6a000 (ACPI data) > [ 0.000000] modified: 00000000bff6a000 - 00000000bff80000 (ACPI NVS) > [ 0.000000] modified: 00000000bff80000 - 00000000c0000000 (reserved) > [ 0.000000] modified: 00000000e0000000 - 00000000f0000000 (reserved) > [ 0.000000] modified: 00000000fec00000 - 00000000fec10000 (reserved) > [ 0.000000] modified: 00000000fee00000 - 00000000fee01000 (reserved) > [ 0.000000] modified: 00000000ff000000 - 0000000100000000 (reserved) > [ 0.000000] modified: 0000000100000000 - 0000000140000000 (usable) > [ 0.000000] init_memory_mapping: 0000000000000000-00000000bff60000 > [ 0.000000] 0000000000 - 00bfe00000 page 2M > [ 0.000000] 00bfe00000 - 00bff60000 page 4k > [ 0.000000] kernel direct mapping tables up to bff60000 @ 10000-15000 > [ 0.000000] last_map_addr: bff60000 end: bff60000 > [ 0.000000] init_memory_mapping: 0000000100000000-0000000140000000 > [ 0.000000] 0100000000 - 0140000000 page 2M > [ 0.000000] kernel direct mapping tables up to 140000000 @ 13000-19000 > [ 0.000000] last_map_addr: 140000000 end: 140000000 > > root@...ntu-server:/# uname -a > Linux ubuntu-server 2.6.28-11-server #37-Ubuntu SMP Mon Mar 23 17:33:24 UTC > 2009 x86_64 GNU/Linux > > root@...ntu-server:/# cat /proc/mtrr > reg00: base=0x0c0000000 ( 3072MB), size= 1024MB, count=1: uncachable > reg01: base=0x000000000 ( 0MB), size= 4096MB, count=1: write-back > reg02: base=0x100000000 ( 4096MB), size= 1024MB, count=1: write-back > reg03: base=0x0bff80000 ( 3071MB), size= 512KB, count=1: uncachable that mean new kernel workaround the mask bits. you can try to set CONFIG_MTRR=y CONFIG_MTRR_SANITIZER=y CONFIG_MTRR_SANITIZER_ENABLE_DEFAULT=1 CONFIG_MTRR_SANITIZER_SPARE_REG_NR_DEFAULT=1 in your config it could make your Xserver happy. YH -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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