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[Xen-users] WARNING: at arch/x86/mm/ioremap.c:469 with 2.6.27?

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Subject: [Xen-users] WARNING: at arch/x86/mm/ioremap.c:469 with 2.6.27?
From: Tomasz Chmielewski <mangoo@xxxxxxxx>
Date: Tue, 14 Oct 2008 17:08:25 +0200
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I get the following (below) when starting a 2.6.27 domU kernel with Xen 3.2.1. What does it mean? Should I attach the .config? I didn't have this warning with 2.6.26. Can it be that it shows up because of CONFIG_X86_VERBOSE_BOOTUP (was added in 2.6.27 AFAIK).


Other than that, everything seems to work properly.


# xm create -c backup1
Using config file "/etc/xen/backup1".
Started domain backup1
                      Reserving virtual address space above 0xf57fe000
Linux version 2.6.27-1-xenU (root@backup1) (gcc version 4.2.3 (4.2.3-6mnb1)) #2 Tue Oct 14 11:26:51 CEST 2008 ------------[ cut here ]------------ WARNING: at arch/x86/mm/ioremap.c:469 early_ioremap_init+0x150/0x216() Modules linked in: Pid: 0, comm: swapper Not tainted 2.6.27-1-xenU #2 [<c011aa57>] warn_on_slowpath+0x41/0x65 [<c010379d>] ? xen_pmd_val+0x8/0xa [<c0110d90>] ? lookup_address+0x166/0x197 [<c0103611>] ? xen_mc_flush+0x102/0x139 [<c01041cc>] ? xen_set_pmd_hyper+0x61/0x6b [<c02f07d2>] early_ioremap_init+0x150/0x216 [<c02eec99>] ? early_cpu_init+0x176/0x17e [<c02ebdde>] setup_arch+0x2c/0x6fb [<c01ce11e>] ? raw_console_write+0x1e/0x35 [<c02edee8>] ? __reserve_early+0xc4/0xcc [<c011b408>] ? printk+0x15/0x17 [<c02e8793>] start_kernel+0x51/0x252 [<c02e8329>] i386_start_kernel+0x80/0x88 [<c02eb654>] xen_start_kernel+0x4f3/0x4fb ======================= ---[ end trace 4eaa2a86a8e2da22 ]--- pmd c0317d50 != c0317d58 fix_to_virt(FIX_BTMAP_BEGIN): f55fe000 fix_to_virt(FIX_BTMAP_END): f56fd000 FIX_BTMAP_END: 256 FIX_BTMAP_BEGIN: 511 BIOS-provided physical RAM map: Xen: 0000000000000000 - 00000000000a0000 (usable) Xen: 00000000000a0000 - 0000000000100000 (reserved) Xen: 0000000000100000 - 0000000000338000 (usable) Xen: 0000000000338000 - 0000000000601000 (reserved) Xen: 0000000000601000 - 00000000b1800000 (usable) last_pfn = 0xb1800 max_arch_pfn = 0x1000000 DMI not present or invalid. 2112MB HIGHMEM available. 727MB LOWMEM available. mapped low ram: 0 - 2d7fe000 low ram: 00000000 - 2d7fe000 bootmap 00001000 - 00006b00 (5 early reservations) ==> bootmem [0000000000 - 002d7fe000] #0 [0000000000 - 0000001000] BIOS data page ==> [0000000000 - 0000001000] #1 [0000100000 - 0000337834] TEXT DATA BSS ==> [0000100000 - 0000337834] #2 [0000601000 - 0000607000] INIT_PG_TABLE ==> [0000601000 - 0000607000] #3 [0000607000 - 000076d000] PGTABLE ==> [0000607000 - 000076d000] #4 [0000001000 - 0000007000] BOOTMAP ==> [0000001000 - 0000007000] Zone PFN ranges: DMA 0x00000000 -> 0x00001000 Normal 0x00001000 -> 0x0002d7fe HighMem 0x0002d7fe -> 0x000b1800 Movable zone start PFN for each node early_node_map[3] active PFN ranges 0: 0x00000000 -> 0x000000a0 0: 0x00000100 -> 0x00000338 0: 0x00000601 -> 0x000b1800 Xen: using vcpu_info placement Allocating PCI resources starting at b8000000 (gap: b1800000:4e800000) Built 1 zonelists in Zone order, mobility grouping on. Total pages: 720550 Kernel command line: root=/dev/xvda1 ro console=hvc 3 Enabling fast FPU save and restore... done. Enabling unmasked SIMD FPU exception support... done. Initializing CPU#0 PID hash table entries: 4096 (order: 12, 16384 bytes) Detected 2925.998 MHz processor. Console: colour dummy device 80x25 console [tty0] enabled console [hvc0] enabled Dentry cache hash table entries: 131072 (order: 7, 524288 bytes) Inode-cache hash table entries: 65536 (order: 6, 262144 bytes) Memory: 2876884k/2908160k available (1228k kernel code, 27284k reserved, 719k data, 160k init, 2162696k highmem) virtual kernel memory layout: fixmap : 0xf57eb000 - 0xf57fd000 ( 72 kB) pkmap : 0xf5200000 - 0xf5400000 (2048 kB) vmalloc : 0xee000000 - 0xf51fe000 ( 113 MB) lowmem : 0xc0000000 - 0xed7fe000 ( 727 MB) .init : 0xc02e8000 - 0xc0310000 ( 160 kB) .data : 0xc02332ef - 0xc02e6ef0 ( 719 kB) .text : 0xc0100000 - 0xc02332ef (1228 kB) Checking if this processor honours the WP bit even in supervisor mode...Ok. SLUB: Genslabs=12, HWalign=128, Order=0-3, MinObjects=0, CPUs=1, Nodes=1 installing Xen timer for CPU 0 Calibrating delay loop (skipped), value calculated using timer frequency.. 5851.99 BogoMIPS (lpj=29259980) Mount-cache hash table entries: 512 CPU: Trace cache: 12K uops, L1 D cache: 16K CPU: L2 cache: 256K CPU: Intel(R) Celeron(R) CPU 2.93GHz stepping 09 Freeing SMP alternatives: 0k freed net_namespace: 288 bytes Booting paravirtualized kernel on Xen Xen version: 3.2.1 Grant table initialized NET: Registered protocol family 16 PCI: Fatal: No config space access function found xen_balloon: Initialising balloon driver. SCSI subsystem initialized PCI: System does not support PCI PCI: System does not support PCI NET: Registered protocol family 2 IP route cache hash table entries: 32768 (order: 5, 131072 bytes) TCP established hash table entries: 131072 (order: 8, 1048576 bytes) TCP bind hash table entries: 65536 (order: 6, 262144 bytes) TCP: Hash tables configured (established 131072 bind 65536) TCP reno registered NET: Registered protocol family 1 highmem bounce pool size: 64 pages msgmni has been set to 1455 io scheduler noop registered io scheduler anticipatory registered (default) blkfront: xvda1: barriers enabled Initialising Xen virtual ethernet driver. i8042.c: No controller found. mice: PS/2 mouse device common for all mice cpuidle: using governor ladder cpuidle: using governor menu TCP cubic registered NET: Registered protocol family 17 Using IPI Shortcut mode XENBUS: Device with no driver: device/console/0 kjournald starting. Commit interval 5 seconds EXT3-fs: mounted filesystem with ordered data mode. VFS: Mounted root (ext3 filesystem) readonly. Freeing unused kernel memory: 160k freed
INIT: version 2.86 booting

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