Re: mm/vmemmap: fix wrong use of virt_to_page

On Tue, Nov 27, 2012 at 10:17:13AM +0800, Jianguo Wu wrote:

I enable CONFIG_DEBUG_VIRTUAL and CONFIG_SPARSEMEM_VMEMMAP, when doing memory hotremove,
there is a kernel BUG at arch/x86/mm/physaddr.c:20.

It is caused by free_section_usemap()->virt_to_page(),
virt_to_page() is only used for kernel direct mapping address,
but sparse-vmemmap uses vmemmap address, so it is going wrong here.

[  517.727381] ------------[ cut here ]------------
[  517.728851] kernel BUG at arch/x86/mm/physaddr.c:20!
[  517.728851] invalid opcode: 0000 [#1] SMP
[  517.740170] Modules linked in: acpihp_drv acpihp_slot edd cpufreq_conservativ
e cpufreq_userspace cpufreq_powersave acpi_cpufreq mperf fuse vfat fat loop dm_m
od coretemp kvm crc32c_intel ipv6 ixgbe igb iTCO_wdt i7core_edac edac_core pcspk
r iTCO_vendor_support ioatdma microcode joydev sr_mod i2c_i801 dca lpc_ich mfd_c
ore mdio tpm_tis i2c_core hid_generic tpm cdrom sg tpm_bios rtc_cmos button ext3
 jbd mbcache usbhid hid uhci_hcd ehci_hcd usbcore usb_common sd_mod crc_t10dif p
rocessor thermal_sys hwmon scsi_dh_alua scsi_dh_hp_sw scsi_dh_rdac scsi_dh_emc s
csi_dh ata_generic ata_piix libata megaraid_sas scsi_mod
[  517.740170] CPU 39
[  517.740170] Pid: 6454, comm: sh Not tainted 3.7.0-rc1-acpihp-final+ #45 QCI Q
SSC-S4R/QSSC-S4R
[  517.740170] RIP: 0010:[<ffffffff8103c908>]  [<ffffffff8103c908>] __phys_addr+
0x88/0x90
[  517.740170] RSP: 0018:ffff8804440d7c08  EFLAGS: 00010006
[  517.740170] RAX: 0000000000000006 RBX: ffffea0012000000 RCX: 000000000000002c

[  517.740170] RDX: 0000620012000000 RSI: 0000000000000000 RDI: ffffea0012000000

[  517.740170] RBP: ffff8804440d7c08 R08: 0070000000000400 R09: 0000000000488000

[  517.740170] R10: 0000000000000091 R11: 0000000000000001 R12: ffff88047fb87800

[  517.740170] R13: ffffea0000000000 R14: ffff88047ffb3440 R15: 0000000000480000

[  517.740170] FS:  00007f0462b49700(0000) GS:ffff8804570c0000(0000) knlGS:00000
00000000000
[  517.740170] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[  517.740170] CR2: 00007f006dc5fd14 CR3: 0000000440e85000 CR4: 00000000000007e0

[  517.740170] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000

[  517.896799] DR3: 0000000000000000 DR6

Signed-off-by: Jianguo Wu <redacted>
Signed-off-by: Jiang Liu <redacted>

Acked-by: Johannes Weiner <hannes@cmpxchg.org>

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