• Jianguo Wu's avatar
    mm/vmemmap: fix wrong use of virt_to_page · ae64ffca
    Jianguo Wu authored
    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.
    
      ------------[ cut here ]------------
      kernel BUG at arch/x86/mm/physaddr.c:20!
      invalid opcode: 0000 [#1] SMP
      Modules linked in: acpihp_drv acpihp_slot edd cpufreq_conservative cpufreq_userspace cpufreq_powersave acpi_cpufreq mperf fuse vfat fat loop dm_mod coretemp kvm crc32c_intel ipv6 ixgbe igb iTCO_wdt i7core_edac edac_core pcspkr iTCO_vendor_support ioatdma microcode joydev sr_mod i2c_i801 dca lpc_ich mfd_core 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 processor thermal_sys hwmon scsi_dh_alua scsi_dh_hp_sw scsi_dh_rdac scsi_dh_emc scsi_dh ata_generic ata_piix libata megaraid_sas scsi_mod
      CPU 39
      Pid: 6454, comm: sh Not tainted 3.7.0-rc1-acpihp-final+ #45 QCI QSSC-S4R/QSSC-S4R
      RIP: 0010:[<ffffffff8103c908>]  [<ffffffff8103c908>] __phys_addr+0x88/0x90
      RSP: 0018:ffff8804440d7c08  EFLAGS: 00010006
      RAX: 0000000000000006 RBX: ffffea0012000000 RCX: 000000000000002c
      ...
    Signed-off-by: default avatarJianguo Wu <wujianguo@huawei.com>
    Signed-off-by: default avatarJiang Liu <jiang.liu@huawei.com>
    Reviewd-by: default avatarWen Congyang <wency@cn.fujitsu.com>
    Acked-by: default avatarJohannes Weiner <hannes@cmpxchg.org>
    Reviewed-by: default avatarYasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
    Reviewed-by: default avatarMichal Hocko <mhocko@suse.cz>
    Cc: <stable@vger.kernel.org>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    ae64ffca
sparse.c 20.3 KB