1. 18 Feb, 2014 17 commits
  2. 17 Feb, 2014 19 commits
    • Linus Torvalds's avatar
      Merge tag 'dma-buf-for-3.14' of git://git.kernel.org/pub/scm/linux/kernel/git/sumits/dma-buf · 60f76eab
      Linus Torvalds authored
      Pull dma-buf fix from Sumit Semwal:
       "Just some debugfs output updates.
      
        There's another patch related to dma-buf, but it'll get upstreamed via
        Greg KH's pull request"
      
      * tag 'dma-buf-for-3.14' of git://git.kernel.org/pub/scm/linux/kernel/git/sumits/dma-buf:
        dma-buf: update debugfs output
      60f76eab
    • Linus Torvalds's avatar
      Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/egtvedt/linux-avr32 · 2b250395
      Linus Torvalds authored
      Pull AVR32 fixes from Hans-Christian Egtvedt.
      
      * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/egtvedt/linux-avr32:
        avr32: add generic vga.h to Kbuild
        avr32: add generic ioremap_wc() definition in io.h
        avr32: Makefile: add '-D__linux__' flag for gcc-4.4.7 use
        avr32: fix missing module.h causing build failure in mimc200/fram.c
      2b250395
    • Linus Torvalds's avatar
      Merge branch 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc · f2a77abd
      Linus Torvalds authored
      Pull powerpc fixes from Ben Herrenschmidt:
       "Here are some more powerpc fixes for 3.14
      
        The main one is a nasty issue with the NUMA balancing support which
        requires a small generic change and the addition of a new accessor to
        set _PAGE_NUMA.  Both have been reviewed and acked by Mel and Rik.
      
        The changelog should have plenty of details but basically, without
        this fix, we get random user segfaults and/or corruptions due to
        missing TLB/hash flushes.  Aneesh series of 3 patches fixes it.
      
        We have some vDSO vs.  perf fixes from Anton, some small EEH fixes
        from Gavin, a ppc32 regression vs the stack overflow detector, and a
        fix for the way we handle PCIe host bridge speed settings on pseries
        (which is needed for proper operations of AMD graphics cards on
        Power8)"
      
      * 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc:
        powerpc/eeh: Disable EEH on reboot
        powerpc/eeh: Cleanup on eeh_subsystem_enabled
        powerpc/powernv: Rework EEH reset
        powerpc: Use unstripped VDSO image for more accurate profiling data
        powerpc: Link VDSOs at 0x0
        mm: Use ptep/pmdp_set_numa() for updating _PAGE_NUMA bit
        mm: Dirty accountable change only apply to non prot numa case
        powerpc/mm: Add new "set" flag argument to pte/pmd update function
        powerpc/pseries: Add Gen3 definitions for PCIE link speed
        powerpc/pseries: Fix regression on PCI link speed
        powerpc: Set the correct ksp_limit on ppc32 when switching to irq stack
      f2a77abd
    • Linus Torvalds's avatar
      printk: fix syslog() overflowing user buffer · e4178d80
      Linus Torvalds authored
      This is not a buffer overflow in the traditional sense: we don't
      overflow any *kernel* buffers, but we do mis-count the amount of data we
      copy back to user space for the SYSLOG_ACTION_READ_ALL case.
      
      In particular, if the user buffer is too small to hold everything, and
      *if* there is a continuation line at just the right place, we can end up
      giving the user more data than he asked for.
      
      The reason is that we first count up the number of bytes all the log
      records contains, then we walk the records again until we've skipped the
      records at the beginning that won't fit, and then we walk the rest of
      the records and copy them to the user space buffer.
      
      And in between that "skip the initial records that won't fit" and the
      "copy the records that *will* fit to user space", we reset the 'prev'
      variable that contained the record information for the last record not
      copied.  That meant that when we started copying to user space, we now
      had a different character count than what we had originally calculated
      in the first record walk-through.
      
      The fix is to simply not clear the 'prev' flags value (in both cases
      where we had the same logic: syslog_print_all and kmsg_dump_get_buffer:
      the latter is used for pstore-like dumping)
      Reported-and-tested-by: default avatarDebabrata Banerjee <dbanerje@akamai.com>
      Acked-by: default avatarKay Sievers <kay@vrfy.org>
      Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
      Cc: Jeff Mahoney <jeffm@suse.com>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      e4178d80
    • Chen Gang's avatar
      avr32: add generic vga.h to Kbuild · d7668f9d
      Chen Gang authored
      Need add generic "vga.h", or can not pass building for allmodconfig,
      the related error:
      
          CC [M]  drivers/gpu/drm/drm_irq.o
        In file included from include/linux/vgaarb.h:34,
                         from drivers/gpu/drm/drm_irq.c:42:
        include/video/vga.h:22:21: error: asm/vga.h: No such file or directory
      Signed-off-by: default avatarChen Gang <gang.chen.5i5j@gmail.com>
      Acked-by: default avatarHans-Christian Egtvedt <hegtvedt@cisco.com>
      d7668f9d
    • Chen Gang's avatar
      avr32: add generic ioremap_wc() definition in io.h · 1bbce4f3
      Chen Gang authored
      Need generic ioremap_wc(), or can not pass compiling with allmodconfig,
      the related error:
      
          CC [M]  drivers/gpu/drm/drm_bufs.o
        drivers/gpu/drm/drm_bufs.c: In function 'drm_addmap_core':
        drivers/gpu/drm/drm_bufs.c:217: error: implicit declaration of function 'ioremap_wc'
        drivers/gpu/drm/drm_bufs.c:218: warning: assignment makes pointer from integer without a cast
      Signed-off-by: default avatarChen Gang <gang.chen.5i5j@gmail.com>
      Acked-by: default avatarHans-Christian Egtvedt <hegtvedt@cisco.com>
      1bbce4f3
    • Chen Gang's avatar
      avr32: Makefile: add '-D__linux__' flag for gcc-4.4.7 use · 8d80390c
      Chen Gang authored
      For avr32 cross compiler, do not define '__linux__' internally, so it
      will cause issue with allmodconfig.
      
      The related error:
      
          CC [M]  fs/coda/psdev.o
        In file included from include/linux/coda.h:64,
                         from fs/coda/psdev.c:45:
        include/uapi/linux/coda.h:221: error: expected specifier-qualifier-list before 'u_quad_t'
      
      The related toolchain version (which only download, not re-compile):
      
        [root@gchen linux-next]# /upstream/toolchain/download/avr32-gnu-toolchain-linux_x86/bin/avr32-gcc -v
        Using built-in specs.
        Target: avr32
        Configured with: /data2/home/toolsbuild/jenkins-knuth/workspace/avr32-gnu-toolchain/src/gcc/configure --target=avr32 --host=i686-pc-linux-gnu --build=x86_64-pc-linux-gnu --prefix=/home/toolsbuild/jenkins-knuth/workspace/avr32-gnu-toolchain/avr32-gnu-toolchain-linux_x86 --enable-languages=c,c++ --disable-nls --disable-libssp --disable-libstdcxx-pch --with-dwarf2 --enable-version-specific-runtime-libs --disable-shared --enable-doc --with-mpfr-lib=/home/toolsbuild/jenkins-knuth/workspace/avr32-gnu-toolchain/avr32-gnu-toolchain-linux_x86/lib --with-mpfr-include=/home/toolsbuild/jenkins-knuth/workspace/avr32-gnu-toolchain/avr32-gnu-toolchain-linux_x86/include --with-gmp=/home/toolsbuild/jenkins-knuth/workspace/avr32-gnu-toolchain/avr32-gnu-toolchain-linux_x86 --with-mpc=/home/toolsbuild/jenkins-knuth/workspace/avr32-gnu-toolchain/avr32-gnu-toolchain-linux_x86 --enable-__cxa_atexit --disable-shared --with-newlib --with-pkgversion=AVR_32_bit_GNU_Toolchain_3.4.2_435 --with-bugurl=http://www
      .atmel.com/avr
        Thread model: single
        gcc version 4.4.7 (AVR_32_bit_GNU_Toolchain_3.4.2_435)
      Signed-off-by: default avatarChen Gang <gang.chen.5i5j@gmail.com>
      Acked-by: default avatarHans-Christian Egtvedt <hegtvedt@cisco.com>
      Cc: stable@vger.kernel.org
      8d80390c
    • Paul Gortmaker's avatar
      avr32: fix missing module.h causing build failure in mimc200/fram.c · 5745d6a4
      Paul Gortmaker authored
      Causing this:
      
      In file included from arch/avr32/boards/mimc200/fram.c:13:
      include/linux/miscdevice.h:51: error: field 'list' has incomplete type
      include/linux/miscdevice.h:55: error: expected specifier-qualifier-list before 'mode_t'
      arch/avr32/boards/mimc200/fram.c:42: error: 'THIS_MODULE' undeclared here (not in a function)
      Reported-by: default avatarFengguang Wu <fengguang.wu@intel.com>
      Cc: Haavard Skinnemoen <hskinnemoen@gmail.com>
      Cc: Hans-Christian Egtvedt <egtvedt@samfundet.no>
      Signed-off-by: default avatarPaul Gortmaker <paul.gortmaker@windriver.com>
      Signed-off-by: default avatarSergei Trofimovich <slyfox@gentoo.org>
      Acked-by: default avatarHans-Christian Egtvedt <egtvedt@samfundet.no>
      Cc: stable@vger.kernel.org
      5745d6a4
    • Gavin Shan's avatar
      powerpc/eeh: Disable EEH on reboot · 66f9af83
      Gavin Shan authored
      We possiblly detect EEH errors during reboot, particularly in kexec
      path, but it's impossible for device drivers and EEH core to handle
      or recover them properly.
      
      The patch registers one reboot notifier for EEH and disable EEH
      subsystem during reboot. That means the EEH errors is going to be
      cleared by hardware reset or second kernel during early stage of
      PCI probe.
      Signed-off-by: default avatarGavin Shan <shangw@linux.vnet.ibm.com>
      Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
      66f9af83
    • Gavin Shan's avatar
      powerpc/eeh: Cleanup on eeh_subsystem_enabled · 2ec5a0ad
      Gavin Shan authored
      The patch cleans up variable eeh_subsystem_enabled so that we needn't
      refer the variable directly from external. Instead, we will use
      function eeh_enabled() and eeh_set_enable() to operate the variable.
      Signed-off-by: default avatarGavin Shan <shangw@linux.vnet.ibm.com>
      Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
      2ec5a0ad
    • Gavin Shan's avatar
      powerpc/powernv: Rework EEH reset · 5b2e198e
      Gavin Shan authored
      When doing reset in order to recover the affected PE, we issue
      hot reset on PE primary bus if it's not root bus. Otherwise, we
      issue hot or fundamental reset on root port or PHB accordingly.
      For the later case, we didn't cover the situation where PE only
      includes root port and it potentially causes kernel crash upon
      EEH error to the PE.
      
      The patch reworks the logic of EEH reset to improve the code
      readability and also avoid the kernel crash.
      
      Cc: stable@vger.kernel.org
      Reported-by: default avatarThadeu Lima de Souza Cascardo <cascardo@linux.vnet.ibm.com>
      Signed-off-by: default avatarGavin Shan <shangw@linux.vnet.ibm.com>
      Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
      5b2e198e
    • Anton Blanchard's avatar
      powerpc: Use unstripped VDSO image for more accurate profiling data · 24b659a1
      Anton Blanchard authored
      We are seeing a lot of hits in the VDSO that are not resolved by perf.
      A while(1) gettimeofday() loop shows the issue:
      
      27.64%  [vdso]  [.] 0x000000000000060c
      22.57%  [vdso]  [.] 0x0000000000000628
      16.88%  [vdso]  [.] 0x0000000000000610
      12.39%  [vdso]  [.] __kernel_gettimeofday
       6.09%  [vdso]  [.] 0x00000000000005f8
       3.58%  test    [.] 00000037.plt_call.gettimeofday@@GLIBC_2.18
       2.94%  [vdso]  [.] __kernel_datapage_offset
       2.90%  test    [.] main
      
      We are using a stripped VDSO image which means only symbols with
      relocation info can be resolved. There isn't a lot of point to
      stripping the VDSO, the debug info is only about 1kB:
      
      4680 arch/powerpc/kernel/vdso64/vdso64.so
      5815 arch/powerpc/kernel/vdso64/vdso64.so.dbg
      
      By using the unstripped image, we can resolve all the symbols in the
      VDSO and the perf profile data looks much better:
      
      76.53%  [vdso]  [.] __do_get_tspec
      12.20%  [vdso]  [.] __kernel_gettimeofday
       5.05%  [vdso]  [.] __get_datapage
       3.20%  test    [.] main
       2.92%  test    [.] 00000037.plt_call.gettimeofday@@GLIBC_2.18
      Signed-off-by: default avatarAnton Blanchard <anton@samba.org>
      Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
      24b659a1
    • Anton Blanchard's avatar
      powerpc: Link VDSOs at 0x0 · a0a4419e
      Anton Blanchard authored
      perf is failing to resolve symbols in the VDSO. A while (1)
      gettimeofday() loop shows:
      
      93.99%  [vdso]  [.] 0x00000000000005e0
       3.12%  test    [.] 00000037.plt_call.gettimeofday@@GLIBC_2.18
       2.81%  test    [.] main
      
      The reason for this is that we are linking our VDSO shared libraries
      at 1MB, which is a little weird. Even though this is uncommon, Alan
      points out that it is valid and we should probably fix perf userspace.
      
      Regardless, I can't see a reason why we are doing this. The code
      is all position independent and we never rely on the VDSO ending
      up at 1M (and we never place it there on 64bit tasks).
      
      Changing our link address to 0x0 fixes perf VDSO symbol resolution:
      
      73.18%  [vdso]  [.] 0x000000000000060c
      12.39%  [vdso]  [.] __kernel_gettimeofday
       3.58%  test    [.] 00000037.plt_call.gettimeofday@@GLIBC_2.18
       2.94%  [vdso]  [.] __kernel_datapage_offset
       2.90%  test    [.] main
      
      We still have some local symbol resolution issues that will be
      fixed in a subsequent patch.
      Signed-off-by: default avatarAnton Blanchard <anton@samba.org>
      Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
      a0a4419e
    • Aneesh Kumar K.V's avatar
      mm: Use ptep/pmdp_set_numa() for updating _PAGE_NUMA bit · 56eecdb9
      Aneesh Kumar K.V authored
      Archs like ppc64 doesn't do tlb flush in set_pte/pmd functions when using
      a hash table MMU for various reasons (the flush is handled as part of
      the PTE modification when necessary).
      
      ppc64 thus doesn't implement flush_tlb_range for hash based MMUs.
      
      Additionally ppc64 require the tlb flushing to be batched within ptl locks.
      
      The reason to do that is to ensure that the hash page table is in sync with
      linux page table.
      
      We track the hpte index in linux pte and if we clear them without flushing
      hash and drop the ptl lock, we can have another cpu update the pte and can
      end up with duplicate entry in the hash table, which is fatal.
      
      We also want to keep set_pte_at simpler by not requiring them to do hash
      flush for performance reason. We do that by assuming that set_pte_at() is
      never *ever* called on a PTE that is already valid.
      
      This was the case until the NUMA code went in which broke that assumption.
      
      Fix that by introducing a new pair of helpers to set _PAGE_NUMA in a
      way similar to ptep/pmdp_set_wrprotect(), with a generic implementation
      using set_pte_at() and a powerpc specific one using the appropriate
      mechanism needed to keep the hash table in sync.
      Acked-by: default avatarMel Gorman <mgorman@suse.de>
      Reviewed-by: default avatarRik van Riel <riel@redhat.com>
      Signed-off-by: default avatarAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
      Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
      56eecdb9
    • Aneesh Kumar K.V's avatar
    • Aneesh Kumar K.V's avatar
      powerpc/mm: Add new "set" flag argument to pte/pmd update function · 88247e8d
      Aneesh Kumar K.V authored
      pte_update() is a powerpc-ism used to change the bits of a PTE
      when the access permission is being restricted (a flush is
      potentially needed).
      
      It uses atomic operations on when needed and handles the hash
      synchronization on hash based processors.
      
      It is currently only used to clear PTE bits and so the current
      implementation doesn't provide a way to also set PTE bits.
      
      The new _PAGE_NUMA bit, when set, is actually restricting access
      so it must use that function too, so this change adds the ability
      for pte_update() to also set bits.
      
      We will use this later to set the _PAGE_NUMA bit.
      Acked-by: default avatarMel Gorman <mgorman@suse.de>
      Acked-by: default avatarRik van Riel <riel@redhat.com>
      Signed-off-by: default avatarAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
      Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
      88247e8d
    • Kleber Sacilotto de Souza's avatar
      powerpc/pseries: Add Gen3 definitions for PCIE link speed · 49d9684a
      Kleber Sacilotto de Souza authored
      Rev3 of the PCI Express Base Specification defines a Supported Link
      Speeds Vector where the bit definitions within this field are:
      
      Bit 0 - 2.5 GT/s
      Bit 1 - 5.0 GT/s
      Bit 2 - 8.0 GT/s
      
      This vector definition is used by the platform firmware to export the
      maximum and current link speeds of the PCI bus via the
      "ibm,pcie-link-speed-stats" device-tree property.
      
      This patch updates pseries_root_bridge_prepare() to detect Gen3
      speed buses (defined by 0x04).
      Signed-off-by: default avatarKleber Sacilotto de Souza <klebers@linux.vnet.ibm.com>
      Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
      49d9684a
    • Kleber Sacilotto de Souza's avatar
      powerpc/pseries: Fix regression on PCI link speed · b020cc6c
      Kleber Sacilotto de Souza authored
      Commit 5091f0c9 (powerpc/pseries: Fix PCIE link speed endian issue)
      introduced a regression on the PCI link speed detection using the
      device-tree property. The ibm,pcie-link-speed-stats property is composed
      of two 32-bit integers, the first one being the maxinum link speed and
      the second the current link speed. The changes introduced by the
      aforementioned commit are considering just the first integer.
      
      Fix this issue by changing how the property is accessed, using the
      helper functions to properly access the array of values. The explicit
      byte swapping is not needed anymore here, since it's done by the helper
      functions.
      Signed-off-by: default avatarKleber Sacilotto de Souza <klebers@linux.vnet.ibm.com>
      Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
      b020cc6c
    • Kevin Hao's avatar
      powerpc: Set the correct ksp_limit on ppc32 when switching to irq stack · 1a18a664
      Kevin Hao authored
      Guenter Roeck has got the following call trace on a p2020 board:
        Kernel stack overflow in process eb3e5a00, r1=eb79df90
        CPU: 0 PID: 2838 Comm: ssh Not tainted 3.13.0-rc8-juniper-00146-g19eca00 #4
        task: eb3e5a00 ti: c0616000 task.ti: ef440000
        NIP: c003a420 LR: c003a410 CTR: c0017518
        REGS: eb79dee0 TRAP: 0901   Not tainted (3.13.0-rc8-juniper-00146-g19eca00)
        MSR: 00029000 <CE,EE,ME>  CR: 24008444  XER: 00000000
        GPR00: c003a410 eb79df90 eb3e5a00 00000000 eb05d900 00000001 65d87646 00000000
        GPR08: 00000000 020b8000 00000000 00000000 44008442
        NIP [c003a420] __do_softirq+0x94/0x1ec
        LR [c003a410] __do_softirq+0x84/0x1ec
        Call Trace:
        [eb79df90] [c003a410] __do_softirq+0x84/0x1ec (unreliable)
        [eb79dfe0] [c003a970] irq_exit+0xbc/0xc8
        [eb79dff0] [c000cc1c] call_do_irq+0x24/0x3c
        [ef441f20] [c00046a8] do_IRQ+0x8c/0xf8
        [ef441f40] [c000e7f4] ret_from_except+0x0/0x18
        --- Exception: 501 at 0xfcda524
            LR = 0x10024900
        Instruction dump:
        7c781b78 3b40000a 3a73b040 543c0024 3a800000 3b3913a0 7ef5bb78 48201bf9
        5463103a 7d3b182e 7e89b92e 7c008146 <3ba00000> 7e7e9b78 48000014 57fff87f
        Kernel panic - not syncing: kernel stack overflow
        CPU: 0 PID: 2838 Comm: ssh Not tainted 3.13.0-rc8-juniper-00146-g19eca00 #4
        Call Trace:
      
      The reason is that we have used the wrong register to calculate the
      ksp_limit in commit cbc9565e (powerpc: Remove ksp_limit on ppc64).
      Just fix it.
      
      As suggested by Benjamin Herrenschmidt, also add the C prototype of the
      function in the comment in order to avoid such kind of errors in the
      future.
      
      Cc: stable@vger.kernel.org # 3.12
      Reported-by: default avatarGuenter Roeck <linux@roeck-us.net>
      Tested-by: default avatarGuenter Roeck <linux@roeck-us.net>
      Signed-off-by: default avatarKevin Hao <haokexin@gmail.com>
      Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
      1a18a664
  3. 16 Feb, 2014 4 commits
    • Linus Torvalds's avatar
      Linux 3.14-rc3 · 6d0abeca
      Linus Torvalds authored
      6d0abeca
    • Linus Torvalds's avatar
      Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs · 3962dfbe
      Linus Torvalds authored
      Pull btrfs fixes from Chris Mason:
       "We have a small collection of fixes in my for-linus branch.
      
        The big thing that stands out is a revert of a new ioctl.  Users
        haven't shipped yet in btrfs-progs, and Dave Sterba found a better way
        to export the information"
      
      * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs:
        Btrfs: use right clone root offset for compressed extents
        btrfs: fix null pointer deference at btrfs_sysfs_add_one+0x105
        Btrfs: unset DCACHE_DISCONNECTED when mounting default subvol
        Btrfs: fix max_inline mount option
        Btrfs: fix a lockdep warning when cleaning up aborted transaction
        Revert "btrfs: add ioctl to export size of global metadata reservation"
      3962dfbe
    • Linus Torvalds's avatar
      Merge tag 'dt-fixes-for-3.14' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux · 4302a875
      Linus Torvalds authored
      Pull devicetree fixes from Rob Herring:
       "Fix booting on PPC boards.  Changes to of_match_node matching caused
        the serial port on some PPC boards to stop working.  Reverted the
        change and reimplement to split matching between new style compatible
        only matching and fallback to old matching algorithm"
      
      * tag 'dt-fixes-for-3.14' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux:
        of: search the best compatible match first in __of_match_node()
        Revert "OF: base: match each node compatible against all given matches first"
      4302a875
    • Kevin Hao's avatar
      of: search the best compatible match first in __of_match_node() · 06b29e76
      Kevin Hao authored
      Currently, of_match_node compares each given match against all node's
      compatible strings with of_device_is_compatible.
      
      To achieve multiple compatible strings per node with ordering from
      specific to generic, this requires given matches to be ordered from
      specific to generic. For most of the drivers this is not true and also
      an alphabetical ordering is more sane there.
      
      Therefore, this patch introduces a function to match each of the node's
      compatible strings against all given compatible matches without type and
      name first, before checking the next compatible string. This implies
      that node's compatibles are ordered from specific to generic while
      given matches can be in any order. If we fail to find such a match
      entry, then fall-back to the old method in order to keep compatibility.
      
      Cc: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
      Signed-off-by: default avatarKevin Hao <haokexin@gmail.com>
      Tested-by: default avatarStephen Chivers <schivers@csc.com>
      Signed-off-by: default avatarRob Herring <robh@kernel.org>
      06b29e76