1. 17 Nov, 2014 2 commits
    • Catalin Marinas's avatar
      arm64: Add COMPAT_HWCAP_LPAE · 7d57511d
      Catalin Marinas authored
      Commit a469abd0
      
       (ARM: elf: add new hwcap for identifying atomic
      ldrd/strd instructions) introduces HWCAP_ELF for 32-bit ARM
      applications. As LPAE is always present on arm64, report the
      corresponding compat HWCAP to user space.
      Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
      Cc: <stable@vger.kernel.org> # 3.11+
      Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
      7d57511d
    • Will Deacon's avatar
      mmu_gather: move minimal range calculations into generic code · fb7332a9
      Will Deacon authored
      
      
      On architectures with hardware broadcasting of TLB invalidation messages
      , it makes sense to reduce the range of the mmu_gather structure when
      unmapping page ranges based on the dirty address information passed to
      tlb_remove_tlb_entry.
      
      arm64 already does this by directly manipulating the start/end fields
      of the gather structure, but this confuses the generic code which
      does not expect these fields to change and can end up calculating
      invalid, negative ranges when forcing a flush in zap_pte_range.
      
      This patch moves the minimal range calculation out of the arm64 code
      and into the generic implementation, simplifying zap_pte_range in the
      process (which no longer needs to care about start/end, since they will
      point to the appropriate ranges already). With the range being tracked
      by core code, the need_flush flag is dropped in favour of checking that
      the end of the range has actually been set.
      
      Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Russell King - ARM Linux <linux@arm.linux.org.uk>
      Cc: Michal Simek <monstr@monstr.eu>
      Acked-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
      fb7332a9
  2. 14 Nov, 2014 3 commits
    • Will Deacon's avatar
      arm64: entry: use ldp/stp instead of push/pop when saving/restoring regs · 63648dd2
      Will Deacon authored
      
      
      The push/pop instructions can be suboptimal when saving/restoring large
      amounts of data to/from the stack, for example on entry/exit from the
      kernel. This is because:
      
        (1) They act on descending addresses (i.e. the newly decremented sp),
            which may defeat some hardware prefetchers
      
        (2) They introduce an implicit dependency between each instruction, as
            the sp has to be updated in order to resolve the address of the
            next access.
      
      This patch removes the push/pop instructions from our kernel entry/exit
      macros in favour of ldp/stp plus offset.
      Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
      63648dd2
    • Will Deacon's avatar
      arm64: entry: avoid writing lr explicitly for constructing return paths · d54e81f9
      Will Deacon authored
      
      
      Using an explicit adr instruction to set the link register to point at
      ret_fast_syscall/ret_to_user can defeat branch and return stack predictors.
      
      Instead, use the standard calling instructions (bl, blr) and have an
      unconditional branch as the following instruction.
      Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
      d54e81f9
    • Mark Rutland's avatar
      arm64: Fix up /proc/cpuinfo · 44b82b77
      Mark Rutland authored
      Commit d7a49086 (arm64: cpuinfo: print info for all CPUs)
      attempted to clean up /proc/cpuinfo, but due to concerns regarding
      further changes was reverted in commit 5e39977e
      
       (Revert "arm64:
      cpuinfo: print info for all CPUs").
      
      There are two major issues with the arm64 /proc/cpuinfo format
      currently:
      
      * The "Features" line describes (only) the 64-bit hwcaps, which is
        problematic for some 32-bit applications which attempt to parse it. As
        the same names are used for analogous ISA features (e.g. aes) despite
        these generally being architecturally unrelated, it is not possible to
        simply append the 64-bit and 32-bit hwcaps in a manner that might not
        be misleading to some applications.
      
        Various potential solutions have appeared in vendor kernels. Typically
        the format of the Features line varies depending on whether the task
        is 32-bit.
      
      * Information is only printed regarding a single CPU. This does not
        match the ARM format, and does not provide sufficient information in
        big.LITTLE systems where CPUs are heterogeneous. The CPU information
        printed is queried from the current CPU's registers, which is racy
        w.r.t. cross-cpu migration.
      
      This patch attempts to solve these issues. The following changes are
      made:
      
      * When a task with a LINUX32 personality attempts to read /proc/cpuinfo,
        the "Features" line contains the decoded 32-bit hwcaps, as with the
        arm port. Otherwise, the decoded 64-bit hwcaps are shown. This aligns
        with the behaviour of COMPAT_UTS_MACHINE and COMPAT_ELF_PLATFORM. In
        the absense of compat support, the Features line is empty.
      
        The set of hwcaps injected into a task's auxval are unaffected.
      
      * Properties are printed per-cpu, as with the ARM port. The per-cpu
        information is queried from pre-recorded cpu information (as used by
        the sanity checks).
      
      * As with the previous attempt at fixing up /proc/cpuinfo, the hardware
        field is removed. The only users so far are 32-bit applications tied
        to particular boards, so no portable applications should be affected,
        and this should prevent future tying to particular boards.
      
      The following differences remain:
      
      * No model_name is printed, as this cannot be queried from the hardware
        and cannot be provided in a stable fashion. Use of the CPU
        {implementor,variant,part,revision} fields is sufficient to identify a
        CPU and is portable across arm and arm64.
      
      * The following system-wide properties are not provided, as they are not
        possible to provide generally. Programs relying on these are already
        tied to particular (32-bit only) boards:
        - Hardware
        - Revision
        - Serial
      
      No software has yet been identified for which these remaining
      differences are problematic.
      
      Cc: Greg Hackmann <ghackmann@google.com>
      Cc: Ian Campbell <ijc@hellion.org.uk>
      Cc: Serban Constantinescu <serban.constantinescu@arm.com>
      Cc: Will Deacon <will.deacon@arm.com>
      Cc: cross-distro@lists.linaro.org
      Cc: linux-api@vger.kernel.org
      Cc: linux-arm-kernel@lists.infradead.org
      Cc: linux-kernel@vger.kernel.org
      Acked-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
      Signed-off-by: default avatarMark Rutland <mark.rutland@arm.com>
      Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
      44b82b77
  3. 07 Nov, 2014 2 commits
  4. 06 Nov, 2014 7 commits
  5. 05 Nov, 2014 11 commits
  6. 26 Oct, 2014 3 commits
    • Linus Torvalds's avatar
      Linux 3.18-rc2 · cac7f242
      Linus Torvalds authored
      cac7f242
    • Linus Torvalds's avatar
      Merge tag 'armsoc-for-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc · 88e23761
      Linus Torvalds authored
      Pull ARM SoC fixes from Olof Johansson:
       "Another week, another small batch of fixes.
      
        Most of these make zynq, socfpga and sunxi platforms work a bit
        better:
      
         - due to new requirements for regulators, DWMMC on socfpga broke past
           v3.17
         - SMP spinup fix for socfpga
         - a few DT fixes for zynq
         - another option (FIXED_REGULATOR) for sunxi is needed that used to
           be selected by other options but no longer is.
         - a couple of small DT fixes for at91
         - ...and a couple for i.MX"
      
      * tag 'armsoc-for-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc:
        ARM: dts: imx28-evk: Let i2c0 run at 100kHz
        ARM: i.MX6: Fix "emi" clock name typo
        ARM: multi_v7_defconfig: enable CONFIG_MMC_DW_ROCKCHIP
        ARM: sunxi_defconfig: enable CONFIG_REGULATOR_FIXED_VOLTAGE
        ARM: dts: socfpga: Add a 3.3V fixed regulator node
        ARM: dts: socfpga: Fix SD card detect
        ARM: dts: socfpga: rename gpio nodes
        ARM: at91/dt: sam9263: fix PLLB frequencies
        power: reset: at91-reset: fix power down register
        MAINTAINERS: add atmel ssc driver maintainer entry
        arm: socfpga: fix fetching cpu1start_addr for SMP
        ARM: zynq: DT: trivial: Fix mc node
        ARM: zynq: DT: Add cadence watchdog node
        ARM: zynq: DT: Add missing reference for memory-controller
        ARM: zynq: DT: Add missing reference for ADC
        ARM: zynq: DT: Add missing address for L2 pl310
        ARM: zynq: DT: Remove 222 MHz OPP
        ARM: zynq: DT: Fix GEM register area size
      88e23761
    • Linus Torvalds's avatar
      Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs · d1e14f1d
      Linus Torvalds authored
      Pull vfs updates from Al Viro:
       "overlayfs merge + leak fix for d_splice_alias() failure exits"
      
      * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
        overlayfs: embed middle into overlay_readdir_data
        overlayfs: embed root into overlay_readdir_data
        overlayfs: make ovl_cache_entry->name an array instead of pointer
        overlayfs: don't hold ->i_mutex over opening the real directory
        fix inode leaks on d_splice_alias() failure exits
        fs: limit filesystem stacking depth
        overlay: overlay filesystem documentation
        overlayfs: implement show_options
        overlayfs: add statfs support
        overlay filesystem
        shmem: support RENAME_WHITEOUT
        ext4: support RENAME_WHITEOUT
        vfs: add RENAME_WHITEOUT
        vfs: add whiteout support
        vfs: export check_sticky()
        vfs: introduce clone_private_mount()
        vfs: export __inode_permission() to modules
        vfs: export do_splice_direct() to modules
        vfs: add i_op->dentry_open()
      d1e14f1d
  7. 25 Oct, 2014 3 commits
  8. 24 Oct, 2014 9 commits
    • Al Viro's avatar
      overlayfs: embed middle into overlay_readdir_data · db6ec212
      Al Viro authored
      
      
      same story...
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      db6ec212
    • Al Viro's avatar
      overlayfs: embed root into overlay_readdir_data · 49be4fb9
      Al Viro authored
      
      
      no sense having it a pointer - all instances have it pointing to
      local variable in the same stack frame
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      49be4fb9
    • Al Viro's avatar
    • Al Viro's avatar
      overlayfs: don't hold ->i_mutex over opening the real directory · 3d268c9b
      Al Viro authored
      
      
      just use it to serialize the assignment
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      3d268c9b
    • Linus Torvalds's avatar
      Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus · 2cc91884
      Linus Torvalds authored
      Pull MIPS fixes from Ralf Baechle:
       "This is the first round of fixes and tying up loose ends for MIPS.
      
         - plenty of fixes for build errors in specific obscure configurations
         - remove redundant code on the Lantiq platform
         - removal of a useless SEAD I2C driver that was causing a build issue
         - fix an earlier TLB exeption handler fix to also work on Octeon.
         - fix ISA level dependencies in FPU emulator's instruction decoding.
         - don't hardcode kernel command line in Octeon software emulator.
         - fix an earlier fix for the Loondson 2 clock setting"
      
      * 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus:
        MIPS: SEAD3: Fix I2C device registration.
        MIPS: SEAD3: Nuke PIC32 I2C driver.
        MIPS: ftrace: Fix a microMIPS build problem
        MIPS: MSP71xx: Fix build error
        MIPS: Malta: Do not build the malta-amon.c file if CMP is not enabled
        MIPS: Prevent compiler warning from cop2_{save,restore}
        MIPS: Kconfig: Add missing MIPS_CPS dependencies to PM and cpuidle
        MIPS: idle: Remove leftover __pastwait symbol and its references
        MIPS: Sibyte: Include the swarm subdir to the sb1250 LittleSur builds
        MIPS: ptrace.h: Add a missing include
        MIPS: ath79: Fix compilation error when CONFIG_PCI is disabled
        MIPS: MSP71xx: Remove compilation error when CONFIG_MIPS_MT is present
        MIPS: Octeon: Remove special case for simulator command line.
        MIPS: tlbex: Properly fix HUGE TLB Refill exception handler
        MIPS: loongson2_cpufreq: Fix CPU clock rate setting mismerge
        pci: pci-lantiq: remove duplicate check on resource
        MIPS: Lasat: Add missing CONFIG_PROC_FS dependency to PICVUE_PROC
        MIPS: cp1emu: Fix ISA restrictions for cop1x_op instructions
      2cc91884
    • Linus Torvalds's avatar
      Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux · cdc63a05
      Linus Torvalds authored
      Pull arm64 fixes from Catalin Marinas:
      
       - enable 48-bit VA space now that KVM has been fixed, together with a
         couple of fixes for pgd allocation alignment and initial memblock
         current_limit.  There is still a dependency on !ARM_SMMU which needs
         to be updated as it uses the page table manipulation macros of the
         host kernel
       - eBPF fixes following changes/conflicts during the merging window
       - Compat types affecting compat_elf_prpsinfo
       - Compilation error on UP builds
       - ASLR fix when /proc/sys/kernel/randomize_va_space == 0
       - DT definitions for CLCD support on ARMv8 model platform
      
      * tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
        arm64: Fix memblock current_limit with 64K pages and 48-bit VA
        arm64: ASLR: Don't randomise text when randomise_va_space == 0
        arm64: vexpress: Add CLCD support to the ARMv8 model platform
        arm64: Fix compilation error on UP builds
        Documentation/arm64/memory.txt: fix typo
        net: bpf: arm64: minor fix of type in jited
        arm64: bpf: add 'load 64-bit immediate' instruction
        arm64: bpf: add 'shift by register' instructions
        net: bpf: arm64: address randomize and write protect JIT code
        arm64: mm: Correct fixmap pagetable types
        arm64: compat: fix compat types affecting struct compat_elf_prpsinfo
        arm64: Align less than PAGE_SIZE pgds naturally
        arm64: Allow 48-bits VA space without ARM_SMMU
      cdc63a05
    • Linus Torvalds's avatar
      Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc · 83da00fb
      Linus Torvalds authored
      Pull two sparc fixes from David Miller:
      
       1) Fix boots with gcc-4.9 compiled sparc64 kernels.
      
       2) Add missing __get_user_pages_fast() on sparc64 to fix hangs on
          futexes used in transparent hugepage areas.
      
          It's really idiotic to have a weak symbolled fallback that just
          returns zero, and causes this kind of bug.  There should be no
          backup implementation and the link should fail if the architecture
          fails to provide __get_user_pages_fast() and supports transparent
          hugepages.
      
      * git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc:
        sparc64: Implement __get_user_pages_fast().
        sparc64: Fix register corruption in top-most kernel stack frame during boot.
      83da00fb
    • Linus Torvalds's avatar
      Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm · 96971e9a
      Linus Torvalds authored
      Pull kvm fixes from Paolo Bonzini:
       "This is a pretty large update.  I think it is roughly as big as what I
        usually had for the _whole_ rc period.
      
        There are a few bad bugs where the guest can OOPS or crash the host.
        We have also started looking at attack models for nested
        virtualization; bugs that usually result in the guest ring 0 crashing
        itself become more worrisome if you have nested virtualization,
        because the nested guest might bring down the non-nested guest as
        well.  For current uses of nested virtualization these do not really
        have a security impact, but you never know and bugs are bugs
        nevertheless.
      
        A lot of these bugs are in 3.17 too, resulting in a large number of
        stable@ Ccs.  I checked that all the patches apply there with no
        conflicts"
      
      * tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
        kvm: vfio: fix unregister kvm_device_ops of vfio
        KVM: x86: Wrong assertion on paging_tmpl.h
        kvm: fix excessive pages un-pinning in kvm_iommu_map error path.
        KVM: x86: PREFETCH and HINT_NOP should have SrcMem flag
        KVM: x86: Emulator does not decode clflush well
        KVM: emulate: avoid accessing NULL ctxt->memopp
        KVM: x86: Decoding guest instructions which cross page boundary may fail
        kvm: x86: don't kill guest on unknown exit reason
        kvm: vmx: handle invvpid vm exit gracefully
        KVM: x86: Handle errors when RIP is set during far jumps
        KVM: x86: Emulator fixes for eip canonical checks on near branches
        KVM: x86: Fix wrong masking on relative jump/call
        KVM: x86: Improve thread safety in pit
        KVM: x86: Prevent host from panicking on shared MSR writes.
        KVM: x86: Check non-canonical addresses upon WRMSR
      96971e9a
    • Linus Torvalds's avatar
      Merge tag 'stable/for-linus-3.18-b-rc1-tag' of... · 20ca57cd
      Linus Torvalds authored
      Merge tag 'stable/for-linus-3.18-b-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip
      
      Pull xen bug fixes from David Vrabel:
      
       - Fix regression in xen_clocksource_read() which caused all Xen guests
         to crash early in boot.
       - Several fixes for super rare race conditions in the p2m.
       - Assorted other minor fixes.
      
      * tag 'stable/for-linus-3.18-b-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
        xen/pci: Allocate memory for physdev_pci_device_add's optarr
        x86/xen: panic on bad Xen-provided memory map
        x86/xen: Fix incorrect per_cpu accessor in xen_clocksource_read()
        x86/xen: avoid race in p2m handling
        x86/xen: delay construction of mfn_list_list
        x86/xen: avoid writing to freed memory after race in p2m handling
        xen/balloon: Don't continue ballooning when BP_ECANCELED is encountered
      20ca57cd