1. 22 Mar, 2013 3 commits
  2. 21 Mar, 2013 2 commits
  3. 10 Mar, 2013 13 commits
  4. 26 Feb, 2013 1 commit
  5. 25 Feb, 2013 12 commits
    • Linus Torvalds's avatar
      Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 · 32dc43e4
      Linus Torvalds authored
      Pull crypto update from Herbert Xu:
       "Here is the crypto update for 3.9:
      
         - Added accelerated implementation of crc32 using pclmulqdq.
      
         - Added test vector for fcrypt.
      
         - Added support for OMAP4/AM33XX cipher and hash.
      
         - Fixed loose crypto_user input checks.
      
         - Misc fixes"
      
      * git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6: (43 commits)
        crypto: user - ensure user supplied strings are nul-terminated
        crypto: user - fix empty string test in report API
        crypto: user - fix info leaks in report API
        crypto: caam - Added property fsl,sec-era in SEC4.0 device tree binding.
        crypto: use ERR_CAST
        crypto: atmel-aes - adjust duplicate test
        crypto: crc32-pclmul - Kill warning on x86-32
        crypto: x86/twofish - assembler clean-ups: use ENTRY/ENDPROC, localize jump labels
        crypto: x86/sha1 - assembler clean-ups: use ENTRY/ENDPROC
        crypto: x86/serpent - use ENTRY/ENDPROC for assember functions and localize jump targets
        crypto: x86/salsa20 - assembler cleanup, use ENTRY/ENDPROC for assember functions and rename ECRYPT_* to salsa20_*
        crypto: x86/ghash - assembler clean-up: use ENDPROC at end of assember functions
        crypto: x86/crc32c - assembler clean-up: use ENTRY/ENDPROC
        crypto: cast6-avx: use ENTRY()/ENDPROC() for assembler functions
        crypto: cast5-avx: use ENTRY()/ENDPROC() for assembler functions and localize jump targets
        crypto: camellia-x86_64/aes-ni: use ENTRY()/ENDPROC() for assembler functions and localize jump targets
        crypto: blowfish-x86_64: use ENTRY()/ENDPROC() for assembler functions and localize jump targets
        crypto: aesni-intel - add ENDPROC statements for assembler functions
        crypto: x86/aes - assembler clean-ups: use ENTRY/ENDPROC, localize jump targets
        crypto: testmgr - add test vector for fcrypt
        ...
      32dc43e4
    • Linus Torvalds's avatar
      Merge tag 'please-pull-vm_unwrapped' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux · d414c104
      Linus Torvalds authored
      Pull ia64 update from Tony Luck:
       "ia64 vm patch series that was cooking in -mm tree"
      
      * tag 'please-pull-vm_unwrapped' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux:
        mm: use vm_unmapped_area() in hugetlbfs on ia64 architecture
        mm: use vm_unmapped_area() on ia64 architecture
      d414c104
    • Linus Torvalds's avatar
      Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security · f6d43b93
      Linus Torvalds authored
      Pull security subsystem fixes from James Morris:
       "From Mimi:
      
          Both of these patches are bug fixes for patches, which were
          upstreamed in this open window.  The first patch addresses a merge
          issue.  The second patch addresses a CONFIG_BLOCK dependency."
      
      * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security:
        block: fix part_pack_uuid() build error
        ima: "remove enforce checking duplication" merge fix
      f6d43b93
    • Linus Torvalds's avatar
      Merge tag 'ktest-v3.9' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-ktest · c69d0a15
      Linus Torvalds authored
      Pull ktest update from Steven Rostedt:
       "Added ability to have all builds test warnings.
      
        Fixed failing reboot when the reboot produces a non fatal error.
      
        Config reading fixes and other cleanups"
      
      * tag 'ktest-v3.9' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-ktest:
        ktest: Remove indexes from warnings check
        ktest: Ignore warnings during reboot
        ktest: Search for linux banner for successful reboot
        ktest: Add make_warnings_file and process full warnings
        ktest: Allow a test option to use its default option
        ktest: Strip off '\n' when reading which files were modified
        ktest: Do not require CONSOLE for build or install bisects
      c69d0a15
    • Linus Torvalds's avatar
      Merge tag 'modules-next-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux · 9043a265
      Linus Torvalds authored
      Pull module update from Rusty Russell:
       "The sweeping change is to make add_taint() explicitly indicate whether
        to disable lockdep, but it's a mechanical change."
      
      * tag 'modules-next-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux:
        MODSIGN: Add option to not sign modules during modules_install
        MODSIGN: Add -s <signature> option to sign-file
        MODSIGN: Specify the hash algorithm on sign-file command line
        MODSIGN: Simplify Makefile with a Kconfig helper
        module: clean up load_module a little more.
        modpost: Ignore ARC specific non-alloc sections
        module: constify within_module_*
        taint: add explicit flag to show whether lock dep is still OK.
        module: printk message when module signature fail taints kernel.
      9043a265
    • Mimi Zohar's avatar
      block: fix part_pack_uuid() build error · 446d64e3
      Mimi Zohar authored
      Commit "85865c1f
      
       ima: add policy support for file system uuid"
      introduced a CONFIG_BLOCK dependency.  This patch defines a
      wrapper called blk_part_pack_uuid(), which returns -EINVAL,
      when CONFIG_BLOCK is not defined.
      
      security/integrity/ima/ima_policy.c:538:4: error: implicit declaration
      of function 'part_pack_uuid' [-Werror=implicit-function-declaration]
      
      Changelog v2:
      - Reference commit number in patch description
      Changelog v1:
      - rename ima_part_pack_uuid() to blk_part_pack_uuid()
      - resolve scripts/checkpatch.pl warnings
      Changelog v0:
      - fix UUID scripts/Lindent msgs
      
      Reported-by: default avatarRandy Dunlap <rdunlap@infradead.org>
      Reported-by: default avatarDavid Rientjes <rientjes@google.com>
      Signed-off-by: default avatarMimi Zohar <zohar@linux.vnet.ibm.com>
      Acked-by: default avatarDavid Rientjes <rientjes@google.com>
      Acked-by: default avatarRandy Dunlap <rdunlap@infradead.org>
      Cc: Jens Axboe <axboe@kernel.dk>
      Signed-off-by: default avatarJames Morris <james.l.morris@oracle.com>
      446d64e3
    • Mimi Zohar's avatar
      ima: "remove enforce checking duplication" merge fix · a2c2c3a7
      Mimi Zohar authored
      Commit "750943a3
      
       ima: remove enforce checking duplication" combined
      the 'in IMA policy' and 'enforcing file integrity' checks.  For
      the non-file, kernel module verification, a specific check for
      'enforcing file integrity' was not added.  This patch adds the
      check.
      
      Signed-off-by: default avatarMimi Zohar <zohar@linux.vnet.ibm.com>
      Signed-off-by: default avatarJames Morris <james.l.morris@oracle.com>
      a2c2c3a7
    • Linus Torvalds's avatar
      Merge tag 'mfd-3.9-1' of git://git.kernel.org/pub/scm/linux/kernel/git/sameo/mfd-2.6 · ab782659
      Linus Torvalds authored
      Pull MFS updates from Samuel Ortiz:
       "This is the MFD pull request for the 3.9 merge window.
      
        No new drivers this time, but a bunch of fairly big cleanups:
      
         - Roger Quadros worked on a OMAP USBHS and TLL platform data
           consolidation, OMAP5 support and clock management code cleanup.
      
         - The first step of a major sync for the ab8500 driver from Lee
           Jones.  In particular, the debugfs and the sysct interfaces got
           extended and improved.
      
         - Peter Ujfalusi sent a nice patchset for cleaning and fixing the
           twl-core driver, with a much needed module id lookup code
           improvement.
      
         - The regular wm5102 and arizona cleanups and fixes from Mark Brown.
      
         - Laxman Dewangan extended the palmas APIs in order to implement the
           palmas GPIO and rt drivers.
      
         - Laxman also added DT support for the tps65090 driver.
      
         - The Intel SCH and ICH drivers got a couple fixes from Aaron Sierra
           and Darren Hart.
      
         - Linus Walleij patchset for the ab8500 driver allowed ab8500 and
           ab9540 based devices to switch to the new abx500 pin-ctrl driver.
      
         - The max8925 now has device tree and irqdomain support thanks to
           Qing Xu.
      
         - The recently added rtsx driver got a few cleanups and fixes for a
           better card detection code path and now also supports the RTS5227
           chipset, thanks to Wei Wang and Roger Tseng."
      
      * tag 'mfd-3.9-1' of git://git.kernel.org/pub/scm/linux/kernel/git/sameo/mfd-2.6: (109 commits)
        mfd: lpc_ich: Use devres API to allocate private data
        mfd: lpc_ich: Add Device IDs for Intel Wellsburg PCH
        mfd: lpc_sch: Accomodate partial population of the MFD devices
        mfd: da9052-i2c: Staticize da9052_i2c_fix()
        mfd: syscon: Fix sparse warning
        mfd: twl-core: Fix kernel panic on boot
        mfd: rtsx: Fix issue that booting OS with SD card inserted
        mfd: ab8500: Fix compile error
        mfd: Add missing GENERIC_HARDIRQS dependecies
        Documentation: Add docs for max8925 dt
        mfd: max8925: Add dts
        mfd: max8925: Support dt for backlight
        mfd: max8925: Fix onkey driver irq base
        mfd: max8925: Fix mfd device register failure
        mfd: max8925: Add irqdomain for dt
        mfd: vexpress: Allow vexpress-sysreg to self-initialise
        mfd: rtsx: Support RTS5227
        mfd: rtsx: Implement driving adjustment to device-dependent callbacks
        mfd: vexpress: Add pseudo-GPIO based LEDs
        mfd: ab8500: Rename ab8500 to abx500 for hwmon driver
        ...
      ab782659
    • Linus Torvalds's avatar
      Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media · 21fbd580
      Linus Torvalds authored
      Pull media updates from Mauro Carvalho Chehab:
      
       - Some cleanups at V4L2 documentation
      
       - new drivers: ts2020 frontend, ov9650 sensor, s5c73m3 sensor,
         sh-mobile veu mem2mem driver, radio-ma901, davinci_vpfe staging
         driver
      
       - Lots of missing MAINTAINERS entries added
      
       - several em28xx driver improvements, including its conversion to
         videobuf2
      
       - several fixups on drivers to make them to better comply with the API
      
       - DVB core: add support for DVBv5 stats, allowing the implementation of
         statistics for new standards like ISDB
      
       - mb86a20s: add statistics to the driver
      
       - lots of new board additions, cleanups, and driver improvements.
      
      * 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media: (596 commits)
        [media] media: Add 0x3009 USB PID to ttusb2 driver (fixed diff)
        [media] rtl28xxu: Add USB IDs for Compro VideoMate U620F
        [media] em28xx: add usb id for terratec h5 rev. 3
        [media] media: rc: gpio-ir-recv: add support for device tree parsing
        [media] mceusb: move check earlier to make smatch happy
        [media] radio-si470x doc: add info about v4l2-ctl and sox+alsa
        [media] staging: media: Remove unnecessary OOM messages
        [media] sh_vou: Use vou_dev instead of vou_file wherever possible
        [media] sh_vou: Use video_drvdata()
        [media] drivers/media/platform/soc_camera/pxa_camera.c: use devm_ functions
        [media] mt9t112: mt9t111 format set up differs from mt9t112
        [media] sh-mobile-ceu-camera: fix SHARPNESS control default
        Revert "[media] fc0011: Return early, if the frequency is already tuned"
        [media] cx18/ivtv: fix regression: remove __init from a non-init function
        [media] em28xx: fix analog streaming with USB bulk transfers
        [media] stv0900: remove unnecessary null pointer check
        [media] fc0011: Return early, if the frequency is already tuned
        [media] fc0011: Add some sanity checks and cleanups
        [media] fc0011: Fix xin value clamping
        Revert "[media] [PATH,1/2] mxl5007 move reset to attach"
        ...
      21fbd580
    • Linus Torvalds's avatar
      Merge tag 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jgarzik/libata-dev · d9978ec5
      Linus Torvalds authored
      Pull libata updates from Jeff Garzik:
      
      1) apply, and then revert, the sysfs export of ATA host controller
         number.  Discussion was continuing after patch application, trying to
         figure out how to best mesh exported data with the installers,
         boot-time agents and other parties that want this info.
      
      2) Merge Zero-Power Optical Device Driver (ZPODD) support, bringing the
         wonderfulness of sane power management to your CD/DVD device.
      
         Includes one SCSI-subsystem patch (with appropriate ACKs), adding
         runtime PM support to 'sr' driver.  That is the ZPODD interaction
         bits.
      
         Patchset went through some 13 revisions before it got here; kudos to
         Intel for persistence.
      
      3) pata_samsung_cf: use devm_clk_get()
      
      4) more ata_piix, ahci PCI IDs
      
      5) Add SATA driver for R-Car SoC
      
      6) Convert libata to use devm_ioremap_resource (Note: I think Greg sent
         this to you, also)
      
      7) Set proper Sense Key (SK) in the SCSI simulator when ATA passthrough
         indicates check condition.  Google and specification hawks everywhere
         shall rejoice.
      
      * tag 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jgarzik/libata-dev: (22 commits)
        [libata] fix smatch warning for zpodd_wake_dev
        [libata] Set proper SK when CK_COND is set.
        [libata] Convert to devm_ioremap_resource()
        libata: add R-Car SATA driver
        ahci: Add Device IDs for Intel Wellsburg PCH
        ata_piix: Add Device IDs for Intel Wellsburg PCH
        [SCSI] remove can_power_off flag from scsi_device
        [libata] scsi: no poll when ODD is powered off
        [SCSI] sr: support runtime pm
        ahci: AHCI-mode SATA patch for Intel Avoton DeviceIDs
        ata_piix: IDE-mode SATA patch for Intel Avoton DeviceIDs
        [libata] PM code cleanup for ata port
        [libata] pm: differentiate system and runtime pm for ata port
        Revert "libata: export host controller number thru /sys"
        libata: do not suspend port if normal ODD is attached
        libata: expose pm qos flags for ata device
        libata: handle power transition of ODD
        libata: check zero power ready status for ZPODD
        libata: move acpi notification code to zpodd
        libata: identify and init ZPODD devices
        ...
      d9978ec5
    • Nicolas Pitre's avatar
      tty vt: fix character insertion overflow · a883b70d
      Nicolas Pitre authored
      Commit 81732c3b ("tty vt: Fix line garbage in virtual console on
      command line edition") broke insert_char() in multiple ways.  Then
      commit b1a925f4
      
       ("tty vt: Fix a regression in command line edition")
      partially fixed it.  However, the buffer being moved is still too large
      and overflowing beyond the end of the current line, corrupting existing
      characters on the next line.
      
      Example test case:
      
      echo -e "abc\nde\x1b[A\x1b[4h \x1b[4l\x1b[B"
      
      Expected result:
      
      ab c
      de
      
      Current result:
      
      ab c
       e
      
      Needless to say that this is very annoying when inserting words in the
      middle of paragraphs with certain text editors.
      
      Signed-off-by: default avatarNicolas Pitre <nico@linaro.org>
      Cc: Jean-François Moine <moinejf@free.fr>
      Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
      Cc: <stable@vger.kernel.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      a883b70d
    • Linus Torvalds's avatar
      Merge tag 'stable/for-linus-3.9-rc0-tag' of... · 77be36de
      Linus Torvalds authored
      Merge tag 'stable/for-linus-3.9-rc0-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen
      
      Pull Xen update from Konrad Rzeszutek Wilk:
       "This has two new ACPI drivers for Xen - a physical CPU offline/online
        and a memory hotplug.  The way this works is that ACPI kicks the
        drivers and they make the appropiate hypercall to the hypervisor to
        tell it that there is a new CPU or memory.  There also some changes to
        the Xen ARM ABIs and couple of fixes.  One particularly nasty bug in
        the Xen PV spinlock code was fixed by Stefan Bader - and has been
        there since the 2.6.32!
      
        Features:
         - Xen ACPI memory and CPU hotplug drivers - allowing Xen hypervisor
           to be aware of new CPU and new DIMMs
         - Cleanups
        Bug-fixes:
         - Fixes a long-standing bug in the PV spinlock wherein we did not
           kick VCPUs that were in a tight loop.
         - Fixes in the error paths for the event channel machinery"
      
      Fix up a few semantic conflicts with the ACPI interface changes in
      drivers/xen/xen-acpi-{cpu,mem}hotplug.c.
      
      * tag 'stable/for-linus-3.9-rc0-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen:
        xen: event channel arrays are xen_ulong_t and not unsigned long
        xen: Send spinlock IPI to all waiters
        xen: introduce xen_remap, use it instead of ioremap
        xen: close evtchn port if binding to irq fails
        xen-evtchn: correct comment and error output
        xen/tmem: Add missing %s in the printk statement.
        xen/acpi: move xen_acpi_get_pxm under CONFIG_XEN_DOM0
        xen/acpi: ACPI cpu hotplug
        xen/acpi: Move xen_acpi_get_pxm to Xen's acpi.h
        xen/stub: driver for CPU hotplug
        xen/acpi: ACPI memory hotplug
        xen/stub: driver for memory hotplug
        xen: implement updated XENMEM_add_to_physmap_range ABI
        xen/smp: Move the common CPU init code a bit to prep for PVH patch.
      77be36de
  6. 24 Feb, 2013 9 commits
    • Linus Torvalds's avatar
      Merge tag 'kvm-3.9-1' of git://git.kernel.org/pub/scm/virt/kvm/kvm · 89f88337
      Linus Torvalds authored
      Pull KVM updates from Marcelo Tosatti:
       "KVM updates for the 3.9 merge window, including x86 real mode
        emulation fixes, stronger memory slot interface restrictions, mmu_lock
        spinlock hold time reduction, improved handling of large page faults
        on shadow, initial APICv HW acceleration support, s390 channel IO
        based virtio, amongst others"
      
      * tag 'kvm-3.9-1' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (143 commits)
        Revert "KVM: MMU: lazily drop large spte"
        x86: pvclock kvm: align allocation size to page size
        KVM: nVMX: Remove redundant get_vmcs12 from nested_vmx_exit_handled_msr
        x86 emulator: fix parity calculation for AAD instruction
        KVM: PPC: BookE: Handle alignment interrupts
        booke: Added DBCR4 SPR number
        KVM: PPC: booke: Allow multiple exception types
        KVM: PPC: booke: use vcpu reference from thread_struct
        KVM: Remove user_alloc from struct kvm_memory_slot
        KVM: VMX: disable apicv by default
        KVM: s390: Fix handling of iscs.
        KVM: MMU: cleanup __direct_map
        KVM: MMU: remove pt_access in mmu_set_spte
        KVM: MMU: cleanup mapping-level
        KVM: MMU: lazily drop large spte
        KVM: VMX: cleanup vmx_set_cr0().
        KVM: VMX: add missing exit names to VMX_EXIT_REASONS array
        KVM: VMX: disable SMEP feature when guest is in non-paging mode
        KVM: Remove duplicate text in api.txt
        Revert "KVM: MMU: split kvm_mmu_free_page"
        ...
      89f88337
    • Linus Torvalds's avatar
      Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal · 9e2d59ad
      Linus Torvalds authored
      Pull signal handling cleanups from Al Viro:
       "This is the first pile; another one will come a bit later and will
        contain SYSCALL_DEFINE-related patches.
      
         - a bunch of signal-related syscalls (both native and compat)
           unified.
      
         - a bunch of compat syscalls switched to COMPAT_SYSCALL_DEFINE
           (fixing several potential problems with missing argument
           validation, while we are at it)
      
         - a lot of now-pointless wrappers killed
      
         - a couple of architectures (cris and hexagon) forgot to save
           altstack settings into sigframe, even though they used the
           (uninitialized) values in sigreturn; fixed.
      
         - microblaze fixes for delivery of multiple signals arriving at once
      
         - saner set of helpers for signal delivery introduced, several
           architectures switched to using those."
      
      * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal: (143 commits)
        x86: convert to ksignal
        sparc: convert to ksignal
        arm: switch to struct ksignal * passing
        alpha: pass k_sigaction and siginfo_t using ksignal pointer
        burying unused conditionals
        make do_sigaltstack() static
        arm64: switch to generic old sigaction() (compat-only)
        arm64: switch to generic compat rt_sigaction()
        arm64: switch compat to generic old sigsuspend
        arm64: switch to generic compat rt_sigqueueinfo()
        arm64: switch to generic compat rt_sigpending()
        arm64: switch to generic compat rt_sigprocmask()
        arm64: switch to generic sigaltstack
        sparc: switch to generic old sigsuspend
        sparc: COMPAT_SYSCALL_DEFINE does all sign-extension as well as SYSCALL_DEFINE
        sparc: kill sign-extending wrappers for native syscalls
        kill sparc32_open()
        sparc: switch to use of generic old sigaction
        sparc: switch sys_compat_rt_sigaction() to COMPAT_SYSCALL_DEFINE
        mips: switch to generic sys_fork() and sys_clone()
        ...
      9e2d59ad
    • Linus Torvalds's avatar
      Merge branch 'akpm' (more incoming from Andrew) · 5ce1a70e
      Linus Torvalds authored
      Merge second patch-bomb from Andrew Morton:
      
       - A little DM fix
      
       - the MM queue
      
      * emailed patches from Andrew Morton <akpm@linux-foundation.org>: (154 commits)
        ksm: allocate roots when needed
        mm: cleanup "swapcache" in do_swap_page
        mm,ksm: swapoff might need to copy
        mm,ksm: FOLL_MIGRATION do migration_entry_wait
        ksm: shrink 32-bit rmap_item back to 32 bytes
        ksm: treat unstable nid like in stable tree
        ksm: add some comments
        tmpfs: fix mempolicy object leaks
        tmpfs: fix use-after-free of mempolicy object
        mm/fadvise.c: drain all pagevecs if POSIX_FADV_DONTNEED fails to discard all pages
        mm: export mmu notifier invalidates
        mm: accelerate mm_populate() treatment of THP pages
        mm: use long type for page counts in mm_populate() and get_user_pages()
        mm: accurately document nr_free_*_pages functions with code comments
        HWPOISON: change order of error_states[]'s elements
        HWPOISON: fix misjudgement of page_action() for errors on mlocked pages
        memcg: stop warning on memcg_propagate_kmem
        net: change type of virtio_chan->p9_max_pages
        vmscan: change type of vm_total_pages to unsigned long
        fs/nfsd: change type of max_delegations, nfsd_drc_max_mem and nfsd_drc_mem_used
        ...
      5ce1a70e
    • Hugh Dickins's avatar
      ksm: allocate roots when needed · ef53d16c
      Hugh Dickins authored
      
      
      It is a pity to have MAX_NUMNODES+MAX_NUMNODES tree roots statically
      allocated, particularly when very few users will ever actually tune
      merge_across_nodes 0 to use more than 1+1 of those trees.  Not a big
      deal (only 16kB wasted on each machine with CONFIG_MAXSMP), but a pity.
      
      Start off with 1+1 statically allocated, then if merge_across_nodes is
      ever tuned, allocate for nr_node_ids+nr_node_ids.  Do not attempt to
      free up the extra if it's tuned back, that would be a waste of effort.
      
      Signed-off-by: default avatarHugh Dickins <hughd@google.com>
      Cc: Mel Gorman <mgorman@suse.de>
      Cc: Petr Holasek <pholasek@redhat.com>
      Cc: Andrea Arcangeli <aarcange@redhat.com>
      Cc: Izik Eidus <izik.eidus@ravellosystems.com>
      Cc: Johannes Weiner <hannes@cmpxchg.org>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      ef53d16c
    • Hugh Dickins's avatar
      mm: cleanup "swapcache" in do_swap_page · 56f31801
      Hugh Dickins authored
      
      
      I dislike the way in which "swapcache" gets used in do_swap_page():
      there is always a page from swapcache there (even if maybe uncached by
      the time we lock it), but tests are made according to "swapcache".
      Rework that with "page != swapcache", as has been done in unuse_pte().
      
      Signed-off-by: default avatarHugh Dickins <hughd@google.com>
      Cc: Mel Gorman <mgorman@suse.de>
      Cc: Petr Holasek <pholasek@redhat.com>
      Cc: Andrea Arcangeli <aarcange@redhat.com>
      Cc: Izik Eidus <izik.eidus@ravellosystems.com>
      Cc: Johannes Weiner <hannes@cmpxchg.org>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      56f31801
    • Hugh Dickins's avatar
      mm,ksm: swapoff might need to copy · 9e16b7fb
      Hugh Dickins authored
      
      
      Before establishing that KSM page migration was the cause of my
      WARN_ON_ONCE(page_mapped(page))s, I suspected that they came from the
      lack of a ksm_might_need_to_copy() in swapoff's unuse_pte() - which in
      many respects is equivalent to faulting in a page.
      
      In fact I've never caught that as the cause: but in theory it does at
      least need the KSM_RUN_UNMERGE check in ksm_might_need_to_copy(), to
      avoid bringing a KSM page back in when it's not supposed to be.
      
      I intended to copy how it's done in do_swap_page(), but have a strong
      aversion to how "swapcache" ends up being used there: rework it with
      "page != swapcache".
      
      Signed-off-by: default avatarHugh Dickins <hughd@google.com>
      Cc: Mel Gorman <mgorman@suse.de>
      Cc: Petr Holasek <pholasek@redhat.com>
      Cc: Andrea Arcangeli <aarcange@redhat.com>
      Cc: Izik Eidus <izik.eidus@ravellosystems.com>
      Acked-by: default avatarJohannes Weiner <hannes@cmpxchg.org>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      9e16b7fb
    • Hugh Dickins's avatar
      mm,ksm: FOLL_MIGRATION do migration_entry_wait · 5117b3b8
      Hugh Dickins authored
      
      
      In "ksm: remove old stable nodes more thoroughly" I said that I'd never
      seen its WARN_ON_ONCE(page_mapped(page)).  True at the time of writing,
      but it soon appeared once I tried fuller tests on the whole series.
      
      It turned out to be due to the KSM page migration itself: unmerge_and_
      remove_all_rmap_items() failed to locate and replace all the KSM pages,
      because of that hiatus in page migration when old pte has been replaced
      by migration entry, but not yet by new pte.  follow_page() finds no page
      at that instant, but a KSM page reappears shortly after, without a
      fault.
      
      Add FOLL_MIGRATION flag, so follow_page() can do migration_entry_wait()
      for KSM's break_cow().  I'd have preferred to avoid another flag, and do
      it every time, in case someone else makes the same easy mistake; but did
      not find another transgressor (the common get_user_pages() is of course
      safe), and cannot be sure that every follow_page() caller is prepared to
      sleep - ia64's xencomm_vtop()? Now, THP's wait_split_huge_page() can
      already sleep there, since anon_vma locking was changed to mutex, but
      maybe that's somehow excluded.
      
      Signed-off-by: default avatarHugh Dickins <hughd@google.com>
      Cc: Mel Gorman <mgorman@suse.de>
      Cc: Petr Holasek <pholasek@redhat.com>
      Cc: Andrea Arcangeli <aarcange@redhat.com>
      Cc: Izik Eidus <izik.eidus@ravellosystems.com>
      Cc: Johannes Weiner <hannes@cmpxchg.org>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      5117b3b8
    • Hugh Dickins's avatar
      ksm: shrink 32-bit rmap_item back to 32 bytes · bc56620b
      Hugh Dickins authored
      
      
      Think of struct rmap_item as an extension of struct page (restricted to
      MADV_MERGEABLE areas): there may be a lot of them, we need to keep them
      small, especially on 32-bit architectures of limited lowmem.
      
      Siting "int nid" after "unsigned int checksum" works nicely on 64-bit,
      making no change to its 64-byte struct rmap_item; but bloats the 32-bit
      struct rmap_item from (nicely cache-aligned) 32 bytes to 36 bytes, which
      rounds up to 40 bytes once allocated from slab.  We'd better avoid that.
      
      Hey, I only just remembered that the anon_vma pointer in struct
      rmap_item has no purpose until the rmap_item is hung from a stable tree
      node (which has its own nid field); and rmap_item's nid field no purpose
      than to say which tree root to tell rb_erase() when unlinking from an
      unstable tree.
      
      Double them up in a union.  There's just one place where we set anon_vma
      early (when we already hold mmap_sem): now we must remove tree_rmap_item
      from its unstable tree there, before overwriting nid.  No need to
      spatter BUG()s around: we'd be seeing oopses if this were wrong.
      
      Signed-off-by: default avatarHugh Dickins <hughd@google.com>
      Cc: Mel Gorman <mgorman@suse.de>
      Cc: Petr Holasek <pholasek@redhat.com>
      Cc: Andrea Arcangeli <aarcange@redhat.com>
      Cc: Izik Eidus <izik.eidus@ravellosystems.com>
      Cc: Johannes Weiner <hannes@cmpxchg.org>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      bc56620b
    • Hugh Dickins's avatar
      ksm: treat unstable nid like in stable tree · b599cbdf
      Hugh Dickins authored
      
      
      An inconsistency emerged in reviewing the NUMA node changes to KSM: when
      meeting a page from the wrong NUMA node in a stable tree, we say that
      it's okay for comparisons, but not as a leaf for merging; whereas when
      meeting a page from the wrong NUMA node in an unstable tree, we bail out
      immediately.
      
      Now, it might be that a wrong NUMA node in an unstable tree is more
      likely to correlate with instablility (different content, with rbnode
      now misplaced) than page migration; but even so, we are accustomed to
      instablility in the unstable tree.
      
      Without strong evidence for which strategy is generally better, I'd
      rather be consistent with what's done in the stable tree: accept a page
      from the wrong NUMA node for comparison, but not as a leaf for merging.
      
      Signed-off-by: default avatarHugh Dickins <hughd@google.com>
      Cc: Mel Gorman <mgorman@suse.de>
      Cc: Petr Holasek <pholasek@redhat.com>
      Cc: Andrea Arcangeli <aarcange@redhat.com>
      Cc: Izik Eidus <izik.eidus@ravellosystems.com>
      Cc: Johannes Weiner <hannes@cmpxchg.org>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      b599cbdf