1. 23 Apr, 2014 6 commits
  2. 22 Apr, 2014 5 commits
  3. 21 Apr, 2014 2 commits
  4. 19 Apr, 2014 15 commits
  5. 18 Apr, 2014 12 commits
    • Linus Torvalds's avatar
      Merge tag 'driver-core-3.15-rc2' of... · 60fbf2bd
      Linus Torvalds authored
      Merge tag 'driver-core-3.15-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core
      
      Pull driver core fixes from Greg KH:
       "Here are some driver core fixes for 3.15-rc2.  Also in here are some
        documentation updates, as well as an API removal that had to wait for
        after -rc1 due to the cleanups coming into you from multiple developer
        trees (this one and the PPC tree.)
      
        All have been in linux next successfully"
      
      * tag 'driver-core-3.15-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core:
        drivers/base/dd.c incorrect pr_debug() parameters
        Documentation: Update stable address in Chinese and Japanese translations
        topology: Fix compilation warning when not in SMP
        Chinese: add translation of io_ordering.txt
        stable_kernel_rules: spelling/word usage
        sysfs, driver-core: remove unused {sysfs|device}_schedule_callback_owner()
        kernfs: protect lazy kernfs_iattrs allocation with mutex
        fs: Don't return 0 from get_anon_bdev
      60fbf2bd
    • Linus Torvalds's avatar
      Merge tag 'staging-3.15-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging · 8cb652bb
      Linus Torvalds authored
      Pull staging driver fixes from Greg KH:
       "Here are a few staging driver fixes for issues that have been reported
        for 3.15-rc2.
      
        Also dominating the diffstat for the pull request is the removal of
        the rtl8187se driver.  It's no longer needed in staging as a "real"
        driver for this hardware is now merged in the tree in the "correct"
        location in drivers/net/
      
        All of these patches have been tested in linux-next"
      
      * tag 'staging-3.15-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging:
        staging: r8188eu: Fix case where ethtype was never obtained and always be checked against 0
        staging: r8712u: Fix case where ethtype was never obtained and always be checked against 0
        staging: r8188eu: Calling rtw_get_stainfo() with a NULL sta_addr will return NULL
        staging: comedi: fix circular locking dependency in comedi_mmap()
        staging: r8723au: Add missing initialization of change_inx in sort algorithm
        Staging: unisys: use after free in list_for_each()
        staging: unisys: use after free in error messages
        staging: speakup: fix misuse of kstrtol() in handle_goto()
        staging: goldfish: Call free_irq in error path
        staging: delete rtl8187se wireless driver
        staging: rtl8723au: Fix buffer overflow in rtw_get_wfd_ie()
        staging: gs_fpgaboot: remove __TIMESTAMP__ macro
        staging: vme: fix memory leak in vme_user_probe()
        staging: fpgaboot: clean up Makefile
        staging/usbip: fix store_attach() sscanf return value check
        staging/usbip: userspace - fix usbipd SIGSEGV from refresh_exported_devices()
        staging: rtl8188eu: remove spaces, correct counts to unbreak P2P ioctls
        staging/rtl8821ae: Fix OOM handling in _rtl_init_deferred_work()
      8cb652bb
    • Linus Torvalds's avatar
      Merge tag 'tty-3.15-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty · 575a2929
      Linus Torvalds authored
      Pull tty/serial driver fixes from Greg KH:
       "Here are a number of small tty/serial driver fixes for 3.15-rc2.  Also
        in here are some Documentation file removals for drivers that we
        removed a long time ago, no need to keep it around any longer.
      
        All of these have been in linux-next for a bit"
      
      * tag 'tty-3.15-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty:
        Revert "serial: 8250, disable "too much work" messages"
        serial: amba-pl011: fix regression, causing an Oops on rmmod
        tty: Fix help text of SYNCLINK_CS
        tty: fix memleak in alloc_pid
        ttyprintk: Allow built as a module
        ttyprintk: Fix wrong tty_unregister_driver() call in the error path
        serial: 8250, disable "too much work" messages
        Documentation/serial: Delete obsolete driver documentation
        serial: omap: Fix missing pm_runtime_resume handling by simplifying code
        serial_core: Fix pm imbalance on unbind
        serial: pl011: change Rx burst size to half of trigger level
        serial: timberdale: Depend on X86_32
        serial: st-asc: Fix SysRq char handling
        Revert "serial: clps711x: Give a chance to perform useful tasks during wait loop"
        serial_core: Fix conditional start_tx on ring buffer not empty
        serial: efm32: use $vendor,$device scheme for compatible string
        serial: omap: free the wakeup settings in remove
      575a2929
    • Linus Torvalds's avatar
      Merge tag 'usb-3.15-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb · 7e55f81e
      Linus Torvalds authored
      Pull USB fixes from Greg KH:
       "Here are a number of tiny USB fixes and new device ids for 3.15-rc2.
        Nothing major, just issues some people have reported.
      
        All of these have been in linux-next"
      
      * tag 'usb-3.15-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb:
        uas: fix deadlocky memory allocations
        uas: fix error handling during scsi_scan()
        uas: fix GFP_NOIO under spinlock
        uwb: adds missing error handling
        USB: cdc-acm: Remove Motorola/Telit H24 serial interfaces from ACM driver
        USB: ohci-jz4740: FEAT_POWER is a port feature, not a hub feature
        USB: ohci-jz4740: Fix uninitialized variable warning
        USB: EHCI: tegra: set txfill_tuning
        usb: ehci-platform: Return immediately from suspend if ehci_suspend fails
        usb: ehci-exynos: Return immediately from suspend if ehci_suspend fails
        USB: fix crash during hotplug of PCI USB controller card
        USB: cdc-acm: fix double usb_autopm_put_interface() in acm_port_activate()
        usb: usb-common: fix typo for usb_state_string
        USB: usb_wwan: fix handling of missing bulk endpoints
        USB: pl2303: add ids for Hewlett-Packard HP POS pole displays
        USB: cp210x: Add 8281 (Nanotec Plug & Drive)
        usb: option driver, add support for Telit UE910v2
        Revert "USB: serial: add usbid for dell wwan card to sierra.c"
        USB: serial: ftdi_sio: add id for Brainboxes serial cards
      7e55f81e
    • Linus Torvalds's avatar
      Merge branch 'akpm' (incoming from Andrew) · ea2388f2
      Linus Torvalds authored
      Merge misc fixes from Andrew Morton:
       "13 fixes"
      
      * emailed patches from Andrew Morton <akpm@linux-foundation.org>:
        thp: close race between split and zap huge pages
        mm: fix new kernel-doc warning in filemap.c
        mm: fix CONFIG_DEBUG_VM_RB description
        mm: use paravirt friendly ops for NUMA hinting ptes
        mips: export flush_icache_range
        mm/hugetlb.c: add cond_resched_lock() in return_unused_surplus_pages()
        wait: explain the shadowing and type inconsistencies
        Shiraz has moved
        Documentation/vm/numa_memory_policy.txt: fix wrong document in numa_memory_policy.txt
        powerpc/mm: fix ".__node_distance" undefined
        kernel/watchdog.c:touch_softlockup_watchdog(): use raw_cpu_write()
        init/Kconfig: move the trusted keyring config option to general setup
        vmscan: reclaim_clean_pages_from_list() must use mod_zone_page_state()
      ea2388f2
    • Kirill A. Shutemov's avatar
      thp: close race between split and zap huge pages · b5a8cad3
      Kirill A. Shutemov authored
      Sasha Levin has reported two THP BUGs[1][2].  I believe both of them
      have the same root cause.  Let's look to them one by one.
      
      The first bug[1] is "kernel BUG at mm/huge_memory.c:1829!".  It's
      BUG_ON(mapcount != page_mapcount(page)) in __split_huge_page().  From my
      testing I see that page_mapcount() is higher than mapcount here.
      
      I think it happens due to race between zap_huge_pmd() and
      page_check_address_pmd().  page_check_address_pmd() misses PMD which is
      under zap:
      
      	CPU0						CPU1
      						zap_huge_pmd()
      						  pmdp_get_and_clear()
      __split_huge_page()
        anon_vma_interval_tree_foreach()
          __split_huge_page_splitting()
            page_check_address_pmd()
              mm_find_pmd()
      	  /*
      	   * We check if PMD present without taking ptl: no
      	   * serialization against zap_huge_pmd(). We miss this PMD,
      	   * it's not accounted to 'mapcount' in __split_huge_page().
      	   */
      	  pmd_present(pmd) == 0
      
        BUG_ON(mapcount != page_mapcount(page)) // CRASH!!!
      
      						  page_remove_rmap(page)
      						    atomic_add_negative(-1, &page->_mapcount)
      
      The second bug[2] is "kernel BUG at mm/huge_memory.c:1371!".
      It's VM_BUG_ON_PAGE(!PageHead(page), page) in zap_huge_pmd().
      
      This happens in similar way:
      
      	CPU0						CPU1
      						zap_huge_pmd()
      						  pmdp_get_and_clear()
      						  page_remove_rmap(page)
      						    atomic_add_negative(-1, &page->_mapcount)
      __split_huge_page()
        anon_vma_interval_tree_foreach()
          __split_huge_page_splitting()
            page_check_address_pmd()
              mm_find_pmd()
      	  pmd_present(pmd) == 0	/* The same comment as above */
        /*
         * No crash this time since we already decremented page->_mapcount in
         * zap_huge_pmd().
         */
        BUG_ON(mapcount != page_mapcount(page))
      
        /*
         * We split the compound page here into small pages without
         * serialization against zap_huge_pmd()
         */
        __split_huge_page_refcount()
      						VM_BUG_ON_PAGE(!PageHead(page), page); // CRASH!!!
      
      So my understanding the problem is pmd_present() check in mm_find_pmd()
      without taking page table lock.
      
      The bug was introduced by me commit with commit 117b0791. Sorry for
      that. :(
      
      Let's open code mm_find_pmd() in page_check_address_pmd() and do the
      check under page table lock.
      
      Note that __page_check_address() does the same for PTE entires
      if sync != 0.
      
      I've stress tested split and zap code paths for 36+ hours by now and
      don't see crashes with the patch applied. Before it took <20 min to
      trigger the first bug and few hours for second one (if we ignore
      first).
      
      [1] https://lkml.kernel.org/g/<53440991.9090001@oracle.com>
      [2] https://lkml.kernel.org/g/<5310C56C.60709@oracle.com>
      Signed-off-by: default avatarKirill A. Shutemov <kirill.shutemov@linux.intel.com>
      Reported-by: default avatarSasha Levin <sasha.levin@oracle.com>
      Tested-by: default avatarSasha Levin <sasha.levin@oracle.com>
      Cc: Bob Liu <lliubbo@gmail.com>
      Cc: Andrea Arcangeli <aarcange@redhat.com>
      Cc: Rik van Riel <riel@redhat.com>
      Cc: Mel Gorman <mgorman@suse.de>
      Cc: Michel Lespinasse <walken@google.com>
      Cc: Dave Jones <davej@redhat.com>
      Cc: Vlastimil Babka <vbabka@suse.cz>
      Cc: <stable@vger.kernel.org>	[3.13+]
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      b5a8cad3
    • Randy Dunlap's avatar
      mm: fix new kernel-doc warning in filemap.c · b59b8cbc
      Randy Dunlap authored
      Fix new kernel-doc warning in mm/filemap.c:
      
        Warning(mm/filemap.c:2600): Excess function parameter 'ppos' description in '__generic_file_aio_write'
      Signed-off-by: default avatarRandy Dunlap <rdunlap@infradead.org>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      b59b8cbc
    • Davidlohr Bueso's avatar
      mm: fix CONFIG_DEBUG_VM_RB description · a663dad6
      Davidlohr Bueso authored
      This appears to be a copy/paste error.  Update the description to
      reflect extra rbtree debug and checks for the config option instead of
      duplicating CONFIG_DEBUG_VM.
      Signed-off-by: default avatarDavidlohr Bueso <davidlohr@hp.com>
      Cc: Aswin Chandramouleeswaran <aswin@hp.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      a663dad6
    • Mel Gorman's avatar
      mm: use paravirt friendly ops for NUMA hinting ptes · 29c77870
      Mel Gorman authored
      David Vrabel identified a regression when using automatic NUMA balancing
      under Xen whereby page table entries were getting corrupted due to the
      use of native PTE operations.  Quoting him
      
      	Xen PV guest page tables require that their entries use machine
      	addresses if the preset bit (_PAGE_PRESENT) is set, and (for
      	successful migration) non-present PTEs must use pseudo-physical
      	addresses.  This is because on migration MFNs in present PTEs are
      	translated to PFNs (canonicalised) so they may be translated back
      	to the new MFN in the destination domain (uncanonicalised).
      
      	pte_mknonnuma(), pmd_mknonnuma(), pte_mknuma() and pmd_mknuma()
      	set and clear the _PAGE_PRESENT bit using pte_set_flags(),
      	pte_clear_flags(), etc.
      
      	In a Xen PV guest, these functions must translate MFNs to PFNs
      	when clearing _PAGE_PRESENT and translate PFNs to MFNs when setting
      	_PAGE_PRESENT.
      
      His suggested fix converted p[te|md]_[set|clear]_flags to using
      paravirt-friendly ops but this is overkill.  He suggested an alternative
      of using p[te|md]_modify in the NUMA page table operations but this is
      does more work than necessary and would require looking up a VMA for
      protections.
      
      This patch modifies the NUMA page table operations to use paravirt
      friendly operations to set/clear the flags of interest.  Unfortunately
      this will take a performance hit when updating the PTEs on
      CONFIG_PARAVIRT but I do not see a way around it that does not break
      Xen.
      Signed-off-by: default avatarMel Gorman <mgorman@suse.de>
      Acked-by: default avatarDavid Vrabel <david.vrabel@citrix.com>
      Tested-by: default avatarDavid Vrabel <david.vrabel@citrix.com>
      Cc: Ingo Molnar <mingo@kernel.org>
      Cc: Peter Anvin <hpa@zytor.com>
      Cc: Fengguang Wu <fengguang.wu@intel.com>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Steven Noonan <steven@uplinklabs.net>
      Cc: Rik van Riel <riel@redhat.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Andrea Arcangeli <aarcange@redhat.com>
      Cc: Dave Hansen <dave.hansen@intel.com>
      Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
      Cc: Cyrill Gorcunov <gorcunov@gmail.com>
      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>
      29c77870
    • Kees Cook's avatar
      mips: export flush_icache_range · 8229f1a0
      Kees Cook authored
      The lkdtm module performs tests against executable memory ranges, so it
      needs to flush the icache for proper behaviors.  Other architectures
      already export this, so do the same for MIPS.
      
      [akpm@linux-foundation.org: relocate export sites]
      Signed-off-by: default avatarKees Cook <keescook@chromium.org>
      Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
      Cc: Ralf Baechle <ralf@linux-mips.org>
      Cc: Sanjay Lal <sanjayl@kymasys.com>
      Cc: John Crispin <blogic@openwrt.org>
      Cc: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      8229f1a0
    • Mizuma, Masayoshi's avatar
      mm/hugetlb.c: add cond_resched_lock() in return_unused_surplus_pages() · 7848a4bf
      Mizuma, Masayoshi authored
      soft lockup in freeing gigantic hugepage fixed in commit 55f67141 "mm:
      hugetlb: fix softlockup when a large number of hugepages are freed." can
      happen in return_unused_surplus_pages(), so let's fix it.
      Signed-off-by: default avatarMasayoshi Mizuma <m.mizuma@jp.fujitsu.com>
      Signed-off-by: default avatarNaoya Horiguchi <n-horiguchi@ah.jp.nec.com>
      Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
      Cc: Michal Hocko <mhocko@suse.cz>
      Cc: Aneesh Kumar <aneesh.kumar@linux.vnet.ibm.com>
      Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
      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>
      7848a4bf
    • Peter Zijlstra's avatar
      wait: explain the shadowing and type inconsistencies · 8b32201d
      Peter Zijlstra authored
      Stick in a comment before someone else tries to fix the sparse warning
      this generates.
      Suggested-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarPeter Zijlstra <peterz@infradead.org>
      Link: http://lkml.kernel.org/n/tip-o2ro6f3vkxklni0bc8f7m68s@git.kernel.orgSigned-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      8b32201d