1. 01 1月, 2012 1 次提交
    • H
      futex: Fix uninterruptible loop due to gate_area · e6780f72
      Hugh Dickins 提交于
      It was found (by Sasha) that if you use a futex located in the gate
      area we get stuck in an uninterruptible infinite loop, much like the
      ZERO_PAGE issue.
      
      While looking at this problem, PeterZ realized you'll get into similar
      trouble when hitting any install_special_pages() mapping.  And are there
      still drivers setting up their own special mmaps without page->mapping,
      and without special VM or pte flags to make get_user_pages fail?
      
      In most cases, if page->mapping is NULL, we do not need to retry at all:
      Linus points out that even /proc/sys/vm/drop_caches poses no problem,
      because it ends up using remove_mapping(), which takes care not to
      interfere when the page reference count is raised.
      
      But there is still one case which does need a retry: if memory pressure
      called shmem_writepage in between get_user_pages_fast dropping page
      table lock and our acquiring page lock, then the page gets switched from
      filecache to swapcache (and ->mapping set to NULL) whatever the refcount.
      Fault it back in to get the page->mapping needed for key->shared.inode.
      Reported-by: NSasha Levin <levinsasha928@gmail.com>
      Signed-off-by: NHugh Dickins <hughd@google.com>
      Cc: stable@vger.kernel.org
      Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      e6780f72
  2. 31 12月, 2011 7 次提交
  3. 30 12月, 2011 11 次提交
    • L
      Merge branch 'iommu/fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu · 89307bab
      Linus Torvalds 提交于
      * 'iommu/fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu:
        iommu: Initialize domain->handler in iommu_domain_alloc()
      89307bab
    • L
      Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net · 50b2abed
      Linus Torvalds 提交于
      * git://git.kernel.org/pub/scm/linux/kernel/git/davem/net:
        packet: fix possible dev refcnt leak when bind fail
        netem: dont call vfree() under spinlock and BH disabled
        netfilter: ctnetlink: fix scheduling while atomic if helper is autoloaded
        netfilter: ctnetlink: fix return value of ctnetlink_get_expect()
      50b2abed
    • L
      Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · 7578ed02
      Linus Torvalds 提交于
      * 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
        perf/x86: Fix raw_spin_unlock_irqrestore() usage
        oprofile, arm/sh: Fix oprofile_arch_exit() linkage issue
      7578ed02
    • L
      Merge branch 'for-linus' of git://oss.sgi.com/xfs/xfs · d2bac6ab
      Linus Torvalds 提交于
      * 'for-linus' of git://oss.sgi.com/xfs/xfs:
        xfs: log all dirty inodes in xfs_fs_sync_fs
        xfs: log the inode in ->write_inode calls for kupdate
      d2bac6ab
    • L
      Merge branch 'for-linus' of git://git.kernel.dk/linux-block · 1cac8e88
      Linus Torvalds 提交于
      * 'for-linus' of git://git.kernel.dk/linux-block:
        block: fix blk_queue_end_tag()
        block: re-use existing 'reading' variable instead of checking direction again
        block, cfq: fix empty queue crash caused by request merge
      1cac8e88
    • H
      mm: hugetlb: fix non-atomic enqueue of huge page · b0365c8d
      Hillf Danton 提交于
      If a huge page is enqueued under the protection of hugetlb_lock, then the
      operation is atomic and safe.
      Signed-off-by: NHillf Danton <dhillf@gmail.com>
      Reviewed-by: NMichal Hocko <mhocko@suse.cz>
      Acked-by: NKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
      Cc: <stable@vger.kernel.org>		[2.6.37+]
      Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      b0365c8d
    • A
      procfs: do not confuse jiffies with cputime64_t · 34845636
      Andreas Schwab 提交于
      Commit 2a95ea6c ("procfs: do not overflow get_{idle,iowait}_time
      for nohz") did not take into account that one some architectures jiffies
      and cputime use different units.
      
      This causes get_idle_time() to return numbers in the wrong units, making
      the idle time fields in /proc/stat wrong.
      
      Instead of converting the usec value returned by
      get_cpu_{idle,iowait}_time_us to units of jiffies, use the new function
      usecs_to_cputime64 to convert it to the correct unit of cputime64_t.
      Signed-off-by: NAndreas Schwab <schwab@linux-m68k.org>
      Acked-by: NMichal Hocko <mhocko@suse.cz>
      Cc: Arnd Bergmann <arnd@arndb.de>
      Cc: "Artem S. Tashkinov" <t.artem@mailcity.com>
      Cc: Dave Jones <davej@redhat.com>
      Cc: Alexey Dobriyan <adobriyan@gmail.com>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: "Luck, Tony" <tony.luck@intel.com>
      Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
      Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
      Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
      Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      34845636
    • K
      mm/mempolicy.c: refix mbind_range() vma issue · e26a5114
      KOSAKI Motohiro 提交于
      commit 8aacc9f5 ("mm/mempolicy.c: fix pgoff in mbind vma merge") is the
      slightly incorrect fix.
      
      Why? Think following case.
      
      1. map 4 pages of a file at offset 0
      
         [0123]
      
      2. map 2 pages just after the first mapping of the same file but with
         page offset 2
      
         [0123][23]
      
      3. mbind() 2 pages from the first mapping at offset 2.
         mbind_range() should treat new vma is,
      
         [0123][23]
           |23|
           mbind vma
      
         but it does
      
         [0123][23]
           |01|
           mbind vma
      
         Oops. then, it makes wrong vma merge and splitting ([01][0123] or similar).
      
      This patch fixes it.
      
      [testcase]
        test result - before the patch
      
      	case4: 126: test failed. expect '2,4', actual '2,2,2'
             	case5: passed
      	case6: passed
      	case7: passed
      	case8: passed
      	case_n: 246: test failed. expect '4,2', actual '1,4'
      
      	------------[ cut here ]------------
      	kernel BUG at mm/filemap.c:135!
      	invalid opcode: 0000 [#4] SMP DEBUG_PAGEALLOC
      
      	(snip long bug on messages)
      
        test result - after the patch
      
      	case4: passed
             	case5: passed
      	case6: passed
      	case7: passed
      	case8: passed
      	case_n: passed
      
        source:  mbind_vma_test.c
      ============================================================
       #include <numaif.h>
       #include <numa.h>
       #include <sys/mman.h>
       #include <stdio.h>
       #include <unistd.h>
       #include <stdlib.h>
       #include <string.h>
      
      static unsigned long pagesize;
      void* mmap_addr;
      struct bitmask *nmask;
      char buf[1024];
      FILE *file;
      char retbuf[10240] = "";
      int mapped_fd;
      
      char *rubysrc = "ruby -e '\
        pid = %d; \
        vstart = 0x%llx; \
        vend = 0x%llx; \
        s = `pmap -q #{pid}`; \
        rary = []; \
        s.each_line {|line|; \
          ary=line.split(\" \"); \
          addr = ary[0].to_i(16); \
          if(vstart <= addr && addr < vend) then \
            rary.push(ary[1].to_i()/4); \
          end; \
        }; \
        print rary.join(\",\"); \
      '";
      
      void init(void)
      {
      	void* addr;
      	char buf[128];
      
      	nmask = numa_allocate_nodemask();
      	numa_bitmask_setbit(nmask, 0);
      
      	pagesize = getpagesize();
      
      	sprintf(buf, "%s", "mbind_vma_XXXXXX");
      	mapped_fd = mkstemp(buf);
      	if (mapped_fd == -1)
      		perror("mkstemp "), exit(1);
      	unlink(buf);
      
      	if (lseek(mapped_fd, pagesize*8, SEEK_SET) < 0)
      		perror("lseek "), exit(1);
      	if (write(mapped_fd, "\0", 1) < 0)
      		perror("write "), exit(1);
      
      	addr = mmap(NULL, pagesize*8, PROT_NONE,
      		    MAP_SHARED, mapped_fd, 0);
      	if (addr == MAP_FAILED)
      		perror("mmap "), exit(1);
      
      	if (mprotect(addr+pagesize, pagesize*6, PROT_READ|PROT_WRITE) < 0)
      		perror("mprotect "), exit(1);
      
      	mmap_addr = addr + pagesize;
      
      	/* make page populate */
      	memset(mmap_addr, 0, pagesize*6);
      }
      
      void fin(void)
      {
      	void* addr = mmap_addr - pagesize;
      	munmap(addr, pagesize*8);
      
      	memset(buf, 0, sizeof(buf));
      	memset(retbuf, 0, sizeof(retbuf));
      }
      
      void mem_bind(int index, int len)
      {
      	int err;
      
      	err = mbind(mmap_addr+pagesize*index, pagesize*len,
      		    MPOL_BIND, nmask->maskp, nmask->size, 0);
      	if (err)
      		perror("mbind "), exit(err);
      }
      
      void mem_interleave(int index, int len)
      {
      	int err;
      
      	err = mbind(mmap_addr+pagesize*index, pagesize*len,
      		    MPOL_INTERLEAVE, nmask->maskp, nmask->size, 0);
      	if (err)
      		perror("mbind "), exit(err);
      }
      
      void mem_unbind(int index, int len)
      {
      	int err;
      
      	err = mbind(mmap_addr+pagesize*index, pagesize*len,
      		    MPOL_DEFAULT, NULL, 0, 0);
      	if (err)
      		perror("mbind "), exit(err);
      }
      
      void Assert(char *expected, char *value, char *name, int line)
      {
      	if (strcmp(expected, value) == 0) {
      		fprintf(stderr, "%s: passed\n", name);
      		return;
      	}
      	else {
      		fprintf(stderr, "%s: %d: test failed. expect '%s', actual '%s'\n",
      			name, line,
      			expected, value);
      //		exit(1);
      	}
      }
      
      /*
            AAAA
          PPPPPPNNNNNN
          might become
          PPNNNNNNNNNN
          case 4 below
      */
      void case4(void)
      {
      	init();
      	sprintf(buf, rubysrc, getpid(), mmap_addr, mmap_addr+pagesize*6);
      
      	mem_bind(0, 4);
      	mem_unbind(2, 2);
      
      	file = popen(buf, "r");
      	fread(retbuf, sizeof(retbuf), 1, file);
      	Assert("2,4", retbuf, "case4", __LINE__);
      
      	fin();
      }
      
      /*
             AAAA
       PPPPPPNNNNNN
       might become
       PPPPPPPPPPNN
       case 5 below
      */
      void case5(void)
      {
      	init();
      	sprintf(buf, rubysrc, getpid(), mmap_addr, mmap_addr+pagesize*6);
      
      	mem_bind(0, 2);
      	mem_bind(2, 2);
      
      	file = popen(buf, "r");
      	fread(retbuf, sizeof(retbuf), 1, file);
      	Assert("4,2", retbuf, "case5", __LINE__);
      
      	fin();
      }
      
      /*
      	    AAAA
      	PPPPNNNNXXXX
      	might become
      	PPPPPPPPPPPP 6
      */
      void case6(void)
      {
      	init();
      	sprintf(buf, rubysrc, getpid(), mmap_addr, mmap_addr+pagesize*6);
      
      	mem_bind(0, 2);
      	mem_bind(4, 2);
      	mem_bind(2, 2);
      
      	file = popen(buf, "r");
      	fread(retbuf, sizeof(retbuf), 1, file);
      	Assert("6", retbuf, "case6", __LINE__);
      
      	fin();
      }
      
      /*
          AAAA
      PPPPNNNNXXXX
      might become
      PPPPPPPPXXXX 7
      */
      void case7(void)
      {
      	init();
      	sprintf(buf, rubysrc, getpid(), mmap_addr, mmap_addr+pagesize*6);
      
      	mem_bind(0, 2);
      	mem_interleave(4, 2);
      	mem_bind(2, 2);
      
      	file = popen(buf, "r");
      	fread(retbuf, sizeof(retbuf), 1, file);
      	Assert("4,2", retbuf, "case7", __LINE__);
      
      	fin();
      }
      
      /*
          AAAA
      PPPPNNNNXXXX
      might become
      PPPPNNNNNNNN 8
      */
      void case8(void)
      {
      	init();
      	sprintf(buf, rubysrc, getpid(), mmap_addr, mmap_addr+pagesize*6);
      
      	mem_bind(0, 2);
      	mem_interleave(4, 2);
      	mem_interleave(2, 2);
      
      	file = popen(buf, "r");
      	fread(retbuf, sizeof(retbuf), 1, file);
      	Assert("2,4", retbuf, "case8", __LINE__);
      
      	fin();
      }
      
      void case_n(void)
      {
      	init();
      	sprintf(buf, rubysrc, getpid(), mmap_addr, mmap_addr+pagesize*6);
      
      	/* make redundunt mappings [0][1234][34][7] */
      	mmap(mmap_addr + pagesize*4, pagesize*2, PROT_READ|PROT_WRITE,
      	     MAP_FIXED|MAP_SHARED, mapped_fd, pagesize*3);
      
      	/* Expect to do nothing. */
      	mem_unbind(2, 2);
      
      	file = popen(buf, "r");
      	fread(retbuf, sizeof(retbuf), 1, file);
      	Assert("4,2", retbuf, "case_n", __LINE__);
      
      	fin();
      }
      
      int main(int argc, char** argv)
      {
      	case4();
      	case5();
      	case6();
      	case7();
      	case8();
      	case_n();
      
      	return 0;
      }
      =============================================================
      Signed-off-by: NKOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
      Acked-by: NJohannes Weiner <hannes@cmpxchg.org>
      Cc: Minchan Kim <minchan.kim@gmail.com>
      Cc: Caspar Zhang <caspar@casparzhang.com>
      Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
      Cc: Christoph Lameter <cl@linux.com>
      Cc: Hugh Dickins <hugh.dickins@tiscali.co.uk>
      Cc: Mel Gorman <mel@csn.ul.ie>
      Cc: Lee Schermerhorn <lee.schermerhorn@hp.com>
      Cc: <stable@vger.kernel.org>		[3.1.x]
      Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      e26a5114
    • H
      gspca: Fix bulk mode cameras no longer working (regression fix) · 757e55c2
      Hans de Goede 提交于
      The new iso bandwidth calculation code accidentally has broken support
      for bulk mode cameras. This has broken the following drivers:
      finepix, jeilinj, ovfx2, ov534, ov534_9, se401, sq905, sq905c, sq930x,
      stv0680, vicam.
      
      Thix patch fixes this. Fix tested with: se401, sq905, sq905c, stv0680 & vicam
      cams.
      Signed-off-by: NHans de Goede <hdegoede@redhat.com>
      Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>
      Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      757e55c2
    • T
      Input: sentelic - fix retrieving number of buttons · 6ccbcf2c
      Tai-hwa Liang 提交于
      Fixing wrong register offset which is used to retrieve the number of buttons
      attached to the hardware.
      Signed-off-by: NTai-hwa Liang <avatar@sentelic.com>
      Signed-off-by: NDmitry Torokhov <dtor@mail.ru>
      6ccbcf2c
    • S
      ceph: disable use of dcache for readdir etc. · a4d46363
      Sage Weil 提交于
      Ceph attempts to use the dcache to satisfy negative lookups and readdir
      when the entire directory contents are in cache.  Disable this behavior
      until lingering bugs in this code are shaken out; we'll re-enable these
      hooks once things are fully stable.
      Signed-off-by: NSage Weil <sage@newdream.net>
      a4d46363
  4. 29 12月, 2011 1 次提交
  5. 28 12月, 2011 4 次提交
  6. 27 12月, 2011 5 次提交
  7. 26 12月, 2011 9 次提交
  8. 25 12月, 2011 2 次提交