1. 05 Sep, 2003 7 commits
    • Paul Fulghum's avatar
      [PATCH] 2.6.0-test4 synclink.c · 85a98c38
      Paul Fulghum authored
      * add RCC underrun handling
      * fix stats output typo
      * replace previously removed NULL context check
        (causes oops when opening non existent device)
      85a98c38
    • Arjan van de Ven's avatar
      [PATCH] incomplete asm constraints in arch/i386/pci/pcbios.c · 8ac81570
      Arjan van de Ven authored
      This fixes a "miscompile" HP reported against gcc 3.3 with
      -march-pentium4.  It turned out to be a non-complete asm contraint.  the
      existing constraint on "opt" was on the address of "opt", which allowed
      gcc to reorder the setting of the fields inside opt to beyond the asm
      that uses it, which is less than useful at best.
      8ac81570
    • Jamie Lokier's avatar
      [PATCH] Unpinned futexes v2: indexing changes · 968f11a8
      Jamie Lokier authored
      This changes the way futexes are indexed, so that they don't pin pages. 
      It also fixes some bugs with private mappings and COW pages.
      
      Currently, all futexes look up the page at the userspace address and pin
      it, using the pair (page,offset) as an index into a table of waiting
      futexes.  Any page with a futex waiting on it remains pinned in RAM,
      which is a problem when many futexes are used, especially with FUTEX_FD.
      
      Another problem is that the page is not always the correct one, if it
      can be changed later by a COW (copy on write) operation.  This can
      happen when waiting on a futex without writing to it after fork(),
      exec() or mmap(), if the page is then written to before attempting to
      wake a futex at the same adress. 
      
      There are two symptoms of the COW problem:
       - The wrong process can receive wakeups
       - A process can fail to receive required wakeups. 
      
      This patch fixes both by changing the indexing so that VM_SHARED
      mappings use the triple (inode,offset,index), and private mappings use
      the pair (mm,virtual_address).
      
      The former correctly handles all shared mappings, including tmpfs and
      therefore all kinds of shared memory (IPC shm, /dev/shm and
      MAP_ANON|MAP_SHARED).  This works because every mapping which is
      VM_SHARED has an associated non-zero vma->vm_file, and hence inode.
      (This is ensured in do_mmap_pgoff, where it calls shmem_zero_setup). 
      
      The latter handles all private mappings, both files and anonymous.  It
      isn't affected by COW, because it doesn't care about the actual pages,
      just the virtual address.
      
      The patch has a few bonuses:
      
              1. It removes the vcache implementation, as only futexes were
                 using it, and they don't any more.
      
              2. Removing the vcache should make COW page faults a bit faster.
      
              3. Futex operations no longer take the page table lock, walk
                 the page table, fault in pages that aren't mapped in the
                 page table, or do a vcache hash lookup - they are mostly a
                 simple offset calculation with one hash for the futex
                 table.  So they should be noticably faster.
      
      Special thanks to Hugh Dickins, Andrew Morton and Rusty Russell for
      insightful feedback.  All suggestions are included.
      968f11a8
    • Linus Torvalds's avatar
      Merge bk://kernel.bkbits.net/davem/net-2.5 · 707c584e
      Linus Torvalds authored
      into home.osdl.org:/home/torvalds/v2.5/linux
      707c584e
    • Bartlomiej Zolnierkiewicz's avatar
      [PATCH] ide: fix ide_cs oops with TCQ · b99c2656
      Bartlomiej Zolnierkiewicz authored
      From Matias Alejo Garcia <kernel@matiu.com.ar>.
      b99c2656
    • Russell King's avatar
      [PATCH] Move MODULE_ALIAS_LDISC to tty_ldisc.h · 73790646
      Russell King authored
      MODULE_ALIAS_LDISC() is not in any way architecture-specific, so don't
      put it in architecture header files.
      
      Here's a patch which moves it to a more sensible location.
      73790646
    • Jens Axboe's avatar
      [PATCH] fix IO hangs · cadf0417
      Jens Axboe authored
      The "insert_here" list pointer logic was broken, and unnecessary. 
      
      Kill it and its associated logic off completely - just tell the IO
      scheduler what kind of insert it is.
      
      This also makes the *_insert_request strategies much easier to follow,
      imo.
      cadf0417
  2. 04 Sep, 2003 28 commits
  3. 03 Sep, 2003 5 commits