1. 29 9月, 2013 1 次提交
    • E
      net: introduce SO_MAX_PACING_RATE · 62748f32
      Eric Dumazet 提交于
      As mentioned in commit afe4fd06 ("pkt_sched: fq: Fair Queue packet
      scheduler"), this patch adds a new socket option.
      
      SO_MAX_PACING_RATE offers the application the ability to cap the
      rate computed by transport layer. Value is in bytes per second.
      
      u32 val = 1000000;
      setsockopt(sockfd, SOL_SOCKET, SO_MAX_PACING_RATE, &val, sizeof(val));
      
      To be effectively paced, a flow must use FQ packet scheduler.
      
      Note that a packet scheduler takes into account the headers for its
      computations. The effective payload rate depends on MSS and retransmits
      if any.
      
      I chose to make this pacing rate a SOL_SOCKET option instead of a
      TCP one because this can be used by other protocols.
      Signed-off-by: NEric Dumazet <edumazet@google.com>
      Cc: Steinar H. Gunderson <sesse@google.com>
      Cc: Michael Kerrisk <mtk.manpages@gmail.com>
      Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      62748f32
  2. 01 8月, 2013 1 次提交
    • T
      parisc: Fix interrupt routing for C8000 serial ports · dd5e6d6a
      Thomas Bogendoerfer 提交于
      We can't use dev->mod_index for selecting the interrupt routing entry,
      because it's not an index into interrupt routing table. It will be even
      wrong on a machine with 2 CPUs (4 cores). But all needed information is
      contained in the PAT entries for the serial ports. mod[0] contains the
      iosapic address and mod_info has some indications for the interrupt
      input (at least it looks like it). This patch implements the searching
      for the right iosapic and uses this interrupt input information.
      Signed-off-by: NThomas Bogendoerfer <tsbogend@alpha.franken.de>
      Cc: <stable@vger.kernel.org> # 3.10
      Signed-off-by: NHelge Deller <deller@gmx.de>
      dd5e6d6a
  3. 13 7月, 2013 1 次提交
    • A
      Safer ABI for O_TMPFILE · bb458c64
      Al Viro 提交于
      [suggested by Rasmus Villemoes] make O_DIRECTORY | O_RDWR part of O_TMPFILE;
      that will fail on old kernels in a lot more cases than what I came up with.
      And make sure O_CREAT doesn't get there...
      Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
      bb458c64
  4. 11 7月, 2013 1 次提交
  5. 10 7月, 2013 2 次提交
    • J
      parisc: Ensure volatile space register %sr1 is not clobbered · e8d8fc21
      John David Anglin 提交于
      I still see the occasional random segv on rp3440.  Looking at one of
      these (a code 15), it appeared the problem must be with the cache
      handling of anonymous pages.  Reviewing this, I noticed that the space
      register %sr1 might be being clobbered when we flush an anonymous page.
      
      Register %sr1 is used for TLB purges in a couple of places.  These
      purges are needed on PA8800 and PA8900 processors to ensure cache
      consistency of flushed cache lines.
      
      The solution here is simply to move the %sr1 load into the TLB lock
      region needed to ensure that one purge executes at a time on SMP
      systems.  This was already the case for one use.  After a few days of
      operation, I haven't had a random segv on my rp3440.
      Signed-off-by: NJohn David Anglin <dave.anglin@bell.net>
      Cc: <stable@vger.kernel.org> # 3.10
      Signed-off-by: NHelge Deller <deller@gmx.de>
      e8d8fc21
    • H
      parisc: optimize mtsp(0,sr) inline assembly · 92b59929
      Helge Deller 提交于
      If the value which should be moved into a space register is zero, we can
      optimize the inline assembly to become "mtsp %r0,%srX".
      Signed-off-by: NHelge Deller <deller@gmx.de>
      Cc: <stable@vger.kernel.org> # 3.10
      92b59929
  6. 29 6月, 2013 2 次提交
  7. 19 6月, 2013 2 次提交
  8. 18 6月, 2013 1 次提交
  9. 01 6月, 2013 1 次提交
    • H
      parisc: fix kernel BUG at arch/parisc/include/asm/mmzone.h:50 · ae249b5f
      Helge Deller 提交于
      With CONFIG_DISCONTIGMEM=y and multiple physical memory areas,
      cat /proc/kpageflags triggers this kernel bug:
      
      kernel BUG at arch/parisc/include/asm/mmzone.h:50!
      CPU: 2 PID: 7848 Comm: cat Tainted: G      D W 3.10.0-rc3-64bit #44
       IAOQ[0]: kpageflags_read0x128/0x238
       IAOQ[1]: kpageflags_read0x12c/0x238
       RP(r2): proc_reg_read0xbc/0x130
      Backtrace:
       [<00000000402ca2d4>] proc_reg_read0xbc/0x130
       [<0000000040235bcc>] vfs_read0xc4/0x1d0
       [<0000000040235f0c>] SyS_read0x94/0xf0
       [<0000000040105fc0>] syscall_exit0x0/0x14
      
      kpageflags_read() walks through the whole memory, even if some memory
      areas are physically not available. So, we should better not BUG on an
      unavailable pfn in pfn_to_nid() but just return the expected value -1 or
      0.
      Signed-off-by: NHelge Deller <deller@gmx.de>
      ae249b5f
  10. 25 5月, 2013 3 次提交
    • H
      parisc: fix irq stack on UP and SMP · d96b51ec
      Helge Deller 提交于
      The logic to detect if the irq stack was already in use with
      raw_spin_trylock() is wrong, because it will generate a "trylock failure
      on UP" error message with CONFIG_SMP=n and CONFIG_DEBUG_SPINLOCK=y.
      
      arch_spin_trylock() can't be used either since in the CONFIG_SMP=n case
      no atomic protection is given and we are reentrant here. A mutex didn't
      worked either and brings more overhead by turning off interrupts.
      
      So, let's use the fastest path for parisc which is the ldcw instruction.
      
      Counting how often the irq stack was used is pretty useless, so just
      drop this piece of code.
      Signed-off-by: NHelge Deller <deller@gmx.de>
      d96b51ec
    • J
      parisc: make interrupt and interruption stack allocation reentrant · b63a2bbc
      John David Anglin 提交于
      The get_stack_use_cr30 and get_stack_use_r30 macros allocate a stack
      frame for external interrupts and interruptions requiring a stack frame.
      They are currently not reentrant in that they save register context
      before the stack is set or adjusted.
      
      I have observed a number of system crashes where there was clear
      evidence of stack corruption during interrupt processing, and as a
      result register corruption. Some interruptions can still occur during
      interruption processing, however external interrupts are disabled and
      data TLB misses don't occur for absolute accesses. So, it's not entirely
      clear what triggers this issue. Also, if an interruption occurs when
      Q=0, it is generally not possible to recover as the shadowed registers
      are not copied.
      
      The attached patch reworks the get_stack_use_cr30 and get_stack_use_r30
      macros to allocate stack before doing register saves. The new code is a
      couple of instructions shorter than the old implementation. Thus, it's
      an improvement even if it doesn't fully resolve the stack corruption
      issue. Based on limited testing, it improves SMP system stability.
      Signed-off-by: NJohn David Anglin <dave.anglin@bell.net>
      Signed-off-by: NHelge Deller <deller@gmx.de>
      b63a2bbc
    • H
      parisc: show number of FPE and unaligned access handler calls in /proc/interrupts · d0c3be80
      Helge Deller 提交于
      Show number of floating point assistant and unaligned access fixup
      handler in /proc/interrupts file.
      Signed-off-by: NHelge Deller <deller@gmx.de>
      d0c3be80
  11. 12 5月, 2013 1 次提交
    • H
      parisc: implement irq stacks - part 2 (v2) · 416821d3
      Helge Deller 提交于
      This patch fixes few build issues which were introduced with the last
      irq stack patch, e.g. the combination of stack overflow check and irq
      stack.
      
      Furthermore we now do proper locking and change the irq bh handler
      to use the irq stack as well.
      
      In /proc/interrupts one now can monitor how huge the irq stack has grown
      and how often it was preferred over the kernel stack.
      
      IRQ stacks are now enabled by default just to make sure that we not
      overflow the kernel stack by accident.
      Signed-off-by: NHelge Deller <deller@gmx.de>
      416821d3
  12. 08 5月, 2013 4 次提交
    • H
      parisc: tlb flush counting fix for SMP and UP · 0fc537d1
      Helge Deller 提交于
      Fix up build error on UP and show correctly number of function call
      (ipi) irqs.
      Signed-off-by: NHelge Deller <deller@gmx.de>
      0fc537d1
    • H
      parisc: more irq statistics in /proc/interrupts · cd85d551
      Helge Deller 提交于
      Add framework and initial values for more fine grained statistics in
      /proc/interrupts.
      Signed-off-by: NHelge Deller <deller@gmx.de>
      cd85d551
    • H
      parisc: implement irq stacks · 200c8804
      Helge Deller 提交于
      Default kernel stack size on parisc is 16k.  During tests we found that the
      kernel stack can easily grow beyond 13k, which leaves 3k left for irq
      processing.
      
      This patch adds the possibility to activate an additional stack of 16k per CPU
      which is being used during irq processing.  This implementation does not yet
      uses this irq stack for the irq bh handler.
      
      The assembler code for call_on_stack was heavily cleaned up by John
      David Anglin.
      
      CC: John David Anglin <dave.anglin@bell.net>
      Signed-off-by: NHelge Deller <deller@gmx.de>
      200c8804
    • H
      parisc: add kernel stack overflow check · 9372450c
      Helge Deller 提交于
      Add the CONFIG_DEBUG_STACKOVERFLOW config option to enable checks to
      detect kernel stack overflows.
      
      Stack overflows can not be detected reliable since we do not want to
      introduce too much overhead.
      
      Instead, during irq processing in do_cpu_irq_mask() we check kernel
      stack usage of the interrupted kernel process. Kernel threads can be
      easily detected by checking the value of space register 7 (sr7) which
      is zero when running inside the kernel.
      
      Since THREAD_SIZE is 16k and PAGE_SIZE is 4k, reduce the alignment of
      the init thread to the lower value (PAGE_SIZE) in the kernel
      vmlinux.ld.S linker script.
      Signed-off-by: NHelge Deller <deller@gmx.de>
      9372450c
  13. 07 5月, 2013 2 次提交
  14. 26 4月, 2013 3 次提交
    • J
      parisc: use spin_lock_irqsave/spin_unlock_irqrestore for PTE updates · bda079d3
      John David Anglin 提交于
      User applications running on SMP kernels have long suffered from instability
      and random segmentation faults.  This patch improves the situation although
      there is more work to be done.
      
      One of the problems is the various routines in pgtable.h that update page table
      entries use different locking mechanisms, or no lock at all (set_pte_at).  This
      change modifies the routines to all use the same lock pa_dbit_lock.  This lock
      is used for dirty bit updates in the interruption code. The patch also purges
      the TLB entries associated with the PTE to ensure that inconsistent values are
      not used after the page table entry is updated.  The UP and SMP code are now
      identical.
      
      The change also includes a minor update to the purge_tlb_entries function in
      cache.c to improve its efficiency.
      Signed-off-by: NJohn David Anglin <dave.anglin@bell.net>
      Cc: Helge Deller <deller@gmx.de>
      Signed-off-by: NHelge Deller <deller@gmx.de>
      bda079d3
    • W
      parisc: uaccess: fix compiler warnings caused by __put_user casting · 0f28b628
      Will Deacon 提交于
      When targetting 32-bit processors, __put_user emits a pair of stw
      instructions for the 8-byte case. If the type of __val is a pointer, the
      marshalling code casts it to the wider integer type of u64, resulting
      in the following compiler warnings:
      
        kernel/signal.c: In function 'copy_siginfo_to_user':
        kernel/signal.c:2752:11: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
        kernel/signal.c:2752:11: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
        [...]
      
      This patch fixes the warnings by removing the marshalling code and using
      the correct output modifiers in the __put_{user,kernel}_asm64 macros
      so that GCC will allocate the right registers without the need to
      extract the two words explicitly.
      
      Cc: Helge Deller <deller@gmx.de>
      Signed-off-by: NWill Deacon <will.deacon@arm.com>
      Signed-off-by: NHelge Deller <deller@gmx.de>
      0f28b628
    • J
      parisc: Change kunmap macro to static inline function · 87be2f88
      John David Anglin 提交于
      Change kunmap macro to static inline function to fix build error
      compiling drivers/base/dma-buf.c.
      
      Without the change, the following error can occur:
      
         CC      drivers/base/dma-buf.o
      drivers/base/dma-buf.c: In function 'dma_buf_kunmap':
      drivers/base/dma-buf.c:427:46:
      error: macro "kunmap" passed 3 arguments, but takes just 1
      
      I believe parisc is the only arch to implement kunmap using a macro.
      Signed-off-by: NJohn David Anglin <dave.anglin@bell.net>
      Cc: "James E.J. Bottomley" <jejb@parisc-linux.org>
      Cc: Helge Deller <deller@gmx.de>
      Signed-off-by: NHelge Deller <deller@gmx.de>
      87be2f88
  15. 08 4月, 2013 1 次提交
  16. 01 4月, 2013 1 次提交
    • K
      net: add option to enable error queue packets waking select · 7d4c04fc
      Keller, Jacob E 提交于
      Currently, when a socket receives something on the error queue it only wakes up
      the socket on select if it is in the "read" list, that is the socket has
      something to read. It is useful also to wake the socket if it is in the error
      list, which would enable software to wait on error queue packets without waking
      up for regular data on the socket. The main use case is for receiving
      timestamped transmit packets which return the timestamp to the socket via the
      error queue. This enables an application to select on the socket for the error
      queue only instead of for the regular traffic.
      
      -v2-
      * Added the SO_SELECT_ERR_QUEUE socket option to every architechture specific file
      * Modified every socket poll function that checks error queue
      Signed-off-by: NJacob Keller <jacob.e.keller@intel.com>
      Cc: Jeffrey Kirsher <jeffrey.t.kirsher@intel.com>
      Cc: Richard Cochran <richardcochran@gmail.com>
      Cc: Matthew Vick <matthew.vick@intel.com>
      Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      7d4c04fc
  17. 04 3月, 2013 1 次提交
  18. 03 3月, 2013 1 次提交
    • H
      parisc: fix compile warnings triggered by atomic_sub(sizeof(),v) · 8527ed4a
      Helge Deller 提交于
      This fixes compile warnings like this one:
      net/ipv4/igmp.c: In function ‘ip_mc_leave_group’:
      net/ipv4/igmp.c:1898:3: warning: overflow in implicit constant conversion [-Woverflow]
      
      atomic_sub() is defined as __atomic_add_return(-(VAL),(v))))
      and if VAL is of type unsigned int (as returned by sizeof()), negating
      this value will overflow. Fix this by type-casting VAL to int type.
      Signed-off-by: NHelge Deller <deller@gmx.de>
      8527ed4a
  19. 21 2月, 2013 11 次提交
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