1. 22 12月, 2008 2 次提交
    • P
      sh: Generic kgdb stub support. · ab6e570b
      Paul Mundt 提交于
      This migrates from the old bitrotted kgdb stub implementation and moves
      to the generic stub. In the process support for SH-2/SH-2A is also added,
      which the old stub never provided.
      Signed-off-by: NPaul Mundt <lethal@linux-sh.org>
      ab6e570b
    • M
      sh: P4 ioremap pass-through · 716777db
      Magnus Damm 提交于
      This patch adds a pass-through case when ioremapping P4 addresses.
      
      Addresses passed to ioremap() should be physical addresses, so the
      best option is usually to convert the virtual address to a physical
      address before calling ioremap. This will give you a virtual address
      in P2 which matches the physical address and this works well for
      most internal hardware blocks on the SuperH architecture.
      
      However, some hardware blocks must be accessed through P4. Converting
      the P4 address to a physical and then back to a P2 does not work. One
      example of this is the sh7722 TMU block, it must be accessed through P4.
      
      Without this patch P4 addresses will be mapped using PTEs which
      requires the page allocator to be up and running.
      Signed-off-by: NMagnus Damm <damm@igel.co.jp>
      Signed-off-by: NPaul Mundt <lethal@linux-sh.org>
      716777db
  2. 21 9月, 2008 3 次提交
    • P
      sh: Trivial trace_mark() instrumentation for core events. · 3d58695e
      Paul Mundt 提交于
      This implements a few trace points across events that are deemed
      interesting. This implements a number of trace points:
      
      	- The page fault handler / TLB miss
      	- IPC calls
      	- Kernel thread creation
      
      The original LTTng patch had the slow-path instrumented, which
      fails to account for the vast majority of events. In general
      placing this in the fast-path is not a huge performance hit, as
      we don't take page faults for kernel addresses.
      
      The other bits of interest are some of the other trap handlers, as
      well as the syscall entry/exit (which is better off being handled
      through the tracehook API). Most of the other trap handlers are corner
      cases where alternate means of notification exist, so there is little
      value in placing extra trace points in these locations.
      
      Based on top of the points provided both by the LTTng instrumentation
      patch as well as the patch shipping in the ST-Linux tree, albeit in a
      stripped down form.
      Signed-off-by: NPaul Mundt <lethal@linux-sh.org>
      3d58695e
    • P
      sh: Kill off duplicate page fault notifiers in slow path. · 8f2baee2
      Paul Mundt 提交于
      We already have hooks in place in the __do_page_fault() fast-path,
      so kill them off in the slow path.
      Signed-off-by: NPaul Mundt <lethal@linux-sh.org>
      8f2baee2
    • P
      887f1ae3
  3. 08 9月, 2008 2 次提交
  4. 28 7月, 2008 1 次提交
  5. 14 2月, 2008 2 次提交
    • H
      sh: Fix multiple UTLB hit on UP SH-4. · a602cc05
      Hideo Saito 提交于
      This acts as a reversion of 1c6b2ca5 in
      the case of UP SH-4, where we still have the risk of a multiple hit
      between the slow and fast paths. As seen on SH7780.
      Signed-off-by: NHideo Saito <saito@densan.co.jp>
      Signed-off-by: NPaul Mundt <lethal@linux-sh.org>
      a602cc05
    • M
      sh: trapped io support V2 · e7cc9a73
      Magnus Damm 提交于
      The idea is that we want to get rid of the in/out/readb/writeb callbacks from
      the machvec and replace that with simple inline read and write operations to
      memory. Fast and simple for most hardware devices (think pci).
      
      Some devices require special treatment though - like 16-bit only CF devices -
      so we need to have some method to hook in callbacks.
      
      This patch makes it possible to add a per-device trap generating filter. This
      way we can get maximum performance of sane hardware - which doesn't need this
      filter - and crappy hardware works but gets punished by a performance hit.
      
      V2 changes things around a bit and replaces io access callbacks with a
      simple minimum_bus_width value. In the future we can add stride as well.
      Signed-off-by: NMagnus Damm <damm@igel.co.jp>
      Signed-off-by: NPaul Mundt <lethal@linux-sh.org>
      e7cc9a73
  6. 28 1月, 2008 2 次提交
  7. 19 11月, 2007 2 次提交
    • P
      sh: lockless UTLB miss fast-path. · 0f1a394b
      Paul Mundt 提交于
      With the refactored update_mmu_cache() introduced in older kernels,
      there's no longer any need to take the page_table_lock in this path,
      so simply drop it completely.
      
      Without this, performance degradation is seen on SMP on heavily
      threaded workloads that don't use the split ptlock, and ultimately
      we have no reason to contend for the lock in the first place.
      Signed-off-by: NPaul Mundt <lethal@linux-sh.org>
      0f1a394b
    • P
      sh: Kill off UTLB flush in fast-path. · 1c6b2ca5
      Paul Mundt 提交于
      The __do_page_fault() fast-path contains a UTLB flush in order to
      force an ITLB reload, this isn't needed in practice as the ITLB is
      auto-reloaded from the UTLB anyways, which is already displaced by
      the manual 'ldtlb' in the update_mmu_cache() path.
      
      This provides a measurable speed up in the TLB miss fast-path.
      Signed-off-by: NPaul Mundt <lethal@linux-sh.org>
      1c6b2ca5
  8. 20 10月, 2007 1 次提交
    • S
      pid namespaces: define is_global_init() and is_container_init() · b460cbc5
      Serge E. Hallyn 提交于
      is_init() is an ambiguous name for the pid==1 check.  Split it into
      is_global_init() and is_container_init().
      
      A cgroup init has it's tsk->pid == 1.
      
      A global init also has it's tsk->pid == 1 and it's active pid namespace
      is the init_pid_ns.  But rather than check the active pid namespace,
      compare the task structure with 'init_pid_ns.child_reaper', which is
      initialized during boot to the /sbin/init process and never changes.
      
      Changelog:
      
      	2.6.22-rc4-mm2-pidns1:
      	- Use 'init_pid_ns.child_reaper' to determine if a given task is the
      	  global init (/sbin/init) process. This would improve performance
      	  and remove dependence on the task_pid().
      
      	2.6.21-mm2-pidns2:
      
      	- [Sukadev Bhattiprolu] Changed is_container_init() calls in {powerpc,
      	  ppc,avr32}/traps.c for the _exception() call to is_global_init().
      	  This way, we kill only the cgroup if the cgroup's init has a
      	  bug rather than force a kernel panic.
      
      [akpm@linux-foundation.org: fix comment]
      [sukadev@us.ibm.com: Use is_global_init() in arch/m32r/mm/fault.c]
      [bunk@stusta.de: kernel/pid.c: remove unused exports]
      [sukadev@us.ibm.com: Fix capability.c to work with threaded init]
      Signed-off-by: NSerge E. Hallyn <serue@us.ibm.com>
      Signed-off-by: NSukadev Bhattiprolu <sukadev@us.ibm.com>
      Acked-by: NPavel Emelianov <xemul@openvz.org>
      Cc: Eric W. Biederman <ebiederm@xmission.com>
      Cc: Cedric Le Goater <clg@fr.ibm.com>
      Cc: Dave Hansen <haveblue@us.ibm.com>
      Cc: Herbert Poetzel <herbert@13thfloor.at>
      Cc: Kirill Korotaev <dev@sw.ru>
      Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      b460cbc5
  9. 17 10月, 2007 1 次提交
    • W
      During VM oom condition, kill all threads in process group · dcca2bde
      Will Schmidt 提交于
      We have had complaints where a threaded application is left in a bad state
      after one of it's threads is killed when we hit a VM: out_of_memory
      condition.
      
      Killing just one of the process threads can leave the application in a bad
      state, whereas killing the entire process group would allow for the
      application to restart, or be otherwise handled, and makes it very obvious
      that something has gone wrong.
      
      This change allows the entire process group to be taken down, rather
      than just the one thread.
      Signed-off-by: NWill Schmidt <will_schmidt@vnet.ibm.com>
      Cc: Richard Henderson <rth@twiddle.net>
      Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
      Cc: Russell King <rmk@arm.linux.org.uk>
      Cc: Ian Molton <spyro@f2s.com>
      Cc: Haavard Skinnemoen <hskinnemoen@atmel.com>
      Cc: Mikael Starvik <starvik@axis.com>
      Cc: David Howells <dhowells@redhat.com>
      Cc: Andi Kleen <ak@suse.de>
      Cc: "Luck, Tony" <tony.luck@intel.com>
      Cc: Hirokazu Takata <takata@linux-m32r.org>
      Cc: Geert Uytterhoeven <geert@linux-m68k.org>
      Cc: Roman Zippel <zippel@linux-m68k.org>
      Cc: Ralf Baechle <ralf@linux-mips.org>
      Cc: Kyle McMartin <kyle@mcmartin.ca>
      Cc: Matthew Wilcox <willy@debian.org>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
      Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
      Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
      Cc: Paul Mundt <lethal@linux-sh.org>
      Cc: Kazumoto Kojima <kkojima@rr.iij4u.or.jp>
      Cc: Richard Curnow <rc@rc0.org.uk>
      Cc: William Lee Irwin III <wli@holomorphy.com>
      Cc: "David S. Miller" <davem@davemloft.net>
      Cc: Chris Zankel <chris@zankel.net>
      Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      dcca2bde
  10. 01 8月, 2007 1 次提交
  11. 20 7月, 2007 1 次提交
    • N
      mm: fault feedback #2 · 83c54070
      Nick Piggin 提交于
      This patch completes Linus's wish that the fault return codes be made into
      bit flags, which I agree makes everything nicer.  This requires requires
      all handle_mm_fault callers to be modified (possibly the modifications
      should go further and do things like fault accounting in handle_mm_fault --
      however that would be for another patch).
      
      [akpm@linux-foundation.org: fix alpha build]
      [akpm@linux-foundation.org: fix s390 build]
      [akpm@linux-foundation.org: fix sparc build]
      [akpm@linux-foundation.org: fix sparc64 build]
      [akpm@linux-foundation.org: fix ia64 build]
      Signed-off-by: NNick Piggin <npiggin@suse.de>
      Cc: Richard Henderson <rth@twiddle.net>
      Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
      Cc: Russell King <rmk@arm.linux.org.uk>
      Cc: Ian Molton <spyro@f2s.com>
      Cc: Bryan Wu <bryan.wu@analog.com>
      Cc: Mikael Starvik <starvik@axis.com>
      Cc: David Howells <dhowells@redhat.com>
      Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
      Cc: "Luck, Tony" <tony.luck@intel.com>
      Cc: Hirokazu Takata <takata@linux-m32r.org>
      Cc: Geert Uytterhoeven <geert@linux-m68k.org>
      Cc: Roman Zippel <zippel@linux-m68k.org>
      Cc: Greg Ungerer <gerg@uclinux.org>
      Cc: Matthew Wilcox <willy@debian.org>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
      Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
      Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
      Cc: Paul Mundt <lethal@linux-sh.org>
      Cc: Kazumoto Kojima <kkojima@rr.iij4u.or.jp>
      Cc: Richard Curnow <rc@rc0.org.uk>
      Cc: William Lee Irwin III <wli@holomorphy.com>
      Cc: "David S. Miller" <davem@davemloft.net>
      Cc: Jeff Dike <jdike@addtoit.com>
      Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
      Cc: Miles Bader <uclinux-v850@lsi.nec.co.jp>
      Cc: Chris Zankel <chris@zankel.net>
      Acked-by: NKyle McMartin <kyle@mcmartin.ca>
      Acked-by: NHaavard Skinnemoen <hskinnemoen@atmel.com>
      Acked-by: NRalf Baechle <ralf@linux-mips.org>
      Acked-by: NAndi Kleen <ak@muc.de>
      Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
      [ Still apparently needs some ARM and PPC loving - Linus ]
      Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      83c54070
  12. 18 6月, 2007 1 次提交
  13. 21 5月, 2007 1 次提交
  14. 14 5月, 2007 1 次提交
  15. 09 5月, 2007 1 次提交
  16. 07 5月, 2007 1 次提交
  17. 14 2月, 2007 1 次提交
  18. 06 12月, 2006 5 次提交
  19. 30 9月, 2006 2 次提交
    • S
      [PATCH] pidspace: is_init() · f400e198
      Sukadev Bhattiprolu 提交于
      This is an updated version of Eric Biederman's is_init() patch.
      (http://lkml.org/lkml/2006/2/6/280).  It applies cleanly to 2.6.18-rc3 and
      replaces a few more instances of ->pid == 1 with is_init().
      
      Further, is_init() checks pid and thus removes dependency on Eric's other
      patches for now.
      
      Eric's original description:
      
      	There are a lot of places in the kernel where we test for init
      	because we give it special properties.  Most  significantly init
      	must not die.  This results in code all over the kernel test
      	->pid == 1.
      
      	Introduce is_init to capture this case.
      
      	With multiple pid spaces for all of the cases affected we are
      	looking for only the first process on the system, not some other
      	process that has pid == 1.
      Signed-off-by: NEric W. Biederman <ebiederm@xmission.com>
      Signed-off-by: NSukadev Bhattiprolu <sukadev@us.ibm.com>
      Cc: Dave Hansen <haveblue@us.ibm.com>
      Cc: Serge Hallyn <serue@us.ibm.com>
      Cc: Cedric Le Goater <clg@fr.ibm.com>
      Cc: <lxc-devel@lists.sourceforge.net>
      Acked-by: NPaul Mackerras <paulus@samba.org>
      Signed-off-by: NAndrew Morton <akpm@osdl.org>
      Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
      f400e198
    • J
      [PATCH] make PROT_WRITE imply PROT_READ · df67b3da
      Jason Baron 提交于
      Make PROT_WRITE imply PROT_READ for a number of architectures which don't
      support write only in hardware.
      
      While looking at this, I noticed that some architectures which do not
      support write only mappings already take the exact same approach.  For
      example, in arch/alpha/mm/fault.c:
      
      "
              if (cause < 0) {
                      if (!(vma->vm_flags & VM_EXEC))
                              goto bad_area;
              } else if (!cause) {
                      /* Allow reads even for write-only mappings */
                      if (!(vma->vm_flags & (VM_READ | VM_WRITE)))
                              goto bad_area;
              } else {
                      if (!(vma->vm_flags & VM_WRITE))
                              goto bad_area;
              }
      "
      
      Thus, this patch brings other architectures which do not support write only
      mappings in-line and consistent with the rest.  I've verified the patch on
      ia64, x86_64 and x86.
      
      Additional discussion:
      
      Several architectures, including x86, can not support write-only mappings.
      The pte for x86 reserves a single bit for protection and its two states are
      read only or read/write.  Thus, write only is not supported in h/w.
      
      Currently, if i 'mmap' a page write-only, the first read attempt on that page
      creates a page fault and will SEGV.  That check is enforced in
      arch/blah/mm/fault.c.  However, if i first write that page it will fault in
      and the pte will be set to read/write.  Thus, any subsequent reads to the page
      will succeed.  It is this inconsistency in behavior that this patch is
      attempting to address.  Furthermore, if the page is swapped out, and then
      brought back the first read will also cause a SEGV.  Thus, any arbitrary read
      on a page can potentially result in a SEGV.
      
      According to the SuSv3 spec, "if the application requests only PROT_WRITE, the
      implementation may also allow read access." Also as mentioned, some
      archtectures, such as alpha, shown above already take the approach that i am
      suggesting.
      
      The counter-argument to this raised by Arjan, is that the kernel is enforcing
      the write only mapping the best it can given the h/w limitations.  This is
      true, however Alan Cox, and myself would argue that the inconsitency in
      behavior, that is applications can sometimes work/sometimes fails is highly
      undesireable.  If you read through the thread, i think people, came to an
      agreement on the last patch i posted, as nobody has objected to it...
      Signed-off-by: NJason Baron <jbaron@redhat.com>
      Cc: Russell King <rmk@arm.linux.org.uk>
      Cc: "Luck, Tony" <tony.luck@intel.com>
      Cc: Hugh Dickins <hugh@veritas.com>
      Cc: Roman Zippel <zippel@linux-m68k.org>
      Cc: Geert Uytterhoeven <geert@linux-m68k.org>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
      Acked-by: NAndi Kleen <ak@muc.de>
      Acked-by: NAlan Cox <alan@lxorguk.ukuu.org.uk>
      Cc: Arjan van de Ven <arjan@linux.intel.com>
      Acked-by: NPaul Mundt <lethal@linux-sh.org>
      Cc: Kazumoto Kojima <kkojima@rr.iij4u.or.jp>
      Cc: Ian Molton <spyro@f2s.com>
      Signed-off-by: NAndrew Morton <akpm@osdl.org>
      Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
      df67b3da
  20. 27 9月, 2006 4 次提交
    • P
      sh: More cosmetic cleanups and trivial fixes. · 0f08f338
      Paul Mundt 提交于
      Nothing exciting here, just trivial fixes..
      Signed-off-by: NPaul Mundt <lethal@linux-sh.org>
      0f08f338
    • P
      sh: Fix split ptlock for user mappings in __do_page_fault(). · f647d33f
      Paul Mundt 提交于
      There was a bug that got introduced when the split ptlock changes
      went in where mm could be unintialized for user mappings, this
      fixes it up..
      Signed-off-by: NPaul Mundt <lethal@linux-sh.org>
      f647d33f
    • P
      sh: page table alloc cleanups and page fault optimizations. · 26ff6c11
      Paul Mundt 提交于
      Cleanup of page table allocators, using generic folded PMD and PUD
      helpers. TLB flushing operations are moved to a more sensible spot.
      
      The page fault handler is also optimized slightly, we no longer waste
      cycles on IRQ disabling for flushing of the page from the ITLB, since
      we're already under CLI protection by the initial exception handler.
      Signed-off-by: NPaul Mundt <lethal@linux-sh.org>
      26ff6c11
    • P
      sh: Add control register barriers. · 29847622
      Paul Mundt 提交于
      Currently when making changes to control registers, we
      typically need some time for changes to take effect (8
      nops, generally).  However, for sh4a we simply need to
      do an icbi..
      
      This is a simple patch for implementing a general purpose
      ctrl_barrier() which functions as a control register write
      barrier. There's some additional documentation in the patch
      itself, but it's pretty self explanatory.
      
      There were also some places where we were not doing the
      barrier, which didn't seem to have any adverse effects on
      legacy parts, but certainly did on sh4a. It's safer to have
      the barrier in place for legacy parts as well in these cases,
      though this does make flush_tlb_all() more expensive (by an
      order of 8 nops).  We can ifdef around the flush_tlb_all()
      case for now if it's clear that all legacy parts won't have
      a problem with this.
      Signed-off-by: NPaul Mundt <lethal@linux-sh.org>
      29847622
  21. 30 10月, 2005 1 次提交
    • H
      [PATCH] mm: i386 sh sh64 ready for split ptlock · 60ec5585
      Hugh Dickins 提交于
      Use pte_offset_map_lock, instead of pte_offset_map (or inappropriate
      pte_offset_kernel) and mm-wide page_table_lock, in sundry arch places.
      
      The i386 vm86 mark_screen_rdonly: yes, there was and is an assumption that the
      screen fits inside the one page table, as indeed it does.
      
      The sh __do_page_fault: which handles both kernel faults (without lock) and
      user mm faults (locked - though it set_pte without locking before).
      
      The sh64 flush_cache_range and helpers: which wrongly thought callers held
      page_table_lock before (only its tlb_start_vma did, and no longer does so);
      moved the flush loop down, and adjusted the large versus small range decision
      to consider a range which spans page tables as large.
      Signed-off-by: NHugh Dickins <hugh@veritas.com>
      Acked-by: NPaul Mundt <lethal@linux-sh.org>
      Signed-off-by: NAndrew Morton <akpm@osdl.org>
      Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
      60ec5585
  22. 17 4月, 2005 1 次提交
    • L
      Linux-2.6.12-rc2 · 1da177e4
      Linus Torvalds 提交于
      Initial git repository build. I'm not bothering with the full history,
      even though we have it. We can create a separate "historical" git
      archive of that later if we want to, and in the meantime it's about
      3.2GB when imported into git - space that would just make the early
      git days unnecessarily complicated, when we don't have a lot of good
      infrastructure for it.
      
      Let it rip!
      1da177e4