1. 08 May, 2007 2 commits
  2. 02 May, 2007 1 commit
  3. 14 Feb, 2007 7 commits
  4. 12 Feb, 2007 1 commit
  5. 11 Feb, 2007 1 commit
  6. 10 Dec, 2006 1 commit
  7. 07 Dec, 2006 4 commits
  8. 27 Oct, 2006 1 commit
  9. 05 Oct, 2006 1 commit
    • David Howells's avatar
      IRQ: Maintain regs pointer globally rather than passing to IRQ handlers · 7d12e780
      David Howells authored
      
      
      Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
      of passing regs around manually through all ~1800 interrupt handlers in the
      Linux kernel.
      
      The regs pointer is used in few places, but it potentially costs both stack
      space and code to pass it around.  On the FRV arch, removing the regs parameter
      from all the genirq function results in a 20% speed up of the IRQ exit path
      (ie: from leaving timer_interrupt() to leaving do_IRQ()).
      
      Where appropriate, an arch may override the generic storage facility and do
      something different with the variable.  On FRV, for instance, the address is
      maintained in GR28 at all times inside the kernel as part of general exception
      handling.
      
      Having looked over the code, it appears that the parameter may be handed down
      through up to twenty or so layers of functions.  Consider a USB character
      device attached to a USB hub, attached to a USB controller that posts its
      interrupts through a cascaded auxiliary interrupt controller.  A character
      device driver may want to pass regs to the sysrq handler through the input
      layer which adds another few layers of parameter passing.
      
      I've build this code with allyesconfig for x86_64 and i386.  I've runtested the
      main part of the code on FRV and i386, though I can't test most of the drivers.
      I've also done partial conversion for powerpc and MIPS - these at least compile
      with minimal configurations.
      
      This will affect all archs.  Mostly the changes should be relatively easy.
      Take do_IRQ(), store the regs pointer at the beginning, saving the old one:
      
      	struct pt_regs *old_regs = set_irq_regs(regs);
      
      And put the old one back at the end:
      
      	set_irq_regs(old_regs);
      
      Don't pass regs through to generic_handle_irq() or __do_IRQ().
      
      In timer_interrupt(), this sort of change will be necessary:
      
      	-	update_process_times(user_mode(regs));
      	-	profile_tick(CPU_PROFILING, regs);
      	+	update_process_times(user_mode(get_irq_regs()));
      	+	profile_tick(CPU_PROFILING);
      
      I'd like to move update_process_times()'s use of get_irq_regs() into itself,
      except that i386, alone of the archs, uses something other than user_mode().
      
      Some notes on the interrupt handling in the drivers:
      
       (*) input_dev() is now gone entirely.  The regs pointer is no longer stored in
           the input_dev struct.
      
       (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking.  It does
           something different depending on whether it's been supplied with a regs
           pointer or not.
      
       (*) Various IRQ handler function pointers have been moved to type
           irq_handler_t.
      Signed-Off-By: default avatarDavid Howells <dhowells@redhat.com>
      (cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
      7d12e780
  10. 04 Oct, 2006 1 commit
  11. 02 Oct, 2006 3 commits
    • Arnd Bergmann's avatar
      [PATCH] provide kernel_execve on all architectures · fe74290d
      Arnd Bergmann authored
      
      
      This adds the new kernel_execve function on all architectures that were using
      _syscall3() to implement execve.
      
      The implementation uses code from the _syscall3 macros provided in the
      unistd.h header file.  I don't have cross-compilers for any of these
      architectures, so the patch is untested with the exception of i386.
      
      Most architectures can probably implement this in a nicer way in assembly or
      by combining it with the sys_execve implementation itself, but this should do
      it for now.
      
      [bunk@stusta.de: m68knommu build fix]
      [markh@osdl.org: build fix]
      [bero@arklinux.org: build fix]
      [ralf@linux-mips.org: mips fix]
      [schwidefsky@de.ibm.com: s390 fix]
      Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
      Cc: Andi Kleen <ak@muc.de>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
      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: Mikael Starvik <starvik@axis.com>
      Cc: David Howells <dhowells@redhat.com>
      Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
      Cc: Hirokazu Takata <takata.hirokazu@renesas.com>
      Cc: Ralf Baechle <ralf@linux-mips.org>
      Cc: Kyle McMartin <kyle@mcmartin.ca>
      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>
      Cc: "Luck, Tony" <tony.luck@intel.com>
      Cc: Geert Uytterhoeven <geert@linux-m68k.org>
      Cc: Roman Zippel <zippel@linux-m68k.org>
      Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
      Signed-off-by: default avatarBernhard Rosenkraenzer <bero@arklinux.org>
      Signed-off-by: default avatarMark Haverkamp <markh@osdl.org>
      Signed-off-by: default avatarAdrian Bunk <bunk@stusta.de>
      Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      fe74290d
    • Serge E. Hallyn's avatar
      [PATCH] nsproxy: move init_nsproxy into kernel/nsproxy.c · 0437eb59
      Serge E. Hallyn authored
      
      
      Move the init_nsproxy definition out of arch/ into kernel/nsproxy.c.  This
      avoids all arches having to be updated.  Compiles and boots on s390.
      Signed-off-by: default avatarSerge E. Hallyn <serue@us.ibm.com>
      Cc: Kirill Korotaev <dev@openvz.org>
      Cc: "Eric W. Biederman" <ebiederm@xmission.com>
      Cc: Herbert Poetzl <herbert@13thfloor.at>
      Cc: Andrey Savochkin <saw@sw.ru>
      Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      0437eb59
    • Serge E. Hallyn's avatar
      [PATCH] namespaces: add nsproxy · ab516013
      Serge E. Hallyn authored
      
      
      This patch adds a nsproxy structure to the task struct.  Later patches will
      move the fs namespace pointer into this structure, and introduce a new utsname
      namespace into the nsproxy.
      
      The vserver and openvz functionality, then, would be implemented in large part
      by virtualizing/isolating more and more resources into namespaces, each
      contained in the nsproxy.
      
      [akpm@osdl.org: build fix]
      Signed-off-by: default avatarSerge Hallyn <serue@us.ibm.com>
      Cc: Kirill Korotaev <dev@openvz.org>
      Cc: "Eric W. Biederman" <ebiederm@xmission.com>
      Cc: Herbert Poetzl <herbert@13thfloor.at>
      Cc: Andrey Savochkin <saw@sw.ru>
      Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      ab516013
  12. 01 Oct, 2006 1 commit
  13. 29 Sep, 2006 1 commit
    • Atsushi Nemoto's avatar
      [PATCH] simplify update_times (avoid jiffies/jiffies_64 aliasing problem) · 3171a030
      Atsushi Nemoto authored
      Pass ticks to do_timer() and update_times(), and adjust x86_64 and s390
      timer interrupt handler with this change.
      
      Currently update_times() calculates ticks by "jiffies - wall_jiffies", but
      callers of do_timer() should know how many ticks to update.  Passing ticks
      get rid of this redundant calculation.  Also there are another redundancy
      pointed out by Martin Schwidefsky.
      
      This cleanup make a barrier added by
      5aee405c
      
       needless.  So this patch removes
      it.
      
      As a bonus, this cleanup make wall_jiffies can be removed easily, since now
      wall_jiffies is always synced with jiffies.  (This patch does not really
      remove wall_jiffies.  It would be another cleanup patch)
      Signed-off-by: default avatarAtsushi Nemoto <anemo@mba.ocn.ne.jp>
      Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
      Cc: "Eric W. Biederman" <ebiederm@xmission.com>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: Ingo Molnar <mingo@elte.hu>
      Cc: john stultz <johnstul@us.ibm.com>
      Cc: Andi Kleen <ak@muc.de>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
      Cc: Richard Henderson <rth@twiddle.net>
      Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
      Acked-by: default avatarRussell King <rmk@arm.linux.org.uk>
      Cc: Ian Molton <spyro@f2s.com>
      Cc: Mikael Starvik <starvik@axis.com>
      Acked-by: default avatarDavid Howells <dhowells@redhat.com>
      Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
      Cc: Hirokazu Takata <takata.hirokazu@renesas.com>
      Acked-by: default avatarRalf Baechle <ralf@linux-mips.org>
      Cc: Kyle McMartin <kyle@mcmartin.ca>
      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: default avatar"Luck, Tony" <tony.luck@intel.com>
      Cc: Geert Uytterhoeven <geert@linux-m68k.org>
      Cc: Roman Zippel <zippel@linux-m68k.org>
      Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      3171a030
  14. 26 Sep, 2006 2 commits
  15. 06 Sep, 2006 1 commit
  16. 10 Jul, 2006 3 commits
  17. 03 Jul, 2006 1 commit
    • Sam Ravnborg's avatar
      kbuild: introduce utsrelease.h · 63104eec
      Sam Ravnborg authored
      
      
      include/linux/version.h contained both actual KERNEL version
      and UTS_RELEASE that contains a subset from git SHA1 for when
      kernel was compiled as part of a git repository.
      This had the unfortunate side-effect that all files including version.h
      would be recompiled when some git changes was made due to changes SHA1.
      Split it out so we keep independent parts in separate files.
      
      Also update checkversion.pl script to no longer check for UTS_RELEASE.
      Signed-off-by: default avatarSam Ravnborg <sam@ravnborg.org>
      63104eec
  18. 02 Jul, 2006 1 commit
  19. 30 Jun, 2006 1 commit
  20. 23 Jun, 2006 6 commits