1. 12 Dec, 2009 1 commit
  2. 11 Dec, 2009 2 commits
  3. 26 Nov, 2009 1 commit
    • Ilya Loginov's avatar
      block: add helpers to run flush_dcache_page() against a bio and a request's pages · 2d4dc890
      Ilya Loginov authored
      
      
      Mtdblock driver doesn't call flush_dcache_page for pages in request.  So,
      this causes problems on architectures where the icache doesn't fill from
      the dcache or with dcache aliases.  The patch fixes this.
      
      The ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE symbol was introduced to avoid
      pointless empty cache-thrashing loops on architectures for which
      flush_dcache_page() is a no-op.  Every architecture was provided with this
      flush pages on architectires where ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE is
      equal 1 or do nothing otherwise.
      
      See "fix mtd_blkdevs problem with caches on some architectures" discussion
      on LKML for more information.
      Signed-off-by: default avatarIlya Loginov <isloginov@gmail.com>
      Cc: Ingo Molnar <mingo@elte.hu>
      Cc: David Woodhouse <dwmw2@infradead.org>
      Cc: Peter Horton <phorton@bitbox.co.uk>
      Cc: "Ed L. Cashin" <ecashin@coraid.com>
      Signed-off-by: default avatarJens Axboe <jens.axboe@oracle.com>
      2d4dc890
  4. 14 Oct, 2009 1 commit
  5. 12 Oct, 2009 1 commit
    • Neil Horman's avatar
      net: Generalize socket rx gap / receive queue overflow cmsg · 3b885787
      Neil Horman authored
      Create a new socket level option to report number of queue overflows
      
      Recently I augmented the AF_PACKET protocol to report the number of frames lost
      on the socket receive queue between any two enqueued frames.  This value was
      exported via a SOL_PACKET level cmsg.  AFter I completed that work it was
      requested that this feature be generalized so that any datagram oriented socket
      could make use of this option.  As such I've created this patch, It creates a
      new SOL_SOCKET level option called SO_RXQ_OVFL, which when enabled exports a
      SOL_SOCKET level cmsg that reports the nubmer of times the sk_receive_queue
      overflowed between any two given frames.  It also augments the AF_PACKET
      protocol to take advantage of this new feature (as it previously did not touch
      sk->sk_drops, which this patch uses to record the overflow count).  Tested
      successfully by me.
      
      Notes:
      
      1) Unlike my previous patch, this patch simply records the sk_drops value, which
      is not a number of drops between packets, but rather a total number of drops.
      Deltas must be computed in user space.
      
      2) While this patch currently works with datagram oriented protocols, it will
      also be accepted by non-datagram oriented protocols. I'm not sure if thats
      agreeable to everyone, but my argument in favor of doing so is that, for those
      protocols which aren't applicable to this option, sk_drops will always be zero,
      and reporting no drops on a receive queue that isn't used for those
      non-participating protocols seems reasonable to me.  This also saves us having
      to code in a per-protocol opt in mechanism.
      
      3) This applies cleanly to net-next assuming that commit
      97775007
      
       (my af packet cmsg patch) is reverted
      Signed-off-by: default avatarNeil Horman <nhorman@tuxdriver.com>
      Signed-off-by: default avatarEric Dumazet <eric.dumazet@gmail.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      3b885787
  6. 01 Oct, 2009 1 commit
    • Mark Salter's avatar
      mn10300: fix kernel build failures when using gcc-4.x · d22a001b
      Mark Salter authored
      
      
      Fix some build failures when using gcc-4.x for MN10300.
      
      Firstly, __get_user() fails to build because the pointer points to a const and
      __gu_val ends up being read-only:
      
      In file included from include/linux/mempolicy.h:62,
                       from init/main.c:50:
      include/linux/pagemap.h: In function 'fault_in_pages_readable':
      include/linux/pagemap.h:394: error: read-only variable '__gu_val' used as 'asm' output
      include/linux/pagemap.h:394: error: read-only variable '__gu_val' used as 'asm' output
      include/linux/pagemap.h:394: error: read-only variable '__gu_val' used as 'asm' output
      include/linux/pagemap.h:400: error: read-only variable '__gu_val' used as 'asm' output
      include/linux/pagemap.h:400: error: read-only variable '__gu_val' used as 'asm' output
      include/linux/pagemap.h:400: error: read-only variable '__gu_val' used as 'asm' output
      make[1]: *** [init/main.o] Error 1
      
      Secondly, gcc-4 doesn't allow casts of lvalues:
      
        UPD     include/linux/compile.h
      arch/mn10300/kernel/rtc.c: In function 'calibrate_clock':
      arch/mn10300/kernel/rtc.c:170: error: lvalue required as left operand of assignment
      arch/mn10300/kernel/rtc.c:172: error: lvalue required as left operand of assignment
      make[1]: *** [arch/mn10300/kernel/rtc.o] Error 1
      
      These are seen with gcc 4.2.1.
      Signed-off-by: default avatarMark Salter <msalter@redhat.com>
      Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      d22a001b
  7. 25 Sep, 2009 1 commit
  8. 24 Sep, 2009 2 commits
  9. 23 Sep, 2009 3 commits
  10. 22 Sep, 2009 3 commits
  11. 21 Sep, 2009 3 commits
    • Uwe Kleine-Koenig's avatar
    • Ingo Molnar's avatar
      perf: Do the big rename: Performance Counters -> Performance Events · cdd6c482
      Ingo Molnar authored
      
      
      Bye-bye Performance Counters, welcome Performance Events!
      
      In the past few months the perfcounters subsystem has grown out its
      initial role of counting hardware events, and has become (and is
      becoming) a much broader generic event enumeration, reporting, logging,
      monitoring, analysis facility.
      
      Naming its core object 'perf_counter' and naming the subsystem
      'perfcounters' has become more and more of a misnomer. With pending
      code like hw-breakpoints support the 'counter' name is less and
      less appropriate.
      
      All in one, we've decided to rename the subsystem to 'performance
      events' and to propagate this rename through all fields, variables
      and API names. (in an ABI compatible fashion)
      
      The word 'event' is also a bit shorter than 'counter' - which makes
      it slightly more convenient to write/handle as well.
      
      Thanks goes to Stephane Eranian who first observed this misnomer and
      suggested a rename.
      
      User-space tooling and ABI compatibility is not affected - this patch
      should be function-invariant. (Also, defconfigs were not touched to
      keep the size down.)
      
      This patch has been generated via the following script:
      
        FILES=$(find * -type f | grep -vE 'oprofile|[^K]config')
      
        sed -i \
          -e 's/PERF_EVENT_/PERF_RECORD_/g' \
          -e 's/PERF_COUNTER/PERF_EVENT/g' \
          -e 's/perf_counter/perf_event/g' \
          -e 's/nb_counters/nb_events/g' \
          -e 's/swcounter/swevent/g' \
          -e 's/tpcounter_event/tp_event/g' \
          $FILES
      
        for N in $(find . -name perf_counter.[ch]); do
          M=$(echo $N | sed 's/perf_counter/perf_event/g')
          mv $N $M
        done
      
        FILES=$(find . -name perf_event.*)
      
        sed -i \
          -e 's/COUNTER_MASK/REG_MASK/g' \
          -e 's/COUNTER/EVENT/g' \
          -e 's/\<event\>/event_id/g' \
          -e 's/counter/event/g' \
          -e 's/Counter/Event/g' \
          $FILES
      
      ... to keep it as correct as possible. This script can also be
      used by anyone who has pending perfcounters patches - it converts
      a Linux kernel tree over to the new naming. We tried to time this
      change to the point in time where the amount of pending patches
      is the smallest: the end of the merge window.
      
      Namespace clashes were fixed up in a preparatory patch - and some
      stylistic fallout will be fixed up in a subsequent patch.
      
      ( NOTE: 'counters' are still the proper terminology when we deal
        with hardware registers - and these sed scripts are a bit
        over-eager in renaming them. I've undone some of that, but
        in case there's something left where 'counter' would be
        better than 'event' we can undo that on an individual basis
        instead of touching an otherwise nicely automated patch. )
      Suggested-by: default avatarStephane Eranian <eranian@google.com>
      Acked-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
      Acked-by: default avatarPaul Mackerras <paulus@samba.org>
      Reviewed-by: default avatarArjan van de Ven <arjan@linux.intel.com>
      Cc: Mike Galbraith <efault@gmx.de>
      Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Cc: Steven Rostedt <rostedt@goodmis.org>
      Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
      Cc: David Howells <dhowells@redhat.com>
      Cc: Kyle McMartin <kyle@mcmartin.ca>
      Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
      Cc: "David S. Miller" <davem@davemloft.net>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: "H. Peter Anvin" <hpa@zytor.com>
      Cc: <linux-arch@vger.kernel.org>
      LKML-Reference: <new-submission>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      cdd6c482
    • Joe Perches's avatar
  12. 19 Sep, 2009 1 commit
  13. 09 Sep, 2009 1 commit
  14. 02 Sep, 2009 1 commit
    • David Howells's avatar
      KEYS: Add a keyctl to install a process's session keyring on its parent [try #6] · ee18d64c
      David Howells authored
      
      
      Add a keyctl to install a process's session keyring onto its parent.  This
      replaces the parent's session keyring.  Because the COW credential code does
      not permit one process to change another process's credentials directly, the
      change is deferred until userspace next starts executing again.  Normally this
      will be after a wait*() syscall.
      
      To support this, three new security hooks have been provided:
      cred_alloc_blank() to allocate unset security creds, cred_transfer() to fill in
      the blank security creds and key_session_to_parent() - which asks the LSM if
      the process may replace its parent's session keyring.
      
      The replacement may only happen if the process has the same ownership details
      as its parent, and the process has LINK permission on the session keyring, and
      the session keyring is owned by the process, and the LSM permits it.
      
      Note that this requires alteration to each architecture's notify_resume path.
      This has been done for all arches barring blackfin, m68k* and xtensa, all of
      which need assembly alteration to support TIF_NOTIFY_RESUME.  This allows the
      replacement to be performed at the point the parent process resumes userspace
      execution.
      
      This allows the userspace AFS pioctl emulation to fully emulate newpag() and
      the VIOCSETTOK and VIOCSETTOK2 pioctls, all of which require the ability to
      alter the parent process's PAG membership.  However, since kAFS doesn't use
      PAGs per se, but rather dumps the keys into the session keyring, the session
      keyring of the parent must be replaced if, for example, VIOCSETTOK is passed
      the newpag flag.
      
      This can be tested with the following program:
      
      	#include <stdio.h>
      	#include <stdlib.h>
      	#include <keyutils.h>
      
      	#define KEYCTL_SESSION_TO_PARENT	18
      
      	#define OSERROR(X, S) do { if ((long)(X) == -1) { perror(S); exit(1); } } while(0)
      
      	int main(int argc, char **argv)
      	{
      		key_serial_t keyring, key;
      		long ret;
      
      		keyring = keyctl_join_session_keyring(argv[1]);
      		OSERROR(keyring, "keyctl_join_session_keyring");
      
      		key = add_key("user", "a", "b", 1, keyring);
      		OSERROR(key, "add_key");
      
      		ret = keyctl(KEYCTL_SESSION_TO_PARENT);
      		OSERROR(ret, "KEYCTL_SESSION_TO_PARENT");
      
      		return 0;
      	}
      
      Compiled and linked with -lkeyutils, you should see something like:
      
      	[dhowells@andromeda ~]$ keyctl show
      	Session Keyring
      	       -3 --alswrv   4043  4043  keyring: _ses
      	355907932 --alswrv   4043    -1   \_ keyring: _uid.4043
      	[dhowells@andromeda ~]$ /tmp/newpag
      	[dhowells@andromeda ~]$ keyctl show
      	Session Keyring
      	       -3 --alswrv   4043  4043  keyring: _ses
      	1055658746 --alswrv   4043  4043   \_ user: a
      	[dhowells@andromeda ~]$ /tmp/newpag hello
      	[dhowells@andromeda ~]$ keyctl show
      	Session Keyring
      	       -3 --alswrv   4043  4043  keyring: hello
      	340417692 --alswrv   4043  4043   \_ user: a
      
      Where the test program creates a new session keyring, sticks a user key named
      'a' into it and then installs it on its parent.
      Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
      Signed-off-by: default avatarJames Morris <jmorris@namei.org>
      ee18d64c
  15. 10 Aug, 2009 1 commit
  16. 05 Aug, 2009 2 commits
    • Jan Engelhardt's avatar
      net: implement a SO_DOMAIN getsockoption · 0d6038ee
      Jan Engelhardt authored
      
      
      This sockopt goes in line with SO_TYPE and SO_PROTOCOL. It makes it
      possible for userspace programs to pass around file descriptors — I
      am referring to arguments-to-functions, but it may even work for the
      fd passing over UNIX sockets — without needing to also pass the
      auxiliary information (PF_INET6/IPPROTO_TCP).
      Signed-off-by: default avatarJan Engelhardt <jengelh@medozas.de>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      0d6038ee
    • Jan Engelhardt's avatar
      net: implement a SO_PROTOCOL getsockoption · 49c794e9
      Jan Engelhardt authored
      
      
      Similar to SO_TYPE returning the socket type, SO_PROTOCOL allows to
      retrieve the protocol used with a given socket.
      
      I am not quite sure why we have that-many copies of socket.h, and why
      the values are not the same on all arches either, but for where hex
      numbers dominate, I use 0x1029 for SO_PROTOCOL as that seems to be
      the next free unused number across a bunch of operating systems, or
      so Google results make me want to believe. SO_PROTOCOL for others
      just uses the next free Linux number, 38.
      Signed-off-by: default avatarJan Engelhardt <jengelh@medozas.de>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      49c794e9
  17. 27 Jul, 2009 1 commit
    • Benjamin Herrenschmidt's avatar
      mm: Pass virtual address to [__]p{te,ud,md}_free_tlb() · 9e1b32ca
      Benjamin Herrenschmidt authored
      
      
      mm: Pass virtual address to [__]p{te,ud,md}_free_tlb()
      
      Upcoming paches to support the new 64-bit "BookE" powerpc architecture
      will need to have the virtual address corresponding to PTE page when
      freeing it, due to the way the HW table walker works.
      
      Basically, the TLB can be loaded with "large" pages that cover the whole
      virtual space (well, sort-of, half of it actually) represented by a PTE
      page, and which contain an "indirect" bit indicating that this TLB entry
      RPN points to an array of PTEs from which the TLB can then create direct
      entries. Thus, in order to invalidate those when PTE pages are deleted,
      we need the virtual address to pass to tlbilx or tlbivax instructions.
      
      The old trick of sticking it somewhere in the PTE page struct page sucks
      too much, the address is almost readily available in all call sites and
      almost everybody implemets these as macros, so we may as well add the
      argument everywhere. I added it to the pmd and pud variants for consistency.
      Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
      Acked-by: David Howells <dhowells@redhat.com> [MN10300 & FRV]
      Acked-by: default avatarNick Piggin <npiggin@suse.de>
      Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com> [s390]
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      9e1b32ca
  18. 17 Jul, 2009 1 commit
    • Tim Abbott's avatar
      vmlinux.lds.h: restructure BSS linker script macros · 04e448d9
      Tim Abbott authored
      
      
      The BSS section macros in vmlinux.lds.h currently place the .sbss
      input section outside the bounds of [__bss_start, __bss_end].  On all
      architectures except for microblaze that handle both .sbss and
      __bss_start/__bss_end, this is wrong: the .sbss input section is
      within the range [__bss_start, __bss_end].  Relatedly, the example
      code at the top of the file actually has __bss_start/__bss_end defined
      twice; I believe the right fix here is to define them in the
      BSS_SECTION macro but not in the BSS macro.
      
      Another problem with the current macros is that several
      architectures have an ALIGN(4) or some other small number just before
      __bss_stop in their linker scripts.  The BSS_SECTION macro currently
      hardcodes this to 4; while it should really be an argument.  It also
      ignores its sbss_align argument; fix that.
      
      mn10300 is the only user at present of any of the macros touched by
      this patch.  It looks like mn10300 actually was incorrectly converted
      to use the new BSS() macro (the alignment of 4 prior to conversion was
      a __bss_stop alignment, but the argument to the BSS macro is a start
      alignment).  So fix this as well.
      
      I'd like acks from Sam and David on this one.  Also CCing Paul, since
      he has a patch from me which will need to be updated to use
      BSS_SECTION(0, PAGE_SIZE, 4) once this gets merged.
      Signed-off-by: default avatarTim Abbott <tabbott@ksplice.com>
      Cc: Paul Mundt <lethal@linux-sh.org>
      Cc: David Howells <dhowells@redhat.com>
      Signed-off-by: default avatarSam Ravnborg <sam@ravnborg.org>
      04e448d9
  19. 13 Jul, 2009 1 commit
  20. 12 Jul, 2009 1 commit
  21. 10 Jul, 2009 1 commit
  22. 09 Jul, 2009 1 commit
    • Tejun Heo's avatar
      linker script: unify usage of discard definition · 023bf6f1
      Tejun Heo authored
      
      
      Discarded sections in different archs share some commonality but have
      considerable differences.  This led to linker script for each arch
      implementing its own /DISCARD/ definition, which makes maintaining
      tedious and adding new entries error-prone.
      
      This patch makes all linker scripts to move discard definitions to the
      end of the linker script and use the common DISCARDS macro.  As ld
      uses the first matching section definition, archs can include default
      discarded sections by including them earlier in the linker script.
      
      ia64 is notable because it first throws away some ia64 specific
      subsections and then include the rest of the sections into the final
      image, so those sections must be discarded before the inclusion.
      
      defconfig compile tested for x86, x86-64, powerpc, powerpc64, ia64,
      alpha, sparc, sparc64 and s390.  Michal Simek tested microblaze.
      Signed-off-by: default avatarTejun Heo <tj@kernel.org>
      Acked-by: default avatarPaul Mundt <lethal@linux-sh.org>
      Acked-by: default avatarMike Frysinger <vapier@gentoo.org>
      Tested-by: Michal Simek's avatarMichal Simek <monstr@monstr.eu>
      Cc: linux-arch@vger.kernel.org
      Cc: Michal Simek <monstr@monstr.eu>
      Cc: microblaze-uclinux@itee.uq.edu.au
      Cc: Sam Ravnborg <sam@ravnborg.org>
      Cc: Tony Luck <tony.luck@intel.com>
      023bf6f1
  23. 08 Jul, 2009 1 commit
  24. 01 Jul, 2009 1 commit
  25. 29 Jun, 2009 1 commit
  26. 26 Jun, 2009 1 commit
    • Tim Abbott's avatar
      asm-generic/vmlinux.lds.h: shuffle INIT_TASK* macro names in vmlinux.lds.h · 39a449d9
      Tim Abbott authored
      
      
      We recently added a INIT_TASK(align) in include/asm-generic/vmlinux.lds.h,
      but there is already a macro INIT_TASK in include/linux/init_task.h, which
      is quite confusing.  We should switch the macro in the linker script to
      INIT_TASK_DATA. (Sorry that I missed this in reviewing the patch).  Since
      the macros are new, there is only one user of the INIT_TASK in
      vmlinux.lds.h, arch/mn10300/kernel/vmlinux.lds.S.
      
      However, we are currently using INIT_TASK_DATA for laying down an entire
      .data.init_task section.  So rename that to INIT_TASK_DATA_SECTION.
      
      I would be worried about changing the meaning of INIT_TASK_DATA, but the
      old INIT_TASK_DATA implementation had no users, and in fact if anyone had
      tried to use it, it would have failed to compile because it didn't pass
      the alignment to the old INIT_TASK.
      Signed-off-by: default avatarTim Abbott <tabbott@ksplice.com>
      Cc: David Howells <dhowells@redhat.com>
      Cc: Jesper Nilsson <Jesper.Nilsson@axis.com
      Signed-off-by: default avatarSam Ravnborg <sam@ravnborg.org>
      39a449d9
  27. 24 Jun, 2009 1 commit
    • Tejun Heo's avatar
      linker script: throw away .discard section · 405d967d
      Tejun Heo authored
      
      
      x86 throws away .discard section but no other archs do.  Also,
      .discard is not thrown away while linking modules.  Make every arch
      and module linking throw it away.  This will be used to define dummy
      variables for percpu declarations and definitions.
      
      This patch is based on Ivan Kokshaysky's alpha percpu patch.
      
      [ Impact: always throw away everything in .discard ]
      Signed-off-by: default avatarTejun Heo <tj@kernel.org>
      Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
      Cc: Richard Henderson <rth@twiddle.net>
      Cc: Russell King <linux@arm.linux.org.uk>
      Cc: Haavard Skinnemoen <hskinnemoen@atmel.com>
      Cc: Bryan Wu <cooloney@kernel.org>
      Cc: Mikael Starvik <starvik@axis.com>
      Cc: Jesper Nilsson <jesper.nilsson@axis.com>
      Cc: David Howells <dhowells@redhat.com>
      Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
      Cc: Tony Luck <tony.luck@intel.com>
      Cc: Hirokazu Takata <takata@linux-m32r.org>
      Cc: Geert Uytterhoeven <geert@linux-m68k.org>
      Cc: Michal Simek <monstr@monstr.eu>
      Cc: Ralf Baechle <ralf@linux-mips.org>
      Cc: Kyle McMartin <kyle@mcmartin.ca>
      Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
      Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
      Cc: Paul Mundt <lethal@linux-sh.org>
      Cc: David S. Miller <davem@davemloft.net>
      Cc: Jeff Dike <jdike@addtoit.com>
      Cc: Chris Zankel <chris@zankel.net>
      Cc: Rusty Russell <rusty@rustcorp.com.au>
      Cc: Ingo Molnar <mingo@elte.hu>
      405d967d
  28. 22 Jun, 2009 1 commit
  29. 21 Jun, 2009 1 commit
  30. 18 Jun, 2009 2 commits