Eric Lee / smarc-fsl-linux-kernel

07 Oct, 2015

1 commit

  • 2c4ac34bc   documentation: Correct doc to use rcu_dereference_protected ... Browse Code »

    As there is lots of misinformation and outdated information on the
    Internet about nearly all topics related to the kernel, I thought it
    would be best if I based my RCU code on the guidelines of the examples
    in the Documentation/ tree of the latest kernel. One thing that stuck
    out when reading the whatisRCU.txt document was, "interesting how we
    don't need any function to dereference rcu protected pointers when doing
    updates if a lock is held. I wonder how static analyzers will work with
    that." Then, a few weeks later, upon discovering sparse's __rcu support,
    I ran it over my code, and lo and behold, things weren't done right.
    Examining other RCU usages in the kernel reveal consistent usage of
    rcu_dereference_protected, passing in lockdep_is_held as the
    conditional. So, this patch adds that idiom to the documentation, so
    that others ahead of me won't endure the same exercise.

    Signed-off-by: Jason A. Donenfeld
    Signed-off-by: Paul E. McKenney
    Reviewed-by: Josh Triplett

    Jason A. Donenfeld
     

23 Jul, 2015

1 commit

28 May, 2015

3 commits

30 Oct, 2014

1 commit

07 Aug, 2014

1 commit

  • 1d023284c   list: fix order of arguments for hlist_add_after(_rcu) ... Browse Code »

    All other add functions for lists have the new item as first argument
    and the position where it is added as second argument. This was changed
    for no good reason in this function and makes using it unnecessary
    confusing.

    The name was changed to hlist_add_behind() to cause unconverted code to
    generate a compile error instead of using the wrong parameter order.

    [akpm@linux-foundation.org: coding-style fixes]
    Signed-off-by: Ken Helias
    Cc: "Paul E. McKenney"
    Acked-by: Jeff Kirsher [intel driver bits]
    Cc: Hugh Dickins
    Cc: Christoph Hellwig
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Ken Helias
     

29 Apr, 2014

1 commit

11 Jun, 2013

1 commit

13 Mar, 2013

1 commit

  • 4357fb570   rcu: Make bugginess of code sample more evident ... Browse Code »

    One of the code samples in whatisRCU.txt shows a bug, but someone scanning
    the document quickly might mistake it for a valid use of RCU. Add some
    screaming comments to help keep speed-readers on track.

    Reported-by: Nathan Zimmer
    Signed-off-by: Paul E. McKenney
    Acked-by: Rafael J. Wysocki

    Paul E. McKenney
     

17 Nov, 2012

1 commit

  • aac1cda34   Merge branches 'urgent.2012.10.27a', 'doc.2012.11.16a', 'fixes.2012.11.13a', 'sr… ... Browse Code »

    …cu.2012.10.27a', 'stall.2012.11.13a', 'tracing.2012.11.08a' and 'idle.2012.10.24a' into HEAD

    urgent.2012.10.27a: Fix for RCU user-mode transition (already in -tip).

    doc.2012.11.08a: Documentation updates, most notably codifying the
    memory-barrier guarantees inherent to grace periods.

    fixes.2012.11.13a: Miscellaneous fixes.

    srcu.2012.10.27a: Allow statically allocated and initialized srcu_struct
    structures (courtesy of Lai Jiangshan).

    stall.2012.11.13a: Add more diagnostic information to RCU CPU stall
    warnings, also decrease from 60 seconds to 21 seconds.

    hotplug.2012.11.08a: Minor updates to CPU hotplug handling.

    tracing.2012.11.08a: Improved debugfs tracing, courtesy of Michael Wang.

    idle.2012.10.24a: Updates to RCU idle/adaptive-idle handling, including
    a boot parameter that maps normal grace periods to expedited.

    Resolved conflict in kernel/rcutree.c due to side-by-side change.

    Paul E. McKenney
     

14 Nov, 2012

1 commit

09 Nov, 2012

1 commit

23 Sep, 2012

1 commit

  • 2aef619c7   rcu: Document SRCU dead-CPU capabilities, emphasize read-side limits ... Browse Code »

    The current documentation did not help someone grepping for SRCU to
    learn that disabling preemption is not a replacement for srcu_read_lock(),
    so upgrade the documentation to bring this out, not just for SRCU,
    but also for RCU-bh. Also document the fact that SRCU readers are
    respected on CPUs executing in user mode, idle CPUs, and even on
    offline CPUs.

    Signed-off-by: Paul E. McKenney
    Reviewed-by: Josh Triplett
    Reviewed-by: Lai Jiangshan

    Paul E. McKenney
     

03 Jul, 2012

1 commit

12 Dec, 2011

2 commits

05 Mar, 2011

1 commit

14 Apr, 2010

1 commit

  • 50aec0024   rcu: Update docs for rcu_access_pointer and rcu_dereference_protected ... Browse Code »

    Update examples and lists of APIs to include these new
    primitives.

    Signed-off-by: Paul E. McKenney
    Cc: laijs@cn.fujitsu.com
    Cc: dipankar@in.ibm.com
    Cc: mathieu.desnoyers@polymtl.ca
    Cc: josh@joshtriplett.org
    Cc: dvhltc@us.ibm.com
    Cc: niv@us.ibm.com
    Cc: peterz@infradead.org
    Cc: rostedt@goodmis.org
    Cc: Valdis.Kletnieks@vt.edu
    Cc: dhowells@redhat.com
    Cc: eric.dumazet@gmail.com
    LKML-Reference:
    Signed-off-by: Ingo Molnar

    Paul E. McKenney
     

25 Feb, 2010

1 commit

  • c598a070b   rcu: Documentation update for CONFIG_PROVE_RCU ... Browse Code »

    Adds a lockdep.txt file and updates checklist.txt and
    whatisRCU.txt to reflect the new lockdep-enabled capabilities of
    RCU.

    Signed-off-by: Paul E. McKenney
    Cc: laijs@cn.fujitsu.com
    Cc: dipankar@in.ibm.com
    Cc: mathieu.desnoyers@polymtl.ca
    Cc: josh@joshtriplett.org
    Cc: dvhltc@us.ibm.com
    Cc: niv@us.ibm.com
    Cc: peterz@infradead.org
    Cc: rostedt@goodmis.org
    Cc: Valdis.Kletnieks@vt.edu
    Cc: dhowells@redhat.com
    LKML-Reference:
    Signed-off-by: Ingo Molnar

    Paul E. McKenney
     

16 Jan, 2010

1 commit

  • 4c54005ca   rcu: 1Q2010 update for RCU documentation ... Browse Code »

    Add expedited functions. Review documentation and update
    obsolete verbiage. Also fix the advice for the RCU CPU-stall
    kernel configuration parameter, and document RCU CPU-stall
    warnings.

    Signed-off-by: Paul E. McKenney
    Cc: laijs@cn.fujitsu.com
    Cc: dipankar@in.ibm.com
    Cc: mathieu.desnoyers@polymtl.ca
    Cc: josh@joshtriplett.org
    Cc: dvhltc@us.ibm.com
    Cc: niv@us.ibm.com
    Cc: peterz@infradead.org
    Cc: rostedt@goodmis.org
    Cc: Valdis.Kletnieks@vt.edu
    Cc: dhowells@redhat.com
    LKML-Reference:
    Signed-off-by: Ingo Molnar

    Paul E. McKenney
     

26 Oct, 2009

1 commit

  • 64179861c   rcu: Add synchronize_srcu_expedited() to the documentation ... Browse Code »

    Signed-off-by: Paul E. McKenney
    Acked-by: Josh Triplett
    Reviewed-by: Lai Jiangshan
    Cc: dipankar@in.ibm.com
    Cc: mathieu.desnoyers@polymtl.ca
    Cc: dvhltc@us.ibm.com
    Cc: niv@us.ibm.com
    Cc: peterz@infradead.org
    Cc: rostedt@goodmis.org
    Cc: Valdis.Kletnieks@vt.edu
    Cc: dhowells@redhat.com
    Cc: avi@redhat.com
    Cc: mtosatti@redhat.com
    LKML-Reference:
    Signed-off-by: Ingo Molnar

    Paul E. McKenney
     

23 Aug, 2009

1 commit

  • 6b3ef48ad   rcu: Remove CONFIG_PREEMPT_RCU ... Browse Code »

    Now that CONFIG_TREE_PREEMPT_RCU is in place, there is no
    further need for CONFIG_PREEMPT_RCU. Remove it, along with
    whatever subtle bugs it may (or may not) contain.

    Signed-off-by: Paul E. McKenney
    Cc: laijs@cn.fujitsu.com
    Cc: dipankar@in.ibm.com
    Cc: akpm@linux-foundation.org
    Cc: mathieu.desnoyers@polymtl.ca
    Cc: josht@linux.vnet.ibm.com
    Cc: dvhltc@us.ibm.com
    Cc: niv@us.ibm.com
    Cc: peterz@infradead.org
    Cc: rostedt@goodmis.org
    LKML-Reference:
    Signed-off-by: Ingo Molnar

    Paul E. McKenney
     

03 Jul, 2009

1 commit

  • 240ebbf81   rcu: Add synchronize_sched_expedited() rcutorture doc + updates ... Browse Code »

    This patch updates the rcutorture documentation to include
    updated output format. It also brings the RCU documentation up
    to date.

    Signed-off-by: Paul E. McKenney
    Cc: akpm@linux-foundation.org
    Cc: torvalds@linux-foundation.org
    Cc: davem@davemloft.net
    Cc: dada1@cosmosbay.com
    Cc: zbr@ioremap.net
    Cc: jeff.chua.linux@gmail.com
    Cc: paulus@samba.org
    Cc: laijs@cn.fujitsu.com
    Cc: jengelh@medozas.de
    Cc: r000n@r000n.net
    Cc: benh@kernel.crashing.org
    Cc: mathieu.desnoyers@polymtl.ca
    LKML-Reference:
    Signed-off-by: Ingo Molnar

    Paul E. McKenney
     

15 Aug, 2008

1 commit

19 May, 2008

1 commit

04 Oct, 2006

3 commits

  • 621934ee7   [PATCH] srcu-3: RCU variant permitting read-side blocking ... Browse Code »

    Updated patch adding a variant of RCU that permits sleeping in read-side
    critical sections. SRCU is as follows:

    o Each use of SRCU creates its own srcu_struct, and each
    srcu_struct has its own set of grace periods. This is
    critical, as it prevents one subsystem with a blocking
    reader from holding up SRCU grace periods for other
    subsystems.

    o The SRCU primitives (srcu_read_lock(), srcu_read_unlock(),
    and synchronize_srcu()) all take a pointer to a srcu_struct.

    o The SRCU primitives must be called from process context.

    o srcu_read_lock() returns an int that must be passed to
    the matching srcu_read_unlock(). Realtime RCU avoids the
    need for this by storing the state in the task struct,
    but SRCU needs to allow a given code path to pass through
    multiple SRCU domains -- storing state in the task struct
    would therefore require either arbitrary space in the
    task struct or arbitrary limits on SRCU nesting. So I
    kicked the state-storage problem up to the caller.

    Of course, it is not permitted to call synchronize_srcu()
    while in an SRCU read-side critical section.

    o There is no call_srcu(). It would not be hard to implement
    one, but it seems like too easy a way to OOM the system.
    (Hey, we have enough trouble with call_rcu(), which does
    -not- permit readers to sleep!!!) So, if you want it,
    please tell me why...

    [josht@us.ibm.com: sparse notation]
    Signed-off-by: Paul E. McKenney
    Signed-off-by: Josh Triplett
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Paul E. McKenney
     
  • 670e9f34e   Documentation: remove duplicated words ... Browse Code »

    Remove many duplicated words under Documentation/ and do other small
    cleanups.

    Examples:
    "and and" --> "and"
    "in in" --> "in"
    "the the" --> "the"
    "the the" --> "to the"
    ...

    Signed-off-by: Paolo Ornati
    Signed-off-by: Adrian Bunk

    Paolo Ornati
     
  • 53cb47268   Fix typos in Documentation/: 'S' ... Browse Code »

    This patch fixes typos in various Documentation txts. The patch addresses
    some words starting with the letter 'S'.

    Signed-off-by: Matt LaPlante
    Acked-by: Alan Cox
    Acked-by: Randy Dunlap
    Signed-off-by: Adrian Bunk

    Matt LaPlante
     

11 Jul, 2006

1 commit

26 Jun, 2006

1 commit

  • 165d6c78e   [PATCH] RCU documentation: self-limiting updates and call_rcu() ... Browse Code »

    An update to the RCU documentation calling out the
    self-limiting-update-rate advantages of synchronize_rcu(), and describing
    how to use call_rcu() in a way that results in self-limiting updates.
    Self-limiting updates are important to avoiding RCU-induced OOM in face of
    denial-of-service attacks.

    Signed-off-by: Paul E. McKenney
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Paul E. McKenney
     

23 Jun, 2006

1 commit

29 Mar, 2006

1 commit

25 Mar, 2006

1 commit

02 Feb, 2006

1 commit

07 Nov, 2005

1 commit

11 Sep, 2005

1 commit