Doug / smarc-fsl-linux-kernel

09 Oct, 2012

1 commit

  • e79bee24f   atomic: implement generic atomic_dec_if_positive() ... Browse Code »

    The x86 implementation of atomic_dec_if_positive is quite generic, so make
    it available to all architectures.

    This is needed for "swap: add a simple detector for inappropriate swapin
    readahead".

    [akpm@linux-foundation.org: do the "#define foo foo" trick in the conventional manner]
    Signed-off-by: Shaohua Li
    Cc: Stephen Rothwell
    Cc: "David S. Miller"
    Cc: Rik van Riel
    Cc: Ingo Molnar
    Cc: Thomas Gleixner
    Cc: "H. Peter Anvin"
    Cc: Benjamin Herrenschmidt
    Cc: Michal Simek
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Shaohua Li
     

07 Mar, 2012

1 commit

27 Jul, 2011

4 commits

  • acac43e2f   atomic: Update comments in atomic.h ... Browse Code »

    This clarifies the differences between and

    Signed-off-by: Arun Sharma
    Suggested-by: Mike Frysinger
    Cc: Eric Dumazet
    Cc: Ingo Molnar
    Cc: David Miller
    Acked-by: Mike Frysinger
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Arun Sharma
     
  • 7847777a4   atomic: cleanup asm-generic atomic*.h inclusion ... Browse Code »

    After changing all consumers of atomics to include , we
    ran into some compile time errors due to this dependency chain:

    linux/atomic.h
    -> asm/atomic.h
    -> asm-generic/atomic-long.h

    where atomic-long.h could use funcs defined later in linux/atomic.h
    without a prototype. This patches moves the code that includes
    asm-generic/atomic*.h to linux/atomic.h.

    Archs that need need to select
    CONFIG_GENERIC_ATOMIC64 from now on (some of them used to include it
    unconditionally).

    Compile tested on i386 and x86_64 with allnoconfig.

    Signed-off-by: Arun Sharma
    Cc: Eric Dumazet
    Cc: Ingo Molnar
    Cc: David Miller
    Acked-by: Mike Frysinger
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Arun Sharma
     
  • f24219b4e   atomic: move atomic_add_unless to generic code ... Browse Code »

    This is in preparation for more generic atomic primitives based on
    __atomic_add_unless.

    Signed-off-by: Arun Sharma
    Signed-off-by: Hans-Christian Egtvedt
    Reviewed-by: Eric Dumazet
    Cc: Ingo Molnar
    Cc: David Miller
    Acked-by: Mike Frysinger
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Arun Sharma
     
  • 60063497a   atomic: use <linux/atomic.h> ... Browse Code »

    This allows us to move duplicated code in
    (atomic_inc_not_zero() for now) to

    Signed-off-by: Arun Sharma
    Reviewed-by: Eric Dumazet
    Cc: Ingo Molnar
    Cc: David Miller
    Cc: Eric Dumazet
    Acked-by: Mike Frysinger
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Arun Sharma
     

20 Jul, 2011

1 commit

28 May, 2011

1 commit

12 Nov, 2010

1 commit

  • 3f9d35b95   atomic: add atomic_inc_not_zero_hint() ... Browse Code »

    Followup of perf tools session in Netfilter WorkShop 2010

    In the network stack we make high usage of atomic_inc_not_zero() in
    contexts we know the probable value of atomic before increment (2 for udp
    sockets for example)

    Using a special version of atomic_inc_not_zero() giving this hint can help
    processor to use less bus transactions.

    On x86 (MESI protocol) for example, this avoids entering Shared state,
    because "lock cmpxchg" issues an RFO (Read For Ownership)

    akpm: Adds a new include/linux/atomic.h. This means that new code should
    henceforth include linux/atomic.h and not asm/atomic.h. The presence of
    include/linux/atomic.h will in fact cause checkpatch.pl to warn about use
    of asm/atomic.h. The new include/linux/atomic.h becomes the place where
    arch-neutral atomic_t code should be placed.

    [akpm@linux-foundation.org: coding-style fixes]
    Signed-off-by: Eric Dumazet
    Cc: Christoph Lameter
    Cc: Ingo Molnar
    Cc: Andi Kleen
    Cc: Arnaldo Carvalho de Melo
    Cc: David Miller
    Cc: "Paul E. McKenney"
    Cc: Nick Piggin
    Reviewed-by: "Paul E. McKenney"
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Eric Dumazet