lkml.org 
[lkml]   [2007]   [Aug]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    Date
    From
    Subject[patch 22/28] Add cmpxchg_local to s390
    Use the standard __cmpxchg for every type that can be updated atomically.
    Use the new generic cmpxchg_local (disables interrupt) for other types.

    Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
    CC: clameter@sgi.com
    CC: schwidefsky@de.ibm.com
    CC: linux390@de.ibm.com
    ---
    include/asm-s390/system.h | 34 ++++++++++++++++++++++++++++++++++
    1 file changed, 34 insertions(+)

    Index: linux-2.6-lttng/include/asm-s390/system.h
    ===================================================================
    --- linux-2.6-lttng.orig/include/asm-s390/system.h 2007-08-27 11:46:43.000000000 -0400
    +++ linux-2.6-lttng/include/asm-s390/system.h 2007-08-27 11:48:38.000000000 -0400
    @@ -355,6 +355,40 @@ __cmpxchg(volatile void *ptr, unsigned l

    #include <linux/irqflags.h>

    +#include <asm-generic/cmpxchg-local.h>
    +
    +static inline unsigned long __cmpxchg_local(volatile void *ptr,
    + unsigned long old,
    + unsigned long new, int size)
    +{
    + switch (size) {
    + case 1:
    + case 2:
    + case 4:
    +#ifdef __s390x__
    + case 8:
    +#endif
    + return __cmpxchg(ptr, old, new, size);
    + default:
    + return __cmpxchg_local_generic(ptr, old, new, size);
    + }
    +
    + return old;
    +}
    +
    +/*
    + * cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make
    + * them available.
    + */
    +#define cmpxchg_local(ptr,o,n) \
    + (__typeof__(*(ptr)))__cmpxchg_local((ptr), (unsigned long)(o), \
    + (unsigned long)(n), sizeof(*(ptr)))
    +#ifdef __s390x__
    +#define cmpxchg64_local(ptr,o,n) cmpxchg_local((ptr),(o),(n))
    +#else
    +#define cmpxchg64_local(ptr,o,n) __cmpxchg64_local_generic((ptr), (o), (n))
    +#endif
    +
    /*
    * Use to set psw mask except for the first byte which
    * won't be changed by this function.
    --
    Mathieu Desnoyers
    Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
    OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68
    -
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to majordomo@vger.kernel.org
    More majordomo info at http://vger.kernel.org/majordomo-info.html
    Please read the FAQ at http://www.tux.org/lkml/

    \
     
     \ /
      Last update: 2007-08-27 18:01    [W:0.023 / U:34.464 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site