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    SubjectRe: [PATCH] local_t protection (critical section)
    On Wed, 5 Sep 2007, Mathieu Desnoyers wrote:

    > Index: linux-2.6-lttng/include/asm-generic/local.h
    > ===================================================================
    > --- linux-2.6-lttng.orig/include/asm-generic/local.h 2007-09-04 15:32:02.000000000 -0400
    > +++ linux-2.6-lttng/include/asm-generic/local.h 2007-09-05 08:50:47.000000000 -0400
    > @@ -46,6 +46,15 @@ typedef struct
    > #define local_add_unless(l, a, u) atomic_long_add_unless((&(l)->a), (a), (u))
    > #define local_inc_not_zero(l) atomic_long_inc_not_zero(&(l)->a)
    >
    > +#define local_enter_save(flags) local_irq_save(flags)
    > +#define local_exit_restore(flags) local_irq_restore(flags)
    > +#define local_enter() local_irq_disable()
    > +#define local_exit() local_irq_enable()
    > +#define local_nest_irq_save(flags) (flags)
    > +#define local_nest_irq_restore(flags) (flags)
    > +#define local_nest_irq_disable()
    > +#define local_nest_irq_enable()
    > +

    This list is going to increase with RT support in SLUB? Argh.


    > Index: linux-2.6-lttng/include/asm-i386/local.h
    > ===================================================================
    > --- linux-2.6-lttng.orig/include/asm-i386/local.h 2007-09-04 15:28:52.000000000 -0400
    > +++ linux-2.6-lttng/include/asm-i386/local.h 2007-09-05 08:49:19.000000000 -0400
    > @@ -194,6 +194,23 @@ static __inline__ long local_sub_return(
    > })
    > #define local_inc_not_zero(l) local_add_unless((l), 1, 0)
    >
    > +#define local_enter_save(flags) \
    > + do { \
    > + (flags); \
    > + preempt_disable(); \
    > + } while (0)


    > +#define local_exit_restore(flags) \
    > + do { \
    > + (flags); \
    > + preempt_enable(); \
    > + } while (0)


    This does not result in warnings because a variable is not used or used
    uninitialized?
    -
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