lkml.org 
[lkml]   [2012]   [Feb]   [3]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    Date
    From
    Subject[PATCH] x86: eliminate TICKET_MASK
    The definition of it being questionable already (unnecessarily
    including a cast), and it being used in a single place that can be
    written shorter without it, remove this #define.

    Along the same lines, simplify __ticket_spin_is_locked()'s main
    expression, which was the more convoluted way because of needs that
    went away with the recent type changes by Jeremy.

    This is pure cleanup, no functional change intended.

    Signed-off-by: Jan Beulich <jbeulich@suse.com>
    Cc: Jeremy Fitzhardinge <jeremy@goop.org>

    ---
    arch/x86/include/asm/spinlock.h | 4 ++--
    arch/x86/include/asm/spinlock_types.h | 1 -
    2 files changed, 2 insertions(+), 3 deletions(-)

    --- 3.3-rc2/arch/x86/include/asm/spinlock.h
    +++ 3.3-rc2-x86-ticket-mask/arch/x86/include/asm/spinlock.h
    @@ -88,14 +88,14 @@ static inline int __ticket_spin_is_locke
    {
    struct __raw_tickets tmp = ACCESS_ONCE(lock->tickets);

    - return !!(tmp.tail ^ tmp.head);
    + return tmp.tail != tmp.head;
    }

    static inline int __ticket_spin_is_contended(arch_spinlock_t *lock)
    {
    struct __raw_tickets tmp = ACCESS_ONCE(lock->tickets);

    - return ((tmp.tail - tmp.head) & TICKET_MASK) > 1;
    + return (__ticket_t)(tmp.tail - tmp.head) > 1;
    }

    #ifndef CONFIG_PARAVIRT_SPINLOCKS
    --- 3.3-rc2/arch/x86/include/asm/spinlock_types.h
    +++ 3.3-rc2-x86-ticket-mask/arch/x86/include/asm/spinlock_types.h
    @@ -16,7 +16,6 @@ typedef u32 __ticketpair_t;
    #endif

    #define TICKET_SHIFT (sizeof(__ticket_t) * 8)
    -#define TICKET_MASK ((__ticket_t)((1 << TICKET_SHIFT) - 1))

    typedef struct arch_spinlock {
    union {




    \
     
     \ /
      Last update: 2012-02-03 16:09    [W:0.020 / U:10.900 seconds]
    ©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site