On Mon, Jun 10, 2013 at 04:47:58PM -0400, Steven Rostedt wrote:
> On Sun, 2013-06-09 at 12:36 -0700, Paul E. McKenney wrote:
>
> > --- a/arch/x86/include/asm/spinlock_types.h
> > +++ b/arch/x86/include/asm/spinlock_types.h
> > @@ -7,12 +7,18 @@
> >
> > #include <linux/types.h>
> >
> > -#if (CONFIG_NR_CPUS < 256)
> > +#if (CONFIG_NR_CPUS < 128)
> > typedef u8 __ticket_t;
> > typedef u16 __ticketpair_t;
> > -#else
> > +#define TICKET_T_CMP_GE(a, b) (UCHAR_MAX / 2 >= (unsigned char)((a) - (b)))
> > +#elif (CONFIG_NR_CPUS < 32768)
> > typedef u16 __ticket_t;
> > typedef u32 __ticketpair_t;
> > +#define TICKET_T_CMP_GE(a, b) (USHRT_MAX / 2 >= (unsigned short)((a) -
> > (b)))
> > +#else
> > +typedef u32 __ticket_t;
> > +typedef u64 __ticketpair_t;
> > +#define TICKET_T_CMP_GE(a, b) (UINT_MAX / 2 >= (unsigned int)((a) - (b)))
> > #endif
> >
> > #define TICKET_SHIFT (sizeof(__ticket_t) * 8)
> > @@ -21,7 +27,11 @@ typedef struct arch_spinlock {
> > union {
> > __ticketpair_t head_tail;
> > struct __raw_tickets {
> > +#ifdef __BIG_ENDIAN__
>
> Is there such a thing as a BIG_ENDIAN x86 box? This is in
> arch/x86/include/asm/spinlock_types.h
Nope. Preparation work for moving this to common code.
Good point though, I should have skipped this #ifdef until I got everything
into common code.
Thanx, Paul
> -- Steve
>
> > + __ticket_t tail, head;
> > +#else /* #ifdef __BIG_ENDIAN__ */
> > __ticket_t head, tail;
> > +#endif /* #else #ifdef __BIG_ENDIAN__ */
> > } tickets;
> > };
> > } arch_spinlock_t;
>
>
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