lkml.org 
[lkml]   [2002]   [Aug]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    Subject[PATCH] 2.5.32: is_smp() and can_be_smp()
    From
    Date
    Will be used by another patch that I'll post in the very near future.
    For i386 cpucount is used rather than computing the hweight of
    cpu_online_map since it's faster and already there.
    Ideally the same should be done for all architectures in both these
    macros and num_online_cpus and num_possible_cpus.


    diff --exclude-from=/home/ldb/src/linux-exclude -urNdp linux-2.5.32/include/asm-i386/smp.h linux-2.5.32_smp/include/asm-i386/smp.h
    --- linux-2.5.32/include/asm-i386/smp.h 2002-08-27 21:26:32.000000000 +0200
    +++ linux-2.5.32_smp/include/asm-i386/smp.h 2002-08-27 23:25:09.000000000 +0200
    @@ -94,6 +94,10 @@ extern inline unsigned int num_online_cp
    return hweight32(cpu_online_map);
    }

    +extern int cpucount;
    +#define is_smp() (cpucount)
    +#define can_be_smp() (cpucount)
    +
    extern inline int any_online_cpu(unsigned int mask)
    {
    if (mask & cpu_online_map)
    diff --exclude-from=/home/ldb/src/linux-exclude -urNdp linux-2.5.32/include/linux/smp.h linux-2.5.32_smp/include/linux/smp.h
    --- linux-2.5.32/include/linux/smp.h 2002-08-27 21:26:43.000000000 +0200
    +++ linux-2.5.32_smp/include/linux/smp.h 2002-08-27 23:25:47.000000000 +0200
    @@ -78,6 +78,19 @@ extern int register_cpu_notifier(struct
    extern void unregister_cpu_notifier(struct notifier_block *nb);

    int cpu_up(unsigned int cpu);
    +
    +#ifndef is_smp
    +#define is_smp() (num_online_cpus() > 1)
    +#endif
    +
    +#ifndef can_be_smp
    +#ifdef num_possible_cpus
    +#define can_be_smp() (num_possible_cpus() > 1)
    +#else
    +#define can_be_smp() is_smp()
    +#endif
    +#endif
    +
    #else /* !SMP */

    /*
    @@ -96,6 +109,8 @@ static inline void smp_send_reschedule_a
    #define cpu_online_map 1
    #define cpu_online(cpu) ({ cpu; 1; })
    #define num_online_cpus() 1
    +#define is_smp() 0
    +#define can_be_smp() 0
    #define num_booting_cpus() 1

    struct notifier_block;
    [unhandled content-type:application/pgp-signature]
    \
     
     \ /
      Last update: 2005-03-22 13:28    [W:0.022 / U:178.640 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site