[lkml]   [2007]   [Apr]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
    SubjectRe: [5/6] dynamically allocate IRQ stacks (was: Re: [-mm patch] i386: enable 4k stacks by default)
    On Mon, 30 Apr 2007, William Lee Irwin III wrote:
    >> -static char softirq_stack[NR_CPUS * THREAD_SIZE]
    >> - __attribute__((__aligned__(THREAD_SIZE)));
    >> +static DEFINE_PER_CPU(char *, softirq_stack);
    >> +static DEFINE_PER_CPU(char *, hardirq_stack);
    >> -static char hardirq_stack[NR_CPUS * THREAD_SIZE]
    >> - __attribute__((__aligned__(THREAD_SIZE)));
    >> +static void * __init __alloc_irqstack(int cpu)

    On Mon, Apr 30, 2007 at 12:49:04PM -0700, Zwane Mwaikambo wrote:
    > How about just using DEFINE_PER_CPU and allowing the percpu code
    > dynamically allocate.

    The indirection was needed to vmalloc()/vmap() the IRQ stacks. It
    should probably be decided explicitly whether vmalloc() of the IRQ
    stacks is considered desirable for any mainline merge of these things.

    This code is by no means sacred to me, so I have no particular
    preference with respect to the suggested tradeoffs or reworks. Whatever
    people want out of all this for mainline (even if nothing) is fine by me.

    -- wli
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to
    More majordomo info at
    Please read the FAQ at

     \ /
      Last update: 2007-04-30 22:09    [W:0.024 / U:7.220 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site