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    SubjectRe: Fix irq_affinity write from /proc for IPF
    Ashok Raj <ashok.raj@intel.com> wrote:
    >
    > Hi Andrew/Tony
    >
    > This patch is required for IPF to perform deferred write to rte's when
    > affinity is programmed via /proc. These entries can only be programmed when
    > interrupt is pending.

    "ia64" is preferred, please. Nobody knows what an IPF is.

    >
    > release_dir-araj/arch/ia64/kernel/irq.c | 12 ++++++++++--
    > release_dir-araj/kernel/irq/proc.c | 10 ++++++++--
    > 2 files changed, 18 insertions(+), 4 deletions(-)
    >
    > diff -puN arch/ia64/kernel/irq.c~fix_ia64_smp_affinity arch/ia64/kernel/irq.c
    > --- release_dir/arch/ia64/kernel/irq.c~fix_ia64_smp_affinity 2005-03-14 14:35:44.589293491 -0800
    > +++ release_dir-araj/arch/ia64/kernel/irq.c 2005-03-14 15:27:54.262106715 -0800
    > @@ -94,12 +94,20 @@ skip:
    > /*
    > * This is updated when the user sets irq affinity via /proc
    > */
    > -cpumask_t __cacheline_aligned pending_irq_cpumask[NR_IRQS];
    > +static cpumask_t __cacheline_aligned pending_irq_cpumask[NR_IRQS];
    > static unsigned long pending_irq_redir[BITS_TO_LONGS(NR_IRQS)];
    >
    > -static cpumask_t irq_affinity [NR_IRQS] = { [0 ... NR_IRQS-1] = CPU_MASK_ALL };
    > static char irq_redir [NR_IRQS]; // = { [0 ... NR_IRQS-1] = 1 };
    >
    > +/*
    > + * Arch specific routine for deferred write to iosapic rte to reprogram
    > + * intr destination.
    > + */
    > +void proc_set_irq_affinity(unsigned int irq, cpumask_t mask_val)
    > +{
    > + pending_irq_cpumask[irq] = mask_val;
    > +}
    > +
    > void set_irq_affinity_info (unsigned int irq, int hwid, int redir)
    > {
    > cpumask_t mask = CPU_MASK_NONE;
    > diff -puN kernel/irq/proc.c~fix_ia64_smp_affinity kernel/irq/proc.c
    > --- release_dir/kernel/irq/proc.c~fix_ia64_smp_affinity 2005-03-14 14:41:05.475031747 -0800
    > +++ release_dir-araj/kernel/irq/proc.c 2005-03-14 15:27:59.436911339 -0800
    > @@ -19,6 +19,13 @@ static struct proc_dir_entry *root_irq_d
    > */
    > static struct proc_dir_entry *smp_affinity_entry[NR_IRQS];
    >
    > +void __attribute__((weak))
    > +proc_set_irq_affinity(unsigned int irq, cpumask_t mask_val)
    > +{
    > + irq_affinity[irq] = mask_val;
    > + irq_desc[irq].handler->set_affinity(irq, mask_val);
    > +}
    > +

    Is it not possible for ia64's ->set_affinity() handler to do this deferring?

    -
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