From: Grant Likely <grant.likely@secretlab.ca>
To: Milton Miller <miltonm@bga.com>
Cc: Thomas Gleixner <tglx@linutronix.de>, linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH 30/37] powerpc: mpc62xx_pic: fix get_irq handling of NO_IRQ
Date: Wed, 11 May 2011 21:08:18 +0200 [thread overview]
Message-ID: <BANLkTiksrxw3zBtqSmSrjZeb9U1cCty2HQ@mail.gmail.com> (raw)
In-Reply-To: <e619719d90d94f19b6e2b47c3f36e7873da5bef9.1305092637.git.miltonm@bga.com>
On Wed, May 11, 2011 at 7:30 AM, Milton Miller <miltonm@bga.com> wrote:
> If none of irq category bits were set mpc52xx_get_irq() would pass
> NO_IRQ_IGNORE (-1) to irq_linear_revmap, which does an unsigned compare
> and declares the interrupt above the linear map range. =A0It then punts
> to irq_find_mapping, which performs a linear search of all irqs,
> which will likely miss and only then return NO_IRQ.
>
> If no status bit is set, then we should return NO_IRQ directly.
> The interrupt should not be suppressed from spurious counting, in fact
> that is the definition of supurious.
>
> Signed-off-by: Milton Miller <miltonm@bga.com>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
> ---
> ---
> =A0arch/powerpc/platforms/52xx/mpc52xx_pic.c | =A0 =A04 +++-
> =A01 files changed, 3 insertions(+), 1 deletions(-)
>
> diff --git a/arch/powerpc/platforms/52xx/mpc52xx_pic.c b/arch/powerpc/pla=
tforms/52xx/mpc52xx_pic.c
> index bb61181..1a9a495 100644
> --- a/arch/powerpc/platforms/52xx/mpc52xx_pic.c
> +++ b/arch/powerpc/platforms/52xx/mpc52xx_pic.c
> @@ -486,7 +486,7 @@ void __init mpc52xx_init_irq(void)
> =A0unsigned int mpc52xx_get_irq(void)
> =A0{
> =A0 =A0 =A0 =A0u32 status;
> - =A0 =A0 =A0 int irq =3D NO_IRQ_IGNORE;
> + =A0 =A0 =A0 int irq;
>
> =A0 =A0 =A0 =A0status =3D in_be32(&intr->enc_status);
> =A0 =A0 =A0 =A0if (status & 0x00000400) { =A0 =A0 =A0/* critical */
> @@ -509,6 +509,8 @@ unsigned int mpc52xx_get_irq(void)
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0} else {
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0irq |=3D (MPC52xx_IRQ_L1_P=
ERP << MPC52xx_IRQ_L1_OFFSET);
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0}
> + =A0 =A0 =A0 } else {
> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 return NO_IRQ;
> =A0 =A0 =A0 =A0}
>
> =A0 =A0 =A0 =A0return irq_linear_revmap(mpc52xx_irqhost, irq);
> --
> 1.7.0.4
>
>
--=20
Grant Likely, B.Sc., P.Eng.
Secret Lab Technologies Ltd.
next prev parent reply other threads:[~2011-05-11 19:08 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-11 5:43 [PATCH 00/37] fix paca memory usage and NR_CPU loops, factor ipi and simplify irq code Milton Miller
2011-05-11 5:28 ` [PATCH 01/37] powerpc: fix memory corruption from unallocated slaves Milton Miller
2011-05-11 5:28 ` [PATCH 02/37] powerpc: don't search for paca in freed memory Milton Miller
2011-05-11 5:28 ` [PATCH 03/37] powerpc/kdump64: Don't reference freed memory as pacas Milton Miller
2011-05-11 5:28 ` [PATCH 04/37] powerpc/iseries: cleanup and fix secondary startup Milton Miller
2011-05-11 5:28 ` [PATCH 05/37] powerpc: Respect nr_cpu_ids when calling set_cpu_possible and set_cpu_present Milton Miller
2011-05-11 5:28 ` [PATCH 06/37] powerpc: use nr_cpu_ids in initial paca allocation Milton Miller
2011-05-11 5:28 ` [PATCH 07/37] powerpc: call no-longer static setup_nr_cpu_ids instead of replicating it Milton Miller
2011-05-11 5:28 ` [PATCH 08/37] powerpc: mpic: limit NR_CPUS loop to 32 bit Milton Miller
2011-05-11 5:29 ` [PATCH 09/37] powerpc: mpic: break cpumask abstraction earlier Milton Miller
2011-05-11 5:29 ` [PATCH 10/37] powerpc: remove call sites of MSG_ALL_BUT_SELF Milton Miller
2011-05-11 5:29 ` [PATCH 11/37] powerpc: remove checks for MSG_ALL and MSG_ALL_BUT_SELF Milton Miller
2011-05-11 5:29 ` [PATCH 12/37] linux/smp.h: remove unused MSG_ flags Milton Miller
2011-05-11 5:29 ` [PATCH 13/37] powerpc/mpic: simplify ipi cpu mask handling Milton Miller
2011-05-11 5:29 ` [PATCH 14/37] powerpc: remove powermac/pic.h Milton Miller
2011-05-11 5:29 ` [PATCH 15/37] powerpc: remove alloc_maybe_bootmem for zalloc version Milton Miller
2011-05-11 5:29 ` [PATCH 16/37] powerpc: remove stubbed beat smp support Milton Miller
2011-05-11 5:29 ` [PATCH 17/37] powerpc cell: use smp_request_message_ipi Milton Miller
2011-05-11 5:29 ` [PATCH 18/37] powerpc: move smp_ops_t from machdep.h to smp.h Milton Miller
2011-05-11 5:29 ` [PATCH 19/37] powerpc: consolidate ipi message mux and demux Milton Miller
2011-05-19 6:57 ` Benjamin Herrenschmidt
2011-05-19 6:58 ` Benjamin Herrenschmidt
2011-05-11 5:29 ` [PATCH 20/37] powerpc: add kconfig for muxed smp ipi support Milton Miller
2011-05-11 5:29 ` [PATCH 21/37] powerpc: use bytes instead of bitops in smp ipi multiplexing Milton Miller
2011-05-11 5:29 ` [PATCH 22/37] powerpc: xics: cleanup xics_host_map and ipi Milton Miller
2011-05-11 5:29 ` [PATCH 23/37] powerpc: radix trees are available before init_IRQ Milton Miller
2011-05-11 19:00 ` Grant Likely
2011-05-11 5:29 ` [PATCH 24/37] powerpc: return early if irq_host lookup type is wrong Milton Miller
2011-05-11 19:03 ` Grant Likely
2011-05-11 5:30 ` [PATCH 25/37] powerpc: remove trival irq_host_ops.unmap Milton Miller
2011-05-11 5:30 ` [PATCH 26/37] powerpc: remove i8259 irq_host_ops->unmap Milton Miller
2011-05-11 5:30 ` [PATCH 27/37] powerpc fsl_msi: don't abuse platform_data for driver_data Milton Miller
2011-05-11 19:05 ` Grant Likely
2011-05-11 5:30 ` [PATCH 28/37] powerpc: fsl_msi: use chip_data not handler_data Milton Miller
2011-05-11 5:30 ` [PATCH 29/37] powerpc: mpc5121_ads_cpld: remove use of NO_IRQ_IGNORE Milton Miller
2011-05-11 19:07 ` Grant Likely
2011-05-11 5:30 ` [PATCH 30/37] powerpc: mpc62xx_pic: fix get_irq handling of NO_IRQ Milton Miller
2011-05-11 19:08 ` Grant Likely [this message]
2011-05-11 5:30 ` [PATCH 31/37] powerpc: psurge: create a irq_host for secondary cpus Milton Miller
2011-05-11 5:30 ` [PATCH 32/37] powerpc: remove irq_host_ops->remap hook Milton Miller
2011-05-11 5:30 ` [PATCH 33/37] powerpc: spider-pic: get pic from chip_data instead of irq_map Milton Miller
2011-05-11 19:13 ` Grant Likely
2011-05-11 5:30 ` [PATCH 34/37] powerpc: axon_msi: validate msi irq via chip_data Milton Miller
2011-05-11 5:30 ` [PATCH 35/37] powerpc: add virq_is_host to reduce virq_to_host usage Milton Miller
2011-05-11 19:16 ` Grant Likely
2011-05-11 5:30 ` [PATCH 36/37] powerpc: remove virq_to_host Milton Miller
2011-05-11 19:17 ` Grant Likely
2011-05-11 5:30 ` [PATCH 37/37] powerpc: make IRQ_NOREQUEST last to clear, first to set Milton Miller
2011-05-11 19:18 ` Grant Likely
2011-05-12 8:31 ` Milton Miller
2011-05-11 19:40 ` [PATCH 00/37] fix paca memory usage and NR_CPU loops, factor ipi and simplify irq code Grant Likely
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