ARM: GIC: dont warn on pre-allocated IRQ descs

Message ID
State New
Headers show

Commit Message

Linus Walleij Sept. 25, 2012, 7:19 p.m.
From: Linus Walleij <>

Currently, if you try to turn on CONFIG_SPARSE_IRQS for a platform
using the GIC, you will get this in your face:

------------[ cut here ]------------
WARNING: at /home/elinwal/linux-stericsson/arch/arm/common/gic.c:713 gic_init_bases+0xe8/0x290()
Cannot allocate irq_descs @ IRQ16, assuming pre-allocated
Modules linked in:
[<c0014710>] (unwind_backtrace+0x0/0xf8) from [<c001d304>] (warn_slowpath_common+0x4c/0x64)
[<c001d304>] (warn_slowpath_common+0x4c/0x64) from [<c001d3b0>] (warn_slowpath_fmt+0x30/0x40)
[<c001d3b0>] (warn_slowpath_fmt+0x30/0x40) from [<c03e60f8>] (gic_init_bases+0xe8/0x290)
[<c03e60f8>] (gic_init_bases+0xe8/0x290) from [<c03e6560>] (ux500_init_irq+0xb0/0xfc)
[<c03e6560>] (ux500_init_irq+0xb0/0xfc) from [<c03e2114>] (init_IRQ+0x14/0x1c)
[<c03e2114>] (init_IRQ+0x14/0x1c) from [<c03df698>] (start_kernel+0x198/0x2ec)
[<c03df698>] (start_kernel+0x198/0x2ec) from [<00008044>] (0x8044)
---[ end trace 1b75b31a2719ed1c ]---

This is because the GIC tries to allocate fresh IRQ descs for
its IRQs, and that would work with non-sparse IRQs but fails
with sparse IRQs because the .nr_irqs from the platform always
get pre-allocated at boot time.

The allocation will succeed if the platform define .nr_irqs
to 0 as an ideal device tree platform would do, but I think it
is a bit thick to require that every platform that wants to
use sparse IRQs must first or simultaneously switch to
device tree. So make this to a simple pr_debug().

Cc: Arnd Bergmann <>
Cc: Rob Herring <>
Cc: Grant Likely <>
Signed-off-by: Linus Walleij <>
 arch/arm/common/gic.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)


diff --git a/arch/arm/common/gic.c b/arch/arm/common/gic.c
index aa52699..fcda633 100644
--- a/arch/arm/common/gic.c
+++ b/arch/arm/common/gic.c
@@ -707,7 +707,7 @@  void __init gic_init_bases(unsigned int gic_nr, int irq_start,
 	gic_irqs -= hwirq_base; /* calculate # of irqs to allocate */
 	irq_base = irq_alloc_descs(irq_start, 16, gic_irqs, numa_node_id());
 	if (IS_ERR_VALUE(irq_base)) {
-		WARN(1, "Cannot allocate irq_descs @ IRQ%d, assuming pre-allocated\n",
+		pr_debug("Cannot allocate irq_descs @ IRQ%d, assuming pre-allocated\n",
 		irq_base = irq_start;