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| author |   Yinghai Lu <yhlu.kernel@gmail.com> | 2008-08-19 20:50:03 -0700 |
|---|---|---|
| committer |   Ingo Molnar <mingo@elte.hu> | 2008-10-16 16:52:08 +0200 |
| commit | 71f521bbaf375b685aeea20c6b0ed8600cd6edfe (patch) | |
| tree | a18b8e8284ff7a68c341de8b1342866b9821ae7f /include/asm-x86 | |
| parent | irq: sparse irqs, fix #3 (diff) | |
| download | linux-dev-71f521bbaf375b685aeea20c6b0ed8600cd6edfe.tar.xz linux-dev-71f521bbaf375b685aeea20c6b0ed8600cd6edfe.zip | |
x86, irq: get nr_irqs from madt
Until now, NR_IRQS was derived from black magic defines that had to
be "large enough" to both accomodate NR_CPUS and MAX_NR_IO_APICs.
This resulted in a way too large irq_desc[] array on most x86 systems.
Especially with larger CPU masks, the size of irq_desc can spiral out
of control quickly.
So be smarter about it and use precise allocation instead: determine the
default maximum possible IRQ number from the ACPI MADT. Use a minimum limit
of at least 32 IRQs for broken BIOSes.
Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/asm-x86')
| -rw-r--r-- | include/asm-x86/mpspec.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/asm-x86/mpspec.h b/include/asm-x86/mpspec.h index be2241a818f1..a0748021250b 100644 --- a/include/asm-x86/mpspec.h +++ b/include/asm-x86/mpspec.h @@ -60,6 +60,7 @@ extern void mp_override_legacy_irq(u8 bus_irq, u8 polarity, u8 trigger, u32 gsi); extern void mp_config_acpi_legacy_irqs(void); extern int mp_register_gsi(u32 gsi, int edge_level, int active_high_low); +extern int get_nr_irqs_via_madt(void); #ifdef CONFIG_X86_IO_APIC extern int mp_config_acpi_gsi(unsigned char number, unsigned int devfn, u8 pin, u32 gsi, int triggering, int polarity); |