github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-05-28 00:53:34 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

MIPS: loongson64: Override arch_dynirq_lower_bound to reserve LPC IRQs

Browse Source 
On some Loongson 3A devices, a LPC bus is present and some legacy devices
(e.g. 8259) on it expect hardcoded low interrupt numbers. However currently
the expected low range interrupt numbers are not exempted from the dynamic
allocation, which leads to conflicts when registering LPC interrupts in the
fixed range.

Override arch_dynirq_lower_bound() to reserve these low range interrupt
numbers and prevent them from being dynamically allocated.

Signed-off-by: Icenowy Zheng <zhengxingda@iscas.ac.cn>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Reviewed-by: Huacai Chen <chenhuacai@loongson.cn>
Link: https://patch.msgid.link/20260321092032.3502701-2-zhengxingda@iscas.ac.cn
This commit is contained in:
Icenowy Zheng 2026-03-21 17:20:27 +08:00 committed by Thomas Gleixner
parent 87c6dfe308
commit 57c9c7bf52
1 changed files with 6 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
arch/mips/loongson64/init.c
View File

@ -7,6 +7,7 @@
#include <linux/irqchip.h>
#include <linux/logic_pio.h>
#include <linux/memblock.h>
#include <linux/minmax.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <asm/bootinfo.h>
@ -227,3 +228,8 @@ void __init arch_init_irq(void)
reserve_pio_range();
irqchip_init();
}
unsigned int arch_dynirq_lower_bound(unsigned int from)
{
return MAX(from, NR_IRQS_LEGACY);
}