threeeye
bc1d038eac
Squashed backup commit (no shallow-clone history issues) of xiaomi-mt6833-dev/kernel_xiaomi_mt6833 (lineage-23.2 branch, upstream commit 9eece662e) plus all fixes applied to get everpal_defconfig building clean against a modern (GCC 15.2.0) toolchain -- see the previous commit message on the lineage-23.2 branch (also in this repo history is not available here since this is a squashed snapshot; full incremental history lives in the local DL380 checkout and the upstream GitHub remote). Upstream: https://github.com/xiaomi-mt6833-dev/kernel_xiaomi_mt6833 (lineage-23.2)
49 lines
919 B
C
49 lines
919 B
C
/*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*/
|
|
#include <linux/init.h>
|
|
#include <linux/irq.h>
|
|
#include <linux/types.h>
|
|
|
|
#include <asm/barrier.h>
|
|
|
|
static DECLARE_BITMAP(irq_map, NR_IRQS);
|
|
|
|
int allocate_irqno(void)
|
|
{
|
|
int irq;
|
|
|
|
again:
|
|
irq = find_first_zero_bit(irq_map, NR_IRQS);
|
|
|
|
if (irq >= NR_IRQS)
|
|
return -ENOSPC;
|
|
|
|
if (test_and_set_bit(irq, irq_map))
|
|
goto again;
|
|
|
|
return irq;
|
|
}
|
|
|
|
/*
|
|
* Allocate the 16 legacy interrupts for i8259 devices. This happens early
|
|
* in the kernel initialization so treating allocation failure as BUG() is
|
|
* ok.
|
|
*/
|
|
void __init alloc_legacy_irqno(void)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i <= 16; i++)
|
|
BUG_ON(test_and_set_bit(i, irq_map));
|
|
}
|
|
|
|
void free_irqno(unsigned int irq)
|
|
{
|
|
smp_mb__before_atomic();
|
|
clear_bit(irq, irq_map);
|
|
smp_mb__after_atomic();
|
|
}
|