mirror of
https://github.com/followmsi/android_kernel_google_msm.git
synced 2024-11-06 23:17:41 +00:00
a5c75be0e7
commit 5f35b9cd553fd64415b563497d05a563c988dbd6 upstream. Commit334c86c494("MIPS: IRQ: Add stackoverflow detection") added kernel stack overflow detection, however it only enabled it conditional upon the preprocessor definition DEBUG_STACKOVERFLOW, which is never actually defined. The Kconfig option is called DEBUG_STACKOVERFLOW, which manifests to the preprocessor as CONFIG_DEBUG_STACKOVERFLOW, so switch it to using that definition instead. Fixes:334c86c494("MIPS: IRQ: Add stackoverflow detection") Signed-off-by: James Hogan <james.hogan@imgtec.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Adam Jiang <jiang.adam@gmail.com> Cc: linux-mips@linux-mips.org Patchwork: http://patchwork.linux-mips.org/patch/10531/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org> Signed-off-by: Zefan Li <lizefan@huawei.com>
164 lines
3.3 KiB
C
164 lines
3.3 KiB
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.
|
|
*
|
|
* Code to handle x86 style IRQs plus some generic interrupt stuff.
|
|
*
|
|
* Copyright (C) 1992 Linus Torvalds
|
|
* Copyright (C) 1994 - 2000 Ralf Baechle
|
|
*/
|
|
#include <linux/kernel.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/init.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/kernel_stat.h>
|
|
#include <linux/proc_fs.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/random.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/seq_file.h>
|
|
#include <linux/kallsyms.h>
|
|
#include <linux/kgdb.h>
|
|
#include <linux/ftrace.h>
|
|
|
|
#include <linux/atomic.h>
|
|
#include <asm/uaccess.h>
|
|
|
|
#ifdef CONFIG_KGDB
|
|
int kgdb_early_setup;
|
|
#endif
|
|
|
|
static unsigned long irq_map[NR_IRQS / BITS_PER_LONG];
|
|
|
|
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_clear_bit();
|
|
clear_bit(irq, irq_map);
|
|
smp_mb__after_clear_bit();
|
|
}
|
|
|
|
/*
|
|
* 'what should we do if we get a hw irq event on an illegal vector'.
|
|
* each architecture has to answer this themselves.
|
|
*/
|
|
void ack_bad_irq(unsigned int irq)
|
|
{
|
|
smtc_im_ack_irq(irq);
|
|
printk("unexpected IRQ # %d\n", irq);
|
|
}
|
|
|
|
atomic_t irq_err_count;
|
|
|
|
int arch_show_interrupts(struct seq_file *p, int prec)
|
|
{
|
|
seq_printf(p, "%*s: %10u\n", prec, "ERR", atomic_read(&irq_err_count));
|
|
return 0;
|
|
}
|
|
|
|
asmlinkage void spurious_interrupt(void)
|
|
{
|
|
atomic_inc(&irq_err_count);
|
|
}
|
|
|
|
void __init init_IRQ(void)
|
|
{
|
|
int i;
|
|
|
|
#ifdef CONFIG_KGDB
|
|
if (kgdb_early_setup)
|
|
return;
|
|
#endif
|
|
|
|
for (i = 0; i < NR_IRQS; i++)
|
|
irq_set_noprobe(i);
|
|
|
|
arch_init_irq();
|
|
|
|
#ifdef CONFIG_KGDB
|
|
if (!kgdb_early_setup)
|
|
kgdb_early_setup = 1;
|
|
#endif
|
|
}
|
|
|
|
#ifdef CONFIG_DEBUG_STACKOVERFLOW
|
|
static inline void check_stack_overflow(void)
|
|
{
|
|
unsigned long sp;
|
|
|
|
__asm__ __volatile__("move %0, $sp" : "=r" (sp));
|
|
sp &= THREAD_MASK;
|
|
|
|
/*
|
|
* Check for stack overflow: is there less than STACK_WARN free?
|
|
* STACK_WARN is defined as 1/8 of THREAD_SIZE by default.
|
|
*/
|
|
if (unlikely(sp < (sizeof(struct thread_info) + STACK_WARN))) {
|
|
printk("do_IRQ: stack overflow: %ld\n",
|
|
sp - sizeof(struct thread_info));
|
|
dump_stack();
|
|
}
|
|
}
|
|
#else
|
|
static inline void check_stack_overflow(void) {}
|
|
#endif
|
|
|
|
|
|
/*
|
|
* do_IRQ handles all normal device IRQ's (the special
|
|
* SMP cross-CPU interrupts have their own specific
|
|
* handlers).
|
|
*/
|
|
void __irq_entry do_IRQ(unsigned int irq)
|
|
{
|
|
irq_enter();
|
|
check_stack_overflow();
|
|
if (!smtc_handle_on_other_cpu(irq))
|
|
generic_handle_irq(irq);
|
|
irq_exit();
|
|
}
|
|
|
|
#ifdef CONFIG_MIPS_MT_SMTC_IRQAFF
|
|
/*
|
|
* To avoid inefficient and in some cases pathological re-checking of
|
|
* IRQ affinity, we have this variant that skips the affinity check.
|
|
*/
|
|
|
|
void __irq_entry do_IRQ_no_affinity(unsigned int irq)
|
|
{
|
|
irq_enter();
|
|
smtc_im_backstop(irq);
|
|
generic_handle_irq(irq);
|
|
irq_exit();
|
|
}
|
|
|
|
#endif /* CONFIG_MIPS_MT_SMTC_IRQAFF */
|