diff options
| author | Daniel Thompson <daniel.thompson@linaro.org> | 2014-08-19 15:37:41 +0100 |
|---|---|---|
| committer | Daniel Thompson <daniel.thompson@linaro.org> | 2022-04-13 17:22:53 +0100 |
| commit | b58798cd87e95bdb8832940ba312ce920de71613 (patch) | |
| tree | 580d11e891aafe925eb514f1b92aef2ffde4bb7e | |
| parent | 4f886ca3243fd3ede50a2064c548aa6a5ef5a65e (diff) | |
proc: Provide access to /proc/interrupts from kdbkdb/seq_file
The contents of /proc/interrupts is useful to diagnose problems during
boot up or when the system becomes unresponsive (or at least it can be if
failure is causes by interrupt problems). This command is also seen in
out-of-tree debug systems such as Android's FIQ debugger.
This change allows the file to be displayed from kdb.
Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>
| -rw-r--r-- | fs/proc/interrupts.c | 4 | ||||
| -rw-r--r-- | kernel/irq/proc.c | 7 |
2 files changed, 10 insertions, 1 deletions
diff --git a/fs/proc/interrupts.c b/fs/proc/interrupts.c index cb0edc7cbf09..1ab4e4b1c28b 100644 --- a/fs/proc/interrupts.c +++ b/fs/proc/interrupts.c @@ -5,6 +5,7 @@ #include <linux/irqnr.h> #include <linux/proc_fs.h> #include <linux/seq_file.h> +#include <linux/kdb.h> /* * /proc/interrupts @@ -34,9 +35,12 @@ static const struct seq_operations int_seq_ops = { .show = show_interrupts }; +DEFINE_KDB_SEQ_FILE(interrupts, "Show /proc/interrupts", &int_seq_ops) + static int __init proc_interrupts_init(void) { proc_create_seq("interrupts", 0, NULL, &int_seq_ops); + register_kdb_seq_file_interrupts(); return 0; } fs_initcall(proc_interrupts_init); diff --git a/kernel/irq/proc.c b/kernel/irq/proc.c index 623b8136e9af..3fa735257b03 100644 --- a/kernel/irq/proc.c +++ b/kernel/irq/proc.c @@ -12,6 +12,7 @@ #include <linux/interrupt.h> #include <linux/kernel_stat.h> #include <linux/mutex.h> +#include <linux/kgdb.h> #include "internals.h" @@ -501,7 +502,11 @@ int show_interrupts(struct seq_file *p, void *v) seq_printf(p, "%10u ", desc->kstat_irqs ? *per_cpu_ptr(desc->kstat_irqs, j) : 0); - raw_spin_lock_irqsave(&desc->lock, flags); + if (!raw_spin_lock_irqsave_dbg(&desc->lock, flags)) { + seq_printf(p, " <descriptor is locked>\n"); + goto outsparse; + } + if (desc->irq_data.chip) { if (desc->irq_data.chip->irq_print_chip) desc->irq_data.chip->irq_print_chip(&desc->irq_data, p); |