[PATCH v15 1/3] /proc/pid/status: Add support for architecture specific output

From: Aubrey Li
Date: Tue Apr 16 2019 - 02:35:05 EST

The architecture specific information of the running processes could
be useful to the userland. Add support to examine process architecture
specific information externally.

Signed-off-by: Aubrey Li <aubrey.li@xxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Cc: Tim Chen <tim.c.chen@xxxxxxxxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxx>
Cc: Arjan van de Ven <arjan@xxxxxxxxxxxxxxx>
Cc: Linux API <linux-api@xxxxxxxxxxxxxxx>
Cc: Alexey Dobriyan <adobriyan@xxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
fs/proc/array.c | 6 ++++++
1 file changed, 6 insertions(+)

diff --git a/fs/proc/array.c b/fs/proc/array.c
index 2edbb657f859..87bc7e882d35 100644
--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -96,6 +96,11 @@
#include <asm/processor.h>
#include "internal.h"

+/* Add support for architecture specific output in /proc/pid/status */
+#ifndef arch_proc_pid_status
+#define arch_proc_pid_status(m, task)
void proc_task_name(struct seq_file *m, struct task_struct *p, bool escape)
char *buf;
@@ -424,6 +429,7 @@ int proc_pid_status(struct seq_file *m, struct pid_namespace *ns,
task_cpus_allowed(m, task);
cpuset_task_status_allowed(m, task);
task_context_switch_counts(m, task);
+ arch_proc_pid_status(m, task);
return 0;