linux-kernel - [PATCH 2/3] fs/proc/array: Add Syscall User Dispatch to proc status

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Message-Id: <20230109153348.5625-3-gregory.price@memverge.com>
Date:   Mon,  9 Jan 2023 10:33:47 -0500
From:   Gregory Price <gourry.memverge@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     linux-fsdevel@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-kselftest@...r.kernel.org, krisman@...labora.com,
        tglx@...utronix.de, luto@...nel.org, oleg@...hat.com,
        peterz@...radead.org, ebiederm@...ssion.com,
        akpm@...ux-foundation.org, adobriyan@...il.com, corbet@....net,
        shuah@...nel.org, Gregory Price <gregory.price@...verge.com>
Subject: [PATCH 2/3] fs/proc/array: Add Syscall User Dispatch to proc status

If a dispatch selector has been configured for Syscall User Dispatch,
report Syscall User Dispath as configured in proc/status.

This provides an indicator to userland checkpoint/restart software that
it must manage special signal conditions (similar to SECCOMP)

Signed-off-by: Gregory Price <gregory.price@...verge.com>
---
 fs/proc/array.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/fs/proc/array.c b/fs/proc/array.c
index 49283b8103c7..c85cdb4c137c 100644
--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -428,6 +428,13 @@ static inline void task_thp_status(struct seq_file *m, struct mm_struct *mm)
 	seq_printf(m, "THP_enabled:\t%d\n", thp_enabled);
 }
 
+static inline void task_syscall_user_dispatch(struct seq_file *m,
+						struct task_struct *p)
+{
+	seq_put_decimal_ull(m, "\nSyscall_user_dispatch:\t",
+			    (p->syscall_dispatch.selector != NULL));
+}
+
 int proc_pid_status(struct seq_file *m, struct pid_namespace *ns,
 			struct pid *pid, struct task_struct *task)
 {
@@ -451,6 +458,7 @@ 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);
+	task_syscall_user_dispatch(m, task);
 	return 0;
 }
 
-- 
2.37.3