linux-kernel - [PATCH] kernel/pid: Rename `find_ge_pid` to `find_get

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Date:   Wed, 2 Sep 2020 12:23:10 +0000
From:   Harley Paterson <harley.paterson@...mail.co.nz>
To:     "christian@...uner.io" <christian@...uner.io>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH] kernel/pid: Rename `find_ge_pid` to `find_get_vpid`.

Most PID functions in `kernel/pid.c` are named in the format
[do_something]_pid, and functions with a VPID counterpart have
the corresponding name [do_something]_vpid.

`find_get_pid` and its VPID counterpart, `find_ge_pid` do not share
this convention.

This patch renames `find_ge_pid` to `find_get_vpid` to conform to the
existing PID function naming idioms. I believe the proposed name
makes the purpose of the function clearer.

I have built and tested this patch on an x64 virtual machine, running
Ubuntu 20.04 LTS. My tests involved building the modified kernel,
installing it, and booting into a Ubuntu GUI session.

This patch is applied on top of the linux-5.9-rc3 kernel

This patch effects four lines, one in each of four files.

Signed-off-by: H Paterson <harley.paterson@...mail.co.nz>
---
 fs/proc/base.c         | 2 +-
 include/linux/pid.h    | 2 +-
 kernel/bpf/task_iter.c | 2 +-
 kernel/pid.c           | 2 +-
 4 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/fs/proc/base.c b/fs/proc/base.c
index 617db4e0f..e2ff20311 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -3390,7 +3390,7 @@ static struct tgid_iter next_tgid(struct pid_namespace *ns, struct tgid_iter ite
 	rcu_read_lock();
 retry:
 	iter.task = NULL;
-	pid = find_ge_pid(iter.tgid, ns);
+	pid = find_get_vpid(iter.tgid, ns);
 	if (pid) {
 		iter.tgid = pid_nr_ns(pid, ns);
 		iter.task = pid_task(pid, PIDTYPE_TGID);
diff --git a/include/linux/pid.h b/include/linux/pid.h
index 176d6cf80..2875b4189 100644
--- a/include/linux/pid.h
+++ b/include/linux/pid.h
@@ -128,7 +128,7 @@ extern struct pid *find_vpid(int nr);
  * Lookup a PID in the hash table, and return with it's count elevated.
  */
 extern struct pid *find_get_pid(int nr);
-extern struct pid *find_ge_pid(int nr, struct pid_namespace *);
+extern struct pid *find_get_vpid(int nr, struct pid_namespace *);

 extern struct pid *alloc_pid(struct pid_namespace *ns, pid_t *set_tid,
 			     size_t set_tid_size);
diff --git a/kernel/bpf/task_iter.c b/kernel/bpf/task_iter.c
index 99af4cea1..334cb8831 100644
--- a/kernel/bpf/task_iter.c
+++ b/kernel/bpf/task_iter.c
@@ -29,7 +29,7 @@ static struct task_struct *task_seq_get_next(struct pid_namespace *ns,

 	rcu_read_lock();
 retry:
-	pid = find_ge_pid(*tid, ns);
+	pid = find_get_vpid(*tid, ns);
 	if (pid) {
 		*tid = pid_nr_ns(pid, ns);
 		task = get_pid_task(pid, PIDTYPE_PID);
diff --git a/kernel/pid.c b/kernel/pid.c
index b2562a7ce..0c77fef72 100644
--- a/kernel/pid.c
+++ b/kernel/pid.c
@@ -514,7 +514,7 @@ EXPORT_SYMBOL_GPL(task_active_pid_ns);
  *
  * If there is a pid at nr this function is exactly the same as find_pid_ns.
  */
-struct pid *find_ge_pid(int nr, struct pid_namespace *ns)
+struct pid *find_get_vpid(int nr, struct pid_namespace *ns)
 {
 	return idr_get_next(&ns->idr, &nr);
 }
-- 
2.25.1