linux-kernel - [PATCH 3/4] pid.c: Replace pidhash lookup with idr

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Date:   Mon, 25 Sep 2017 08:56:17 -0400
From:   Gargi Sharma <gs051095@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     riel@...riel.com, julia.lawall@...6.fr, akpm@...ux-foundation.org,
        mingo@...nel.org, pasha.tatashin@...cle.com, ktkhai@...tuozzo.com,
        oleg@...hat.com, Gargi Sharma <gs051095@...il.com>
Subject: [PATCH 3/4] pid.c: Replace pidhash lookup with idr_get()

pidhash is no longer required as all the functionalities
are present in the idr tree associated with the namespace.
nr can be looked up in the namespace by idr_get().

Signed-off-by: Gargi Sharma <gs051095@...il.com>
---
 kernel/pid.c | 10 +---------
 1 file changed, 1 insertion(+), 9 deletions(-)

diff --git a/kernel/pid.c b/kernel/pid.c
index ea22e89..761a0c2 100644
--- a/kernel/pid.c
+++ b/kernel/pid.c
@@ -247,15 +247,7 @@ void disable_pid_allocation(struct pid_namespace *ns)
 
 struct pid *find_pid_ns(int nr, struct pid_namespace *ns)
 {
-	struct upid *pnr;
-
-	hlist_for_each_entry_rcu(pnr,
-			&pid_hash[pid_hashfn(nr, ns)], pid_chain)
-		if (pnr->nr == nr && pnr->ns == ns)
-			return container_of(pnr, struct pid,
-					numbers[ns->level]);
-
-	return NULL;
+	return idr_get(&ns->idr, &nr);
 }
 EXPORT_SYMBOL_GPL(find_pid_ns);
 
-- 
2.7.4