From: Catalin Marinas <catalin.marinas@arm.com>
Date: Mon, 29 Jun 2009 16:13:55 +0000 (+0100)
Subject: kmemleak: Inform kmemleak about pid_hash
X-Git-Tag: Ubuntu-5.0.0-8.9~26822^2
X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=12de38b186c2af97bf0b4a1f907f766df46b1def;p=mirror_ubuntu-disco-kernel.git

kmemleak: Inform kmemleak about pid_hash

Kmemleak does not track alloc_bootmem calls but the pid_hash allocated
in pidhash_init() would need to be scanned as it contains pointers to
struct pid objects.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
---

diff --git a/kernel/pid.c b/kernel/pid.c
index 31310b5d3f50..5fa1db48d8b7 100644
--- a/kernel/pid.c
+++ b/kernel/pid.c
@@ -36,6 +36,7 @@
 #include <linux/pid_namespace.h>
 #include <linux/init_task.h>
 #include <linux/syscalls.h>
+#include <linux/kmemleak.h>
 
 #define pid_hashfn(nr, ns)	\
 	hash_long((unsigned long)nr + (unsigned long)ns, pidhash_shift)
@@ -512,6 +513,12 @@ void __init pidhash_init(void)
 	pid_hash = alloc_bootmem(pidhash_size *	sizeof(*(pid_hash)));
 	if (!pid_hash)
 		panic("Could not alloc pidhash!\n");
+	/*
+	 * pid_hash contains references to allocated struct pid objects and it
+	 * must be scanned by kmemleak to avoid false positives.
+	 */
+	kmemleak_alloc(pid_hash, pidhash_size *	sizeof(*(pid_hash)), 0,
+		       GFP_KERNEL);
 	for (i = 0; i < pidhash_size; i++)
 		INIT_HLIST_HEAD(&pid_hash[i]);
 }