linux-kernel - [raw v1 3/4] Use raw_cpu_write for initialization of per cpu refcount.

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-ID: <0000014194317db2-c89f8992-7778-40d4-bb66-b2be41e675b2-000000@email.amazonses.com>
Date:	Mon, 7 Oct 2013 18:32:53 +0000
From:	Christoph Lameter <cl@...ux.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>
Subject: [raw v1 3/4] Use raw_cpu_write for initialization of per cpu refcount.

The initialization of a structure is not subject to synchronization.
So simply disable the check.

Cc: Rusty Russell <rusty@...tcorp.com.au>
Signed-off-by: Christoph Lameter <cl@...ux.com>

Index: linux/kernel/module.c
===================================================================
--- linux.orig/kernel/module.c	2013-09-05 13:43:30.557687773 -0500
+++ linux/kernel/module.c	2013-10-07 12:33:43.732059759 -0500
@@ -643,7 +643,7 @@ static int module_unload_init(struct mod
 	INIT_LIST_HEAD(&mod->target_list);

 	/* Hold reference count during initialization. */
-	__this_cpu_write(mod->refptr->incs, 1);
+	raw_cpu_write(mod->refptr->incs, 1);
 	/* Backwards compatibility macros put refcount during init. */
 	mod->waiter = current;

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/