linux-kernel - [PATCH] perf: Extend attr check to allow also dynamically generated

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Date:	Tue, 5 Jul 2011 11:47:14 +0200
From:	Robert Richter <robert.richter@....com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
CC:	Paul Mackerras <paulus@...ba.org>, Ingo Molnar <mingo@...e.hu>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH] perf: Extend attr check to allow also dynamically generated

On 04.07.11 19:59:27, Robert Richter wrote:
> (Btw, current kernel code does not support dynamically allocated pmu
> types due to a check in perf_copy_attr():
> 
>         if (attr->type >= PERF_TYPE_MAX)
>                 return -EINVAL;
> )

Below a fix for this.

-Robert


>From 63e76c3d827e3d6d24ff4ee24854523c054c7179 Mon Sep 17 00:00:00 2001
From: Robert Richter <robert.richter@....com>
Date: Tue, 5 Jul 2011 11:04:39 +0200
Subject: [PATCH] perf: Extend attr check to allow also dynamically generated
 types

When attaching events to a pmu with generated type, the initialization
fails. Extending the check to allow such types.

Signed-off-by: Robert Richter <robert.richter@....com>
---
 kernel/events/core.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/kernel/events/core.c b/kernel/events/core.c
index cca3588..5900729 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -5958,7 +5958,7 @@ static int perf_copy_attr(struct perf_event_attr __user *uattr,
 	 * If the type exists, the corresponding creation will verify
 	 * the attr->config.
 	 */
-	if (attr->type >= PERF_TYPE_MAX)
+	if (attr->type >= PERF_TYPE_MAX && !idr_find(&pmu_idr, attr->type))
 		return -EINVAL;
 
 	if (attr->__reserved_1)
-- 
1.7.5.3




-- 
Advanced Micro Devices, Inc.
Operating System Research Center

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