linux-kernel - [PATCH 3.19 136/175] kdb: Fix off by one error in kdb

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Message-Id: <20150304061048.446624845@linuxfoundation.org>
Date:	Tue,  3 Mar 2015 22:15:14 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org,
	Daniel Thompson <daniel.thompson@...aro.org>,
	Jason Wessel <jason.wessel@...driver.com>
Subject: [PATCH 3.19 136/175] kdb: Fix off by one error in kdb_cpu()

3.19-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jason Wessel <jason.wessel@...driver.com>

commit df0036d117e6c9df36324e517728e33543065f9a upstream.

There was a follow on replacement patch against the prior
"kgdb: Timeout if secondary CPUs ignore the roundup".

See: https://lkml.org/lkml/2015/1/7/442

This patch is the delta vs the patch that was committed upstream:
  * Fix an off-by-one error in kdb_cpu().
  * Replace NR_CPUS with CONFIG_NR_CPUS to tell checkpatch that we
    really want a static limit.
  * Removed the "KGDB: " prefix from the pr_crit() in debug_core.c
    (kgdb-next contains a patch which introduced pr_fmt() to this file
    to the tag will now be applied automatically).

Cc: Daniel Thompson <daniel.thompson@...aro.org>
Signed-off-by: Jason Wessel <jason.wessel@...driver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 kernel/debug/debug_core.c   |    2 +-
 kernel/debug/kdb/kdb_main.c |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

--- a/kernel/debug/debug_core.c
+++ b/kernel/debug/debug_core.c
@@ -604,7 +604,7 @@ return_normal:
 		   online_cpus)
 		cpu_relax();
 	if (!time_left)
-		pr_crit("KGDB: Timed out waiting for secondary CPUs.\n");
+		pr_crit("Timed out waiting for secondary CPUs.\n");
 
 	/*
 	 * At this point the primary processor is completely
--- a/kernel/debug/kdb/kdb_main.c
+++ b/kernel/debug/kdb/kdb_main.c
@@ -2256,7 +2256,7 @@ static int kdb_cpu(int argc, const char
 	/*
 	 * Validate cpunum
 	 */
-	if ((cpunum > NR_CPUS) || !kgdb_info[cpunum].enter_kgdb)
+	if ((cpunum >= CONFIG_NR_CPUS) || !kgdb_info[cpunum].enter_kgdb)
 		return KDB_BADCPUNUM;
 
 	dbg_switch_cpu = cpunum;


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