linux-kernel - [PATCH v5 17/20] scripts/gdb: Add lx

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Message-Id: <d33aed5e89cfb715115c08b4677d567e6eadee22.1359463075.git.jan.kiszka@siemens.com>
Date:	Tue, 29 Jan 2013 13:38:00 +0100
From:	Jan Kiszka <jan.kiszka@...mens.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Cc:	Jason Wessel <jason.wessel@...driver.com>,
	kgdb-bugreport@...ts.sourceforge.net,
	Andi Kleen <andi@...stfloor.org>,
	Tom Tromey <tromey@...hat.com>,
	Ben Widawsky <ben@...dawsk.net>, Borislav Petkov <bp@...en8.de>
Subject: [PATCH v5 17/20] scripts/gdb: Add lx_current convenience function

This is a shorthand for *$lx_per_cpu("current_task"), i.e. a convenience
function to retrieve the currently running task of the active context.

Signed-off-by: Jan Kiszka <jan.kiszka@...mens.com>
---
 scripts/gdb/percpu.py |   16 ++++++++++++++++
 1 files changed, 16 insertions(+), 0 deletions(-)

diff --git a/scripts/gdb/percpu.py b/scripts/gdb/percpu.py
index 864962c..4dab8d3 100644
--- a/scripts/gdb/percpu.py
+++ b/scripts/gdb/percpu.py
@@ -59,3 +59,19 @@ class PerCpu(gdb.Function):
 		return per_cpu(var_ptr, cpu)
 
 PerCpu()
+
+
+class LxCurrentFunc(gdb.Function):
+	__doc__ = "Return current task.\n" \
+		  "\n" \
+		  "$lx_current([CPU]): Return the per-cpu task variable for the given CPU\n" \
+		  "number. If CPU is omitted, the CPU of the current context is used."
+
+	def __init__(self):
+		super(LxCurrentFunc, self).__init__("lx_current")
+
+	def invoke(self, cpu = -1):
+		var_ptr = gdb.parse_and_eval("&current_task")
+		return per_cpu(var_ptr, cpu).dereference()
+
+LxCurrentFunc()
-- 
1.7.3.4

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