linux-kernel - [PATCH 16/18] scripts/gdb: Fix issue with dmesg.py and python 3.X

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Date:	Tue, 10 May 2016 09:39:41 +0200
From:	Jan Kiszka <jan.kiszka@...mens.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, Dom Cote <buzdelabuz2+git@...il.com>
Subject: [PATCH 16/18] scripts/gdb: Fix issue with dmesg.py and python 3.X

From: Dom Cote <buzdelabuz2+git@...il.com>

When built against Python 3, GDB differs in the return type for its
read_memory function, causing the lx-dmesg command to fail.

Now that we have an improved read_16() we can use the new read_memoryview()
abstraction to make lx-dmesg return valid data on both current Python APIs

Tested with python 3.4 and 2.7
Tested with gdb 7.7

Signed-off-by: Dom Cote <buzdelabuz2+git@...il.com>
[Kieran: Adjusted commit log to better reflect code changes]
Tested-by: Kieran Bingham <kieran@...gham.xyz> (Py2.7,Py3.4,GDB10)
Signed-off-by: Kieran Bingham <kieran@...gham.xyz>
Signed-off-by: Jan Kiszka <jan.kiszka@...mens.com>
---
 scripts/gdb/linux/dmesg.py | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/scripts/gdb/linux/dmesg.py b/scripts/gdb/linux/dmesg.py
index 927d0d2..04d6719 100644
--- a/scripts/gdb/linux/dmesg.py
+++ b/scripts/gdb/linux/dmesg.py
@@ -33,11 +33,12 @@ class LxDmesg(gdb.Command):
         if log_first_idx < log_next_idx:
             log_buf_2nd_half = -1
             length = log_next_idx - log_first_idx
-            log_buf = inf.read_memory(start, length)
+            log_buf = utils.read_memoryview(inf, start, length).tobytes()
         else:
             log_buf_2nd_half = log_buf_len - log_first_idx
-            log_buf = inf.read_memory(start, log_buf_2nd_half) + \
-                inf.read_memory(log_buf_addr, log_next_idx)
+            a = utils.read_memoryview(inf, start, log_buf_2nd_half)
+            b = utils.read_memoryview(inf, log_buf_addr, log_next_idx)
+            log_buf = a.tobytes() + b.tobytes()
 
         pos = 0
         while pos < log_buf.__len__():
-- 
2.1.4