[PATCH] kdump: add dmesg gdbmacro into document
Add gdb macro which print the kernel ring buffer into kdump docs
Signed-off-by: Akinobu Mita <mita@miraclelinux.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/Documentation/kdump/gdbmacros.txt b/Documentation/kdump/gdbmacros.txt
index bc1b9eb..dcf5580 100644
--- a/Documentation/kdump/gdbmacros.txt
+++ b/Documentation/kdump/gdbmacros.txt
@@ -177,3 +177,25 @@
'trapinfo <pid>' will tell you by which trap & possibly
addresthe kernel paniced.
end
+
+
+define dmesg
+ set $i = 0
+ set $end_idx = (log_end - 1) & (log_buf_len - 1)
+
+ while ($i < logged_chars)
+ set $idx = (log_end - 1 - logged_chars + $i) & (log_buf_len - 1)
+
+ if ($idx + 100 <= $end_idx) || \
+ ($end_idx <= $idx && $idx + 100 < log_buf_len)
+ printf "%.100s", &log_buf[$idx]
+ set $i = $i + 100
+ else
+ printf "%c", log_buf[$idx]
+ set $i = $i + 1
+ end
+ end
+end
+document dmesg
+ print the kernel ring buffer
+end
