Add gdb macro which print the kernel ring buffer into kdump docs

Signed-off-by: Akinobu Mita <[EMAIL PROTECTED]>

--- 2.6/Documentation/kdump/gdbmacros.txt.orig  2006-01-06 10:47:06.000000000 
+0900
+++ 2.6/Documentation/kdump/gdbmacros.txt       2006-01-06 10:47:46.000000000 
+0900
@@ -177,3 +177,25 @@ document trapinfo
        '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
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