[Crash-utility] [PATCH] cmdline: Add a new "--machdep stacksize=<value>".

[Sean Fu]

Implemented support for 16k stack size that was introduced by commit
6538b8ea886e472f4431db8ca1d60478f838d14b titled "x86_64: expand kernel
stack to 16K".
Without the patch, kernels has 16k stack, leading to errors in commands
such as "bt" and any command regarding 8K stack.
Add a new "--machdep stacksize=<value>" option that can be used to
override the default machdep->stacksize value which is 8k.

Signed-off-by: Sean Fu <fxinrong at gmail.com>
---
 x86_64.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/x86_64.c b/x86_64.c
index 7d01140..1798f05 100644
--- a/x86_64.c
+++ b/x86_64.c
@@ -5716,6 +5716,15 @@ parse_cmdline_args(void)
 						continue;
 					}
 				}
+			} else if (STRNEQ(arglist[i], "stacksize=")) {
+	                        p = arglist[i] + strlen("stacksize=");
+				if (strlen(p)) {
+					value = stol(p, RETURN_ON_ERROR|QUIET, &errflag);
+					if (!errflag) {
+						machdep->stacksize = value;
+						continue;
+					}
+				}
 			}
 	
 			error(WARNING, "ignoring --machdep option: %s\n", arglist[i]);
-- 
2.6.2