x86/boot: Pass in size to early cmdline parsing

We will use this in a few patches to implement tests for early parsing.

Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
[ Aligned args properly. ]
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: fenghua.yu@intel.com
Cc: yu-cheng.yu@intel.com
Link: http://lkml.kernel.org/r/20151222225243.5CC47EB6@viggo.jf.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

arch/x86/lib/cmdline.c

@@ -25,7 +25,9 @@ static inline int myisspace(u8 c)
  * as an entire word in @cmdline.  For instance, if @option="car"
  * then a cmdline which contains "cart" will not match.
  */
-int cmdline_find_option_bool(const char *cmdline, const char *option)
+static int
+__cmdline_find_option_bool(const char *cmdline, int max_cmdline_size,
+			   const char *option)
 {
 	char c;
 	int pos = 0, wstart = 0;
@@ -43,7 +45,7 @@ int cmdline_find_option_bool(const char *cmdline, const char *option)
 	 * This 'pos' check ensures we do not overrun
 	 * a non-NULL-terminated 'cmdline'
 	 */
-	while (pos < COMMAND_LINE_SIZE) {
+	while (pos < max_cmdline_size) {
 		c = *(char *)cmdline++;
 		pos++;
 
@@ -101,3 +103,8 @@ int cmdline_find_option_bool(const char *cmdline, const char *option)
 
 	return 0;	/* Buffer overrun */
 }
+
+int cmdline_find_option_bool(const char *cmdline, const char *option)
+{
+	return __cmdline_find_option_bool(cmdline, COMMAND_LINE_SIZE, option);
+}