printk: "support" some modifier codes

We now allow modifier codes h, l, and z, although at the
moment they are simply dropped. This is to allow us to warn on
incorrect printk() usage by the compiler. These arguments get
promoted to int when they are passed as arguments so this
may never need to be addressed, although there may be implications
for (future) support for systems with 16-bit integers.
We still don't print 64-bit integers properly. but this is
nothing new.

Change-Id: I112d1257c4ec70c3fa7ae65dc56a6076ff29a8c0
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>

1 files changed, 6 insertions, 1 deletions

diff --git a/misc/printk.c b/misc/printk.c
index 4b681939c..2ac2b4fdc 100644
--- a/misc/printk.c
+++ b/misc/printk.c
@@ -85,6 +85,11 @@ static inline void _vprintk(const char *fmt, va_list ap)
 			}
 		} else {
 			switch (*fmt) {
+			case 'z':
+			case 'l':
+			case 'h':
+				/* FIXME: do nothing for these modifiers */
+				goto still_might_format;
 			case 'd':
 			case 'i': {
 				long d = va_arg(ap, long);
@@ -134,7 +139,7 @@ static inline void _vprintk(const char *fmt, va_list ap)
 			}
 			might_format = 0;
 		}
-
+still_might_format:
 		++fmt;
 	}
 }