linux-kernel - [PATCH v5 07/11] vsprintf: Factor out %pV handler as va

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Date:   Wed, 25 Apr 2018 13:12:47 +0200
From:   Petr Mladek <pmladek@...e.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        "Tobin C . Harding" <me@...in.cc>, Joe Perches <joe@...ches.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...e.cz>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        linux-kernel@...r.kernel.org, Petr Mladek <pmladek@...e.com>
Subject: [PATCH v5 07/11] vsprintf: Factor out %pV handler as va_format()

Move the code from the long pointer() function. We are going to add a check
for the access to the address that will make it even more complicated.

This patch does not change the existing behavior.

Signed-off-by: Petr Mladek <pmladek@...e.com>
---
 lib/vsprintf.c | 22 +++++++++++++---------
 1 file changed, 13 insertions(+), 9 deletions(-)

diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index 92793060bb1f..e58436ef9f7f 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -1479,6 +1479,18 @@ char *escaped_string(char *buf, char *end, u8 *addr, struct printf_spec spec,
 	return buf;
 }
 
+static char *va_format(char *buf, char *end, struct va_format *va_fmt)
+{
+	va_list va;
+
+	va_copy(va, *va_fmt->va);
+	buf += vsnprintf(buf, end > buf ? end - buf : 0,
+			 va_fmt->fmt, va);
+	va_end(va);
+
+	return buf;
+}
+
 static noinline_for_stack
 char *uuid_string(char *buf, char *end, const u8 *addr,
 		  struct printf_spec spec, const char *fmt)
@@ -1927,15 +1939,7 @@ char *pointer(const char *fmt, char *buf, char *end, void *ptr,
 	case 'U':
 		return uuid_string(buf, end, ptr, spec, fmt);
 	case 'V':
-		{
-			va_list va;
-
-			va_copy(va, *((struct va_format *)ptr)->va);
-			buf += vsnprintf(buf, end > buf ? end - buf : 0,
-					 ((struct va_format *)ptr)->fmt, va);
-			va_end(va);
-			return buf;
-		}
+		return va_format(buf, end, ptr);
 	case 'K':
 		return restricted_pointer(buf, end, ptr, spec);
 	case 'N':
-- 
2.13.6