linux-kernel - [PATCH v1 4/7] lib/vsprintf: Remove useless NULL checks

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Date:   Fri, 16 Feb 2018 21:28:03 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     "Tobin C. Harding" <me@...in.cc>, linux@...musvillemoes.dk,
        Petr Mladek <pmladek@...e.com>, Joe Perches <joe@...ches.com>,
        linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: [PATCH v1 4/7] lib/vsprintf: Remove useless NULL checks

The pointer can't be NULL since it's first what has been done in the
pointer().

Remove useless checks.

Note we leave check for !CONFIG_HAVE_CLK to make compiler
to optimize code away when possible.

Cc: Petr Mladek <pmladek@...e.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 lib/vsprintf.c | 13 +------------
 1 file changed, 1 insertion(+), 12 deletions(-)

diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index 360e751305bf..79f27ebdeb6e 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -813,10 +813,6 @@ char *hex_string(char *buf, char *end, u8 *addr, struct printf_spec spec,
 		/* nothing to print */
 		return buf;
 
-	if (ZERO_OR_NULL_PTR(addr))
-		/* NULL pointer */
-		return string(buf, end, NULL, spec);
-
 	switch (fmt[1]) {
 	case 'C':
 		separator = ':';
@@ -1255,10 +1251,6 @@ char *escaped_string(char *buf, char *end, u8 *addr, struct printf_spec spec,
 	if (spec.field_width == 0)
 		return buf;				/* nothing to print */
 
-	if (ZERO_OR_NULL_PTR(addr))
-		return string(buf, end, NULL, spec);	/* NULL pointer */
-
-
 	do {
 		switch (fmt[count++]) {
 		case 'a':
@@ -1442,7 +1434,7 @@ static noinline_for_stack
 char *clock(char *buf, char *end, struct clk *clk, struct printf_spec spec,
 	    const char *fmt)
 {
-	if (!IS_ENABLED(CONFIG_HAVE_CLK) || !clk)
+	if (!IS_ENABLED(CONFIG_HAVE_CLK))
 		return string(buf, end, NULL, spec);
 
 	switch (fmt[1]) {
@@ -1581,9 +1573,6 @@ char *device_node_string(char *buf, char *end, struct device_node *dn,
 	if (!IS_ENABLED(CONFIG_OF))
 		return string(buf, end, "(!OF)", spec);
 
-	if ((unsigned long)dn < PAGE_SIZE)
-		return string(buf, end, "(null)", spec);
-
 	/* simple case without anything any more format specifiers */
 	fmt++;
 	if (fmt[0] == '\0' || strcspn(fmt,"fnpPFcC") > 0)
-- 
2.15.1