linux-kernel - [PATCH] util_macros.h: Have array pointer point to array of constants

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Message-Id: <1430158345-14297-1-git-send-email-linux@roeck-us.net>
Date:	Mon, 27 Apr 2015 11:12:25 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, Guenter Roeck <linux@...ck-us.net>,
	Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: [PATCH] util_macros.h: Have array pointer point to array of constants

Using the new find_closest() macro can result in the following sparse
warnings.

drivers/hwmon/lm85.c:194:16: warning:
		incorrect type in initializer (different modifiers)
drivers/hwmon/lm85.c:194:16:    expected int *__fc_a
drivers/hwmon/lm85.c:194:16:    got int static const [toplevel] *<noident>
drivers/hwmon/lm85.c:210:16: warning:
		incorrect type in initializer (different modifiers)
drivers/hwmon/lm85.c:210:16:    expected int *__fc_a
drivers/hwmon/lm85.c:210:16:    got int const *map

This is because the array passed to find_closest() will typically be
declared as array of constants, but the macro declares a non-constant
pointer to it.

Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Bartosz Golaszewski <bgolaszewski@...libre.com>
Signed-off-by: Guenter Roeck <linux@...ck-us.net>
---
 include/linux/util_macros.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/util_macros.h b/include/linux/util_macros.h
index d5f4fb69dba3..f9b2ce58039b 100644
--- a/include/linux/util_macros.h
+++ b/include/linux/util_macros.h
@@ -5,7 +5,7 @@
 ({									\
 	typeof(as) __fc_i, __fc_as = (as) - 1;				\
 	typeof(x) __fc_x = (x);						\
-	typeof(*a) *__fc_a = (a);					\
+	typeof(*a) const *__fc_a = (a);					\
 	for (__fc_i = 0; __fc_i < __fc_as; __fc_i++) {			\
 		if (__fc_x op DIV_ROUND_CLOSEST(__fc_a[__fc_i] +	\
 						__fc_a[__fc_i + 1], 2))	\
-- 
2.1.0

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