linux-kernel - [PATCH] regulator/tps6586x: silence pointer-to-int-cast

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Date:	Wed, 22 Jul 2015 18:23:26 +0800
From:	Daniel Kurtz <djkurtz@...omium.org>
To:	unlisted-recipients:; (no To-header on input)
Cc:	Daniel Kurtz <djkurtz@...omium.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>,
	linux-kernel@...r.kernel.org (open list:VOLTAGE AND CURRENT REGULATOR
	FRAMEWORK)
Subject: [PATCH] regulator/tps6586x: silence pointer-to-int-cast

of_regulator_match.driver_data is (void *).  tps6586x uses it to store an
anonymous enum value (those TPS6586X_ID_ values).

Later, it tries to extract the ID by casting directly to an int, which is a
no-no ([-Wpointer-to-int-cast]):

drivers/regulator/tps6586x-regulator.c: In function 'tps6586x_parse_regulator_dt':
drivers/regulator/tps6586x-regulator.c:430:8: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
   id = (int)tps6586x_matches[i].driver_data;
        ^

Instead of casting to int, uintptr_t is better suited for receiving and
comparing integers extracted from void *.  This is especially true on
64-bit systems where sizeof(void *) != sizeof(int).

Signed-off-by: Daniel Kurtz <djkurtz@...omium.org>
---
 drivers/regulator/tps6586x-regulator.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/regulator/tps6586x-regulator.c b/drivers/regulator/tps6586x-regulator.c
index 2852de0..9e9d220 100644
--- a/drivers/regulator/tps6586x-regulator.c
+++ b/drivers/regulator/tps6586x-regulator.c
@@ -422,12 +422,12 @@ static struct tps6586x_platform_data *tps6586x_parse_regulator_dt(
 		return NULL;
 
 	for (i = 0; i < num; i++) {
-		int id;
+		uintptr_t id;
 		if (!tps6586x_matches[i].init_data)
 			continue;
 
 		pdata->reg_init_data[i] = tps6586x_matches[i].init_data;
-		id = (int)tps6586x_matches[i].driver_data;
+		id = (uintptr_t)tps6586x_matches[i].driver_data;
 		if (id == TPS6586X_ID_SYS)
 			sys_rail = pdata->reg_init_data[i]->constraints.name;
 
-- 
2.4.3.573.g4eafbef

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