netdev - [PATCH 16/26] [media] i2c: adv7604: mark register access as noinline_for

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Message-Id: <20170302163834.2273519-17-arnd@arndb.de>
Date:   Thu,  2 Mar 2017 17:38:24 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     kasan-dev@...glegroups.com
Cc:     Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
        linux-wireless@...r.kernel.org,
        kernel-build-reports@...ts.linaro.org,
        "David S . Miller" <davem@...emloft.net>,
        Arnd Bergmann <arnd@...db.de>
Subject: [PATCH 16/26] [media] i2c: adv7604: mark register access as noinline_for_kasan

When building with KASAN, we get a stack frame size warning about a function
that could potentially cause a stack overflow:

drivers/media/i2c/adv7604.c: In function 'adv76xx_log_status':
drivers/media/i2c/adv7604.c:2615:1: error: the frame size of 3248 bytes is larger than 3072 bytes [-Werror=frame-larger-than=]

This is caused by adv76xx_read_check() being inlined repeatedly, and
marking this function as noinline_for_kasan solves the problem
completely.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/media/i2c/adv7604.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/media/i2c/adv7604.c b/drivers/media/i2c/adv7604.c
index d8bf435db86d..176f46ac85fd 100644
--- a/drivers/media/i2c/adv7604.c
+++ b/drivers/media/i2c/adv7604.c
@@ -339,8 +339,8 @@ static inline unsigned vtotal(const struct v4l2_bt_timings *t)
 
 /* ----------------------------------------------------------------------- */
 
-static int adv76xx_read_check(struct adv76xx_state *state,
-			     int client_page, u8 reg)
+static noinline_for_kasan int adv76xx_read_check(struct adv76xx_state *state,
+						 int client_page, u8 reg)
 {
 	struct i2c_client *client = state->i2c_clients[client_page];
 	int err;
-- 
2.9.0