netdev - [PATCH 21/26] drm/bridge: ps8622: reduce stack size for KASAN

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Date:   Thu,  2 Mar 2017 17:38:29 +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 21/26] drm/bridge: ps8622: reduce stack size for KASAN

When CONFIG_KASAN is set, each call to ps8622_set() adds an object to the
stack frame, leading to a warning about possible stack overflow:

drivers/gpu/drm/bridge/parade-ps8622.c: In function 'ps8622_send_config':
drivers/gpu/drm/bridge/parade-ps8622.c:338:1: error: the frame size of 5872 bytes is larger than 3072 bytes [-Werror=frame-larger-than=]

Marking this as noinline_for_kasan completely avoids the problem.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/gpu/drm/bridge/parade-ps8622.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/bridge/parade-ps8622.c b/drivers/gpu/drm/bridge/parade-ps8622.c
index ac8cc5b50d9f..6b995edd2a46 100644
--- a/drivers/gpu/drm/bridge/parade-ps8622.c
+++ b/drivers/gpu/drm/bridge/parade-ps8622.c
@@ -79,7 +79,7 @@ static inline struct ps8622_bridge *
 	return container_of(connector, struct ps8622_bridge, connector);
 }
 
-static int ps8622_set(struct i2c_client *client, u8 page, u8 reg, u8 val)
+static noinline_for_kasan int ps8622_set(struct i2c_client *client, u8 page, u8 reg, u8 val)
 {
 	int ret;
 	struct i2c_adapter *adap = client->adapter;
-- 
2.9.0