linux-kernel - [PATCH v2 07/11] r820t: mark register functions as noinline_if

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Message-Id: <20170614211556.2062728-8-arnd@arndb.de>
Date:   Wed, 14 Jun 2017 23:15:42 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     kasan-dev@...glegroups.com, Dmitry Vyukov <dvyukov@...gle.com>,
        Alexander Potapenko <glider@...gle.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Arend van Spriel <arend.vanspriel@...adcom.com>,
        Arnd Bergmann <arnd@...db.de>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Max Kellermann <max.kellermann@...il.com>,
        linux-media@...r.kernel.org
Subject: [PATCH v2 07/11] r820t: mark register functions as noinline_if_stackbloat

With KASAN, we get an overly long stack frame due to inlining
the register access function:

drivers/media/tuners/r820t.c: In function 'generic_set_freq.isra.7':
drivers/media/tuners/r820t.c:1334:1: error: the frame size of 2880 bytes is larger than 2048 bytes [-Werror=frame-larger-than=]

An earlier patch I tried used an open-coded r820t_write_reg()
implementation that may have been more efficent, while this
version simply adds the annotation, which has a lower risk for
regressions.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/media/tuners/r820t.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/media/tuners/r820t.c b/drivers/media/tuners/r820t.c
index ba80376a3b86..a26d0eb64555 100644
--- a/drivers/media/tuners/r820t.c
+++ b/drivers/media/tuners/r820t.c
@@ -396,7 +396,7 @@ static int r820t_write(struct r820t_priv *priv, u8 reg, const u8 *val,
 	return 0;
 }
 
-static int r820t_write_reg(struct r820t_priv *priv, u8 reg, u8 val)
+static noinline_if_stackbloat int r820t_write_reg(struct r820t_priv *priv, u8 reg, u8 val)
 {
 	return r820t_write(priv, reg, &val, 1);
 }
@@ -411,7 +411,7 @@ static int r820t_read_cache_reg(struct r820t_priv *priv, int reg)
 		return -EINVAL;
 }
 
-static int r820t_write_reg_mask(struct r820t_priv *priv, u8 reg, u8 val,
+static noinline_if_stackbloat int r820t_write_reg_mask(struct r820t_priv *priv, u8 reg, u8 val,
 				u8 bit_mask)
 {
 	int rc = r820t_read_cache_reg(priv, reg);
-- 
2.9.0