linux-kernel - [PATCH 3/3] media: go7007: avoid clang frame overflow warning with KASAN

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Date:   Tue, 19 Feb 2019 18:01:58 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Hans Verkuil <hans.verkuil@...co.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>
Cc:     Nick Desaulniers <ndesaulniers@...gle.com>,
        Mark Brown <broonie@...nel.org>,
        Nathan Chancellor <natechancellor@...il.com>,
        Arnd Bergmann <arnd@...db.de>,
        Kees Cook <keescook@...omium.org>, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 3/3] media: go7007: avoid clang frame overflow warning with KASAN

clang-8 warns about one function here when KASAN is enabled, even
without the 'asan-stack' option:

drivers/media/usb/go7007/go7007-fw.c:1551:5: warning: stack frame size of 2656 bytes in function

I have reported this issue in the llvm bugzilla, but to make
it work with the clang-8 release, a small annotation is still
needed.

Link: https://bugs.llvm.org/show_bug.cgi?id=38809
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/media/usb/go7007/go7007-fw.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/usb/go7007/go7007-fw.c b/drivers/media/usb/go7007/go7007-fw.c
index 24f5b615dc7a..c7201e93c331 100644
--- a/drivers/media/usb/go7007/go7007-fw.c
+++ b/drivers/media/usb/go7007/go7007-fw.c
@@ -1499,7 +1499,7 @@ static int modet_to_package(struct go7007 *go, __le16 *code, int space)
 	return cnt;
 }
 
-static int do_special(struct go7007 *go, u16 type, __le16 *code, int space,
+static noinline_for_stack int do_special(struct go7007 *go, u16 type, __le16 *code, int space,
 			int *framelen)
 {
 	switch (type) {
-- 
2.20.0