linux-kernel - [PATCH 23/26] mtd: cfi: reduce stack size with KASAN

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Date:   Thu,  2 Mar 2017 17:38:31 +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 23/26] mtd: cfi: reduce stack size with KASAN

When CONFIG_KASAN is used, we consume a lot of extra stack space:

drivers/mtd/chips/cfi_cmdset_0020.c: In function 'do_write_buffer':
drivers/mtd/chips/cfi_cmdset_0020.c:603:1: error: the frame size of 2080 bytes is larger than 1536 bytes [-Werror=frame-larger-than=]
drivers/mtd/chips/cfi_cmdset_0020.c: In function 'cfi_staa_erase_varsize':
drivers/mtd/chips/cfi_cmdset_0020.c:972:1: error: the frame size of 1936 bytes is larger than 1536 bytes [-Werror=frame-larger-than=]
drivers/mtd/chips/cfi_cmdset_0001.c: In function 'do_write_buffer':
drivers/mtd/chips/cfi_cmdset_0001.c:1841:1: error: the frame size of 1776 bytes is larger than 1536 bytes [-Werror=frame-larger-than=]

This marks some functions as noinline_for_kasan to keep reduce the
overall stack size.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/mtd/chips/cfi_cmdset_0020.c | 8 ++++----
 include/linux/mtd/map.h             | 8 ++++----
 2 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/mtd/chips/cfi_cmdset_0020.c b/drivers/mtd/chips/cfi_cmdset_0020.c
index 94d3eb42c4d5..8a21e030829c 100644
--- a/drivers/mtd/chips/cfi_cmdset_0020.c
+++ b/drivers/mtd/chips/cfi_cmdset_0020.c
@@ -244,7 +244,7 @@ static struct mtd_info *cfi_staa_setup(struct map_info *map)
 }
 
 
-static inline int do_read_onechip(struct map_info *map, struct flchip *chip, loff_t adr, size_t len, u_char *buf)
+static noinline_for_kasan int do_read_onechip(struct map_info *map, struct flchip *chip, loff_t adr, size_t len, u_char *buf)
 {
 	map_word status, status_OK;
 	unsigned long timeo;
@@ -728,7 +728,7 @@ cfi_staa_writev(struct mtd_info *mtd, const struct kvec *vecs,
 }
 
 
-static inline int do_erase_oneblock(struct map_info *map, struct flchip *chip, unsigned long adr)
+static noinline_for_kasan int do_erase_oneblock(struct map_info *map, struct flchip *chip, unsigned long adr)
 {
 	struct cfi_private *cfi = map->fldrv_priv;
 	map_word status, status_OK;
@@ -1029,7 +1029,7 @@ static void cfi_staa_sync (struct mtd_info *mtd)
 	}
 }
 
-static inline int do_lock_oneblock(struct map_info *map, struct flchip *chip, unsigned long adr)
+static noinline_for_kasan int do_lock_oneblock(struct map_info *map, struct flchip *chip, unsigned long adr)
 {
 	struct cfi_private *cfi = map->fldrv_priv;
 	map_word status, status_OK;
@@ -1175,7 +1175,7 @@ static int cfi_staa_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
 	}
 	return 0;
 }
-static inline int do_unlock_oneblock(struct map_info *map, struct flchip *chip, unsigned long adr)
+static noinline_for_kasan int do_unlock_oneblock(struct map_info *map, struct flchip *chip, unsigned long adr)
 {
 	struct cfi_private *cfi = map->fldrv_priv;
 	map_word status, status_OK;
diff --git a/include/linux/mtd/map.h b/include/linux/mtd/map.h
index 3aa56e3104bb..8c2e241f45c7 100644
--- a/include/linux/mtd/map.h
+++ b/include/linux/mtd/map.h
@@ -316,7 +316,7 @@ static inline map_word map_word_or(struct map_info *map, map_word val1, map_word
 	return r;
 }
 
-static inline int map_word_andequal(struct map_info *map, map_word val1, map_word val2, map_word val3)
+static noinline_for_kasan int map_word_andequal(struct map_info *map, map_word val1, map_word val2, map_word val3)
 {
 	int i;
 
@@ -328,7 +328,7 @@ static inline int map_word_andequal(struct map_info *map, map_word val1, map_wor
 	return 1;
 }
 
-static inline int map_word_bitsset(struct map_info *map, map_word val1, map_word val2)
+static noinline_for_kasan int map_word_bitsset(struct map_info *map, map_word val1, map_word val2)
 {
 	int i;
 
@@ -362,7 +362,7 @@ static inline map_word map_word_load(struct map_info *map, const void *ptr)
 	return r;
 }
 
-static inline map_word map_word_load_partial(struct map_info *map, map_word orig, const unsigned char *buf, int start, int len)
+static noinline_for_kasan map_word map_word_load_partial(struct map_info *map, map_word orig, const unsigned char *buf, int start, int len)
 {
 	int i;
 
@@ -392,7 +392,7 @@ static inline map_word map_word_load_partial(struct map_info *map, map_word orig
 #define MAP_FF_LIMIT 8
 #endif
 
-static inline map_word map_word_ff(struct map_info *map)
+static noinline_for_kasan map_word map_word_ff(struct map_info *map)
 {
 	map_word r;
 	int i;
-- 
2.9.0