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mtdchar: mark bits of ioctl handler noinline 

commit 0ea923f443 upstream.

The addition of the mtdchar_read_ioctl() function caused the stack usage
of mtdchar_ioctl() to grow beyond the warning limit on 32-bit architectures
with gcc-13:

drivers/mtd/mtdchar.c: In function 'mtdchar_ioctl':
drivers/mtd/mtdchar.c:1229:1: error: the frame size of 1488 bytes is larger than 1024 bytes [-Werror=frame-larger-than=]

Mark both the read and write portions as noinline_for_stack to ensure
they don't get inlined and use separate stack slots to reduce the
maximum usage, both in the mtdchar_ioctl() and combined with any
of its callees.

Fixes: 095bb6e44e ("mtdchar: add MEMREAD ioctl")
Cc: stable@vger.kernel.org
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20230417205654.1982368-1-arnd@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Arnd Bergmann 2023-04-17 22:56:50 +02:00 committed by Greg Kroah-Hartman
parent d7c34c8f60
commit 007c042256
1 changed files with 4 additions and 4 deletions
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8
drivers/mtd/mtdchar.c
View File

@ -590,8 +590,8 @@ static void adjust_oob_length(struct mtd_info *mtd, uint64_t start,
(end_page - start_page + 1) * oob_per_page);
}
static int mtdchar_write_ioctl(struct mtd_info *mtd,
struct mtd_write_req __user *argp)
static noinline_for_stack int
mtdchar_write_ioctl(struct mtd_info *mtd, struct mtd_write_req __user *argp)
{
struct mtd_info *master = mtd_get_master(mtd);
struct mtd_write_req req;
@ -688,8 +688,8 @@ static int mtdchar_write_ioctl(struct mtd_info *mtd,
return ret;
}
static int mtdchar_read_ioctl(struct mtd_info *mtd,
struct mtd_read_req __user *argp)
static noinline_for_stack int
mtdchar_read_ioctl(struct mtd_info *mtd, struct mtd_read_req __user *argp)
{
struct mtd_info *master = mtd_get_master(mtd);
struct mtd_read_req req;