From: Arnd Bergmann <arnd@kernel.org>
To: "Miquel Raynal" <miquel.raynal@bootlin.com>,
"Richard Weinberger" <richard@nod.at>,
"Vignesh Raghavendra" <vigneshr@ti.com>,
"Michał Kępień" <kernel@kempniu.pl>
Cc: Arnd Bergmann <arnd@arndb.de>,
linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: [PATCH] mtdchar: mark bits of ioctl handler noinline
Date: Mon, 17 Apr 2023 22:56:50 +0200 [thread overview]
Message-ID: <20230417205654.1982368-1-arnd@kernel.org> (raw)
From: Arnd Bergmann <arnd@arndb.de>
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: 095bb6e44eb1 ("mtdchar: add MEMREAD ioctl")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
drivers/mtd/mtdchar.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/drivers/mtd/mtdchar.c b/drivers/mtd/mtdchar.c
index 01f1c6792df9..8dc4f5c493fc 100644
--- a/drivers/mtd/mtdchar.c
+++ b/drivers/mtd/mtdchar.c
@@ -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;
--
2.39.2
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next reply other threads:[~2023-04-17 20:57 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-04-17 20:56 Arnd Bergmann [this message]
2023-04-17 21:20 ` [PATCH] mtdchar: mark bits of ioctl handler noinline Richard Weinberger
2023-05-22 15:46 ` Miquel Raynal
2023-05-23 12:14 ` Arnd Bergmann
2023-05-23 13:43 ` Miquel Raynal
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