linux-hardening - [PATCH] tty: Move TIOCSTI toggle variable before kerndoc

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Date:   Sun,  6 Nov 2022 19:46:35 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Kees Cook <keescook@...omium.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Jiri Slaby <jirislaby@...nel.org>,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: [PATCH] tty: Move TIOCSTI toggle variable before kerndoc

The variable "tty_legacy_tiocsti" should be defined before the kerndoc
for the tiocsti() function. The new variable was breaking the "htmldocs"
build target:

drivers/tty/tty_io.c:2271: warning: cannot understand function prototype: 'bool tty_legacy_tiocsti __read_mostly = IS_ENABLED(CONFIG_LEGACY_TIOCSTI); '

Reported-by: Stephen Rothwell <sfr@...b.auug.org.au>
Link: https://lore.kernel.org/lkml/20221107143434.66f7be35@canb.auug.org.au
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Jiri Slaby <jirislaby@...nel.org>
Signed-off-by: Kees Cook <keescook@...omium.org>
---
 drivers/tty/tty_io.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index a6a16cf986b7..24ebcb495145 100644
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -2255,6 +2255,7 @@ static int tty_fasync(int fd, struct file *filp, int on)
 	return retval;
 }
 
+static bool tty_legacy_tiocsti __read_mostly = IS_ENABLED(CONFIG_LEGACY_TIOCSTI);
 /**
  * tiocsti		-	fake input character
  * @tty: tty to fake input into
@@ -2268,7 +2269,6 @@ static int tty_fasync(int fd, struct file *filp, int on)
  *  * Called functions take tty_ldiscs_lock
  *  * current->signal->tty check is safe without locks
  */
-static bool tty_legacy_tiocsti __read_mostly = IS_ENABLED(CONFIG_LEGACY_TIOCSTI);
 static int tiocsti(struct tty_struct *tty, char __user *p)
 {
 	char ch, mbz = 0;
-- 
2.34.1