linux-kernel - [PATCH] tty: n_hdlc: fix build on SPARC

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Date:   Mon, 30 Sep 2019 19:15:12 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     LKML <linux-kernel@...r.kernel.org>, sparclinux@...r.kernel.org
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kees Cook <keescook@...omium.org>,
        David Miller <davem@...emloft.net>,
        kbuild test robot <lkp@...el.com>
Subject: [PATCH] tty: n_hdlc: fix build on SPARC

From: Randy Dunlap <rdunlap@...radead.org>

Fix tty driver build on SPARC by not using __exitdata.
It appears that SPARC does not support section .exit.data.

Fixes these build errors:

`.exit.data' referenced in section `.exit.text' of drivers/tty/n_hdlc.o: defined in discarded section `.exit.data' of drivers/tty/n_hdlc.o
`.exit.data' referenced in section `.exit.text' of drivers/tty/n_hdlc.o: defined in discarded section `.exit.data' of drivers/tty/n_hdlc.o
`.exit.data' referenced in section `.exit.text' of drivers/tty/n_hdlc.o: defined in discarded section `.exit.data' of drivers/tty/n_hdlc.o
`.exit.data' referenced in section `.exit.text' of drivers/tty/n_hdlc.o: defined in discarded section `.exit.data' of drivers/tty/n_hdlc.o

Reported-by: kbuild test robot <lkp@...el.com>
Fixes: 063246641d4a ("format-security: move static strings to const")
Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
Cc: Kees Cook <keescook@...omium.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: "David S. Miller" <davem@...emloft.net>
Cc: Andrew Morton <akpm@...ux-foundation.org>
---
 drivers/tty/n_hdlc.c |    5 +++++
 1 file changed, 5 insertions(+)

--- mmotm-2019-0925-1810.orig/drivers/tty/n_hdlc.c
+++ mmotm-2019-0925-1810/drivers/tty/n_hdlc.c
@@ -968,6 +968,11 @@ static int __init n_hdlc_init(void)
 	
 }	/* end of init_module() */
 
+#ifdef CONFIG_SPARC
+#undef __exitdata
+#define __exitdata
+#endif
+
 static const char hdlc_unregister_ok[] __exitdata =
 	KERN_INFO "N_HDLC: line discipline unregistered\n";
 static const char hdlc_unregister_fail[] __exitdata =