linux-kernel - [PATCH] s390/jump_label: Correct asm contraint

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20190123125513.20210-1-labbott@redhat.com>
Date:   Wed, 23 Jan 2019 13:55:13 +0100
From:   Laura Abbott <labbott@...hat.com>
To:     Martin Schwidefsky <schwidefsky@...ibm.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>
Cc:     Laura Abbott <labbott@...hat.com>, linux-s390@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] s390/jump_label: Correct asm contraint

There's a build failure with gcc9:

 ./arch/s390/include/asm/jump_label.h: Assembler messages:
 ./arch/s390/include/asm/jump_label.h:23: Error: bad expression
 ./arch/s390/include/asm/jump_label.h:23: Error: junk at end of line, first unrecognized character is `r'
 make[1]: *** [scripts/Makefile.build:277: init/main.o] Error 1

According to the toolchain people, the actual issue is the use of
"X" constraint which is too permissive. Switch to using "i" instead.

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1668703
Signed-off-by: Laura Abbott <labbott@...hat.com>
---
 arch/s390/include/asm/jump_label.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/s390/include/asm/jump_label.h b/arch/s390/include/asm/jump_label.h
index e2d3e6c43395..41dabfd8518d 100644
--- a/arch/s390/include/asm/jump_label.h
+++ b/arch/s390/include/asm/jump_label.h
@@ -22,7 +22,7 @@ static inline bool arch_static_branch(struct static_key *key, bool branch)
 			  ".long	0b-.,%l[label]-.\n"
 			  ".quad	%0-.\n"
 			  ".popsection\n"
-			  : : "X" (&((char *)key)[branch]) : : label);
+			  : : "i" (&((char *)key)[branch]) : : label);
 	return false;
 label:
 	return true;
@@ -36,7 +36,7 @@ static inline bool arch_static_branch_jump(struct static_key *key, bool branch)
 			  ".long	0b-.,%l[label]-.\n"
 			  ".quad	%0-.\n"
 			  ".popsection\n"
-			  : : "X" (&((char *)key)[branch]) : : label);
+			  : : "i" (&((char *)key)[branch]) : : label);
 	return false;
 label:
 	return true;
-- 
2.20.1