linux-kernel - [PATCH] mips: asm: fix warning when disabling MIPS_FP

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: Windows password security audit tool. GUI, reports in PDF.

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

Message-Id: <20241012-mips-fcr31-warning-v1-1-bac1d869d775@gmail.com>
Date: Sat, 12 Oct 2024 12:12:14 +0200
From: Jonas Gorski <jonas.gorski@...il.com>
To: Thomas Bogendoerfer <tsbogend@...ha.franken.de>, 
 Paul Burton <paulburton@...nel.org>
Cc: linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] mips: asm: fix warning when disabling MIPS_FP_SUPPORT

When MIPS_FP_SUPPORT is disabled, __sanitize_fcr31() is defined as
nothing, which triggers a gcc warning:

    In file included from kernel/sched/core.c:79:
    kernel/sched/core.c: In function 'context_switch':
    ./arch/mips/include/asm/switch_to.h:114:39: warning: suggest braces around empty body in an 'if' statement [-Wempty-body]
      114 |                 __sanitize_fcr31(next);                                 \
          |                                       ^
    kernel/sched/core.c:5316:9: note: in expansion of macro 'switch_to'
     5316 |         switch_to(prev, next, prev);
          |         ^~~~~~~~~

Fix this by providing an empty body for __sanitize_fcr31() like one is
defined for __mips_mt_fpaff_switch_to().

Fixes: 36a498035bd2 ("MIPS: Avoid FCSR sanitization when CONFIG_MIPS_FP_SUPPORT=n")
Signed-off-by: Jonas Gorski <jonas.gorski@...il.com>
---
 arch/mips/include/asm/switch_to.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/mips/include/asm/switch_to.h b/arch/mips/include/asm/switch_to.h
index a4374b4cb88fd830f8b83caab52d6e3c133fd0c4..d6ccd53440213315ec75a54caf683c32c69dcdbe 100644
--- a/arch/mips/include/asm/switch_to.h
+++ b/arch/mips/include/asm/switch_to.h
@@ -97,7 +97,7 @@ do {									\
 	}								\
 } while (0)
 #else
-# define __sanitize_fcr31(next)
+# define __sanitize_fcr31(next) do { (void) (next); } while (0)
 #endif
 
 /*

---
base-commit: 9852d85ec9d492ebef56dc5f229416c925758edc
change-id: 20241012-mips-fcr31-warning-d4eebcfc91c5

Best regards,
-- 
Jonas Gorski <jonas.gorski@...il.com>