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@gmail.com>
Reviewed-by: Maciej W. Rozycki <macro@orcam.me.uk>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

diff --git a/arch/mips/include/asm/switch_to.h b/arch/mips/include/asm/switch_to.h
index a4374b4cb88fd830f8b83caab52d6e3c133fd0c4..d6ccd53440213315ec75a54caf683c32c69dcdbe 100644 (file)
--- 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
 
 /*