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MIPS: Avoid FCSR sanitization when CONFIG_MIPS_FP_SUPPORT=n

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When CONFIG_MIPS_FP_SUPPORT=n we don't support floating point, so we
don't need to worry about floating point exceptions pending in the
Floating point Control & Status Register (FCSR) during switch_to(). Stub
out the __sanitize_fcr31() macro in this case.

Signed-off-by: Paul Burton <paul.burton@mips.com>
Patchwork: https://patchwork.linux-mips.org/patch/21010/
Cc: linux-mips@linux-mips.org
This commit is contained in:
Paul Burton 2018-11-07 23:14:09 +00:00
parent ea6a37373f
commit 36a498035b
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1 changed files with 5 additions and 1 deletions
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6
arch/mips/include/asm/switch_to.h
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@ -84,7 +84,8 @@ do { \
* Check FCSR for any unmasked exceptions pending set with `ptrace',
* clear them and send a signal.
*/
#define __sanitize_fcr31(next) \
#ifdef CONFIG_MIPS_FP_SUPPORT
# define __sanitize_fcr31(next) \
do { \
unsigned long fcr31 = mask_fcr31_x(next->thread.fpu.fcr31); \
void __user *pc; \
@ -95,6 +96,9 @@ do { \
force_fcr31_sig(fcr31, pc, next); \
} \
} while (0)
#else
# define __sanitize_fcr31(next)
#endif
/*
* For newly created kernel threads switch_to() will return to