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| author | Paul Burton <paul.burton@mips.com> | 2018-11-07 23:14:09 +0000 |
|---|---|---|
| committer | Paul Burton <paul.burton@mips.com> | 2018-11-09 10:23:18 -0800 |
| commit | 36a498035bd2e5169bbceed1e3b0c8bb0ce5a7b4 (patch) | |
| tree | a56b00865d9ec4048c50dcc0aefbbc26d1bc155e | |
| parent | ea6a37373f9aca4ecb98ea3a298fda57177ee6a5 (diff) | |
| download | linux-36a498035bd2e5169bbceed1e3b0c8bb0ce5a7b4.tar.bz2 | |
MIPS: Avoid FCSR sanitization when CONFIG_MIPS_FP_SUPPORT=n
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
| -rw-r--r-- | arch/mips/include/asm/switch_to.h | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/arch/mips/include/asm/switch_to.h b/arch/mips/include/asm/switch_to.h index e610473d61b8..0f813bb753c6 100644 --- a/arch/mips/include/asm/switch_to.h +++ b/arch/mips/include/asm/switch_to.h @@ -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 |