Unverified Commit 36a49803 authored Nov 07, 2018 by Paul Burton

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

parent ea6a3737

arch/mips/include/asm/switch_to.h

+5 −1

Original line number	Diff line number	Diff line
		@@ -84,6 +84,7 @@ do { \
		* Check FCSR for any unmasked exceptions pending set with `ptrace',
		* clear them and send a signal.
		*/
		#ifdef CONFIG_MIPS_FP_SUPPORT
		# define __sanitize_fcr31(next) \
		do { \
		unsigned long fcr31 = mask_fcr31_x(next->thread.fpu.fcr31); \
		@@ -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