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Commit 2707cd29 authored by David Daney's avatar David Daney Committed by Ralf Baechle
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MIPS: Add FPU emulator counter for emulated delay slots. 



Delay slot emulation in the FPU emulator is the only kernel user of an
executable stack, it is also very slow.  Add a counter so we can see
how many of these emulations are done.

Signed-off-by: default avatarDavid Daney <david.daney@cavium.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/8634/


Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent 7d168923

arch/mips/include/asm/fpu_emulator.h

+1 −0
Original line number Diff line number Diff line
@@ -44,6 +44,7 @@ struct mips_fpu_emulator_stats { 
	unsigned long ieee754_overflow;

	unsigned long ieee754_zerodiv;

	unsigned long ieee754_invalidop;

	unsigned long ds_emul;

};



DECLARE_PER_CPU(struct mips_fpu_emulator_stats, fpuemustats);

arch/mips/math-emu/dsemul.c

+1 −1
Original line number Diff line number Diff line
@@ -158,6 +158,6 @@ int do_dsemulret(struct pt_regs *xcp) 


	/* Set EPC to return to post-branch instruction */

	xcp->cp0_epc = epc;



	MIPS_FPU_EMU_INC_STATS(ds_emul);

	return 1;

}

arch/mips/math-emu/me-debugfs.c

+1 −0
Original line number Diff line number Diff line
@@ -61,6 +61,7 @@ do { \ 
	FPU_STAT_CREATE(ieee754_overflow);

	FPU_STAT_CREATE(ieee754_zerodiv);

	FPU_STAT_CREATE(ieee754_invalidop);

	FPU_STAT_CREATE(ds_emul);



	return 0;

}