Get rid of the eir struct mips_fpu_emulator_private member. It's

never initialized been initialized anywhere, just saved to and
restored from signal frames so nonsense anyway.  As neat side effect
of being shared between all processors it was also abusable as a
nice covert channel between processes.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/math-emu/kernel_linkage.c

@@ -63,7 +63,6 @@ int fpu_emulator_save_context(struct sigcontext *sc)
 			       &sc->sc_fpregs[i]);
 	}
 	err |= __put_user(current->thread.fpu.soft.fcr31, &sc->sc_fpc_csr);
-	err |= __put_user(fpuemuprivate.eir, &sc->sc_fpc_eir);
 
 	return err;
 }
@@ -79,7 +78,6 @@ int fpu_emulator_restore_context(struct sigcontext *sc)
 			       &sc->sc_fpregs[i]);
 	}
 	err |= __get_user(current->thread.fpu.soft.fcr31, &sc->sc_fpc_csr);
-	err |= __get_user(fpuemuprivate.eir, &sc->sc_fpc_eir);
 
 	return err;
 }
@@ -100,7 +98,6 @@ int fpu_emulator_save_context32(struct sigcontext32 *sc)
 			       &sc->sc_fpregs[i]);
 	}
 	err |= __put_user(current->thread.fpu.soft.fcr31, &sc->sc_fpc_csr);
-	err |= __put_user(fpuemuprivate.eir, &sc->sc_fpc_eir);
 
 	return err;
 }
@@ -116,7 +113,6 @@ int fpu_emulator_restore_context32(struct sigcontext32 *sc)
 			       &sc->sc_fpregs[i]);
 	}
 	err |= __get_user(current->thread.fpu.soft.fcr31, &sc->sc_fpc_csr);
-	err |= __get_user(fpuemuprivate.eir, &sc->sc_fpc_eir);
 
 	return err;
 }

include/asm-mips/fpu_emulator.h

@@ -24,7 +24,6 @@
 #define _ASM_FPU_EMULATOR_H
 
 struct mips_fpu_emulator_private {
-	unsigned int eir;
 	struct {
 		unsigned int emulated;
 		unsigned int loads;