From: James Hogan <james.hogan@imgtec.com>
Date: Fri, 14 Mar 2014 13:06:10 +0000 (+0000)
Subject: MIPS: KVM: Remove dead code in CP0 emulation
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=36c95494609cd6d2541c08e806b4d6bc401bc53f;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

MIPS: KVM: Remove dead code in CP0 emulation

The code to check whether rd > MIPS_CP0_DESAVE is dead code, since
MIPS_CP0_DESAVE = 31 and rd is already masked with 0x1f. Remove it.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Gleb Natapov <gleb@kernel.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Sanjay Lal <sanjayl@kymasys.com>
Cc: linux-mips@linux-mips.org
Cc: kvm@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---

diff --git a/arch/mips/kvm/kvm_mips_emul.c b/arch/mips/kvm/kvm_mips_emul.c
index d562572c2efc..e3fec99941a7 100644
--- a/arch/mips/kvm/kvm_mips_emul.c
+++ b/arch/mips/kvm/kvm_mips_emul.c
@@ -436,13 +436,6 @@ kvm_mips_emulate_CP0(uint32_t inst, uint32_t *opc, uint32_t cause,
 	sel = inst & 0x7;
 	co_bit = (inst >> 25) & 1;
 
-	/* Verify that the register is valid */
-	if (rd > MIPS_CP0_DESAVE) {
-		printk("Invalid rd: %d\n", rd);
-		er = EMULATE_FAIL;
-		goto done;
-	}
-
 	if (co_bit) {
 		op = (inst) & 0xff;