From: Richard Weinberger <richard@nod.at>
Date: Sun, 25 Oct 2015 20:41:10 +0000 (+0100)
Subject: um: Remove dead code from x86_64 syscall stub
X-Git-Tag: v4.4-rc1~48^2~5
X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=ec2c6c01ff241f8fad95c79de3364c76a474b3fa;p=linux.git

um: Remove dead code from x86_64 syscall stub

syscall_stub is dead code as um is using only
batch_syscall_stub.

Signed-off-by: Richard Weinberger <richard@nod.at>
---

diff --git a/arch/x86/um/stub_64.S b/arch/x86/um/stub_64.S
index 7160b20172d0..a212445358d6 100644
--- a/arch/x86/um/stub_64.S
+++ b/arch/x86/um/stub_64.S
@@ -1,19 +1,6 @@
 #include <as-layout.h>
 
-	.globl syscall_stub
 .section .__syscall_stub, "ax"
-syscall_stub:
-	syscall
-	/* We don't have 64-bit constants, so this constructs the address
-	 * we need.
-	 */
-	movq	$(STUB_DATA >> 32), %rbx
-	salq	$32, %rbx
-	movq	$(STUB_DATA & 0xffffffff), %rcx
-	or	%rcx, %rbx
-	movq	%rax, (%rbx)
-	int3
-
 	.globl batch_syscall_stub
 batch_syscall_stub:
 	mov	$(STUB_DATA >> 32), %rbx