From: Andi Kleen <ak@suse.de>
Date: Tue, 30 May 2006 20:48:03 +0000 (+0200)
Subject: [PATCH] x86_64: Don't do syscall exit tracing twice
X-Git-Tag: firefly_0821_release~35615
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=822ff019f72ae01baef1893e86735f1a5e36be7d;p=firefly-linux-kernel-4.4.55.git

[PATCH] x86_64: Don't do syscall exit tracing twice

int_ret_from_syscall already does syscall exit tracing, so
no need to do it again in the caller.

This caused problems for UML and some other special programs doing
syscall interception.

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/arch/x86_64/kernel/entry.S b/arch/x86_64/kernel/entry.S
index c946e4fe67a7..586b34c00c48 100644
--- a/arch/x86_64/kernel/entry.S
+++ b/arch/x86_64/kernel/entry.S
@@ -281,12 +281,7 @@ tracesys:
 	ja  1f
 	movq %r10,%rcx	/* fixup for C */
 	call *sys_call_table(,%rax,8)
-	movq %rax,RAX-ARGOFFSET(%rsp)
-1:	SAVE_REST
-	movq %rsp,%rdi
-	call syscall_trace_leave
-	RESTORE_TOP_OF_STACK %rbx
-	RESTORE_REST
+1:	movq %rax,RAX-ARGOFFSET(%rsp)
 	/* Use IRET because user could have changed frame */
 	jmp int_ret_from_sys_call
 	CFI_ENDPROC