[PATCH 3/7] uprobes/x86: Conditionalize the usage of handle_riprel_insn()

[Oleg Nesterov <oleg@redhat.com>]

arch_uprobe_analyze_insn() calls handle_riprel_insn() at the start,
but only "0xff" and "default" cases need the UPROBE_FIX_RIP_ logic.
Move the callsite into "default" case and change the "0xff" case to
fall-through.

We are going to add the various hooks to handle the rip-relative
jmp/call instructions (and more), we need this change to enforce the
fact that the new code can't conflict with is_riprel_insn() code.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
---
 arch/x86/kernel/uprobes.c |    6 ++----
 1 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kernel/uprobes.c b/arch/x86/kernel/uprobes.c
index 098e56e..d72dfbf 100644
--- a/arch/x86/kernel/uprobes.c
+++ b/arch/x86/kernel/uprobes.c
@@ -376,8 +376,6 @@ int arch_uprobe_analyze_insn(struct arch_uprobe *auprobe, struct mm_struct *mm,
 	 * and annotate arch_uprobe->fixups accordingly. To start with, ->fixups
 	 * is either zero or it reflects rip-related fixups.
 	 */
-	handle_riprel_insn(auprobe, mm, &insn);
-
 	switch (OPCODE1(&insn)) {
 	case 0x9d:		/* popf */
 		auprobe->fixups |= UPROBE_FIX_SETF;
@@ -406,9 +404,9 @@ int arch_uprobe_analyze_insn(struct arch_uprobe *auprobe, struct mm_struct *mm,
 		case 4: case 5:			/* jmp or ljmp, indirect */
 			fix_ip = false;
 		}
-		break;
+		/* fall through */
 	default:
-		break;
+		handle_riprel_insn(auprobe, mm, &insn);
 	}
 
 	if (fix_ip)
-- 
1.5.5.1