From: Richard Weinberger <richard@nod.at>
Date: Sun, 20 Jul 2014 11:39:27 +0000 (+0200)
Subject: um: segv: Save regs only in case of a kernel mode fault
X-Git-Tag: v5.15~17588^2
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=bb6a1b2e189f797c0e4a116aec7ce77c344f11e0;p=platform%2Fkernel%2Flinux-starfive.git

um: segv: Save regs only in case of a kernel mode fault

...otherwise me lose user mode regs and the resulting
stack trace is useless.

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

diff --git a/arch/um/kernel/trap.c b/arch/um/kernel/trap.c
index 974b874..5678c35 100644
--- a/arch/um/kernel/trap.c
+++ b/arch/um/kernel/trap.c
@@ -206,7 +206,7 @@ unsigned long segv(struct faultinfo fi, unsigned long ip, int is_user,
 	int is_write = FAULT_WRITE(fi);
 	unsigned long address = FAULT_ADDRESS(fi);
 
-	if (regs)
+	if (!is_user && regs)
 		current->thread.segv_regs = container_of(regs, struct pt_regs, regs);
 
 	if (!is_user && (address >= start_vm) && (address < end_vm)) {