linux-kernel - [PATCH v4 3/3] powerpc/modules: Improve restore

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Date:   Tue, 14 Nov 2017 04:29:10 -0500
From:   Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>
To:     Michael Ellerman <mpe@...erman.id.au>
Cc:     Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        live-patching@...r.kernel.org,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Balbir Singh <bsingharora@...il.com>
Subject: [PATCH v4 3/3] powerpc/modules: Improve restore_r2() error message

From: Josh Poimboeuf <jpoimboe@...hat.com>

Print the function address associated with the restore_r2() error to
make it easier to debug the problem.

Also clarify the wording a bit.

Before:

  module_64: patch_foo: Expect noop after relocate, got 3c820000

After:

  module_64: patch_foo: Expected noop after call, got 7c630034 at netdev_has_upper_dev+0x54/0xb0 [patch_foo]

Signed-off-by: Josh Poimboeuf <jpoimboe@...hat.com>
Signed-off-by: Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>
---
 arch/powerpc/kernel/module_64.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/kernel/module_64.c b/arch/powerpc/kernel/module_64.c
index 9e5391f..dad3ea5 100644
--- a/arch/powerpc/kernel/module_64.c
+++ b/arch/powerpc/kernel/module_64.c
@@ -494,8 +494,8 @@ static int restore_r2(u32 *instruction, struct module *me)
 		return 1;
 
 	if (*instruction != PPC_INST_NOP) {
-		pr_err("%s: Expect noop after relocate, got %08x\n",
-		       me->name, *instruction);
+		pr_err("%s: Expected noop after call, got %08x at %pS\n",
+			me->name, *instruction, instruction);
 		return 0;
 	}
 	/* ld r2,R2_STACK_OFFSET(r1) */
-- 
2.9.3