From 0b582db5490a1f250ef63337dd46d5c7599dae80 Mon Sep 17 00:00:00 2001
From: Jordan Niethe <jniethe5@gmail.com>
Date: Wed, 6 May 2020 13:40:40 +1000
Subject: [PATCH] powerpc: Make test_translate_branch() independent of
instruction length
test_translate_branch() uses two pointers to instructions within a
buffer, p and q, to test patch_branch(). The pointer arithmetic done on
them assumes a size of 4. This will not work if the instruction length
changes. Instead do the arithmetic relative to the void * to the buffer.
Signed-off-by: Jordan Niethe <jniethe5@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Reviewed-by: Alistair Popple <alistair@popple.id.au>
Link: https://lore.kernel.org/r/20200506034050.24806-21-jniethe5@gmail.com
---
arch/powerpc/lib/code-patching.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/arch/powerpc/lib/code-patching.c b/arch/powerpc/lib/code-patching.c
index 435fc8e9f45d4..d946f7d6bb32d 100644
--- a/arch/powerpc/lib/code-patching.c
+++ b/arch/powerpc/lib/code-patching.c
@@ -572,7 +572,7 @@ static void __init test_branch_bform(void)
static void __init test_translate_branch(void)
{
unsigned long addr;
- struct ppc_inst *p, *q;
+ void *p, *q;
struct ppc_inst instr;
void *buf;
@@ -586,7 +586,7 @@ static void __init test_translate_branch(void)
addr = (unsigned long)p;
patch_branch(p, addr, 0);
check(instr_is_branch_to_addr(p, addr));
- q = p + 1;
+ q = p + 4;
translate_branch(&instr, q, p);
patch_instruction(q, instr);
check(instr_is_branch_to_addr(q, addr));
@@ -642,7 +642,7 @@ static void __init test_translate_branch(void)
create_cond_branch(&instr, p, addr, 0);
patch_instruction(p, instr);
check(instr_is_branch_to_addr(p, addr));
- q = p + 1;
+ q = buf + 4;
translate_branch(&instr, q, p);
patch_instruction(q, instr);
check(instr_is_branch_to_addr(q, addr));
--
2.30.2