[PATCH v2 1/2] powerpc64/bpf: Fix build break in bpf_jit_emit_func_call_rel()

[Saket Kumar Bhaskar <skb99@linux.ibm.com>]

From: Madhavan Srinivasan <maddy@linux.ibm.com>

With CONFIG_PPC_KERNEL_PCREL enabled, build breaks with below error:

  CC      mm/dmapool.o
  CC      fs/readdir.o
arch/powerpc/net/bpf_jit_comp64.c: In function 'bpf_jit_emit_func_call_rel':
arch/powerpc/net/bpf_jit_comp64.c:475:13: error: unused variable 'ret' [-Werror=unused-variable]
  475 |         int ret;
      |             ^~~

Commit b55b6b9ad76c ("powerpc64/bpf: Add powerpc64 JIT support for timed may_goto")
introduced "ret" at function scope, but it is only used within its
respective conditional blocks. Same holds true for reladdr. Move both
variable declarations to the scopes where they are actually used:
"reladdr" to the CONFIG_PPC_KERNEL_PCREL block and "ret" to the non-PCREL
else block.

Fixes: b55b6b9ad76c ("powerpc64/bpf: Add powerpc64 JIT support for timed may_goto")
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Signed-off-by: Saket Kumar Bhaskar <skb99@linux.ibm.com>
---
 arch/powerpc/net/bpf_jit_comp64.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/powerpc/net/bpf_jit_comp64.c b/arch/powerpc/net/bpf_jit_comp64.c
index dab106cae22b..fc9db691e820 100644
--- a/arch/powerpc/net/bpf_jit_comp64.c
+++ b/arch/powerpc/net/bpf_jit_comp64.c
@@ -471,8 +471,6 @@ static int bpf_jit_emit_func_call(u32 *image, struct codegen_context *ctx, u64 f
 int bpf_jit_emit_func_call_rel(u32 *image, u32 *fimage, struct codegen_context *ctx, u64 func)
 {
 	unsigned long func_addr = func ? ppc_function_entry((void *)func) : 0;
-	long __maybe_unused reladdr;
-	int ret;
 
 	/* bpf to bpf call, func is not known in the initial pass. Emit 5 nops as a placeholder */
 	if (!func) {
@@ -487,6 +485,8 @@ int bpf_jit_emit_func_call_rel(u32 *image, u32 *fimage, struct codegen_context *
 	}
 
 #ifdef CONFIG_PPC_KERNEL_PCREL
+	long reladdr;
+
 	reladdr = func_addr - local_paca->kernelbase;
 
 	/*
@@ -525,7 +525,7 @@ int bpf_jit_emit_func_call_rel(u32 *image, u32 *fimage, struct codegen_context *
 	EMIT(PPC_RAW_BCTRL());
 #else
 	if (core_kernel_text(func_addr)) {
-		ret = bpf_jit_emit_func_call(image, ctx, func_addr, _R12);
+		int ret = bpf_jit_emit_func_call(image, ctx, func_addr, _R12);
 		if (ret)
 			return ret;
 	} else {
-- 
2.54.0