linux-kernel - [PATCH 3/3] objtool: Constify arch_decode

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Message-Id: <20200422103205.61900-4-mingo@kernel.org>
Date:   Wed, 22 Apr 2020 12:32:05 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     linux-kernel@...r.kernel.org
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        Borislav Petkov <bp@...en8.de>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH 3/3] objtool: Constify arch_decode_instruction()

Mostly straightforward constification, except that WARN_FUNC()
needs a writable pointer while we have read-only pointers,
so deflect this to WARN().

Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 tools/objtool/arch.h            | 2 +-
 tools/objtool/arch/x86/decode.c | 6 +++---
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/tools/objtool/arch.h b/tools/objtool/arch.h
index 561c3162d177..445b8fa73ccb 100644
--- a/tools/objtool/arch.h
+++ b/tools/objtool/arch.h
@@ -72,7 +72,7 @@ struct instruction;
 
 void arch_initial_func_cfi_state(struct cfi_init_state *state);
 
-int arch_decode_instruction(struct elf *elf, struct section *sec,
+int arch_decode_instruction(const struct elf *elf, const struct section *sec,
 			    unsigned long offset, unsigned int maxlen,
 			    unsigned int *len, enum insn_type *type,
 			    unsigned long *immediate,
diff --git a/tools/objtool/arch/x86/decode.c b/tools/objtool/arch/x86/decode.c
index f0d42ad7d5ff..c45a0b4e0760 100644
--- a/tools/objtool/arch/x86/decode.c
+++ b/tools/objtool/arch/x86/decode.c
@@ -27,7 +27,7 @@ static unsigned char op_to_cfi_reg[][2] = {
 	{CFI_DI, CFI_R15},
 };
 
-static int is_x86_64(struct elf *elf)
+static int is_x86_64(const struct elf *elf)
 {
 	switch (elf->ehdr.e_machine) {
 	case EM_X86_64:
@@ -77,7 +77,7 @@ unsigned long arch_jump_destination(struct instruction *insn)
 	return insn->offset + insn->len + insn->immediate;
 }
 
-int arch_decode_instruction(struct elf *elf, struct section *sec,
+int arch_decode_instruction(const struct elf *elf, const struct section *sec,
 			    unsigned long offset, unsigned int maxlen,
 			    unsigned int *len, enum insn_type *type,
 			    unsigned long *immediate,
@@ -98,7 +98,7 @@ int arch_decode_instruction(struct elf *elf, struct section *sec,
 	insn_get_length(&insn);
 
 	if (!insn_complete(&insn)) {
-		WARN_FUNC("can't decode instruction", sec, offset);
+		WARN("can't decode instruction at %s:0x%lx", sec->name, offset);
 		return -1;
 	}
 
-- 
2.20.1