linux-kernel - [PATCH v4 07/15] objtool: Merge mark_func_jump_tables() and add_func_jump

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Date:   Tue, 11 Jul 2023 18:08:33 +0200
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Michael Ellerman <mpe@...erman.id.au>,
        Nicholas Piggin <npiggin@...il.com>,
        Josh Poimboeuf <jpoimboe@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Sathvika Vasireddy <sv@...ux.ibm.com>,
        Naveen N Rao <naveen@...nel.org>
Cc:     Christophe Leroy <christophe.leroy@...roup.eu>,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH v4 07/15] objtool: Merge mark_func_jump_tables() and add_func_jump_tables()

Those two functions loop over the instructions of a function.
Merge the two loops in order to ease enhancement of table end
in a following patch.

Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
---
 tools/objtool/check.c | 22 ++++++----------------
 1 file changed, 6 insertions(+), 16 deletions(-)

diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index 5a6a87ddbf27..d51f47c4a3bd 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -2097,11 +2097,12 @@ static struct reloc *find_jump_table(struct objtool_file *file,
  * First pass: Mark the head of each jump table so that in the next pass,
  * we know when a given jump table ends and the next one starts.
  */
-static void mark_func_jump_tables(struct objtool_file *file,
-				    struct symbol *func)
+static int mark_add_func_jump_tables(struct objtool_file *file,
+				     struct symbol *func)
 {
-	struct instruction *insn, *last = NULL;
+	struct instruction *insn, *last = NULL, *insn_t1 = NULL, *insn_t2;
 	struct reloc *reloc;
+	int ret = 0;
 
 	func_for_each_insn(file, func, insn) {
 		if (!last)
@@ -2127,17 +2128,7 @@ static void mark_func_jump_tables(struct objtool_file *file,
 		reloc = find_jump_table(file, func, insn);
 		if (reloc)
 			insn->_jump_table = reloc;
-	}
-}
-
-static int add_func_jump_tables(struct objtool_file *file,
-				  struct symbol *func)
-{
-	struct instruction *insn, *insn_t1 = NULL, *insn_t2;
-	int ret = 0;
-
-	func_for_each_insn(file, func, insn) {
-		if (!insn_jump_table(insn))
+		else
 			continue;
 
 		if (!insn_t1) {
@@ -2177,8 +2168,7 @@ static int add_jump_table_alts(struct objtool_file *file)
 		if (func->type != STT_FUNC)
 			continue;
 
-		mark_func_jump_tables(file, func);
-		ret = add_func_jump_tables(file, func);
+		ret = mark_add_func_jump_tables(file, func);
 		if (ret)
 			return ret;
 	}
-- 
2.41.0