linux-kernel - [tip: objtool/core] objtool: Shrink struct instruction

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Date:   Fri, 29 Oct 2021 08:03:04 -0000
From:   "tip-bot2 for Peter Zijlstra" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Borislav Petkov <bp@...e.de>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Alexei Starovoitov <ast@...nel.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: objtool/core] objtool: Shrink struct instruction

The following commit has been merged into the objtool/core branch of tip:

Commit-ID:     c509331b41b7365e17396c246e8c5797bccc8074
Gitweb:        https://git.kernel.org/tip/c509331b41b7365e17396c246e8c5797bccc8074
Author:        Peter Zijlstra <peterz@...radead.org>
AuthorDate:    Tue, 26 Oct 2021 14:01:35 +02:00
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Thu, 28 Oct 2021 23:25:25 +02:00

objtool: Shrink struct instruction

Any one instruction can only ever call a single function, therefore
insn->mcount_loc_node is superfluous and can use insn->call_node.

This shrinks struct instruction, which is by far the most numerous
structure objtool creates.

Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Reviewed-by: Borislav Petkov <bp@...e.de>
Acked-by: Josh Poimboeuf <jpoimboe@...hat.com>
Tested-by: Alexei Starovoitov <ast@...nel.org>
Link: https://lore.kernel.org/r/20211026120309.785456706@infradead.org
---
 tools/objtool/check.c                 | 6 +++---
 tools/objtool/include/objtool/check.h | 1 -
 2 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index 8ab6f24..ce3c25f 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -701,7 +701,7 @@ static int create_mcount_loc_sections(struct objtool_file *file)
 		return 0;
 
 	idx = 0;
-	list_for_each_entry(insn, &file->mcount_loc_list, mcount_loc_node)
+	list_for_each_entry(insn, &file->mcount_loc_list, call_node)
 		idx++;
 
 	sec = elf_create_section(file->elf, "__mcount_loc", 0, sizeof(unsigned long), idx);
@@ -709,7 +709,7 @@ static int create_mcount_loc_sections(struct objtool_file *file)
 		return -1;
 
 	idx = 0;
-	list_for_each_entry(insn, &file->mcount_loc_list, mcount_loc_node) {
+	list_for_each_entry(insn, &file->mcount_loc_list, call_node) {
 
 		loc = (unsigned long *)sec->data->d_buf + idx;
 		memset(loc, 0, sizeof(unsigned long));
@@ -1051,7 +1051,7 @@ static void annotate_call_site(struct objtool_file *file,
 
 		insn->type = INSN_NOP;
 
-		list_add_tail(&insn->mcount_loc_node, &file->mcount_loc_list);
+		list_add_tail(&insn->call_node, &file->mcount_loc_list);
 		return;
 	}
 }
diff --git a/tools/objtool/include/objtool/check.h b/tools/objtool/include/objtool/check.h
index 07e99c2..6cfff07 100644
--- a/tools/objtool/include/objtool/check.h
+++ b/tools/objtool/include/objtool/check.h
@@ -40,7 +40,6 @@ struct instruction {
 	struct list_head list;
 	struct hlist_node hash;
 	struct list_head call_node;
-	struct list_head mcount_loc_node;
 	struct section *sec;
 	unsigned long offset;
 	unsigned int len;