linux-kernel - Re: [PATCH v2 17/19] objtool: Optimize !vmlinux.o again

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Message-ID: <20200321161151.GB3323@worktop.programming.kicks-ass.net>
Date:   Sat, 21 Mar 2020 17:11:51 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Miroslav Benes <mbenes@...e.cz>
Cc:     tglx@...utronix.de, jpoimboe@...hat.com,
        linux-kernel@...r.kernel.org, x86@...nel.org, mhiramat@...nel.org,
        brgerst@...il.com
Subject: Re: [PATCH v2 17/19] objtool: Optimize !vmlinux.o again

On Sat, Mar 21, 2020 at 04:14:21PM +0100, Peter Zijlstra wrote:
> On Fri, Mar 20, 2020 at 05:20:47PM +0100, Miroslav Benes wrote:
> 
> > I think there is one more missing in create_orc_entry().
> 
> I'm thikning you're quite right about that.... lemme see what to do
> about that.

---
--- a/tools/objtool/elf.c
+++ b/tools/objtool/elf.c
@@ -472,6 +472,14 @@ static int read_symbols(struct elf *elf)
 	return -1;
 }

+void elf_add_rela(struct elf *elf, struct rela *rela)
+{
+	struct section *sec = rela->sec;
+
+	list_add_tail(&rela->list, &sec->rela_list);
+	elf_hash_add(elf->rela_hash, &rela->hash, rela_hash(rela));
+}
+
 static int read_relas(struct elf *elf)
 {
 	struct section *sec;
@@ -519,8 +527,7 @@ static int read_relas(struct elf *elf)
 				return -1;
 			}

-			list_add_tail(&rela->list, &sec->rela_list);
-			elf_hash_add(elf->rela_hash, &rela->hash, rela_hash(rela));
+			elf_add_rela(elf, rela);
 			nr_rela++;
 		}
 		max_rela = max(max_rela, nr_rela);
--- a/tools/objtool/elf.h
+++ b/tools/objtool/elf.h
@@ -127,6 +127,7 @@ struct section *elf_create_rela_section(
 int elf_rebuild_rela_section(struct section *sec);
 int elf_write(struct elf *elf);
 void elf_close(struct elf *elf);
+void elf_add_rela(struct elf *elf, struct rela *rela);

 #define for_each_sec(file, sec)						\
 	list_for_each_entry(sec, &file->elf->sections, list)
--- a/tools/objtool/orc_gen.c
+++ b/tools/objtool/orc_gen.c
@@ -111,8 +111,7 @@ static int create_orc_entry(struct elf *
 	rela->offset = idx * sizeof(int);
 	rela->sec = ip_relasec;

-	list_add_tail(&rela->list, &ip_relasec->rela_list);
-	hash_add(elf->rela_hash, &rela->hash, rela_hash(rela));
+	elf_add_rela(elf, rela);

 	return 0;
 }