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

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Date:   Mon, 23 Mar 2020 08:27:22 +0100 (CET)
From:   Miroslav Benes <mbenes@...e.cz>
To:     Peter Zijlstra <peterz@...radead.org>
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, 21 Mar 2020, Peter Zijlstra wrote:

> 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;
>  }

Yup, looks good.

Miroslav