linux-kernel - Re: [PATCH 2/3] ia64: remove unneeded header includes from <asm/mca.h>

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Date:   Mon, 31 Aug 2020 18:00:18 +0300
From:   Ard Biesheuvel <ardb@...nel.org>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     Tony Luck <tony.luck@...el.com>, Fenghua Yu <fenghua.yu@...el.com>,
        linux-ia64@...r.kernel.org, Randy Dunlap <rdunlap@...radead.org>,
        linux-kbuild@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Dmitry Safonov <0x7f454c46@...il.com>,
        afzal mohammed <afzal.mohd.ma@...il.com>,
        linux-efi <linux-efi@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/3] ia64: remove unneeded header includes from <asm/mca.h>

On Sat, 29 Aug 2020 at 08:16, Masahiro Yamada <masahiroy@...nel.org> wrote:
>
> <asm/mca.h> includes too many unneeded headers.
>
> This commit cuts off a lot of header includes.
>
> What we need to include are:
>
>  - <linux/percpu.h> for DECLARE_PER_CPU(u64, ia64_mca_pal_base)
>  - <linux/threads.h> for NR_CPUS
>  - <linux/types.h> for u8, u64, size_t, etc.
>  - <asm/ptrace.h> for KERNEL_STACK_SIZE
>
> The other header includes are actually unneeded.
>
> <asm/mca.h> previously included 436 headers, and now it includes
> only 138. I confirmed <asm/mca.h> is still self-contained.
>
> Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>

Acked-by: Ard Biesheuvel <ardb@...nel.org>

> ---
>
>  arch/ia64/include/asm/mca.h | 9 +++------
>  arch/ia64/kernel/efi.c      | 1 +
>  arch/ia64/kernel/mca.c      | 1 +
>  3 files changed, 5 insertions(+), 6 deletions(-)
>
> diff --git a/arch/ia64/include/asm/mca.h b/arch/ia64/include/asm/mca.h
> index c92b9c15962c..05805249296c 100644
> --- a/arch/ia64/include/asm/mca.h
> +++ b/arch/ia64/include/asm/mca.h
> @@ -14,13 +14,10 @@
>
>  #if !defined(__ASSEMBLY__)
>
> -#include <linux/interrupt.h>
> +#include <linux/percpu.h>
> +#include <linux/threads.h>
>  #include <linux/types.h>
> -
> -#include <asm/param.h>
> -#include <asm/sal.h>
> -#include <asm/processor.h>
> -#include <asm/mca_asm.h>
> +#include <asm/ptrace.h>
>
>  #define IA64_MCA_RENDEZ_TIMEOUT                (20 * 1000)     /* value in milliseconds - 20 seconds */
>
> diff --git a/arch/ia64/kernel/efi.c b/arch/ia64/kernel/efi.c
> index f932b25fb817..b6bb718ed1ff 100644
> --- a/arch/ia64/kernel/efi.c
> +++ b/arch/ia64/kernel/efi.c
> @@ -39,6 +39,7 @@
>  #include <asm/meminit.h>
>  #include <asm/processor.h>
>  #include <asm/mca.h>
> +#include <asm/sal.h>
>  #include <asm/setup.h>
>  #include <asm/tlbflush.h>
>
> diff --git a/arch/ia64/kernel/mca.c b/arch/ia64/kernel/mca.c
> index 17151269d655..3911c561d2bb 100644
> --- a/arch/ia64/kernel/mca.c
> +++ b/arch/ia64/kernel/mca.c
> @@ -96,6 +96,7 @@
>  #include <asm/ptrace.h>
>  #include <asm/sal.h>
>  #include <asm/mca.h>
> +#include <asm/mca_asm.h>
>  #include <asm/kexec.h>
>
>  #include <asm/irq.h>
> --
> 2.25.1
>