linux-kernel - Re: [PATCH 2/4] Makefile: remove some unnecessary header include paths

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Date: Fri, 19 Apr 2024 17:07:12 +0200
From: Nicolas Schier <nicolas@...sle.eu>
To: Masahiro Yamada <masahiroy@...nel.org>
Cc: linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4] Makefile: remove some unnecessary header include
 paths

On Tue 16 Apr 2024 21:18:36 GMT, Masahiro Yamada wrote:
> The include directive with the double-quote form, #include "...",
> first searches for the specified header in the directory containing
> the source file.
> 
> If all local headers are included using the double-quote form instead
> of the angle bracket form, there is no need to add the local directory
> to the header search path.
> 
> drivers/gpu/drm/imagination and drivers/net/ethernet/aquantia/atlantic
> use only the double-quote form for including the local headers, and
> there are no generated sources or headers in their directories. Hence,
> the local header search path is unneeded.
> 
> The same applies to arch/loongarch/kvm/ because TRACE_INCLUDE_PATH is
> relative to include/trace/.
> 
> I guess there exist more Makefiles with unnecessary header inclusion
> paths (and more cases where it is possible to delete the header search
> path by replacing #include <...> with #include "..."), but I do not have
> an easy way to detect it.
> 
> These are unneeded inclusion paths that I happened to find.
> 
> Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
> ---
> 
>  arch/loongarch/kvm/Makefile                     | 2 --
>  drivers/gpu/drm/imagination/Makefile            | 2 --
>  drivers/net/ethernet/aquantia/atlantic/Makefile | 2 --
>  3 files changed, 6 deletions(-)
> 
> diff --git a/arch/loongarch/kvm/Makefile b/arch/loongarch/kvm/Makefile
> index 244467d7792a..7a0108a721c1 100644
> --- a/arch/loongarch/kvm/Makefile
> +++ b/arch/loongarch/kvm/Makefile
> @@ -3,8 +3,6 @@
>  # Makefile for LoongArch KVM support
>  #
>  
> -ccflags-y += -I $(srctree)/$(src)
> -
>  include $(srctree)/virt/kvm/Makefile.kvm
>  
>  obj-$(CONFIG_KVM) += kvm.o
> diff --git a/drivers/gpu/drm/imagination/Makefile b/drivers/gpu/drm/imagination/Makefile
> index ec6db8e9b403..3d9d4d40fb80 100644
> --- a/drivers/gpu/drm/imagination/Makefile
> +++ b/drivers/gpu/drm/imagination/Makefile
> @@ -1,8 +1,6 @@
>  # SPDX-License-Identifier: GPL-2.0-only OR MIT
>  # Copyright (c) 2023 Imagination Technologies Ltd.
>  
> -subdir-ccflags-y := -I$(srctree)/$(src)
> -
>  powervr-y := \
>  	pvr_ccb.o \
>  	pvr_cccb.o \
> diff --git a/drivers/net/ethernet/aquantia/atlantic/Makefile b/drivers/net/ethernet/aquantia/atlantic/Makefile
> index 8ebcc68e807f..268a055086c4 100644
> --- a/drivers/net/ethernet/aquantia/atlantic/Makefile
> +++ b/drivers/net/ethernet/aquantia/atlantic/Makefile
> @@ -8,8 +8,6 @@
>  
>  obj-$(CONFIG_AQTION) += atlantic.o
>  
> -ccflags-y += -I$(srctree)/$(src)
> -
>  atlantic-objs := aq_main.o \
>  	aq_nic.o \
>  	aq_pci_func.o \

I'm afraid drivers/net/ethernet/aquantia/atlantic/macsec/macsec_api.c, 
.../hw_atl2/hw_atl2.c and .../hw_atl2/hw_atl2_utills{,_fw}.[ch] need to 
be adjusted first.

Except for the atlantic related patch diff:
Reviewed-by: Nicolas Schier <nicolas@...sle.eu>

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