From mboxrd@z Thu Jan  1 00:00:00 1970
From: Serj Kalichev <serj.kalichev@gmail.com>
Date: Thu, 12 Jul 2018 15:33:47 +0300
Subject: [Buildroot] BR2_LINUX_KERNEL_PATCH for linux-headers
In-Reply-To: <60e837dd-e80e-c0c3-a5b4-7cb60e87f7f3@mind.be>
References: <fea35efb-0134-f091-5cbd-30292f137b33@gmail.com>
 <60e837dd-e80e-c0c3-a5b4-7cb60e87f7f3@mind.be>
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To: buildroot@busybox.net

Thanks for the answer.
I will use BR2_GLOBAL_PATCH_DIR but with enhancement.
It's not suitable for linux and linux-headers to create dirs like 
linux/4.9.80. Minor version number is not useful for kernel patches. The 
dirs like linux/4.0.x is better.
So I create a file in my external tree:

LINUX_VERSION_S := $(subst ., , $(strip $(LINUX_VERSION)))
LINUX_VERSION_X := $(word 1, $(LINUX_VERSION_S)).$(word 2, 
$(LINUX_VERSION_S)).x

define LINUX_APPLY_MAJOR_PATCHES
<------>$(Q)( \
<------>for D in $(PATCH_BASE_DIRS); do \
<------>? if test -d $${D}/$($(PKG)_VERSION_X); then \
<------>??? $(APPLY_PATCHES) $(@D) $${D}/$($(PKG)_VERSION_X) \*.patch 
\*.patch.$(ARCH) || exit 1; \
<------>? fi; \
<------>done; \
<------>)
endef

LINUX_POST_PATCH_HOOKS += LINUX_APPLY_MAJOR_PATCHES

The file for linux-headers is the same.
So buildroot will use dirs like "4.9.x" to patch linux and 
linux-headers. Maybe it will be useful for someone.

12.07.2018 00:02, Arnout Vandecappelle ?????:
>
> On 11-07-18 16:32, Serj Kalichev wrote:
>> Hello.
>>
>> Both linux and linux-headers package use BR2_LINUX_KERNEL_PATCH. But
>> BR2_LINUX_KERNEL_PATCH is available if BR2_LINUX_KERNEL is selected. I want to
>> build toolchain only. And don't want to build linux kernel. So I deselect
>> BR2_LINUX_KERNEL and lose BR2_LINUX_KERNEL_PATCH for linux-headers.
>>
>> I think BR2_LINUX_KERNEL_PATCH must not depend on BR2_LINUX_KERNEL.
>   It's not easy to do that properly, because you'd still need to go to the kernel
> menu to set the kernel patch list.
>
>   Anyway, we consider BR2_LINUX_KERNEL_PATCH as deprecated. Use
> BR2_GLOBAL_PATCH_DIR instead, and add your patches in the linux-headers
> subdirectory of that directory.
>
>   Regards,
>   Arnout
>