[Buildroot] BR2_LINUX_KERNEL_PATCH for linux-headers

[Arnout Vandecappelle <arnout@mind.be>]

On 12-07-18 14:33, Serj Kalichev wrote:
> 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.

 Well, you don't need to create a version-specific directory at all, just put
your patches under linux/. Except if you want to use the same GLOBAL_PATCH_DIR
for different configurations with different kernel versions. But even then, you
can just have different patch directories. I typically have something like:

board/project-foo/common/patches/busybox/....patch
                  board1/patches/linux/.....patch
                                 linux-headers -> linux
                  board2/patches/linux/.....patch
                                 ubuut/.....patch

BR2_GLOBAL_PATCH_DIR="$(BR2_EXTERNAL_FOO_PATH)/board/project-foo/common/patches
$(BR2_EXTERNAL_FOO_PATH)/board/project-foo/board1/patches"


 Regards,
 Arnout

> 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
>>
> 

-- 
Arnout Vandecappelle                          arnout at mind be
Senior Embedded Software Architect            +32-16-286500
Essensium/Mind                                http://www.mind.be
G.Geenslaan 9, 3001 Leuven, Belgium           BE 872 984 063 RPR Leuven
LinkedIn profile: http://www.linkedin.com/in/arnoutvandecappelle
GPG fingerprint:  7493 020B C7E3 8618 8DEC 222C 82EB F404 F9AC 0DDF