[dpdk-dev] [PATCH v3] kernel/linux: fix kernel dir for meson

[Bruce Richardson]

On Wed, Dec 04, 2019 at 10:18:21PM +0800, Ye Xiaolong wrote:
> On 12/04, Luca Boccassi wrote:
> >On Tue, 2019-12-03 at 23:59 +0800, Xiaolong Ye wrote:
> >> kernel_dir option in meson build is equivalent to RTE_KERNELDIR in
> >> make
> >> system, for cross-compilation case, users would specify it as local
> >> kernel src dir like
> >> 
> >> /<user local dir>/target-arm_glibc/linux-arm/linux-4.19.81/
> >> 
> >> Current meson build would fail to compile kernel module if user
> >> specify
> >> kernel_dir as above, this patch fixes this issue.
> >> 
> >> After this change, for normal build case, user can specify
> >> /lib/modules/<kernel_version> or /lib/modules/<kernel_version>/build
> >> as
> >> kernel_dir. For cross compilation case, user can specify any
> >> directory
> >> that contains kernel source code as the kernel_dir.
> >> 
> >> Fixes: 317832f97c16 ("kernel/linux: fix modules install path")
> >> Cc: 
> >> stable at dpdk.org
> >> 
> >> Cc: 
> >> iryzhov at nfware.com
> >> 
> >> 
> >> Signed-off-by: Xiaolong Ye <
> >> xiaolong.ye at intel.com
> >
> >The convention used by upstream and all distros is that kernel headers
> >are in <version>/build. Why can't the cross compilation case also
> >follow this convention, rather than adding complications to the
> 
> Yes, cross-compilation can follow this convention, but one common case is that
> users download and put kernel src (the same kernel that's running in the target machine)
> to one arbitrary dir, he then use this dir as kernel_dir to build kernel modules,
> it's extra burden for users to create extra build dir to hold the kernel headers.
> 

As part of the build of the kernel, do you not do a "modules_install" step,
which should set up things correctly for later builds?

/Bruce