Hi Khem and Bruce, I got the patch from raspberry pi github and it looked like it put the header into include/uapi/linux/dma-heap.h, for kernel 5.4 it doesn't look like there is a need for a Kbuild file. Are any special steps needed for exporting the header (I thought kernel 5.4 exports everything from include/uapi directory) ? The linux-libc-headers sound like the issue. Thanks for the pointers, I will dig up further based on the suggestions and revert.
On Mon, Feb 22, 2021 at 5:14 PM Bruce Ashfield <[email protected]> wrote: > On Mon, Feb 22, 2021 at 7:52 PM Karthik Poduval > <[email protected]> wrote: > > > > I have a 5.4 kernel where I applied a patch (using a .scc file) from > > kernel 5.6 which brings in dmabuf heaps. > > > > The patch exports a uapi header > > include/uapi/linux/dma-heap.h. > > I am trying to write an application that uses dmabuf with a recipe (no > > special DEPENDS). > > > > It is able to find > > #include<linux/dma-buf.h> > > but not > > #include<linux/dma-heap.h> (this file is introduced in the patch) > > > > I looked at the recipe's sysroot > > recipe-sysroot/usr/linux/include > > > That's coming from the linux-libc-headers, your new upi header is not > part of the libc-headers package, so it won't show up there. And no, > it shouldn't be part of that recipe and the libc-headers should not be > generated from the current state of whatever kernel is being built. > > You need to arrange for it to be exported and staged separately (look > for examples of 'sysroot_stage' variants in the meta-data, you can > bbappend the behaviour to your kernel recipe), or your code can look > for the header in the kernel shared workdir (STAGING_KERNEL_BUILDDIR) > by adding that to your include paths in the recipe. > > As khem also mentioned, you'll need to make sure that the uapi header > is not just patched in, but properly exported. > > Bruce > > > > > and dma-buf.h is there but not dma-heap.h > > > > Why is the header not being imported ? > > > > -- > > Regards, > > Karthik Poduval > > > > > > > > > -- > - Thou shalt not follow the NULL pointer, for chaos and madness await > thee at its end > - "Use the force Harry" - Gandalf, Star Trek II > -- Regards, Karthik Poduval
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