I am on my ubuntu with Linux 5.8.0-40 Kernel. I am trying to change the kernel to 4.19 along with the RT preempt patch. These are the steps I followed.
- Downloaded the tarball for 4.19 from here and extracted it.
- Downloaded the patch from here and extracted it.
- Applied the patch as stated in the link
- make menuconfig and enable fully preemptible option
- make -j4
- make bzImage
This is where I face issues
net/core/skbuff.c: In function ‘__napi_alloc_skb’: net/core/skbuff.c:500:2: error: ‘pfmemalloc’ undeclared (first use in this function); did you mean ‘pmd_alloc’? 500 | pfmemalloc = nc->page.pfmemalloc; | ^~~~ | pmd_alloc
does anybody knows how to get around this thing? Google search solutions didn't help.