Hi Nick,
On 3/22/23 19:25, Nick Desaulniers wrote:
On Fri, Feb 24, 2023 at 7:58 AM Björn Töpel <bjorn@xxxxxxxxxx> wrote:
Alexandre Ghiti <alex@xxxxxxxx> writes:
+cc linux-kbuild, llvm, Nathan, Nick
On 2/15/23 15:36, Alexandre Ghiti wrote:
From: Alexandre Ghiti <alex@xxxxxxxx>
I tried a lot of things, but I struggle to understand, does anyone have
any idea? FYI, the same problem happens with LLVM.
Off the top of my head, no idea.
(Maybe as a follow up to this series, I wonder if pursuing
ARCH_HAS_RELR for ARCH=riscv is worthwhile?)
IIUC, the goal for using RELR is to reduce the size of a kernel image:
right now, this is not my priority, but I'll add that to my todo list
because that may be useful to distros.
Don't ask me *why*, but adding --emit-relocs to your linker flags solves
"the NULL .rela.dyn" both for GCC and LLVM.
The downside is that you end up with a bunch of .rela cruft in your
vmlinux.
There was a patch just this week to use $(OBJCOPY) to strip these from
vmlinux (for x86). Looks like x86 uses --emit-relocs for KASLR:
https://lore.kernel.org/lkml/20230320121006.4863-1-petr.pavlu@xxxxxxxx/
That's nice, that would be an interesting intermediate step until we
find the issue here as I believe it is important to have the relocations
in the init section to save memory.
Thanks for your answer Nick, really appreciated,
Alex
