Re: [PATCH] arm64: make atomic helpers __always_inline

[Will Deacon]

Hi Arnd,

On Fri, Jan 08, 2021 at 10:19:56AM +0100, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@xxxxxxxx>
> 
> With UBSAN enabled and building with clang, there are occasionally
> warnings like
> 
> WARNING: modpost: vmlinux.o(.text+0xc533ec): Section mismatch in reference from the function arch_atomic64_or() to the variable .init.data:numa_nodes_parsed
> The function arch_atomic64_or() references
> the variable __initdata numa_nodes_parsed.
> This is often because arch_atomic64_or lacks a __initdata
> annotation or the annotation of numa_nodes_parsed is wrong.
> 
> for functions that end up not being inlined as intended but operating
> on __initdata variables. Mark these as __always_inline, along with
> the corresponding asm-generic wrappers.

Hmm, I don't fully grok this. Why does it matter if a non '__init' function
is called with a pointer to some '__initdata'? Or is the reference coming
from somewhere else? (where?).

Will