Re: [PATCH v6 2/8] module: use relative references for __ksymtab entries

[Linus Torvalds]

On Wed, Dec 27, 2017 at 12:50 AM, Ard Biesheuvel
<ard.biesheuvel@xxxxxxxxxx> wrote:
> diff --git a/include/linux/compiler.h b/include/linux/compiler.h
> index 52e611ab9a6c..fe752d365334 100644
> --- a/include/linux/compiler.h
> +++ b/include/linux/compiler.h
> @@ -327,4 +327,15 @@ static __always_inline void __write_once_size(volatile void *p, void *res, int s
>         compiletime_assert(__native_word(t),                            \
>                 "Need native word sized stores/loads for atomicity.")
>
> +/*
> + * Force the compiler to emit 'sym' as a symbol, so that we can reference
> + * it from inline assembler. Necessary in case 'sym' could be inlined
> + * otherwise, or eliminated entirely due to lack of references that are
> + * visibile to the compiler.
> + */
> +#define __ADDRESSABLE(sym) \
> +       static void *__attribute__((section(".discard.text"), used))    \
> +               __PASTE(__discard_##sym, __LINE__)(void)                \
> +                       { return (void *)&sym; }                        \
> +
>  #endif /* __LINUX_COMPILER_H */

Isn't this logically the point where you should add the arm64
vmlinux.lds.S change, and explain how ".discard.text" turns into
".init.discard.text" for some odd arm64 reason?

                   Linus