On 27 December 2017 at 20:07, Linus Torvalds
<torvalds@xxxxxxxxxxxxxxxxxxxx> wrote:
> 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?
>
I tried to keep the generic patches generic, so perhaps I should just
put the arm64 vmlinux.lds.S change in a patch on its own?
