Re: [PATCH v6 2/8] module: use relative references for __ksymtab entries
From: Linus Torvalds <torvalds@linux-foundation.org>
Date: 2017-12-27 20:07:39
Also in:
linux-arm-kernel, linux-mips, lkml, sparclinux
On Wed, Dec 27, 2017 at 12:50 AM, Ard Biesheuvel [off-list ref] wrote:
quoted hunk ↗ jump to hunk
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