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Message-ID: <CAKv+Gu-2NUzsakN2rcM_5fqD0ubr+6ZXSc+5sjZZPbU3wj_Xsg@mail.gmail.com> Date: Wed, 27 Dec 2017 20:11:19 +0000 From: Ard Biesheuvel <ard.biesheuvel@...aro.org> To: Linus Torvalds <torvalds@...ux-foundation.org> Cc: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, "H. Peter Anvin" <hpa@...or.com>, Ralf Baechle <ralf@...ux-mips.org>, Arnd Bergmann <arnd@...db.de>, Heiko Carstens <heiko.carstens@...ibm.com>, Kees Cook <keescook@...omium.org>, Will Deacon <will.deacon@....com>, Michael Ellerman <mpe@...erman.id.au>, Thomas Garnier <thgarnie@...gle.com>, Thomas Gleixner <tglx@...utronix.de>, "Serge E. Hallyn" <serge@...lyn.com>, Bjorn Helgaas <bhelgaas@...gle.com>, Benjamin Herrenschmidt <benh@...nel.crashing.org>, Russell King <linux@...linux.org.uk>, Paul Mackerras <paulus@...ba.org>, Catalin Marinas <catalin.marinas@....com>, "David S. Miller" <davem@...emloft.net>, Petr Mladek <pmladek@...e.com>, Ingo Molnar <mingo@...hat.com>, James Morris <james.l.morris@...cle.com>, Andrew Morton <akpm@...ux-foundation.org>, Nicolas Pitre <nico@...aro.org>, Josh Poimboeuf <jpoimboe@...hat.com>, Steven Rostedt <rostedt@...dmis.org>, Martin Schwidefsky <schwidefsky@...ibm.com>, Sergey Senozhatsky <sergey.senozhatsky@...il.com>, Jessica Yu <jeyu@...nel.org>, linux-arm-kernel@...ts.infradead.org, linux-mips <linux-mips@...ux-mips.org>, ppc-dev <linuxppc-dev@...ts.ozlabs.org>, linux-s390 <linux-s390@...r.kernel.org>, sparclinux@...r.kernel.org, "the arch/x86 maintainers" <x86@...nel.org>, Ingo Molnar <mingo@...nel.org> Subject: Re: [PATCH v6 2/8] module: use relative references for __ksymtab entries On 27 December 2017 at 20:07, Linus Torvalds <torvalds@...ux-foundation.org> wrote: > On Wed, Dec 27, 2017 at 12:50 AM, Ard Biesheuvel > <ard.biesheuvel@...aro.org> 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?
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