linux-kernel - Re: [PATCH v4 09/18] x86/static_call: Add out-of-line static call implementation

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Date:   Wed, 6 May 2020 18:16:15 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     x86@...nel.org
Cc:     linux-kernel@...r.kernel.org, rostedt@...dmis.org,
        mhiramat@...nel.org, bristot@...hat.com, jbaron@...mai.com,
        torvalds@...ux-foundation.org, tglx@...utronix.de,
        mingo@...nel.org, namit@...are.com, hpa@...or.com, luto@...nel.org,
        ard.biesheuvel@...aro.org, jpoimboe@...hat.com,
        pbonzini@...hat.com, mathieu.desnoyers@...icios.com
Subject: Re: [PATCH v4 09/18] x86/static_call: Add out-of-line static call
 implementation

On Fri, May 01, 2020 at 10:28:58PM +0200, Peter Zijlstra wrote:

> +#define ARCH_DEFINE_STATIC_CALL_TRAMP(name, func)			\
> +	asm(".pushsection .text, \"ax\"				\n"	\
> +	    ".align 4						\n"	\
> +	    ".globl " STATIC_CALL_TRAMP_STR(name) "		\n"	\
> +	    STATIC_CALL_TRAMP_STR(name) ":			\n"	\
> +	    "	jmp.d32 " #func "				\n"	\

I remembered Nick asked this to be .byte 0xe9; .long #func - (.+4); last
time, now done.

> +	    ".type " STATIC_CALL_TRAMP_STR(name) ", @function	\n"	\
> +	    ".size " STATIC_CALL_TRAMP_STR(name) ", . - " STATIC_CALL_TRAMP_STR(name) " \n" \
> +	    ".popsection					\n")