Cregit: Linux 5.19: jump

Contributors: 10
Author	Tokens	Token Proportion	Commits	Commit Proportion
Peter Zijlstra	120	60.91%	7	36.84%
Jason Baron	26	13.20%	2	10.53%
Ingo Molnar	21	10.66%	3	15.79%
Andrew Lutomirski	15	7.61%	1	5.26%
Jason Gerecke	4	2.03%	1	5.26%
Anton Blanchard	3	1.52%	1	5.26%
Josh Poimboeuf	3	1.52%	1	5.26%
Daniel Bristot de Oliveira	3	1.52%	1	5.26%
Greg Kroah-Hartman	1	0.51%	1	5.26%
Steven Rostedt	1	0.51%	1	5.26%
Total	197		19

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_X86_JUMP_LABEL_H
#define _ASM_X86_JUMP_LABEL_H

#define HAVE_JUMP_LABEL_BATCH

#include <asm/asm.h>
#include <asm/nops.h>

#ifndef __ASSEMBLY__

#include <linux/stringify.h>
#include <linux/types.h>

#define JUMP_TABLE_ENTRY				\
	".pushsection __jump_table,  \"aw\" \n\t"	\
	_ASM_ALIGN "\n\t"				\
	".long 1b - . \n\t"				\
	".long %l[l_yes] - . \n\t"			\
	_ASM_PTR "%c0 + %c1 - .\n\t"			\
	".popsection \n\t"

#ifdef CONFIG_HAVE_JUMP_LABEL_HACK

static __always_inline bool arch_static_branch(struct static_key *key, bool branch)
{
	asm_volatile_goto("1:"
		"jmp %l[l_yes] # objtool NOPs this \n\t"
		JUMP_TABLE_ENTRY
		: :  "i" (key), "i" (2 | branch) : : l_yes);

	return false;
l_yes:
	return true;
}

#else /* !CONFIG_HAVE_JUMP_LABEL_HACK */

static __always_inline bool arch_static_branch(struct static_key * const key, const bool branch)
{
	asm_volatile_goto("1:"
		".byte " __stringify(BYTES_NOP5) "\n\t"
		JUMP_TABLE_ENTRY
		: :  "i" (key), "i" (branch) : : l_yes);

	return false;
l_yes:
	return true;
}

#endif /* CONFIG_HAVE_JUMP_LABEL_HACK */

static __always_inline bool arch_static_branch_jump(struct static_key * const key, const bool branch)
{
	asm_volatile_goto("1:"
		"jmp %l[l_yes]\n\t"
		JUMP_TABLE_ENTRY
		: :  "i" (key), "i" (branch) : : l_yes);

	return false;
l_yes:
	return true;
}

extern int arch_jump_entry_size(struct jump_entry *entry);

#endif	/* __ASSEMBLY__ */

#endif

jump_label.h