Greg Kroah-Hartman
598cf27219
Link: https://lore.kernel.org/r/20260217200002.683975158@linuxfoundation.org Tested-by: Florian Fainelli <florian.fainelli@broadcom.com> Tested-by: Takeshi Ogasawara <takeshi.ogasawara@futuring-girl.com> Tested-by: Peter Schneider <pschneider1968@googlemail.com> Tested-by: Jon Hunter <jonathanh@nvidia.com> Tested-by: Salvatore Bonaccorso <carnil@debian.org> Tested-by: Brett A C Sheffield <bacs@librecast.net> Tested-by: Mark Brown <broonie@kernel.org> Tested-by: Luna Jernberg <droidbittin@gmail.com> Tested-by: Ronald Warsow <rwarsow@gmx.de> Tested-by: Justin M. Forbes <jforbes@fedoraproject.org> Tested-by: Ron Economos <re@w6rz.net> Tested-by: Miguel Ojeda <ojeda@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
63 lines
1.4 KiB
C
63 lines
1.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2023 Loongson Technology Corporation Limited
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*
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* Based on arch/arm64/include/asm/jump_label.h
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*/
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#ifndef __ASM_JUMP_LABEL_H
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#define __ASM_JUMP_LABEL_H
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#ifndef __ASSEMBLER__
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#include <linux/types.h>
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#include <linux/stringify.h>
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#include <asm/asm.h>
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#define JUMP_LABEL_NOP_SIZE 4
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#ifdef CONFIG_32BIT
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#define JUMP_LABEL_TYPE ".long "
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#else
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#define JUMP_LABEL_TYPE ".quad "
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#endif
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/* This macro is also expanded on the Rust side. */
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#define JUMP_TABLE_ENTRY(key, label) \
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".pushsection __jump_table, \"aw\" \n\t" \
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".align " __stringify(PTRLOG) " \n\t" \
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".long 1b - ., " label " - . \n\t" \
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JUMP_LABEL_TYPE key " - . \n\t" \
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".popsection \n\t"
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#define ARCH_STATIC_BRANCH_ASM(key, label) \
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"1: nop \n\t" \
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JUMP_TABLE_ENTRY(key, label)
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static __always_inline bool arch_static_branch(struct static_key * const key, const bool branch)
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{
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asm goto(
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ARCH_STATIC_BRANCH_ASM("%0", "%l[l_yes]")
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: : "i"(&((char *)key)[branch]) : : l_yes);
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return false;
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l_yes:
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return true;
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}
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static __always_inline bool arch_static_branch_jump(struct static_key * const key, const bool branch)
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{
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asm goto(
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"1: b %l[l_yes] \n\t"
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JUMP_TABLE_ENTRY("%0", "%l[l_yes]")
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: : "i"(&((char *)key)[branch]) : : l_yes);
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return false;
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l_yes:
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return true;
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}
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#endif /* __ASSEMBLER__ */
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#endif /* __ASM_JUMP_LABEL_H */
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