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>
56 lines
1.3 KiB
C
56 lines
1.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __ASM_POWERPC_CPU_HAS_FEATURE_H
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#define __ASM_POWERPC_CPU_HAS_FEATURE_H
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#ifndef __ASSEMBLER__
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#include <linux/bug.h>
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#include <asm/cputable.h>
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static __always_inline bool early_cpu_has_feature(unsigned long feature)
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{
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return !!((CPU_FTRS_ALWAYS & feature) ||
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(CPU_FTRS_POSSIBLE & cur_cpu_spec->cpu_features & feature));
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}
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#ifdef CONFIG_JUMP_LABEL_FEATURE_CHECKS
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#include <linux/jump_label.h>
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#define NUM_CPU_FTR_KEYS BITS_PER_LONG
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extern struct static_key_true cpu_feature_keys[NUM_CPU_FTR_KEYS];
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static __always_inline bool cpu_has_feature(unsigned long feature)
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{
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int i;
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BUILD_BUG_ON(!__builtin_constant_p(feature));
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BUILD_BUG_ON(__builtin_popcountl(feature) > 1);
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#ifdef CONFIG_JUMP_LABEL_FEATURE_CHECK_DEBUG
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if (!static_key_feature_checks_initialized) {
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printk("Warning! cpu_has_feature() used prior to jump label init!\n");
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dump_stack();
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return early_cpu_has_feature(feature);
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}
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#endif
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if (CPU_FTRS_ALWAYS & feature)
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return true;
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if (!(CPU_FTRS_POSSIBLE & feature))
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return false;
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i = __builtin_ctzl(feature);
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return static_branch_likely(&cpu_feature_keys[i]);
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}
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#else
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static __always_inline bool cpu_has_feature(unsigned long feature)
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{
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return early_cpu_has_feature(feature);
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}
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#endif
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#endif /* __ASSEMBLER__ */
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#endif /* __ASM_POWERPC_CPU_HAS_FEATURE_H */
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