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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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46d075be58
Change2d1b202762("powerpc: Fixup lwsync at runtime") removed __SUBARCH_HAS_LWSYNC, causing smp_wmb to revert back to eieio for all CPUs. This restores the behaviour intorduced in74f0609526("powerpc: Optimise smp_wmb on 64-bit processors"). Signed-off-by: Nick Piggin <npiggin@suse.de> Signed-off-by: Paul Mackerras <paulus@samba.org>
49 lines
1.0 KiB
C
49 lines
1.0 KiB
C
#ifndef _ASM_POWERPC_SYNCH_H
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#define _ASM_POWERPC_SYNCH_H
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#ifdef __KERNEL__
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#include <linux/stringify.h>
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#include <asm/feature-fixups.h>
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#if defined(__powerpc64__) || defined(CONFIG_PPC_E500MC)
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#define __SUBARCH_HAS_LWSYNC
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#endif
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#ifndef __ASSEMBLY__
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extern unsigned int __start___lwsync_fixup, __stop___lwsync_fixup;
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extern void do_lwsync_fixups(unsigned long value, void *fixup_start,
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void *fixup_end);
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static inline void eieio(void)
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{
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__asm__ __volatile__ ("eieio" : : : "memory");
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}
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static inline void isync(void)
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{
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__asm__ __volatile__ ("isync" : : : "memory");
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}
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#endif /* __ASSEMBLY__ */
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#if defined(__powerpc64__)
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# define LWSYNC lwsync
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#elif defined(CONFIG_E500)
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# define LWSYNC \
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START_LWSYNC_SECTION(96); \
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sync; \
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MAKE_LWSYNC_SECTION_ENTRY(96, __lwsync_fixup);
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#else
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# define LWSYNC sync
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#endif
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#ifdef CONFIG_SMP
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#define ISYNC_ON_SMP "\n\tisync\n"
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#define LWSYNC_ON_SMP stringify_in_c(LWSYNC) "\n"
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#else
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#define ISYNC_ON_SMP
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#define LWSYNC_ON_SMP
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#endif
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#endif /* __KERNEL__ */
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#endif /* _ASM_POWERPC_SYNCH_H */
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