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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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57c4f43043
The flush tlb optimization code has logical issue on UV platform. It doesn't flush the full range at all, since it simply ignores its 'end' parameter (and hence also the "all" indicator) in uv_flush_tlb_others() function. Cliff's notes: | I tested the patch on a UV. It has the effect of either | clearing 1 or all TLBs in a cpu. I added some debugging to | test for the cases when clearing all TLBs is overkill, and in | practice it happens very seldom. Reported-by: Jan Beulich <jbeulich@suse.com> Signed-off-by: Alex Shi <alex.shi@intel.com> Signed-off-by: Cliff Wickman <cpw@sgi.com> Tested-by: Cliff Wickman <cpw@sgi.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Ingo Molnar <mingo@kernel.org>
36 lines
1.0 KiB
C
36 lines
1.0 KiB
C
#ifndef _ASM_X86_UV_UV_H
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#define _ASM_X86_UV_UV_H
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enum uv_system_type {UV_NONE, UV_LEGACY_APIC, UV_X2APIC, UV_NON_UNIQUE_APIC};
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struct cpumask;
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struct mm_struct;
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#ifdef CONFIG_X86_UV
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extern enum uv_system_type get_uv_system_type(void);
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extern int is_uv_system(void);
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extern void uv_cpu_init(void);
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extern void uv_nmi_init(void);
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extern void uv_system_init(void);
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extern const struct cpumask *uv_flush_tlb_others(const struct cpumask *cpumask,
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struct mm_struct *mm,
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unsigned long start,
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unsigned long end,
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unsigned int cpu);
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#else /* X86_UV */
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static inline enum uv_system_type get_uv_system_type(void) { return UV_NONE; }
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static inline int is_uv_system(void) { return 0; }
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static inline void uv_cpu_init(void) { }
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static inline void uv_system_init(void) { }
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static inline const struct cpumask *
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uv_flush_tlb_others(const struct cpumask *cpumask, struct mm_struct *mm,
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unsigned long start, unsigned long end, unsigned int cpu)
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{ return cpumask; }
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#endif /* X86_UV */
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#endif /* _ASM_X86_UV_UV_H */
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