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x86/tlb: Move __flush_tlb_one_kernel() out of line

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cpu_tlbstate is exported because various TLB-related functions need
access to it, but cpu_tlbstate is sensitive information which should
only be accessed by well-contained kernel functions and not be directly
exposed to modules.

As a fourth step, move __flush_tlb_one_kernel() out of line and hide
the native function. The latter can be static when CONFIG_PARAVIRT is
disabled.

Consolidate the name space while at it and remove the pointless extra
wrapper in the paravirt code.

No functional change.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Alexandre Chartre <alexandre.chartre@oracle.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20200421092559.535159540@linutronix.de
This commit is contained in:
Thomas Gleixner
2020-04-21 11:20:35 +02:00
committed by Borislav Petkov
parent 127ac915c8
commit 58430c5dba
8 changed files with 40 additions and 47 deletions
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2
arch/x86/include/asm/pgtable_32.h
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@@ -60,7 +60,7 @@ void sync_initial_page_table(void);
#define kpte_clear_flush(ptep, vaddr) \
do { \
pte_clear(&init_mm, (vaddr), (ptep)); \
__flush_tlb_one_kernel((vaddr)); \
flush_tlb_one_kernel((vaddr)); \
} while (0)
#endif /* !__ASSEMBLY__ */