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x86/tlb: Move __flush_tlb_global() 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 second step, move __flush_tlb_global() out of line and hide the
native function. The latter can be static when CONFIG_PARAVIRT is
disabled.

Consolidate the namespace 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/20200421092559.336916818@linutronix.de
This commit is contained in:
Thomas Gleixner
2020-04-21 11:20:33 +02:00
committed by Borislav Petkov
parent 2faf153bb7
commit cd30d26cf3
4 changed files with 44 additions and 45 deletions
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9
arch/x86/kernel/paravirt.c
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@@ -160,15 +160,6 @@ unsigned paravirt_patch_insns(void *insn_buff, unsigned len,
return insn_len;
}
/*
* Global pages have to be flushed a bit differently. Not a real
* performance problem because this does not happen often.
*/
static void native_flush_tlb_global(void)
{
__native_flush_tlb_global();
}
static void native_flush_tlb_one_user(unsigned long addr)
{
__native_flush_tlb_one_user(addr);