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x86/mm: Add comments to clarify which TLB-flush functions are supposed to flush what

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Per popular request..

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: David Laight <David.Laight@aculab.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Eduardo Valentin <eduval@amazon.com>
Cc: Greg KH <gregkh@linuxfoundation.org>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Juergen Gross <jgross@suse.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Will Deacon <will.deacon@arm.com>
Cc: aliguori@amazon.com
Cc: daniel.gruss@iaik.tugraz.at
Cc: hughd@google.com
Cc: keescook@google.com
Cc: linux-mm@kvack.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Peter Zijlstra 2017-12-05 13:34:52 +01:00 committed by Ingo Molnar
parent b5fc6d9438
commit 3f67af51e5
1 changed files with 21 additions and 2 deletions
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23
arch/x86/include/asm/tlbflush.h
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@ -228,6 +228,9 @@ static inline void cr4_set_bits_and_update_boot(unsigned long mask)
extern void initialize_tlbstate_and_flush(void);
/*
* flush the entire current user mapping
*/
static inline void __native_flush_tlb(void)
{
/*
@ -240,6 +243,9 @@ static inline void __native_flush_tlb(void)
preempt_enable();
}
/*
* flush everything
*/
static inline void __native_flush_tlb_global(void)
{
unsigned long cr4, flags;
@ -269,17 +275,27 @@ static inline void __native_flush_tlb_global(void)
raw_local_irq_restore(flags);
}
/*
* flush one page in the user mapping
*/
static inline void __native_flush_tlb_single(unsigned long addr)
{
asm volatile("invlpg (%0)" ::"r" (addr) : "memory");
}
/*
* flush everything
*/
static inline void __flush_tlb_all(void)
{
if (boot_cpu_has(X86_FEATURE_PGE))
if (boot_cpu_has(X86_FEATURE_PGE)) {
__flush_tlb_global();
else
} else {
/*
* !PGE -> !PCID (setup_pcid()), thus every flush is total.
*/
__flush_tlb();
}
/*
* Note: if we somehow had PCID but not PGE, then this wouldn't work --
@ -290,6 +306,9 @@ static inline void __flush_tlb_all(void)
*/
}
/*
* flush one page in the kernel mapping
*/
static inline void __flush_tlb_one(unsigned long addr)
{
count_vm_tlb_event(NR_TLB_LOCAL_FLUSH_ONE);