Commit f5430f93 authored by Jeremy Fitzhardinge's avatar Jeremy Fitzhardinge Committed by Ingo Molnar

x86: update reference for PAE tlb flushing

Remove bogus reference to "Pentium-II erratum A13" and point to the
actual canonical source of information about what requirements x86
processors have for PAE pagetable updates.
Signed-off-by: default avatarJeremy Fitzhardinge <jeremy@xensource.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent edd6bcd8
...@@ -80,8 +80,10 @@ static inline void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmd) ...@@ -80,8 +80,10 @@ static inline void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmd)
set_pud(pudp, __pud(__pa(pmd) | _PAGE_PRESENT)); set_pud(pudp, __pud(__pa(pmd) | _PAGE_PRESENT));
/* /*
* Pentium-II erratum A13: in PAE mode we explicitly have to flush * According to Intel App note "TLBs, Paging-Structure Caches,
* the TLB via cr3 if the top-level pgd is changed... * and Their Invalidation", April 2007, document 317080-001,
* section 8.1: in PAE mode we explicitly have to flush the
* TLB via cr3 if the top-level pgd is changed...
*/ */
if (mm == current->active_mm) if (mm == current->active_mm)
write_cr3(read_cr3()); write_cr3(read_cr3());
......
...@@ -98,8 +98,10 @@ static inline void pud_clear(pud_t *pudp) ...@@ -98,8 +98,10 @@ static inline void pud_clear(pud_t *pudp)
set_pud(pudp, __pud(0)); set_pud(pudp, __pud(0));
/* /*
* Pentium-II erratum A13: in PAE mode we explicitly have to flush * According to Intel App note "TLBs, Paging-Structure Caches,
* the TLB via cr3 if the top-level pgd is changed... * and Their Invalidation", April 2007, document 317080-001,
* section 8.1: in PAE mode we explicitly have to flush the
* TLB via cr3 if the top-level pgd is changed...
* *
* Make sure the pud entry we're updating is within the * Make sure the pud entry we're updating is within the
* current pgd to avoid unnecessary TLB flushes. * current pgd to avoid unnecessary TLB flushes.
......
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