diff options
| -rw-r--r-- | arch/x86/mm/pageattr.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c index 19781b0ab4b4..5160334f9095 100644 --- a/arch/x86/mm/pageattr.c +++ b/arch/x86/mm/pageattr.c @@ -840,6 +840,20 @@ static int __should_split_large_page(pte_t *kpte, unsigned long address, } /* + * Optimization: If the requested pgprot is the same as the current + * pgprot, then the large page can be preserved and no updates are + * required independent of alignment and length of the requested + * range. The above already established that the current pgprot is + * correct, which in consequence makes the requested pgprot correct + * as well if it is the same. The static protection scan below will + * not come to a different conclusion. + */ + if (pgprot_val(req_prot) == pgprot_val(old_prot)) { + cpa_inc_lp_sameprot(level); + return 0; + } + + /* * Make sure that the requested pgprot does not violate the static * protections. Check the full large page whether one of the pages * in it results in a different pgprot than the first one of the |