The following commit has been merged into the x86/urgent branch of tip: Commit-ID: c567f2948f57bdc03ed03403ae0234085f376b7d Gitweb: https://git.kernel.org/tip/c567f2948f57bdc03ed03403ae0234085f376b7d Author: Ingo Molnar <mingo@xxxxxxxxxx> AuthorDate: Mon, 25 Mar 2024 11:47:51 +01:00 Committer: Ingo Molnar <mingo@xxxxxxxxxx> CommitterDate: Mon, 25 Mar 2024 11:54:35 +01:00 Revert "x86/mm/ident_map: Use gbpages only where full GB page should be mapped." This reverts commit d794734c9bbfe22f86686dc2909c25f5ffe1a572. While the original change tries to fix a bug, it also unintentionally broke existing systems, see the regressions reported at: https://lore.kernel.org/all/3a1b9909-45ac-4f97-ad68-d16ef1ce99db@xxxxxxxxxxxxxxx/ Since d794734c9bbf was also marked for -stable, let's back it out before causing more damage. Note that due to another upstream change the revert was not 100% automatic: 0a845e0f6348 mm/treewide: replace pud_large() with pud_leaf() Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx> Cc: <stable@xxxxxxxxxxxxxxx> Cc: Russ Anderson <rja@xxxxxxx> Cc: Steve Wahl <steve.wahl@xxxxxxx> Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx> Link: https://lore.kernel.org/all/3a1b9909-45ac-4f97-ad68-d16ef1ce99db@xxxxxxxxxxxxxxx/ Fixes: d794734c9bbf ("x86/mm/ident_map: Use gbpages only where full GB page should be mapped.") --- arch/x86/mm/ident_map.c | 23 +++++------------------ 1 file changed, 5 insertions(+), 18 deletions(-) diff --git a/arch/x86/mm/ident_map.c b/arch/x86/mm/ident_map.c index a204a33..968d700 100644 --- a/arch/x86/mm/ident_map.c +++ b/arch/x86/mm/ident_map.c @@ -26,31 +26,18 @@ static int ident_pud_init(struct x86_mapping_info *info, pud_t *pud_page, for (; addr < end; addr = next) { pud_t *pud = pud_page + pud_index(addr); pmd_t *pmd; - bool use_gbpage; next = (addr & PUD_MASK) + PUD_SIZE; if (next > end) next = end; - /* if this is already a gbpage, this portion is already mapped */ - if (pud_leaf(*pud)) - continue; - - /* Is using a gbpage allowed? */ - use_gbpage = info->direct_gbpages; - - /* Don't use gbpage if it maps more than the requested region. */ - /* at the begining: */ - use_gbpage &= ((addr & ~PUD_MASK) == 0); - /* ... or at the end: */ - use_gbpage &= ((next & ~PUD_MASK) == 0); - - /* Never overwrite existing mappings */ - use_gbpage &= !pud_present(*pud); - - if (use_gbpage) { + if (info->direct_gbpages) { pud_t pudval; + if (pud_present(*pud)) + continue; + + addr &= PUD_MASK; pudval = __pud((addr - info->offset) | info->page_flag); set_pud(pud, pudval); continue;
