x86/mm: Disable hugetlb page table sharing on 32-bit

Only select ARCH_WANT_HUGE_PMD_SHARE on 64-bit x86.
Page table sharing requires at least three levels because it involves
shared references to PMD tables; 32-bit x86 has either two-level paging
(without PAE) or three-level paging (with PAE), but even with
three-level paging, having a dedicated PGD entry for hugetlb is only
barely possible (because the PGD only has four entries), and it seems
unlikely anyone's actually using PMD sharing on 32-bit.

Having ARCH_WANT_HUGE_PMD_SHARE enabled on non-PAE 32-bit X86 (which
has 2-level paging) became particularly problematic after commit
59d9094df3d7 ("mm: hugetlb: independent PMD page table shared count"),
since that changes `struct ptdesc` such that the `pt_mm` (for PGDs) and
the `pt_share_count` (for PMDs) share the same union storage - and with
2-level paging, PMDs are PGDs.

(For comparison, arm64 also gates ARCH_WANT_HUGE_PMD_SHARE on the
configuration of page tables such that it is never enabled with 2-level
paging.)

Closes: https://lore.kernel.org/r/srhpjxlqfna67blvma5frmy3aa@altlinux.org
Fixes: cfe28c5d63d8 ("x86: mm: Remove x86 version of huge_pmd_share.")
Reported-by: Vitaly Chikunov <vt@altlinux.org>
Suggested-by: Dave Hansen <dave.hansen@intel.com>
Signed-off-by: Jann Horn <jannh@google.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Acked-by: Oscar Salvador <osalvador@suse.de>
Acked-by: David Hildenbrand <david@redhat.com>
Tested-by: Vitaly Chikunov <vt@altlinux.org>
Cc:stable@vger.kernel.org
Link: https://lore.kernel.org/all/20250702-x86-2level-hugetlb-v2-1-1a98096edf92%40google.com

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 71019b3b54ea71e08d25349ec0612ae329ce0345..4e0fe688cc83849e3fd775c10e233baf69f83b3f 100644 (file)
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -147,7 +147,7 @@ config X86
        select ARCH_WANTS_DYNAMIC_TASK_STRUCT
        select ARCH_WANTS_NO_INSTR
        select ARCH_WANT_GENERAL_HUGETLB
-       select ARCH_WANT_HUGE_PMD_SHARE
+       select ARCH_WANT_HUGE_PMD_SHARE         if X86_64
        select ARCH_WANT_LD_ORPHAN_WARN
        select ARCH_WANT_OPTIMIZE_DAX_VMEMMAP   if X86_64
        select ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP       if X86_64