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x86/mm/pat: don't collapse pages without PSE set

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Collapsing pages to a leaf PMD or PUD should be done only if
X86_FEATURE_PSE is available, which is not the case when running e.g.
as a Xen PV guest.

Fixes: 41d88484c7 ("x86/mm/pat: restore large ROX pages after fragmentation")
Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20250528123557.12847-3-jgross@suse.com
This commit is contained in:
Juergen Gross 2025-06-03 14:14:41 +03:00 committed by Peter Zijlstra
parent 0b3bc018e8
commit 1dbf30fdb5
1 changed files with 3 additions and 0 deletions
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3
arch/x86/mm/pat/set_memory.c
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@ -1257,6 +1257,9 @@ static int collapse_pmd_page(pmd_t *pmd, unsigned long addr,
pgprot_t pgprot;
int i = 0;
if (!cpu_feature_enabled(X86_FEATURE_PSE))
return 0;
addr &= PMD_MASK;
pte = pte_offset_kernel(pmd, addr);
first = *pte;