diff mbox series

[RFT,v2,02/23] x86/boot: Disregard __supported_pte_mask in __startup_64()

Message ID 20250504095230.2932860-27-ardb+git@google.com
State New
Headers show
Series [tip:,x86/boot] x86/boot: Disregard __supported_pte_mask in __startup_64() | expand

Commit Message

Ard Biesheuvel May 4, 2025, 9:52 a.m. UTC 
From: Ard Biesheuvel <ardb@kernel.org>

__supported_pte_mask is statically initialized to U64_MAX and never
assigned until long after the startup code executes that creates the
initial page tables. So applying the mask is unnecessary, and can be
avoided.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
---
 arch/x86/boot/startup/map_kernel.c | 2 --
 1 file changed, 2 deletions(-)
diff mbox series

Patch

diff --git a/arch/x86/boot/startup/map_kernel.c b/arch/x86/boot/startup/map_kernel.c
index 0eac3f17dbd3..099ae2559336 100644
--- a/arch/x86/boot/startup/map_kernel.c
+++ b/arch/x86/boot/startup/map_kernel.c
@@ -179,8 +179,6 @@  unsigned long __head __startup_64(unsigned long p2v_offset,
 	pud[(i + 1) % PTRS_PER_PUD] = (pudval_t)pmd + pgtable_flags;
 
 	pmd_entry = __PAGE_KERNEL_LARGE_EXEC & ~_PAGE_GLOBAL;
-	/* Filter out unsupported __PAGE_KERNEL_* bits: */
-	pmd_entry &= __supported_pte_mask;
 	pmd_entry += sme_get_me_mask();
 	pmd_entry +=  physaddr;