linux-kernel - [RFT PATCH v3 14/21] x86/boot: Provide PIC aliases for 5-level paging related constants

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Message-ID: <20250512190834.332684-37-ardb+git@google.com>
Date: Mon, 12 May 2025 21:08:49 +0200
From: Ard Biesheuvel <ardb+git@...gle.com>
To: linux-kernel@...r.kernel.org
Cc: linux-efi@...r.kernel.org, x86@...nel.org, 
	Ard Biesheuvel <ardb@...nel.org>, Borislav Petkov <bp@...en8.de>, Ingo Molnar <mingo@...nel.org>, 
	Dionna Amalie Glaze <dionnaglaze@...gle.com>, Kevin Loughlin <kevinloughlin@...gle.com>, 
	Tom Lendacky <thomas.lendacky@....com>
Subject: [RFT PATCH v3 14/21] x86/boot: Provide PIC aliases for 5-level paging
 related constants

From: Ard Biesheuvel <ardb@...nel.org>

For the time being, provide PIC aliases for the global variables related
to 5-level paging. Some or all of these are in the process of being
removed, but currently, they are still assigned by the startup code.

Signed-off-by: Ard Biesheuvel <ardb@...nel.org>
---
 arch/x86/kernel/head64.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c
index 510fb41f55fc..8c69cea84297 100644
--- a/arch/x86/kernel/head64.c
+++ b/arch/x86/kernel/head64.c
@@ -53,10 +53,13 @@ pmdval_t early_pmd_flags = __PAGE_KERNEL_LARGE & ~(_PAGE_GLOBAL | _PAGE_NX);
 
 #ifdef CONFIG_X86_5LEVEL
 unsigned int __pgtable_l5_enabled __ro_after_init;
+SYM_PIC_ALIAS(__pgtable_l5_enabled);
 unsigned int pgdir_shift __ro_after_init = 39;
 EXPORT_SYMBOL(pgdir_shift);
+SYM_PIC_ALIAS(pgdir_shift);
 unsigned int ptrs_per_p4d __ro_after_init = 1;
 EXPORT_SYMBOL(ptrs_per_p4d);
+SYM_PIC_ALIAS(ptrs_per_p4d);
 #endif
 
 #ifdef CONFIG_DYNAMIC_MEMORY_LAYOUT
-- 
2.49.0.1045.g170613ef41-goog