linux-kernel - [tip: x86/mm] x86/pat: Restructure _lookup_address

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Date: Sun, 14 Apr 2024 20:31:00 -0000
From: "tip-bot2 for Juergen Gross" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Juergen Gross <jgross@...e.com>, Ingo Molnar <mingo@...nel.org>,
 x86@...nel.org, linux-kernel@...r.kernel.org
Subject: [tip: x86/mm] x86/pat: Restructure _lookup_address_cpa()

The following commit has been merged into the x86/mm branch of tip:

Commit-ID:     02eac06b820c3eae73e5736ae62f986d37fed991
Gitweb:        https://git.kernel.org/tip/02eac06b820c3eae73e5736ae62f986d37fed991
Author:        Juergen Gross <jgross@...e.com>
AuthorDate:    Fri, 12 Apr 2024 17:12:57 +02:00
Committer:     Ingo Molnar <mingo@...nel.org>
CommitterDate: Sun, 14 Apr 2024 22:16:28 +02:00

x86/pat: Restructure _lookup_address_cpa()

Modify _lookup_address_cpa() to no longer use lookup_address(), but
only lookup_address_in_pgd().

This is done in preparation of using lookup_address_in_pgd_attr().

No functional change intended.

Signed-off-by: Juergen Gross <jgross@...e.com>
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Link: https://lore.kernel.org/r/20240412151258.9171-4-jgross@suse.com
---
 arch/x86/mm/pat/set_memory.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/arch/x86/mm/pat/set_memory.c b/arch/x86/mm/pat/set_memory.c
index bfa0aae..4ebccaf 100644
--- a/arch/x86/mm/pat/set_memory.c
+++ b/arch/x86/mm/pat/set_memory.c
@@ -744,11 +744,14 @@ EXPORT_SYMBOL_GPL(lookup_address);
 static pte_t *_lookup_address_cpa(struct cpa_data *cpa, unsigned long address,
 				  unsigned int *level)
 {
-	if (cpa->pgd)
-		return lookup_address_in_pgd(cpa->pgd + pgd_index(address),
-					       address, level);
+	pgd_t *pgd;
+
+	if (!cpa->pgd)
+		pgd = pgd_offset_k(address);
+	else
+		pgd = cpa->pgd + pgd_index(address);
 
-	return lookup_address(address, level);
+	return lookup_address_in_pgd(pgd, address, level);
 }
 
 /*