linux-kernel - [PATCH AUTOSEL 6.12 086/486] s390/tlb: Use mm_has_pgste() instead of mm_alloc

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Message-Id: <20250505223922.2682012-86-sashal@kernel.org>
Date: Mon,  5 May 2025 18:32:42 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Heiko Carstens <hca@...ux.ibm.com>,
	Alexander Gordeev <agordeev@...ux.ibm.com>,
	Vasily Gorbik <gor@...ux.ibm.com>,
	Sasha Levin <sashal@...nel.org>,
	will@...nel.org,
	aneesh.kumar@...nel.org,
	npiggin@...il.com,
	peterz@...radead.org,
	linux-arch@...r.kernel.org,
	linux-mm@...ck.org,
	linux-s390@...r.kernel.org
Subject: [PATCH AUTOSEL 6.12 086/486] s390/tlb: Use mm_has_pgste() instead of mm_alloc_pgste()

From: Heiko Carstens <hca@...ux.ibm.com>

[ Upstream commit 9291ea091b29bb3e37c4b3416c7c1e49e472c7d5 ]

An mm has pgstes only after s390_enable_sie() has been called, while
mm_alloc_pgste() may be always true (e.g. via sysctl setting).

Limit the calls to gmap_unlink() in pte_free_tlb() to those cases
where there might be something to unlink.

Reviewed-by: Alexander Gordeev <agordeev@...ux.ibm.com>
Signed-off-by: Heiko Carstens <hca@...ux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@...ux.ibm.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/s390/include/asm/tlb.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/s390/include/asm/tlb.h b/arch/s390/include/asm/tlb.h
index e95b2c8081eb8..793afe236df07 100644
--- a/arch/s390/include/asm/tlb.h
+++ b/arch/s390/include/asm/tlb.h
@@ -85,7 +85,7 @@ static inline void pte_free_tlb(struct mmu_gather *tlb, pgtable_t pte,
 	tlb->mm->context.flush_mm = 1;
 	tlb->freed_tables = 1;
 	tlb->cleared_pmds = 1;
-	if (mm_alloc_pgste(tlb->mm))
+	if (mm_has_pgste(tlb->mm))
 		gmap_unlink(tlb->mm, (unsigned long *)pte, address);
 	tlb_remove_ptdesc(tlb, pte);
 }
-- 
2.39.5