linux-kernel - [PATCH 1/3] sparc32: mm: Don't try to free page-table pages if ctor() fails

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Message-Id: <20200526173302.377-2-will@kernel.org>
Date:   Tue, 26 May 2020 18:33:00 +0100
From:   Will Deacon <will@...nel.org>
To:     linux-kernel@...r.kernel.org
Cc:     sparclinux@...r.kernel.org, Will Deacon <will@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        "David S . Miller" <davem@...emloft.net>,
        Guenter Roeck <linux@...ck-us.net>,
        Mike Rapoport <rppt@...nel.org>, kernel-team@...roid.com,
        "Kirill A . Shutemov" <kirill@...temov.name>
Subject: [PATCH 1/3] sparc32: mm: Don't try to free page-table pages if ctor() fails

The pages backing page-table allocations for SRMMU are allocated via
memblock as part of the "nocache" region initialisation during
srmmu_paging_init() and should not be freed even if a later call to
pgtable_pte_page_ctor() fails.

Remove the broken call to __free_page().

Cc: David S. Miller <davem@...emloft.net>
Cc: Kirill A. Shutemov <kirill@...temov.name>
Fixes: 1ae9ae5f7df7 ("sparc: handle pgtable_page_ctor() fail")
Signed-off-by: Will Deacon <will@...nel.org>
---
 arch/sparc/mm/srmmu.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/arch/sparc/mm/srmmu.c b/arch/sparc/mm/srmmu.c
index c861c0f0df73..589370a21b12 100644
--- a/arch/sparc/mm/srmmu.c
+++ b/arch/sparc/mm/srmmu.c
@@ -365,7 +365,6 @@ pgtable_t pte_alloc_one(struct mm_struct *mm)
 		return NULL;
 	page = pfn_to_page(__nocache_pa((unsigned long)ptep) >> PAGE_SHIFT);
 	if (!pgtable_pte_page_ctor(page)) {
-		__free_page(page);
 		return NULL;
 	}
 	return ptep;
-- 
2.27.0.rc0.183.gde8f92d652-goog