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Tue, 06 Oct 2026 07:04:17 -0700 (PDT) From: Matt Turner Date: Tue, 06 Oct 2026 10:04:13 -0400 Subject: [PATCH 1/6] alpha: add missing page_table_check_pte_clear() to ptep_get_and_clear() Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20261006-alpha-hugepages-v1-1-a673a18aaa70@gmail.com> References: <20261006-alpha-hugepages-v1-0-a673a18aaa70@gmail.com> In-Reply-To: <20261006-alpha-hugepages-v1-0-a673a18aaa70@gmail.com> To: Richard Henderson , Magnus Lindholm Cc: linux-alpha@vger.kernel.org, linux-kernel@vger.kernel.org, Matt Turner X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=openpgp-sha256; l=1295; i=mattst88@gmail.com; h=from:subject:message-id; bh=MZykUui1Wig1GtAKfx2ri2KqKibPxVefrQgVM77LKsQ=; b=owGbwMvMwCW25rVmCc8sv+mMp9WSGLKO/L+7Uz6ryELzRe4hhyqX4NZvOzwutptsL/+56afBV V2jueUKHR9ZGMS4GGaKKbLErVdkmdW2Y6nPaelfMHNYmUCGSIs0MAABCwNfbmJeqZGOkZ6ptqGe IZChYxQPkdNj0MgsLi5NLdJNKyhyyMsvSSzJzM8r1ssvSM0rSC/QS8tMK8nIyC8qTgUaoZeXWmL q6uhmZGhgYuloYeZk4Whq4uzsZOjk5ujo7OpkZGluYuBs6WjiamnOwMUpAHPNyuMMv1l/WIrVTr q9LDTJaYG/lm2c+dkTKd8eNN5szXV/r/ZKrY/hf4q8UdC29ewVh9f4vJ3f+21KyJG0/oiFEpHOW fKOqcmrGQA= X-Developer-Key: i=mattst88@gmail.com; a=openpgp; fpr=3BB639E56F861FA2E86505690FDD682D974CA72A Alpha's CONFIG_COMPACTION-gated ptep_get_and_clear() overrides the generic version in include/linux/pgtable.h but omits its page_table_check_pte_clear() call. With CONFIG_PAGE_TABLE_CHECK=y the map count taken by set_ptes() is therefore never dropped when a PTE is cleared through this path. Add the missing call, and drop the now-duplicate one in ptep_clear_flush(), which already goes through ptep_get_and_clear(). Signed-off-by: Matt Turner --- arch/alpha/include/asm/pgtable.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/alpha/include/asm/pgtable.h b/arch/alpha/include/asm/pgtable.h index 6ebdd90f3035..8a175e0c2b42 100644 --- a/arch/alpha/include/asm/pgtable.h +++ b/arch/alpha/include/asm/pgtable.h @@ -305,6 +305,7 @@ static inline pte_t ptep_get_and_clear(struct mm_struct *mm, pte_t pte = READ_ONCE(*ptep); pte_clear(mm, address, ptep); + page_table_check_pte_clear(mm, address, pte); return pte; } @@ -316,7 +317,6 @@ static inline pte_t ptep_clear_flush(struct vm_area_struct *vma, struct mm_struct *mm = vma->vm_mm; pte_t pte = ptep_get_and_clear(mm, addr, ptep); - page_table_check_pte_clear(mm, addr, pte); migrate_flush_tlb_page(vma, addr); return pte; } -- 2.54.0