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Tue, 15 Mar 2022 14:19:05 +0000 (UTC) Received: from t480s.redhat.com (unknown [10.39.194.72]) by smtp.corp.redhat.com (Postfix) with ESMTP id 23B234087D7E; Tue, 15 Mar 2022 14:18:58 +0000 (UTC) From: David Hildenbrand To: linux-kernel@vger.kernel.org Subject: [PATCH v1 2/7] mm/debug_vm_pgtable: add tests for __HAVE_ARCH_PTE_SWP_EXCLUSIVE Date: Tue, 15 Mar 2022 15:18:32 +0100 Message-Id: <20220315141837.137118-3-david@redhat.com> In-Reply-To: <20220315141837.137118-1-david@redhat.com> References: <20220315141837.137118-1-david@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 2.84 on 10.11.54.1 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: x86@kernel.org, Jan Kara , David Hildenbrand , Catalin Marinas , Yang Shi , Dave Hansen , Peter Xu , Michal Hocko , linux-mm@kvack.org, Donald Dutile , Liang Zhang , Borislav Petkov , Alexander Gordeev , Will Deacon , Christoph Hellwig , Paul Mackerras , Andrea Arcangeli , linux-s390@vger.kernel.org, Vasily Gorbik , Rik van Riel , Hugh Dickins , Matthew Wilcox , Mike Rapoport , Ingo Molnar , linux-arm-kernel@lists.infradead.org, Jason Gunthorpe , David Rientjes , Pedro Gomes , Jann Horn , John Hubbard , Heiko Carstens , Shakeel Butt , Thomas Gleixner , Vlastimil Babka , Oded Gabbay , linuxppc-dev@lists.ozlabs.org, Oleg Nesterov , Nadav Amit , Andrew Morton , Linus Torvalds , Roman Gushchin , "Kirill A . Shutemov" , Mike Kravetz Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" Let's test that __HAVE_ARCH_PTE_SWP_EXCLUSIVE works as expected. Signed-off-by: David Hildenbrand --- mm/debug_vm_pgtable.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/mm/debug_vm_pgtable.c b/mm/debug_vm_pgtable.c index db2abd9e415b..55f1a8dc716f 100644 --- a/mm/debug_vm_pgtable.c +++ b/mm/debug_vm_pgtable.c @@ -837,6 +837,19 @@ static void __init pmd_soft_dirty_tests(struct pgtable_debug_args *args) { } static void __init pmd_swap_soft_dirty_tests(struct pgtable_debug_args *args) { } #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ +static void __init pte_swap_exclusive_tests(struct pgtable_debug_args *args) +{ +#ifdef __HAVE_ARCH_PTE_SWP_EXCLUSIVE + pte_t pte = pfn_pte(args->fixed_pte_pfn, args->page_prot); + + pr_debug("Validating PTE swap exclusive\n"); + pte = pte_swp_mkexclusive(pte); + WARN_ON(!pte_swp_exclusive(pte)); + pte = pte_swp_clear_exclusive(pte); + WARN_ON(pte_swp_exclusive(pte)); +#endif /* __HAVE_ARCH_PTE_SWP_EXCLUSIVE */ +} + static void __init pte_swap_tests(struct pgtable_debug_args *args) { swp_entry_t swp; @@ -1288,6 +1301,8 @@ static int __init debug_vm_pgtable(void) pte_swap_soft_dirty_tests(&args); pmd_swap_soft_dirty_tests(&args); + pte_swap_exclusive_tests(&args); + pte_swap_tests(&args); pmd_swap_tests(&args); -- 2.35.1