Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
IronPort-SDR: uWHD7F5t2HzlTcto9mPtvJcDEq9sES5hTS581oUnaruuGCDkBRGkG43VurwDmUL8y3VJxymj3J
 1XinxyK2Ceyw==
IronPort-SDR: lGuaSt9Jbppuno2GL+IX51ChFHPEI5DU+6ronyLCHnvyol9GOMLKa/g0sci/4syDwSpPwbuOAE
 o2DRvdX+WXuw==
From:   "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
To:     Dave Hansen <dave.hansen@linux.intel.com>,
        Andy Lutomirski <luto@kernel.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Sean Christopherson <seanjc@google.com>,
        Jim Mattson <jmattson@google.com>
Cc:     David Rientjes <rientjes@google.com>,
        "Edgecombe, Rick P" <rick.p.edgecombe@intel.com>,
        "Kleen, Andi" <andi.kleen@intel.com>,
        "Yamahata, Isaku" <isaku.yamahata@intel.com>,
        Erdem Aktas <erdemaktas@google.com>,
        Steve Rutherford <srutherford@google.com>,
        Peter Gonda <pgonda@google.com>,
        David Hildenbrand <david@redhat.com>, x86@kernel.org,
        kvm@vger.kernel.org, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org,
        "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Subject: [RFCv2 07/13] mm: Add hwpoison_entry_to_pfn() and hwpoison_entry_to_page()
Date:   Fri, 16 Apr 2021 18:41:00 +0300
Message-Id: <20210416154106.23721-8-kirill.shutemov@linux.intel.com>
In-Reply-To: <20210416154106.23721-1-kirill.shutemov@linux.intel.com>
References: <20210416154106.23721-1-kirill.shutemov@linux.intel.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

Add helpers to convert hwpoison swap entry to pfn and page.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
 include/linux/swapops.h | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/include/linux/swapops.h b/include/linux/swapops.h
index d9b7c9132c2f..520589b12fb3 100644
--- a/include/linux/swapops.h
+++ b/include/linux/swapops.h
@@ -323,6 +323,16 @@ static inline int is_hwpoison_entry(swp_entry_t entry)
 	return swp_type(entry) == SWP_HWPOISON;
 }
 
+static inline unsigned long hwpoison_entry_to_pfn(swp_entry_t entry)
+{
+	return swp_offset(entry);
+}
+
+static inline struct page *hwpoison_entry_to_page(swp_entry_t entry)
+{
+	return pfn_to_page(hwpoison_entry_to_pfn(entry));
+}
+
 static inline void num_poisoned_pages_inc(void)
 {
 	atomic_long_inc(&num_poisoned_pages);
@@ -345,6 +355,16 @@ static inline int is_hwpoison_entry(swp_entry_t swp)
 	return 0;
 }
 
+static inline unsigned long hwpoison_entry_to_pfn(swp_entry_t entry)
+{
+	return 0;
+}
+
+static inline struct page *hwpoison_entry_to_page(swp_entry_t entry)
+{
+	return NULL;
+}
+
 static inline void num_poisoned_pages_inc(void)
 {
 }
-- 
2.26.3