From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4F3A3C43461 for ; Tue, 20 Apr 2021 13:17:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1FB3F613D2 for ; Tue, 20 Apr 2021 13:17:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232449AbhDTNRr (ORCPT ); Tue, 20 Apr 2021 09:17:47 -0400 Received: from mail.kernel.org ([198.145.29.99]:33760 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232443AbhDTNRp (ORCPT ); Tue, 20 Apr 2021 09:17:45 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id CE057613CA; Tue, 20 Apr 2021 13:17:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1618924634; bh=I/WWp3ZhiKpLexAP/6uikhopmlNfpvxqz9r1ZOciMHE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=UjXkKne+FA6PkCeeaRcCEbX6RLKVRuOZ950ZCFbmq7MKlDrFMoTQh9mnZRkPy2aGx /gLjaLVwUrA1Rp2N6jWx+BpEIWTFmBe1vqlBsoiPGg0GkiVz5tLIB0gsurVKD4pkaw 7gXvNEn04SUiRgGDfrhEgpO4bnMBzvJNM0M7y6t+/VENHx8C/E9ulvt5AmJqWDUUQn zKcjUrgm6zeqJrE/wb8pbdExYJ3d26l9AX4v5MOq3N/1HlIm+936DGGRA0IZdnoFfM VLSUXFbe7czTs8sXSG+NXGS+jKF3NMjIzssHmIppiVUWTlLNzvGw0BLAO7qZijhlnW CdBL8LeCbxZ3w== From: Mike Rapoport To: Andrew Morton Cc: Alexander Viro , Andy Lutomirski , Arnd Bergmann , Borislav Petkov , Catalin Marinas , Christopher Lameter , Dan Williams , Dave Hansen , David Hildenbrand , Elena Reshetova , "H. Peter Anvin" , Ingo Molnar , James Bottomley , "Kirill A. Shutemov" , Matthew Wilcox , Matthew Garrett , Mark Rutland , Michal Hocko , Mike Rapoport , Mike Rapoport , Michael Kerrisk , Palmer Dabbelt , Paul Walmsley , Peter Zijlstra , "Rafael J. Wysocki" , Rick Edgecombe , Roman Gushchin , Shakeel Butt , Shuah Khan , Thomas Gleixner , Tycho Andersen , Will Deacon , Yury Norov , linux-api@vger.kernel.org, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-nvdimm@lists.01.org, linux-riscv@lists.infradead.org, x86@kernel.org, kernel test robot Subject: [PATCH v2 2/2] secretmem: optimize page_is_secretmem() Date: Tue, 20 Apr 2021 16:16:11 +0300 Message-Id: <20210420131611.8259-5-rppt@kernel.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20210420131611.8259-1-rppt@kernel.org> References: <20210420131611.8259-1-rppt@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-api@vger.kernel.org From: Mike Rapoport Kernel test robot reported -4.2% regression of will-it-scale.per_thread_ops due to commit "mm: introduce memfd_secret system call to create "secret" memory areas". The perf profile of the test indicated that the regression is caused by page_is_secretmem() called from gup_pte_range() (inlined by gup_pgd_range): 27.76 +2.5 30.23 perf-profile.children.cycles-pp.gup_pgd_range 0.00 +3.2 3.19 ± 2% perf-profile.children.cycles-pp.page_mapping 0.00 +3.7 3.66 ± 2% perf-profile.children.cycles-pp.page_is_secretmem Further analysis showed that the slow down happens because neither page_is_secretmem() nor page_mapping() are not inline and moreover, multiple page flags checks in page_mapping() involve calling compound_head() several times for the same page. Make page_is_secretmem() inline and replace page_mapping() with page flag checks that do not imply page-to-head conversion. Reported-by: kernel test robot Signed-off-by: Mike Rapoport --- include/linux/secretmem.h | 26 +++++++++++++++++++++++++- mm/secretmem.c | 12 +----------- 2 files changed, 26 insertions(+), 12 deletions(-) diff --git a/include/linux/secretmem.h b/include/linux/secretmem.h index 907a6734059c..b842b38cbeb1 100644 --- a/include/linux/secretmem.h +++ b/include/linux/secretmem.h @@ -4,8 +4,32 @@ #ifdef CONFIG_SECRETMEM +extern const struct address_space_operations secretmem_aops; + +static inline bool page_is_secretmem(struct page *page) +{ + struct address_space *mapping; + + /* + * Using page_mapping() is quite slow because of the actual call + * instruction and repeated compound_head(page) inside the + * page_mapping() function. + * We know that secretmem pages are not compound and LRU so we can + * save a couple of cycles here. + */ + if (PageCompound(page) || !PageLRU(page)) + return false; + + mapping = (struct address_space *) + ((unsigned long)page->mapping & ~PAGE_MAPPING_FLAGS); + + if (mapping != page->mapping) + return false; + + return page->mapping->a_ops == &secretmem_aops; +} + bool vma_is_secretmem(struct vm_area_struct *vma); -bool page_is_secretmem(struct page *page); bool secretmem_active(void); #else diff --git a/mm/secretmem.c b/mm/secretmem.c index 3b1ba3991964..0bcd15e1b549 100644 --- a/mm/secretmem.c +++ b/mm/secretmem.c @@ -151,22 +151,12 @@ static void secretmem_freepage(struct page *page) clear_highpage(page); } -static const struct address_space_operations secretmem_aops = { +const struct address_space_operations secretmem_aops = { .freepage = secretmem_freepage, .migratepage = secretmem_migratepage, .isolate_page = secretmem_isolate_page, }; -bool page_is_secretmem(struct page *page) -{ - struct address_space *mapping = page_mapping(page); - - if (!mapping) - return false; - - return mapping->a_ops == &secretmem_aops; -} - static struct vfsmount *secretmem_mnt; static struct file *secretmem_file_create(unsigned long flags) -- 2.28.0 From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 70AFCC43460 for ; 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Tue, 20 Apr 2021 06:17:14 -0700 (PDT) Received: by mail.kernel.org (Postfix) with ESMTPSA id CE057613CA; Tue, 20 Apr 2021 13:17:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1618924634; bh=I/WWp3ZhiKpLexAP/6uikhopmlNfpvxqz9r1ZOciMHE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=UjXkKne+FA6PkCeeaRcCEbX6RLKVRuOZ950ZCFbmq7MKlDrFMoTQh9mnZRkPy2aGx /gLjaLVwUrA1Rp2N6jWx+BpEIWTFmBe1vqlBsoiPGg0GkiVz5tLIB0gsurVKD4pkaw 7gXvNEn04SUiRgGDfrhEgpO4bnMBzvJNM0M7y6t+/VENHx8C/E9ulvt5AmJqWDUUQn zKcjUrgm6zeqJrE/wb8pbdExYJ3d26l9AX4v5MOq3N/1HlIm+936DGGRA0IZdnoFfM VLSUXFbe7czTs8sXSG+NXGS+jKF3NMjIzssHmIppiVUWTlLNzvGw0BLAO7qZijhlnW CdBL8LeCbxZ3w== From: Mike Rapoport To: Andrew Morton Subject: [PATCH v2 2/2] secretmem: optimize page_is_secretmem() Date: Tue, 20 Apr 2021 16:16:11 +0300 Message-Id: <20210420131611.8259-5-rppt@kernel.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20210420131611.8259-1-rppt@kernel.org> References: <20210420131611.8259-1-rppt@kernel.org> MIME-Version: 1.0 Message-ID-Hash: WBC4DMLBI2FVF5ZEAGD55G2PTVAY2KDO X-Message-ID-Hash: WBC4DMLBI2FVF5ZEAGD55G2PTVAY2KDO X-MailFrom: rppt@kernel.org X-Mailman-Rule-Hits: nonmember-moderation X-Mailman-Rule-Misses: dmarc-mitigation; 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ESMTPSA id CE057613CA; Tue, 20 Apr 2021 13:17:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1618924634; bh=I/WWp3ZhiKpLexAP/6uikhopmlNfpvxqz9r1ZOciMHE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=UjXkKne+FA6PkCeeaRcCEbX6RLKVRuOZ950ZCFbmq7MKlDrFMoTQh9mnZRkPy2aGx /gLjaLVwUrA1Rp2N6jWx+BpEIWTFmBe1vqlBsoiPGg0GkiVz5tLIB0gsurVKD4pkaw 7gXvNEn04SUiRgGDfrhEgpO4bnMBzvJNM0M7y6t+/VENHx8C/E9ulvt5AmJqWDUUQn zKcjUrgm6zeqJrE/wb8pbdExYJ3d26l9AX4v5MOq3N/1HlIm+936DGGRA0IZdnoFfM VLSUXFbe7czTs8sXSG+NXGS+jKF3NMjIzssHmIppiVUWTlLNzvGw0BLAO7qZijhlnW CdBL8LeCbxZ3w== From: Mike Rapoport To: Andrew Morton Cc: Alexander Viro , Andy Lutomirski , Arnd Bergmann , Borislav Petkov , Catalin Marinas , Christopher Lameter , Dan Williams , Dave Hansen , David Hildenbrand , Elena Reshetova , "H. Peter Anvin" , Ingo Molnar , James Bottomley , "Kirill A. Shutemov" , Matthew Wilcox , Matthew Garrett , Mark Rutland , Michal Hocko , Mike Rapoport , Mike Rapoport , Michael Kerrisk , Palmer Dabbelt , Paul Walmsley , Peter Zijlstra , "Rafael J. Wysocki" , Rick Edgecombe , Roman Gushchin , Shakeel Butt , Shuah Khan , Thomas Gleixner , Tycho Andersen , Will Deacon , Yury Norov , linux-api@vger.kernel.org, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-nvdimm@lists.01.org, linux-riscv@lists.infradead.org, x86@kernel.org, kernel test robot Subject: [PATCH v2 2/2] secretmem: optimize page_is_secretmem() Date: Tue, 20 Apr 2021 16:16:11 +0300 Message-Id: <20210420131611.8259-5-rppt@kernel.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20210420131611.8259-1-rppt@kernel.org> References: <20210420131611.8259-1-rppt@kernel.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210420_061714_829026_81536AEA X-CRM114-Status: GOOD ( 17.45 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list 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DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1618924634; bh=I/WWp3ZhiKpLexAP/6uikhopmlNfpvxqz9r1ZOciMHE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=UjXkKne+FA6PkCeeaRcCEbX6RLKVRuOZ950ZCFbmq7MKlDrFMoTQh9mnZRkPy2aGx /gLjaLVwUrA1Rp2N6jWx+BpEIWTFmBe1vqlBsoiPGg0GkiVz5tLIB0gsurVKD4pkaw 7gXvNEn04SUiRgGDfrhEgpO4bnMBzvJNM0M7y6t+/VENHx8C/E9ulvt5AmJqWDUUQn zKcjUrgm6zeqJrE/wb8pbdExYJ3d26l9AX4v5MOq3N/1HlIm+936DGGRA0IZdnoFfM VLSUXFbe7czTs8sXSG+NXGS+jKF3NMjIzssHmIppiVUWTlLNzvGw0BLAO7qZijhlnW CdBL8LeCbxZ3w== From: Mike Rapoport To: Andrew Morton Cc: Alexander Viro , Andy Lutomirski , Arnd Bergmann , Borislav Petkov , Catalin Marinas , Christopher Lameter , Dan Williams , Dave Hansen , David Hildenbrand , Elena Reshetova , "H. Peter Anvin" , Ingo Molnar , James Bottomley , "Kirill A. Shutemov" , Matthew Wilcox , Matthew Garrett , Mark Rutland , Michal Hocko , Mike Rapoport , Mike Rapoport , Michael Kerrisk , Palmer Dabbelt , Paul Walmsley , Peter Zijlstra , "Rafael J. Wysocki" , Rick Edgecombe , Roman Gushchin , Shakeel Butt , Shuah Khan , Thomas Gleixner , Tycho Andersen , Will Deacon , Yury Norov , linux-api@vger.kernel.org, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-nvdimm@lists.01.org, linux-riscv@lists.infradead.org, x86@kernel.org, kernel test robot Subject: [PATCH v2 2/2] secretmem: optimize page_is_secretmem() Date: Tue, 20 Apr 2021 16:16:11 +0300 Message-Id: <20210420131611.8259-5-rppt@kernel.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20210420131611.8259-1-rppt@kernel.org> References: <20210420131611.8259-1-rppt@kernel.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210420_061714_829026_81536AEA X-CRM114-Status: GOOD ( 17.45 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org RnJvbTogTWlrZSBSYXBvcG9ydCA8cnBwdEBsaW51eC5pYm0uY29tPgoKS2VybmVsIHRlc3Qgcm9i b3QgcmVwb3J0ZWQgLTQuMiUgcmVncmVzc2lvbiBvZiB3aWxsLWl0LXNjYWxlLnBlcl90aHJlYWRf b3BzCmR1ZSB0byBjb21taXQgIm1tOiBpbnRyb2R1Y2UgbWVtZmRfc2VjcmV0IHN5c3RlbSBjYWxs IHRvIGNyZWF0ZSAic2VjcmV0IgptZW1vcnkgYXJlYXMiLgoKVGhlIHBlcmYgcHJvZmlsZSBvZiB0 aGUgdGVzdCBpbmRpY2F0ZWQgdGhhdCB0aGUgcmVncmVzc2lvbiBpcyBjYXVzZWQgYnkKcGFnZV9p c19zZWNyZXRtZW0oKSBjYWxsZWQgZnJvbSBndXBfcHRlX3JhbmdlKCkgKGlubGluZWQgYnkgZ3Vw X3BnZF9yYW5nZSk6CgogMjcuNzYgICsyLjUgIDMwLjIzICAgICAgIHBlcmYtcHJvZmlsZS5jaGls ZHJlbi5jeWNsZXMtcHAuZ3VwX3BnZF9yYW5nZQogIDAuMDAgICszLjIgICAzLjE5IMKxIDIlICBw ZXJmLXByb2ZpbGUuY2hpbGRyZW4uY3ljbGVzLXBwLnBhZ2VfbWFwcGluZwogIDAuMDAgICszLjcg ICAzLjY2IMKxIDIlICBwZXJmLXByb2ZpbGUuY2hpbGRyZW4uY3ljbGVzLXBwLnBhZ2VfaXNfc2Vj cmV0bWVtCgpGdXJ0aGVyIGFuYWx5c2lzIHNob3dlZCB0aGF0IHRoZSBzbG93IGRvd24gaGFwcGVu cyBiZWNhdXNlIG5laXRoZXIKcGFnZV9pc19zZWNyZXRtZW0oKSBub3IgcGFnZV9tYXBwaW5nKCkg YXJlIG5vdCBpbmxpbmUgYW5kIG1vcmVvdmVyLAptdWx0aXBsZSBwYWdlIGZsYWdzIGNoZWNrcyBp biBwYWdlX21hcHBpbmcoKSBpbnZvbHZlIGNhbGxpbmcKY29tcG91bmRfaGVhZCgpIHNldmVyYWwg dGltZXMgZm9yIHRoZSBzYW1lIHBhZ2UuCgpNYWtlIHBhZ2VfaXNfc2VjcmV0bWVtKCkgaW5saW5l IGFuZCByZXBsYWNlIHBhZ2VfbWFwcGluZygpIHdpdGggcGFnZSBmbGFnCmNoZWNrcyB0aGF0IGRv IG5vdCBpbXBseSBwYWdlLXRvLWhlYWQgY29udmVyc2lvbi4KClJlcG9ydGVkLWJ5OiBrZXJuZWwg dGVzdCByb2JvdCA8b2xpdmVyLnNhbmdAaW50ZWwuY29tPgpTaWduZWQtb2ZmLWJ5OiBNaWtlIFJh cG9wb3J0IDxycHB0QGxpbnV4LmlibS5jb20+Ci0tLQogaW5jbHVkZS9saW51eC9zZWNyZXRtZW0u aCB8IDI2ICsrKysrKysrKysrKysrKysrKysrKysrKystCiBtbS9zZWNyZXRtZW0uYyAgICAgICAg ICAgIHwgMTIgKy0tLS0tLS0tLS0tCiAyIGZpbGVzIGNoYW5nZWQsIDI2IGluc2VydGlvbnMoKyks IDEyIGRlbGV0aW9ucygtKQoKZGlmZiAtLWdpdCBhL2luY2x1ZGUvbGludXgvc2VjcmV0bWVtLmgg Yi9pbmNsdWRlL2xpbnV4L3NlY3JldG1lbS5oCmluZGV4IDkwN2E2NzM0MDU5Yy4uYjg0MmIzOGNi ZWIxIDEwMDY0NAotLS0gYS9pbmNsdWRlL2xpbnV4L3NlY3JldG1lbS5oCisrKyBiL2luY2x1ZGUv bGludXgvc2VjcmV0bWVtLmgKQEAgLTQsOCArNCwzMiBAQAogCiAjaWZkZWYgQ09ORklHX1NFQ1JF VE1FTQogCitleHRlcm4gY29uc3Qgc3RydWN0IGFkZHJlc3Nfc3BhY2Vfb3BlcmF0aW9ucyBzZWNy ZXRtZW1fYW9wczsKKworc3RhdGljIGlubGluZSBib29sIHBhZ2VfaXNfc2VjcmV0bWVtKHN0cnVj dCBwYWdlICpwYWdlKQoreworCXN0cnVjdCBhZGRyZXNzX3NwYWNlICptYXBwaW5nOworCisJLyoK KwkgKiBVc2luZyBwYWdlX21hcHBpbmcoKSBpcyBxdWl0ZSBzbG93IGJlY2F1c2Ugb2YgdGhlIGFj dHVhbCBjYWxsCisJICogaW5zdHJ1Y3Rpb24gYW5kIHJlcGVhdGVkIGNvbXBvdW5kX2hlYWQocGFn ZSkgaW5zaWRlIHRoZQorCSAqIHBhZ2VfbWFwcGluZygpIGZ1bmN0aW9uLgorCSAqIFdlIGtub3cg dGhhdCBzZWNyZXRtZW0gcGFnZXMgYXJlIG5vdCBjb21wb3VuZCBhbmQgTFJVIHNvIHdlIGNhbgor CSAqIHNhdmUgYSBjb3VwbGUgb2YgY3ljbGVzIGhlcmUuCisJICovCisJaWYgKFBhZ2VDb21wb3Vu ZChwYWdlKSB8fCAhUGFnZUxSVShwYWdlKSkKKwkJcmV0dXJuIGZhbHNlOworCisJbWFwcGluZyA9 IChzdHJ1Y3QgYWRkcmVzc19zcGFjZSAqKQorCQkoKHVuc2lnbmVkIGxvbmcpcGFnZS0+bWFwcGlu ZyAmIH5QQUdFX01BUFBJTkdfRkxBR1MpOworCisJaWYgKG1hcHBpbmcgIT0gcGFnZS0+bWFwcGlu ZykKKwkJcmV0dXJuIGZhbHNlOworCisJcmV0dXJuIHBhZ2UtPm1hcHBpbmctPmFfb3BzID09ICZz ZWNyZXRtZW1fYW9wczsKK30KKwogYm9vbCB2bWFfaXNfc2VjcmV0bWVtKHN0cnVjdCB2bV9hcmVh X3N0cnVjdCAqdm1hKTsKLWJvb2wgcGFnZV9pc19zZWNyZXRtZW0oc3RydWN0IHBhZ2UgKnBhZ2Up OwogYm9vbCBzZWNyZXRtZW1fYWN0aXZlKHZvaWQpOwogCiAjZWxzZQpkaWZmIC0tZ2l0IGEvbW0v c2VjcmV0bWVtLmMgYi9tbS9zZWNyZXRtZW0uYwppbmRleCAzYjFiYTM5OTE5NjQuLjBiY2QxNWUx YjU0OSAxMDA2NDQKLS0tIGEvbW0vc2VjcmV0bWVtLmMKKysrIGIvbW0vc2VjcmV0bWVtLmMKQEAg LTE1MSwyMiArMTUxLDEyIEBAIHN0YXRpYyB2b2lkIHNlY3JldG1lbV9mcmVlcGFnZShzdHJ1Y3Qg cGFnZSAqcGFnZSkKIAljbGVhcl9oaWdocGFnZShwYWdlKTsKIH0KIAotc3RhdGljIGNvbnN0IHN0 cnVjdCBhZGRyZXNzX3NwYWNlX29wZXJhdGlvbnMgc2VjcmV0bWVtX2FvcHMgPSB7Citjb25zdCBz dHJ1Y3QgYWRkcmVzc19zcGFjZV9vcGVyYXRpb25zIHNlY3JldG1lbV9hb3BzID0gewogCS5mcmVl cGFnZQk9IHNlY3JldG1lbV9mcmVlcGFnZSwKIAkubWlncmF0ZXBhZ2UJPSBzZWNyZXRtZW1fbWln cmF0ZXBhZ2UsCiAJLmlzb2xhdGVfcGFnZQk9IHNlY3JldG1lbV9pc29sYXRlX3BhZ2UsCiB9Owog Ci1ib29sIHBhZ2VfaXNfc2VjcmV0bWVtKHN0cnVjdCBwYWdlICpwYWdlKQotewotCXN0cnVjdCBh ZGRyZXNzX3NwYWNlICptYXBwaW5nID0gcGFnZV9tYXBwaW5nKHBhZ2UpOwotCi0JaWYgKCFtYXBw aW5nKQotCQlyZXR1cm4gZmFsc2U7Ci0KLQlyZXR1cm4gbWFwcGluZy0+YV9vcHMgPT0gJnNlY3Jl dG1lbV9hb3BzOwotfQotCiBzdGF0aWMgc3RydWN0IHZmc21vdW50ICpzZWNyZXRtZW1fbW50Owog CiBzdGF0aWMgc3RydWN0IGZpbGUgKnNlY3JldG1lbV9maWxlX2NyZWF0ZSh1bnNpZ25lZCBsb25n IGZsYWdzKQotLSAKMi4yOC4wCgoKX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX18KbGludXgtYXJtLWtlcm5lbCBtYWlsaW5nIGxpc3QKbGludXgtYXJtLWtlcm5l bEBsaXN0cy5pbmZyYWRlYWQub3JnCmh0dHA6Ly9saXN0cy5pbmZyYWRlYWQub3JnL21haWxtYW4v bGlzdGluZm8vbGludXgtYXJtLWtlcm5lbAo=