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[209.85.220.73]) by mx.google.com with SMTPS id c8sor2309547uaf.58.2019.06.04.05.04.51 for (Google Transport Security); Tue, 04 Jun 2019 05:04:51 -0700 (PDT) Received-SPF: pass (google.com: domain of 3y172xaokcoyivlzmgsvdtowwotm.kwutqvcf-uusdiks.wzo@flex--andreyknvl.bounces.google.com designates 209.85.220.73 as permitted sender) client-ip=209.85.220.73; Authentication-Results: mx.google.com; dkim=pass header.i=@google.com header.s=20161025 header.b=GowLAStz; spf=pass (google.com: domain of 3y172xaokcoyivlzmgsvdtowwotm.kwutqvcf-uusdiks.wzo@flex--andreyknvl.bounces.google.com designates 209.85.220.73 as permitted sender) smtp.mailfrom=3Y172XAoKCOYIVLZMgSVdTOWWOTM.KWUTQVcf-UUSdIKS.WZO@flex--andreyknvl.bounces.google.com; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=google.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:message-id:mime-version:subject:from:to:cc; bh=jQ4jdowRSjR3urFOBjyFZklSNNoQ/ud0fhl6APbdVCA=; b=GowLAStz/2F1T2+1l2LwgSfjTKRmMNBrNNCBZBil5igL4JQyaWlnxhbbmWCoX861Oi B/gqgNlu7CEqXMP2+z7kELt1QAkywzQ/4/CBIgoztk4jhPS0IDaW6f2xT62bZyvCkGPW ChaaC18egrJWcY5tXKS1tu+1ggnllHfRVAt4dSrOhgYxZTnaC50stPSrxwS8K7gbAyLN UjDTA5LQ+N55Gnmek72ZITAekTqyE/lF715JE4SsnddL1vL3d3tMoF9CBM84jFEXZ+Fi /tVHki2lXZ2QdEK7Q+gvSqDXWwBEJ/eJ981jOBPiAFjG2vVRecZEHKzlptA4WkyhnZzl 0RUQ== X-Google-Smtp-Source: APXvYqzbAGU8OQBoy9uHFFBvYRcfDQrSEKOseigLTkDo7YUO7FMQDDHLZj47ajW7+eNrCdw8uM2m21YgNxpjq+Kq X-Received: by 2002:ab0:184e:: with SMTP id j14mr15665222uag.91.1559649891290; Tue, 04 Jun 2019 05:04:51 -0700 (PDT) Date: Tue, 4 Jun 2019 14:04:47 +0200 Message-Id: Mime-Version: 1.0 X-Mailer: git-send-email 2.22.0.rc1.311.g5d7573a151-goog Subject: [PATCH v2] uaccess: add noop untagged_addr definition From: Andrey Konovalov To: Linus Torvalds , linux-arm-kernel@lists.infradead.org, sparclinux@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: Catalin Marinas , Vincenzo Frascino , Will Deacon , Mark Rutland , Andrew Morton , Greg Kroah-Hartman , Kees Cook , Yishai Hadas , Felix Kuehling , Alexander Deucher , Christian Koenig , Mauro Carvalho Chehab , Jens Wiklander , Alex Williamson , Leon Romanovsky , Luc Van Oostenryck , Dave Martin , Khalid Aziz , enh , Jason Gunthorpe , Christoph Hellwig , Dmitry Vyukov , Kostya Serebryany , Evgeniy Stepanov , Lee Smith , Ramana Radhakrishnan , Jacob Bramley , Ruben Ayrapetyan , Robin Murphy , Kevin Brodsky , Szabolcs Nagy , Andrey Konovalov X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: X-Virus-Scanned: ClamAV using ClamSMTP Architectures that support memory tagging have a need to perform untagging (stripping the tag) in various parts of the kernel. This patch adds an untagged_addr() macro, which is defined as noop for architectures that do not support memory tagging. The oncoming patch series will define it at least for sparc64 and arm64. Acked-by: Catalin Marinas Reviewed-by: Khalid Aziz Signed-off-by: Andrey Konovalov --- include/linux/mm.h | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/include/linux/mm.h b/include/linux/mm.h index 0e8834ac32b7..dd0b5f4e1e45 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -99,6 +99,17 @@ extern int mmap_rnd_compat_bits __read_mostly; #include #include +/* + * Architectures that support memory tagging (assigning tags to memory regions, + * embedding these tags into addresses that point to these memory regions, and + * checking that the memory and the pointer tags match on memory accesses) + * redefine this macro to strip tags from pointers. + * It's defined as noop for arcitectures that don't support memory tagging. + */ +#ifndef untagged_addr +#define untagged_addr(addr) (addr) +#endif + #ifndef __pa_symbol #define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x), 0)) #endif