From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AH8x224zbyrFxM5mxG6t0U7en+Gq5OKjj4cGEK8j2IIFD6ObtWLsB5rxOBd8Kvait2VxVDXOj8dx ARC-Seal: i=1; a=rsa-sha256; t=1517591788; cv=none; d=google.com; s=arc-20160816; b=fY5ywE1XtPjGnGvOxh0znyb7/bCcdoWfhbsZTKSo6hmYzq/c8zTw8j3pg92JU6dbTN tRoIMHiUFKEXva/yLlCRMqjYuwY4jJltKzMas8XJ9AkRGXs8TmD3KWJ0j3YbFqpOUs0T MQdGRO4YQ94qoHnljLS5n+YDEUCJMq1kQbBg1NPBs1lka8jyetXv5qAfV8XrlU61uoJI WbgYl8aJBiAX6Mwhn9dhBj7QrewXLIfZXCG0uc6HaNaAsnSiG5qMfrvqOQf4avcVUZA6 ZP44W47KdSr60j6LR+5aLX+R8lnkdAG7bgG96+jwNiS91VzPl58OFENzu+7n+Ke6PL7m Rn2A== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=mime-version:user-agent:references:in-reply-to:message-id:date :subject:cc:to:from:arc-authentication-results; bh=LMcwJhA+HyD/kZu65vKN/fReVgi5kAN3tmkGtScGjSM=; b=EZCmF+Y0B83dM6QwY1IOkmowipJ/H5SmJjejDzUAPFeRdnxezeQsbMWnb8ggaAT1DT kEHhzq9FJkxTij99HlERYAL83UVpKR5dauAoTT0UXIH0o6JCTGWkLM1BilxuH5NwPM2d Q2AT/BX3Ir9ISlFkTsJnb8FvBj0Co12ufnsdT+PABGZ5STReSjZPa6/15+FDqZhthz6O Mg9yHpQ7sgLydvakWmYbdYm19ZOzCUIazVzBsJlTbSALS8X/4JPFve27n1tdS+Jb/l/w 0WvHXQCBO9n08NISAGnQiTYGtzAQ4NJ0gW1pK/ZIc4Hqaky6XBeNIusJ+8ZoFCZ1hGfR bF/A== ARC-Authentication-Results: i=1; mx.google.com; spf=softfail (google.com: domain of transitioning gregkh@linuxfoundation.org does not designate 90.92.71.90 as permitted sender) smtp.mailfrom=gregkh@linuxfoundation.org Authentication-Results: mx.google.com; spf=softfail (google.com: domain of transitioning gregkh@linuxfoundation.org does not designate 90.92.71.90 as permitted sender) smtp.mailfrom=gregkh@linuxfoundation.org From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Ganesh Mahendran , Martijn Coenen , Todd Kjos Subject: [PATCH 4.15 43/55] android: binder: use VM_ALLOC to get vm area Date: Fri, 2 Feb 2018 17:59:01 +0100 Message-Id: <20180202140830.313699045@linuxfoundation.org> X-Mailer: git-send-email 2.16.1 In-Reply-To: <20180202140826.117602411@linuxfoundation.org> References: <20180202140826.117602411@linuxfoundation.org> User-Agent: quilt/0.65 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-LABELS: =?utf-8?b?IlxcU2VudCI=?= X-GMAIL-THRID: =?utf-8?q?1591310157854405524?= X-GMAIL-MSGID: =?utf-8?q?1591310326840910577?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: 4.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Ganesh Mahendran commit aac6830ec1cb681544212838911cdc57f2638216 upstream. VM_IOREMAP is used to access hardware through a mechanism called I/O mapped memory. Android binder is a IPC machanism which will not access I/O memory. And VM_IOREMAP has alignment requiement which may not needed in binder. __get_vm_area_node() { ... if (flags & VM_IOREMAP) align = 1ul << clamp_t(int, fls_long(size), PAGE_SHIFT, IOREMAP_MAX_ORDER); ... } This patch will save some kernel vm area, especially for 32bit os. In 32bit OS, kernel vm area is only 240MB. We may got below error when launching a app: <3>[ 4482.440053] binder_alloc: binder_alloc_mmap_handler: 15728 8ce67000-8cf65000 get_vm_area failed -12 <3>[ 4483.218817] binder_alloc: binder_alloc_mmap_handler: 15745 8ce67000-8cf65000 get_vm_area failed -12 Signed-off-by: Ganesh Mahendran Acked-by: Martijn Coenen Acked-by: Todd Kjos Signed-off-by: Greg Kroah-Hartman --- drivers/android/binder_alloc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/android/binder_alloc.c +++ b/drivers/android/binder_alloc.c @@ -666,7 +666,7 @@ int binder_alloc_mmap_handler(struct bin goto err_already_mapped; } - area = get_vm_area(vma->vm_end - vma->vm_start, VM_IOREMAP); + area = get_vm_area(vma->vm_end - vma->vm_start, VM_ALLOC); if (area == NULL) { ret = -ENOMEM; failure_string = "get_vm_area";