From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AIpwx4/dk43yFLwMLjyHZjlKyhPxscA+G5bSfW5IVxyX6RDRGIRi1uDOIdMFcUlNgVMDFJbXzIE5 ARC-Seal: i=1; a=rsa-sha256; t=1523977663; cv=none; d=google.com; s=arc-20160816; b=1Cab7yNRJslmKjMSsR+iAafzVnpu3yqHbmfUWTgFsH9uq+qhX74SPgO0uhxlXf4HJ1 n08DhTf6Wj/HGfEQJwU9FPyQNoOvPG2ZPR+WrIqiA8y+euY86X2zKObForxDHsYptRjc AJ7f4TJr/9iRkpCdAfjCwYWZ3RDexZArPtWCpMCQgwEeIrUJFylkz2nx5y1UjRD+d+bs 4gpPN+0GlYpY9MGH/pJIc8C5/g+xuoaHABVrqqxe7rUu9GVuIyQ5dTWhPjkyDpirY7D7 vVRiXMuDtj14Dc/u8lRDPNO77vXPRQKt1Bl8OoyZdnX04Fhj0aHnuO+hoRZf0vHo2nzZ B3IA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=content-language:content-transfer-encoding:in-reply-to:mime-version :user-agent:date:message-id:autocrypt:openpgp:from:references:cc:to :subject:dkim-signature:arc-authentication-results; bh=rbWeRn5qSDAA8iQ16Cuz/8jJqbspWX0TycjBEtRr9dQ=; b=Zg/H1RgyXTdDk0SeWTWH9Xiot7YsESOUkbY6bwHA2VXpORDOkwawpC3DBzqPZ+CefP TPCC5E9+FbYqrC7gVr9SLDdJGrISjVHvr403Vpi6dDL0czltMUy95lwzC3AyvY1JfEKb FEz8iQcw2lraFyrvujhITP3a7SOQPsCcrffOAESAAS9H7vqHU0+YTYkCd6dOl7ggQZLO G+ThuorVxX4PA07cLMHjQYubBn3ypkI9d/pYOdMTLPmNolEZvIPIDgJq4w6cmo3LCE+z TXzVbshhhvaM0AbuzLdRqfleX3gTe2k+HQeBC8IV8h3jqRGhFcdjVLOjG/1cr2EWVxBI urKA== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@oracle.com header.s=corp-2017-10-26 header.b=J/q0Abz2; spf=pass (google.com: domain of boris.ostrovsky@oracle.com designates 156.151.31.85 as permitted sender) smtp.mailfrom=boris.ostrovsky@oracle.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=oracle.com Authentication-Results: mx.google.com; dkim=pass header.i=@oracle.com header.s=corp-2017-10-26 header.b=J/q0Abz2; spf=pass (google.com: domain of boris.ostrovsky@oracle.com designates 156.151.31.85 as permitted sender) smtp.mailfrom=boris.ostrovsky@oracle.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=oracle.com Subject: Re: [PATCH 1/4] xen: xen-pciback: Replace GFP_ATOMIC with GFP_KERNEL in pcistub_probe To: Jia-Ju Bai , jgross@suse.com, gregkh@linuxfoundation.org Cc: xen-devel@lists.xenproject.org, linux-kernel@vger.kernel.org References: <1523286216-26345-1-git-send-email-baijiaju1990@gmail.com> From: Boris Ostrovsky Openpgp: preference=signencrypt Autocrypt: addr=boris.ostrovsky@oracle.com; 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Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0 MIME-Version: 1.0 In-Reply-To: <1523286216-26345-1-git-send-email-baijiaju1990@gmail.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Content-Language: en-US X-Proofpoint-Virus-Version: vendor=nai engine=5900 definitions=8865 signatures=668698 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=897 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1711220000 definitions=main-1804170135 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: =?utf-8?q?1597281379484745930?= X-GMAIL-MSGID: =?utf-8?q?1598006402047866320?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: On 04/09/2018 11:03 AM, Jia-Ju Bai wrote: > pcistub_probe() is never called in atomic context. > This function is only set as ".probe" in struct pci_driver. > > Despite never getting called from atomic context, > pcistub_probe() calls kmalloc() with GFP_ATOMIC, > which does not sleep for allocation. > GFP_ATOMIC is not necessary and can be replaced with GFP_KERNEL, > which can sleep and improve the possibility of sucessful allocation. > > This is found by a static analysis tool named DCNS written by myself. > And I also manually check it. > > Signed-off-by: Jia-Ju Bai > Applied the series and the extra patch to for-linus-4.17 -boris