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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Thu, 31 Jan 2019 06:41:45 -0000 Received: from b06wcsmtp001.portsmouth.uk.ibm.com (b06wcsmtp001.portsmouth.uk.ibm.com [9.149.105.160]) by b06cxnps3074.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x0V6filb25034870 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Thu, 31 Jan 2019 06:41:44 GMT Received: from b06wcsmtp001.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 9DDB0A4054; Thu, 31 Jan 2019 06:41:44 +0000 (GMT) Received: from b06wcsmtp001.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 6E948A405C; Thu, 31 Jan 2019 06:41:41 +0000 (GMT) Received: from rapoport-lnx (unknown [9.148.8.84]) by b06wcsmtp001.portsmouth.uk.ibm.com (Postfix) with ESMTPS; Thu, 31 Jan 2019 06:41:41 +0000 (GMT) Date: Thu, 31 Jan 2019 08:41:39 +0200 From: Mike Rapoport To: Christophe Leroy Subject: Re: [PATCH v2 19/21] treewide: add checks for the return value of memblock_alloc*() References: <1548057848-15136-1-git-send-email-rppt@linux.ibm.com> <1548057848-15136-20-git-send-email-rppt@linux.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: User-Agent: Mutt/1.5.24 (2015-08-30) X-TM-AS-GCONF: 00 x-cbid: 19013106-0028-0000-0000-00000341269A X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19013106-0029-0000-0000-000023FF2799 Message-Id: <20190131064139.GB28876@rapoport-lnx> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2019-01-31_03:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1901310052 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Rich Felker , linux-ia64@vger.kernel.org, Petr Mladek , linux-sh@vger.kernel.org, Catalin Marinas , Heiko Carstens , linux-kernel@vger.kernel.org, Max Filippov , Guo Ren , sparclinux@vger.kernel.org, Christoph Hellwig , linux-s390@vger.kernel.org, linux-c6x-dev@linux-c6x.org, Yoshinori Sato , Richard Weinberger , x86@kernel.org, Russell King , kasan-dev@googlegroups.com, Geert Uytterhoeven , Mark Salter , Dennis Zhou , Matt Turner , linux-snps-arc@lists.infradead.org, uclinux-h8-devel@lists.sourceforge.jp, devicetree@vger.kernel.org, Stephen Rothwell , linux-xtensa@linux-xtensa.org, linux-um@lists.infradead.org, linux-m68k@lists.linux-m68k.org, Rob Herring , Greentime Hu , xen-devel@lists.xenproject.org, Stafford Horne , Guan Xuetao , linux-arm-kernel@lists.infradead.org, Michal Simek , Tony Luck , linux-mm@kvack.org, Greg Kroah-Hartman , linux-usb@vger.kernel.org, linux-mips@vger.kernel.org, Paul Burton , Vineet Gupta , linux-alpha@vger.kernel.org, Andrew Morton , linuxppc-dev@lists.ozlabs.org, "David S. Miller" , openrisc@lists.librecores.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Thu, Jan 31, 2019 at 07:07:46AM +0100, Christophe Leroy wrote: > > > Le 21/01/2019 à 09:04, Mike Rapoport a écrit : > >Add check for the return value of memblock_alloc*() functions and call > >panic() in case of error. > >The panic message repeats the one used by panicing memblock allocators with > >adjustment of parameters to include only relevant ones. > > > >The replacement was mostly automated with semantic patches like the one > >below with manual massaging of format strings. > > > >@@ > >expression ptr, size, align; > >@@ > >ptr = memblock_alloc(size, align); > >+ if (!ptr) > >+ panic("%s: Failed to allocate %lu bytes align=0x%lx\n", __func__, > >size, align); > > > >Signed-off-by: Mike Rapoport > >Reviewed-by: Guo Ren # c-sky > >Acked-by: Paul Burton # MIPS > >Acked-by: Heiko Carstens # s390 > >Reviewed-by: Juergen Gross # Xen > >--- > > [...] > > >diff --git a/mm/sparse.c b/mm/sparse.c > >index 7ea5dc6..ad94242 100644 > >--- a/mm/sparse.c > >+++ b/mm/sparse.c > > [...] > > >@@ -425,6 +436,10 @@ static void __init sparse_buffer_init(unsigned long size, int nid) > > memblock_alloc_try_nid_raw(size, PAGE_SIZE, > > __pa(MAX_DMA_ADDRESS), > > MEMBLOCK_ALLOC_ACCESSIBLE, nid); > >+ if (!sparsemap_buf) > >+ panic("%s: Failed to allocate %lu bytes align=0x%lx nid=%d from=%lx\n", > >+ __func__, size, PAGE_SIZE, nid, __pa(MAX_DMA_ADDRESS)); > >+ > > memblock_alloc_try_nid_raw() does not panic (help explicitly says: Does not > zero allocated memory, does not panic if request cannot be satisfied.). "Does not panic" does not mean it always succeeds. > Stephen Rothwell reports a boot failure due to this change. Please see my reply on that thread. > Christophe > > > sparsemap_buf_end = sparsemap_buf + size; > > } > > > -- Sincerely yours, Mike.