From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from e28smtp01.in.ibm.com ([122.248.162.1]) by bombadil.infradead.org with esmtps (Exim 4.69 #1 (Red Hat Linux)) id 1NDHkv-00053H-Iv for kexec@lists.infradead.org; Wed, 25 Nov 2009 13:18:06 +0000 Received: from d28relay05.in.ibm.com (d28relay05.in.ibm.com [9.184.220.62]) by e28smtp01.in.ibm.com (8.14.3/8.13.1) with ESMTP id nAPDHuJR022749 for ; Wed, 25 Nov 2009 18:47:56 +0530 Received: from d28av01.in.ibm.com (d28av01.in.ibm.com [9.184.220.63]) by d28relay05.in.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id nAPDHuVM3567792 for ; Wed, 25 Nov 2009 18:47:56 +0530 Received: from d28av01.in.ibm.com (loopback [127.0.0.1]) by d28av01.in.ibm.com (8.14.3/8.13.1/NCO v10.0 AVout) with ESMTP id nAPDHtHX006069 for ; Wed, 25 Nov 2009 18:47:56 +0530 Date: Wed, 25 Nov 2009 18:47:47 +0530 From: "M. Mohan Kumar" Subject: [PATCH] Reserve memory for kdump kernel within RMO region Message-ID: <20091125131747.GA28857@in.ibm.com> MIME-Version: 1.0 Content-Disposition: inline Reply-To: mohan@in.ibm.com List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: kexec-bounces@lists.infradead.org Errors-To: kexec-bounces+dwmw2=infradead.org@lists.infradead.org To: benh@kernel.crashing.org, ppcdev Cc: michael@ellerman.id.au, kexec@lists.infradead.org Reserve memory for kdump kernel within RMO region When the kernel size exceeds 32MB(observed with some distros), memory for kdump kernel can not be reserved as kdump kernel base is assumed to be 32MB always. When the kernel has CONFIG_RELOCATABLE option enabled, provide the feature to reserve the memory for kdump kernel anywhere in the RMO region. Signed-off-by: M. Mohan Kumar --- arch/powerpc/kernel/machine_kexec.c | 19 +++++++++++++++++++ 1 files changed, 19 insertions(+), 0 deletions(-) diff --git a/arch/powerpc/kernel/machine_kexec.c b/arch/powerpc/kernel/machine_kexec.c index baf1af0..99b2f9f 100644 --- a/arch/powerpc/kernel/machine_kexec.c +++ b/arch/powerpc/kernel/machine_kexec.c @@ -140,10 +140,29 @@ void __init reserve_crashkernel(void) /* The crash region must not overlap the current kernel */ if (overlaps_crashkernel(__pa(_stext), _end - _stext)) { +#ifdef CONFIG_RELOCATABLE + do { + /* Align kdump kernel to 16MB (size of large page) */ + crashk_res.start = ALIGN(crashk_res.start + + (16 * 1024 * 1024), 0x1000000); + if (crashk_res.start + (_stext - _end) > lmb.rmo_size) { + printk(KERN_WARNING + "Not enough memory for crash kernel\n"); + crashk_res.start = crashk_res.end = 0; + return; + } + } while (overlaps_crashkernel(__pa(_stext), _end - _stext)); + + crashk_res.end = crashk_res.start + crash_size - 1; + printk(KERN_INFO + "crash kernel memory overlaps with kernel memory\n" + "Moving it to %lx\n", (unsigned long)crashk_res.start); +#else printk(KERN_WARNING "Crash kernel can not overlap current kernel\n"); crashk_res.start = crashk_res.end = 0; return; +#endif } /* Crash kernel trumps memory limit */ -- 1.5.4 _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec