From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from e23smtp02.au.ibm.com (e23smtp02.au.ibm.com [202.81.31.144]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client CN "e23smtp02.au.ibm.com", Issuer "GeoTrust SSL CA" (not verified)) by ozlabs.org (Postfix) with ESMTPS id 776AEB7046 for ; Mon, 18 Jun 2012 16:27:57 +1000 (EST) Received: from /spool/local by e23smtp02.au.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Mon, 18 Jun 2012 06:08:29 +1000 Received: from d23av04.au.ibm.com (d23av04.au.ibm.com [9.190.235.139]) by d23relay05.au.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id q5I6KD4G33489138 for ; Mon, 18 Jun 2012 16:20:14 +1000 Received: from d23av04.au.ibm.com (loopback [127.0.0.1]) by d23av04.au.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id q5I6Rk87029078 for ; Mon, 18 Jun 2012 16:27:47 +1000 Message-ID: <4FDECA4F.6030905@in.ibm.com> Date: Mon, 18 Jun 2012 11:57:27 +0530 From: "Suzuki K. Poulose" MIME-Version: 1.0 To: Simon Horman Subject: Re: [PATCH] [ppc] Do not reserve cpu spin-table for crash kernel References: <20120524060933.14035.42732.stgit@suzukikp.in.ibm.com> In-Reply-To: <20120524060933.14035.42732.stgit@suzukikp.in.ibm.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Cc: B29882@freescale.com, linuxppc-dev@lists.ozlabs.org, kexec@lists.infradead.org List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On 05/24/2012 11:39 AM, Suzuki K. Poulose wrote: > As of now, the kexec reserves the spin-table for all the CPUs > on an SMP machine. The spin-table is pointed to by the > cpu-release-addr property in the device-tree. Reserving the > spin-table in the crash kernel will cause a BUG(), if the table > lies outside the memory reserved for the crashkernel. > > Disable reserving the spin-table regions and use maxcpus=1 to > use only the crashing CPU to boot the crash kernel. > > Signed-off-by: Suzuki K. Poulose Simon, Any response on this one ? I have tested this on a Currituck board (476, SMP) with a UP kernel. Without this patch, the secondary kernel hits 'PANIC' in boot while trying to reserve a memory(the spin table), outside the memory range(crash reserve). Thanks Suzuki > --- > > kexec/arch/ppc/crashdump-powerpc.c | 19 +++++++++++++------ > kexec/arch/ppc/fixup_dtb.c | 4 ++++ > 2 files changed, 17 insertions(+), 6 deletions(-) > > diff --git a/kexec/arch/ppc/crashdump-powerpc.c b/kexec/arch/ppc/crashdump-powerpc.c > index 1bef69b..4c8c75d 100644 > --- a/kexec/arch/ppc/crashdump-powerpc.c > +++ b/kexec/arch/ppc/crashdump-powerpc.c > @@ -262,10 +262,19 @@ static void ulltoa(unsigned long long i, char *str) > } > } > > +/* Append str to cmdline */ > +static void add_cmdline(char *cmdline, char *str) > +{ > + int cmdlen = strlen(cmdline) + strlen(str); > + if (cmdlen> (COMMAND_LINE_SIZE - 1)) > + die("Command line overflow\n"); > + strcat(cmdline, str); > +} > + > static int add_cmdline_param(char *cmdline, unsigned long long addr, > char *cmdstr, char *byte) > { > - int cmdlen, len, align = 1024; > + int align = 1024; > char str[COMMAND_LINE_SIZE], *ptr; > > /* Passing in =xxxK / =xxxM format. Saves space required in cmdline.*/ > @@ -284,11 +293,8 @@ static int add_cmdline_param(char *cmdline, unsigned long long addr, > ptr += strlen(str); > ulltoa(addr, ptr); > strcat(str, byte); > - len = strlen(str); > - cmdlen = strlen(cmdline) + len; > - if (cmdlen> (COMMAND_LINE_SIZE - 1)) > - die("Command line overflow\n"); > - strcat(cmdline, str); > + > + add_cmdline(cmdline, str); > > dbgprintf("Command line after adding elfcorehdr: %s\n", cmdline); > > @@ -365,6 +371,7 @@ int load_crashdump_segments(struct kexec_info *info, char *mod_cmdline, > */ > add_cmdline_param(mod_cmdline, elfcorehdr, " elfcorehdr=", "K"); > add_cmdline_param(mod_cmdline, saved_max_mem, " savemaxmem=", "M"); > + add_cmdline(mod_cmdline, " maxcpus=1"); > return 0; > } > > diff --git a/kexec/arch/ppc/fixup_dtb.c b/kexec/arch/ppc/fixup_dtb.c > index e9890a4..f832026 100644 > --- a/kexec/arch/ppc/fixup_dtb.c > +++ b/kexec/arch/ppc/fixup_dtb.c > @@ -172,6 +172,9 @@ static void fixup_reserve_regions(struct kexec_info *info, char *blob_buf) > } > } > > +#if 0 > + /* XXX: Do not reserve spin-table for CPUs. */ > + > /* Add reserve regions for cpu-release-addr */ > nodeoffset = fdt_node_offset_by_prop_value(blob_buf, -1, "device_type", "cpu", 4); > while (nodeoffset != -FDT_ERR_NOTFOUND) { > @@ -201,6 +204,7 @@ static void fixup_reserve_regions(struct kexec_info *info, char *blob_buf) > nodeoffset = fdt_node_offset_by_prop_value(blob_buf, nodeoffset, > "device_type", "cpu", 4); > } > +#endif > > out: > print_fdt_reserve_regions(blob_buf); > > > _______________________________________________ > kexec mailing list > kexec@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/kexec >