From: Yinghai Lu <yinghai@kernel.org>
To: Suresh Siddha <suresh.b.siddha@intel.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
"ananth@in.ibm.com" <ananth@in.ibm.com>,
Ingo Molnar <mingo@elte.hu>, Thomas Gleixner <tglx@linutronix.de>,
"H. Peter Anvin" <hpa@zytor.com>,
Andrew Morton <akpm@linux-foundation.org>
Cc: linux-kernel@vger.kernel.org, Yinghai Lu <yinghai@kernel.org>
Subject:
Date: Mon, 11 Jan 2010 18:45:57 -0800 [thread overview]
Message-ID: <1263264358-3896-3-git-send-email-yinghai@kernel.org> (raw)
In-Reply-To: <1263264358-3896-1-git-send-email-yinghai@kernel.org>
should use nr_cpu_ids instead of num_processor, in case we have hotplug cpus.
if current only have 8 cpus is up, but if we will have more cpus that
will be hot added later, we should use physical flat at first.
nr_cpu_ids is the total cpus that could be supported.
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
---
arch/x86/kernel/apic/probe_32.c | 20 ++++++++++++++++++--
arch/x86/kernel/apic/probe_64.c | 3 ++-
arch/x86/kernel/smpboot.c | 2 --
3 files changed, 20 insertions(+), 5 deletions(-)
Index: linux-2.6/arch/x86/kernel/apic/probe_32.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/apic/probe_32.c
+++ linux-2.6/arch/x86/kernel/apic/probe_32.c
@@ -52,7 +52,7 @@ static int __init print_ipi_mode(void)
}
late_initcall(print_ipi_mode);
-void default_setup_apic_routing(void)
+static void local_default_setup_apic_routing(void)
{
#ifdef CONFIG_X86_IO_APIC
printk(KERN_INFO
@@ -103,7 +103,7 @@ struct apic apic_default = {
.init_apic_ldr = default_init_apic_ldr,
.ioapic_phys_id_map = default_ioapic_phys_id_map,
- .setup_apic_routing = default_setup_apic_routing,
+ .setup_apic_routing = local_default_setup_apic_routing,
.multi_timer_check = NULL,
.apicid_to_node = default_apicid_to_node,
.cpu_to_logical_apicid = default_cpu_to_logical_apicid,
@@ -207,6 +207,22 @@ void __init generic_bigsmp_probe(void)
apic = &apic_bigsmp;
printk(KERN_INFO "Overriding APIC driver with %s\n",
apic->name);
+ }
+ }
+#endif
+}
+
+void default_setup_apic_routing(void)
+{
+#ifdef CONFIG_X86_BIGSMP
+ /*
+ * make sure we go to bigsmp according to real nr_cpu_ids
+ */
+ if (!cmdline_apic && apic == &apic_default) {
+ if (nr_cpu_ids > 8) {
+ apic = &apic_bigsmp;
+ printk(KERN_INFO "Overriding APIC driver with %s\n",
+ apic->name);
}
}
#endif
Index: linux-2.6/arch/x86/kernel/smpboot.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/smpboot.c
+++ linux-2.6/arch/x86/kernel/smpboot.c
@@ -1084,9 +1084,7 @@ void __init native_smp_prepare_cpus(unsi
set_cpu_sibling_map(0);
enable_IR_x2apic();
-#ifdef CONFIG_X86_64
default_setup_apic_routing();
-#endif
if (smp_sanity_check(max_cpus) < 0) {
printk(KERN_INFO "SMP disabled\n");
Index: linux-2.6/arch/x86/kernel/apic/probe_64.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/apic/probe_64.c
+++ linux-2.6/arch/x86/kernel/apic/probe_64.c
@@ -67,7 +67,8 @@ void __init default_setup_apic_routing(v
}
#endif
- if (apic == &apic_flat && num_processors > 8)
+ /* not just num_processors, we could have hotplug cpus */
+ if (apic == &apic_flat && nr_cpu_ids > 8)
apic = &apic_physflat;
printk(KERN_INFO "Setting APIC routing to %s\n", apic->name);
next prev parent reply other threads:[~2010-01-12 2:47 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-12 2:45 Yinghai Lu
2010-01-12 2:45 ` Yinghai Lu
2010-01-12 2:45 ` Yinghai Lu [this message]
2010-01-12 2:45 ` Yinghai Lu
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1263264358-3896-3-git-send-email-yinghai@kernel.org \
--to=yinghai@kernel.org \
--cc=akpm@linux-foundation.org \
--cc=ananth@in.ibm.com \
--cc=hpa@zytor.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@elte.hu \
--cc=suresh.b.siddha@intel.com \
--cc=tglx@linutronix.de \
--cc=torvalds@linux-foundation.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).