diff mbox series

[v11,2/6] x86: Support Generic Initiator only proximity domains

Message ID 20200928125235.446188-3-Jonathan.Cameron@huawei.com
State Accepted
Commit 73bf7382debb1a93fef5ff38222c6a3b62dfea44
Headers show
Series ACPI: Support Generic Initiator proximity domains | expand

Commit Message

Jonathan Cameron Sept. 28, 2020, 12:52 p.m. UTC
In common with memoryless domains we only register GI domains
if the proximity node is not online. If a domain is already
a memory containing domain, or a memoryless domain there is
nothing to do just because it also contains a Generic Initiator.

Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
---
v11: Improved description for init_gi_nodes()

 arch/x86/include/asm/numa.h |  2 ++
 arch/x86/kernel/setup.c     |  1 +
 arch/x86/mm/numa.c          | 21 +++++++++++++++++++++
 3 files changed, 24 insertions(+)

Comments

Borislav Petkov Sept. 28, 2020, 5:35 p.m. UTC | #1
On Mon, Sep 28, 2020 at 08:52:31PM +0800, Jonathan Cameron wrote:
> In common with memoryless domains we only register GI domains
				   ^^^^

> if the proximity node is not online. If a domain is already
> a memory containing domain, or a memoryless domain there is
> nothing to do just because it also contains a Generic Initiator.

...

> +/*
> + * A node may exist which has one or more Generic Initiators but no CPUs and no
> + * memory.
> + *
> + * This function must be called after init_cpu_to_node() to ensure that we have
									  ^^^

You love that "we". :)

Pls use passive voice in your commit message: no "we" or "I", etc, and
describe your changes in imperative mood.

Also, pls read section "2) Describe your changes" in
Documentation/process/submitting-patches.rst for more details.

Bottom line is: personal pronouns are ambiguous in text, especially with
so many parties/companies/etc developing the kernel so let's avoid them
please.

Thx.
diff mbox series

Patch

diff --git a/arch/x86/include/asm/numa.h b/arch/x86/include/asm/numa.h
index bbfde3d2662f..f631467272a3 100644
--- a/arch/x86/include/asm/numa.h
+++ b/arch/x86/include/asm/numa.h
@@ -62,12 +62,14 @@  extern void numa_clear_node(int cpu);
 extern void __init init_cpu_to_node(void);
 extern void numa_add_cpu(int cpu);
 extern void numa_remove_cpu(int cpu);
+extern void init_gi_nodes(void);
 #else	/* CONFIG_NUMA */
 static inline void numa_set_node(int cpu, int node)	{ }
 static inline void numa_clear_node(int cpu)		{ }
 static inline void init_cpu_to_node(void)		{ }
 static inline void numa_add_cpu(int cpu)		{ }
 static inline void numa_remove_cpu(int cpu)		{ }
+static inline void init_gi_nodes(void)			{ }
 #endif	/* CONFIG_NUMA */
 
 #ifdef CONFIG_DEBUG_PER_CPU_MAPS
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index 3511736fbc74..9062c146f03a 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -1218,6 +1218,7 @@  void __init setup_arch(char **cmdline_p)
 	prefill_possible_map();
 
 	init_cpu_to_node();
+	init_gi_nodes();
 
 	io_apic_init_mappings();
 
diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c
index aa76ec2d359b..cab6f679941d 100644
--- a/arch/x86/mm/numa.c
+++ b/arch/x86/mm/numa.c
@@ -747,6 +747,27 @@  static void __init init_memory_less_node(int nid)
 	 */
 }
 
+/*
+ * A node may exist which has one or more Generic Initiators but no CPUs and no
+ * memory.
+ *
+ * This function must be called after init_cpu_to_node() to ensure that we have
+ * already brought online any memoryless CPU nodes, and before the node_data[nid]
+ * needs to be available for zone list setup in build_all_zonelists().
+ *
+ * When this function is called, any nodes containing either memory and/or CPUs
+ * will already be online and there is no need to do anything extra, even if
+ * they also contain one or more Generic Initiators.
+ */
+void __init init_gi_nodes(void)
+{
+	int nid;
+
+	for_each_node_state(nid, N_GENERIC_INITIATOR)
+		if (!node_online(nid))
+			init_memory_less_node(nid);
+}
+
 /*
  * Setup early cpu_to_node.
  *