Thread (9 messages) 9 messages, 2 authors, 2016-08-11

Re: [Patch v3 1/2] x86/mm/numa: Open code function early_get_boot_cpu_id

From: Ingo Molnar <mingo@kernel.org>
Date: 2016-08-10 18:12:01
Also in: lkml

* Baoquan He [off-list ref] wrote:
quoted hunk ↗ jump to hunk
Previously early_acpi_boot_init is called in early_get_boot_cpu_id()
to get value for boot_cpu_physical_apicid. Now early_acpi_boot_init()
has been taken out and moved to setup_arch(), the name of
early_get_boot_cpu_id doesn't match its implementation. And only the
getting boot-time SMP configuration code is left. So in this patch
open code it.

Signed-off-by: Baoquan He <redacted>
---
v1->v3:
  No change from v1.

 arch/x86/mm/amdtopology.c | 25 ++++++++-----------------
 1 file changed, 8 insertions(+), 17 deletions(-)
diff --git a/arch/x86/mm/amdtopology.c b/arch/x86/mm/amdtopology.c
index 2ca15b59..9928dad 100644
--- a/arch/x86/mm/amdtopology.c
+++ b/arch/x86/mm/amdtopology.c
@@ -53,21 +53,6 @@ static __init int find_northbridge(void)
 	return -ENOENT;
 }
 
-static __init void early_get_boot_cpu_id(void)
-{
-	/*
-	 * need to get the APIC ID of the BSP so can use that to
-	 * create apicid_to_node in amd_scan_nodes()
-	 */
-#ifdef CONFIG_X86_MPPARSE
-	/*
-	 * get boot-time SMP configuration:
-	 */
-	if (smp_found_config)
-		early_get_smp_config();
-#endif
-}
-
 int __init amd_numa_init(void)
 {
 	u64 start = PFN_PHYS(0);
@@ -181,8 +166,14 @@ int __init amd_numa_init(void)
 	cores = 1 << bits;
 	apicid_base = 0;
 
-	/* get the APIC ID of the BSP early for systems with apicid lifting */
-	early_get_boot_cpu_id();
+#ifdef CONFIG_X86_MPPARSE
+	/*
+	 * get boot-time SMP configuration:
+	 */
+	if (smp_found_config)
+		early_get_smp_config();
+#endif
So I think this cleanup could be improved: any reason why the smp_found_config 
check is not done in early_get_smp_config()?

Plus it appears there's already a !CONFIG_X86_MPPARSE version of 
early_get_smp_config() [but please double check that it's available under all 
legitimate Kconfig variants] so we could drop the ugly #ifdef as well.

Thanks,

	Ingo
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