[tip: x86/apic] x86/ioapic/32: Decrapify phys_id_present_map operation

[tip-bot2 for Thomas Gleixner]

The following commit has been merged into the x86/apic branch of tip:

Commit-ID:     6026bdba949934b45b7e3ae2babbb7c58d4daeca
Gitweb:        https://git.kernel.org/tip/6026bdba949934b45b7e3ae2babbb7c58d4daeca
Author:        Thomas Gleixner <tglx@xxxxxxxxxxxxx>
AuthorDate:    Tue, 08 Aug 2023 15:03:59 -07:00
Committer:     Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
CommitterDate: Wed, 09 Aug 2023 08:10:12 -07:00

x86/ioapic/32: Decrapify phys_id_present_map operation

The operation to set the IOAPIC ID in phys_id_present_map is as convoluted
as it can be.

  1) Allocate a bitmap of 32byte size on the stack
  2) Zero the bitmap and set the IOAPIC ID bit
  3) Or the temporary bitmap over phys_id_present_map

The same functionality can be achieved by setting the IOAPIC ID bit
directly in the phys_id_present_map.

Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Acked-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
---
 arch/x86/kernel/apic/io_apic.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 8c47099..ff2d27e 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -1511,12 +1511,9 @@ void __init setup_ioapic_ids_from_mpc_nocheck(void)
 			physid_set(i, phys_id_present_map);
 			ioapics[ioapic_idx].mp_config.apicid = i;
 		} else {
-			physid_mask_t tmp;
-
-			physid_set_mask_of_physid(mpc_ioapic_id(ioapic_idx), &tmp);
 			apic_printk(APIC_VERBOSE, "Setting %d in the phys_id_present_map\n",
 				    mpc_ioapic_id(ioapic_idx));
-			physids_or(phys_id_present_map, phys_id_present_map, tmp);
+			physid_set(mpc_ioapic_id(ioapic_idx), phys_id_present_map);
 		}
 
 		/*