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| author | Roman Kisel <romank@linux.microsoft.com> | 2025-05-07 11:22:26 -0700 |
|---|---|---|
| committer | Wei Liu <wei.liu@kernel.org> | 2025-05-23 16:30:56 +0000 |
| commit | 43cb39ad260a168abf6da3a48f394afff92d436b (patch) | |
| tree | 0f6d3729bc472fc2958f7bd6d9d856f1a4990681 /arch/x86/kernel/acpi | |
| parent | 86c48271e0d60c82665e9fd61277002391efcef7 (diff) | |
| download | linux-next-43cb39ad260a168abf6da3a48f394afff92d436b.tar.gz linux-next-43cb39ad260a168abf6da3a48f394afff92d436b.zip | |
arch/x86: Provide the CPU number in the wakeup AP callback
When starting APs, confidential guests and paravisor guests
need to know the CPU number, and the pattern of using the linear
search has emerged in several places. With N processors that leads
to the O(N^2) time complexity.
Provide the CPU number in the AP wake up callback so that one can
get the CPU number in constant time.
Suggested-by: Michael Kelley <mhklinux@outlook.com>
Signed-off-by: Roman Kisel <romank@linux.microsoft.com>
Reviewed-by: Tom Lendacky <thomas.lendacky@amd.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Michael Kelley <mhklinux@outlook.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Link: https://lore.kernel.org/r/20250507182227.7421-3-romank@linux.microsoft.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Message-ID: <20250507182227.7421-3-romank@linux.microsoft.com>
Diffstat (limited to 'arch/x86/kernel/acpi')
| -rw-r--r-- | arch/x86/kernel/acpi/madt_wakeup.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/kernel/acpi/madt_wakeup.c b/arch/x86/kernel/acpi/madt_wakeup.c index f36f28405dcc..6d7603511f52 100644 --- a/arch/x86/kernel/acpi/madt_wakeup.c +++ b/arch/x86/kernel/acpi/madt_wakeup.c @@ -126,7 +126,7 @@ static int __init acpi_mp_setup_reset(u64 reset_vector) return 0; } -static int acpi_wakeup_cpu(u32 apicid, unsigned long start_ip) +static int acpi_wakeup_cpu(u32 apicid, unsigned long start_ip, unsigned int cpu) { if (!acpi_mp_wake_mailbox_paddr) { pr_warn_once("No MADT mailbox: cannot bringup secondary CPUs. Booting with kexec?\n"); |