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Re: [patch V4 10/37] x86/smpboot: Get rid of cpu_init_secondary()
- To: Thomas Gleixner <tglx@xxxxxxxxxxxxx>, LKML <linux-kernel@xxxxxxxxxxxxxxx>
- From: Philippe Mathieu-Daudé <philmd@xxxxxxxxxx>
- Date: Tue, 13 Jun 2023 01:49:23 +0200
- Cc: x86@xxxxxxxxxx, David Woodhouse <dwmw2@xxxxxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Brian Gerst <brgerst@xxxxxxxxx>, Arjan van de Veen <arjan@xxxxxxxxxxxxxxx>, Paolo Bonzini <pbonzini@xxxxxxxxxx>, Paul McKenney <paulmck@xxxxxxxxxx>, Tom Lendacky <thomas.lendacky@xxxxxxx>, Sean Christopherson <seanjc@xxxxxxxxxx>, Oleksandr Natalenko <oleksandr@xxxxxxxxxxxxxx>, Paul Menzel <pmenzel@xxxxxxxxxxxxx>, "Guilherme G. Piccoli" <gpiccoli@xxxxxxxxxx>, Piotr Gorski <lucjan.lucjanov@xxxxxxxxx>, Usama Arif <usama.arif@xxxxxxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, Russell King <linux@xxxxxxxxxxxxxxx>, Arnd Bergmann <arnd@xxxxxxxx>, linux-arm-kernel@xxxxxxxxxxxxxxxxxxx, Catalin Marinas <catalin.marinas@xxxxxxx>, Will Deacon <will@xxxxxxxxxx>, Guo Ren <guoren@xxxxxxxxxx>, linux-csky@xxxxxxxxxxxxxxx, Thomas Bogendoerfer <tsbogend@xxxxxxxxxxxxxxxx>, linux-mips@xxxxxxxxxxxxxxx, "James E.J. Bottomley" <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx>, Helge Deller <deller@xxxxxx>, linux-parisc@xxxxxxxxxxxxxxx, Paul Walmsley <paul.walmsley@xxxxxxxxxx>, Palmer Dabbelt <palmer@xxxxxxxxxxx>, linux-riscv@xxxxxxxxxxxxxxxxxxx, Mark Rutland <mark.rutland@xxxxxxx>, Sabin Rapan <sabrapan@xxxxxxxxxx>, "Michael Kelley (LINUX)" <mikelley@xxxxxxxxxxxxx>, Ross Philipson <ross.philipson@xxxxxxxxxx>
- Delivery-date: Mon, 12 Jun 2023 23:49:29 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 12/5/23 23:07, Thomas Gleixner wrote:
From: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
The synchronization of the AP with the control CPU is a SMP boot problem
and has nothing to do with cpu_init().
Open code cpu_init_secondary() in start_secondary() and move
wait_for_master_cpu() into the SMP boot code.
No functional change.
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Tested-by: Michael Kelley <mikelley@xxxxxxxxxxxxx>
---
arch/x86/include/asm/processor.h | 1 -
arch/x86/kernel/cpu/common.c | 27 ---------------------------
arch/x86/kernel/smpboot.c | 24 +++++++++++++++++++-----
3 files changed, 19 insertions(+), 33 deletions(-)
Reviewed-by: Philippe Mathieu-Daudé <philmd@xxxxxxxxxx>
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