linux-kernel - Re: [PATCH] LoongArch: Add PREEMPT

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Message-ID: <CAAhV-H61P1Qnocn1eEOszufcj=BzC_8cPZVfTw-ui8M+nmxZdw@mail.gmail.com>
Date: Thu, 21 Nov 2024 12:07:39 +0800
From: Huacai Chen <chenhuacai@...nel.org>
To: Xi Ruoyao <xry111@...111.site>
Cc: WANG Xuerui <kernel@...0n.name>, Peter Zijlstra <peterz@...radead.org>, 
	Tiezhu Yang <yangtiezhu@...ngson.cn>, Jinyang He <hejinyang@...ngson.cn>, 
	loongarch@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] LoongArch: Add PREEMPT_LAZY support

Hmmm, I have just written the same patch...
https://github.com/chenhuacai/linux/commit/d908e12e493173df4a3edf23c4a265385f475621

Huacai

On Thu, Nov 21, 2024 at 11:42 AM Xi Ruoyao <xry111@...111.site> wrote:
>
> Like x86 and RISC-V, we are using GENERIC_ENTRY so supporting
> PREEMPT_LAZY just needs to allocate a bit in thread flags.
>
> Signed-off-by: Xi Ruoyao <xry111@...111.site>
> ---
>  arch/loongarch/Kconfig                   | 1 +
>  arch/loongarch/include/asm/thread_info.h | 8 +++++---
>  2 files changed, 6 insertions(+), 3 deletions(-)
>
> diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig
> index d9fce0fd475a..b8cc5997d595 100644
> --- a/arch/loongarch/Kconfig
> +++ b/arch/loongarch/Kconfig
> @@ -25,6 +25,7 @@ config LOONGARCH
>         select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
>         select ARCH_HAS_PTE_DEVMAP
>         select ARCH_HAS_PTE_SPECIAL
> +       select ARCH_HAS_PREEMPT_LAZY
>         select ARCH_HAS_SET_MEMORY
>         select ARCH_HAS_SET_DIRECT_MAP
>         select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
> diff --git a/arch/loongarch/include/asm/thread_info.h b/arch/loongarch/include/asm/thread_info.h
> index 8bf0e6f51546..fd68a6d81b8e 100644
> --- a/arch/loongarch/include/asm/thread_info.h
> +++ b/arch/loongarch/include/asm/thread_info.h
> @@ -66,8 +66,9 @@ register unsigned long current_stack_pointer __asm__("$sp");
>   * - pending work-to-be-done flags are in LSW
>   * - other flags in MSW
>   */
> -#define TIF_SIGPENDING         1       /* signal pending */
> -#define TIF_NEED_RESCHED       2       /* rescheduling necessary */
> +#define TIF_NEED_RESCHED       0       /* rescheduling necessary */
> +#define TIF_NEED_RESCHED_LAZY  1       /* Lazy rescheduling needed */
> +#define TIF_SIGPENDING         2       /* signal pending */
>  #define TIF_NOTIFY_RESUME      3       /* callback before returning to user */
>  #define TIF_NOTIFY_SIGNAL      4       /* signal notifications exist */
>  #define TIF_RESTORE_SIGMASK    5       /* restore signal mask in do_signal() */
> @@ -88,8 +89,9 @@ register unsigned long current_stack_pointer __asm__("$sp");
>  #define TIF_LBT_CTX_LIVE       20      /* LBT context must be preserved */
>  #define TIF_PATCH_PENDING      21      /* pending live patching update */
>
> -#define _TIF_SIGPENDING                (1<<TIF_SIGPENDING)
>  #define _TIF_NEED_RESCHED      (1<<TIF_NEED_RESCHED)
> +#define _TIF_NEED_RESCHED_LAZY (1<<TIF_NEED_RESCHED_LAZY)
> +#define _TIF_SIGPENDING                (1<<TIF_SIGPENDING)
>  #define _TIF_NOTIFY_RESUME     (1<<TIF_NOTIFY_RESUME)
>  #define _TIF_NOTIFY_SIGNAL     (1<<TIF_NOTIFY_SIGNAL)
>  #define _TIF_NOHZ              (1<<TIF_NOHZ)
>
> base-commit: 43fb83c17ba2d63dfb798f0be7453ed55ca3f9c2
> --
> 2.47.0
>
>