linux-kernel - Re: [PATCH v2 09/11] x86/percpu/64: Remove INIT_PER

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Date:   Thu, 26 Oct 2023 20:48:49 +0200
From:   Uros Bizjak <ubizjak@...il.com>
To:     Brian Gerst <brgerst@...il.com>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org,
        Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>,
        "H . Peter Anvin" <hpa@...or.com>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH v2 09/11] x86/percpu/64: Remove INIT_PER_CPU macros

On Thu, Oct 26, 2023 at 6:01 PM Brian Gerst <brgerst@...il.com> wrote:
>
> The load and link addresses of percpu variables are now the same, so
> these macros are no longer necessary.
>
> Signed-off-by: Brian Gerst <brgerst@...il.com>

Reviewed-by: Uros Bizjak <ubizjak@...il.com>

> ---
>  arch/x86/include/asm/percpu.h | 22 ----------------------
>  arch/x86/kernel/irq_64.c      |  1 -
>  arch/x86/kernel/vmlinux.lds.S |  7 -------
>  arch/x86/tools/relocs.c       |  1 -
>  4 files changed, 31 deletions(-)
>
> diff --git a/arch/x86/include/asm/percpu.h b/arch/x86/include/asm/percpu.h
> index b86b27d15e52..7a176381ee01 100644
> --- a/arch/x86/include/asm/percpu.h
> +++ b/arch/x86/include/asm/percpu.h
> @@ -20,12 +20,6 @@
>
>  #define PER_CPU_VAR(var)       __percpu(var)__percpu_rel
>
> -#ifdef CONFIG_X86_64_SMP
> -#define INIT_PER_CPU_VAR(var)  init_per_cpu__##var
> -#else
> -#define INIT_PER_CPU_VAR(var)  var
> -#endif
> -
>  #else /* ...!ASSEMBLY */
>
>  #include <linux/kernel.h>
> @@ -96,22 +90,6 @@
>  #define __percpu_arg(x)                __percpu_prefix "%" #x
>  #define __force_percpu_arg(x)  __force_percpu_prefix "%" #x
>
> -/*
> - * Initialized pointers to per-cpu variables needed for the boot
> - * processor need to use these macros to get the proper address
> - * offset from __per_cpu_load on SMP.
> - *
> - * There also must be an entry in vmlinux_64.lds.S
> - */
> -#define DECLARE_INIT_PER_CPU(var) \
> -       extern typeof(var) init_per_cpu_var(var)
> -
> -#ifdef CONFIG_X86_64_SMP
> -#define init_per_cpu_var(var)  init_per_cpu__##var
> -#else
> -#define init_per_cpu_var(var)  var
> -#endif
> -
>  /* For arch-specific code, we can use direct single-insn ops (they
>   * don't give an lvalue though). */
>
> diff --git a/arch/x86/kernel/irq_64.c b/arch/x86/kernel/irq_64.c
> index fe0c859873d1..30424f9876bc 100644
> --- a/arch/x86/kernel/irq_64.c
> +++ b/arch/x86/kernel/irq_64.c
> @@ -26,7 +26,6 @@
>  #include <asm/apic.h>
>
>  DEFINE_PER_CPU_PAGE_ALIGNED(struct irq_stack, irq_stack_backing_store) __visible;
> -DECLARE_INIT_PER_CPU(irq_stack_backing_store);
>
>  #ifdef CONFIG_VMAP_STACK
>  /*
> diff --git a/arch/x86/kernel/vmlinux.lds.S b/arch/x86/kernel/vmlinux.lds.S
> index efa4885060b5..9aea7b6b02c7 100644
> --- a/arch/x86/kernel/vmlinux.lds.S
> +++ b/arch/x86/kernel/vmlinux.lds.S
> @@ -482,13 +482,6 @@ SECTIONS
>            "kernel image bigger than KERNEL_IMAGE_SIZE");
>
>  #ifdef CONFIG_X86_64
> -/*
> - * Per-cpu symbols which need to be offset from __per_cpu_load
> - * for the boot processor.
> - */
> -#define INIT_PER_CPU(x) init_per_cpu__##x = ABSOLUTE(x)
> -INIT_PER_CPU(gdt_page);
> -INIT_PER_CPU(irq_stack_backing_store);
>
>  #ifdef CONFIG_CPU_UNRET_ENTRY
>  . = ASSERT((retbleed_return_thunk & 0x3f) == 0, "retbleed_return_thunk not cacheline-aligned");
> diff --git a/arch/x86/tools/relocs.c b/arch/x86/tools/relocs.c
> index 7feb63179b62..931d90aa814c 100644
> --- a/arch/x86/tools/relocs.c
> +++ b/arch/x86/tools/relocs.c
> @@ -83,7 +83,6 @@ static const char * const sym_regex_kernel[S_NSYMTYPES] = {
>         "__initramfs_start|"
>         "(jiffies|jiffies_64)|"
>  #if ELF_BITS == 64
> -       "init_per_cpu__.*|"
>         "__end_rodata_hpage_align|"
>  #endif
>         "__vvar_page|"
> --
> 2.41.0
>