Re: [Xen-devel] [PATCH v2 1/2] xen/arm: link: Link proc_info_list in .data instead of .init.data

[Julien Grall <julien.grall@xxxxxxx>]

Hi Oleksandr,

On 07/12/2018 09:45, Oleksandr Tyshchenko wrote:
> From: Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx>
>
> To be able to use it for the hot-plugged CPUs as well.
You need to explain in the commit message why you rename .init.proc.info.

> Signed-off-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx>
>
> ---
>      Changes in v2:
>          - Fix typoes
>          - Rename ".init.proc.info" to ".data.proc.info"
> ---
>   xen/arch/arm/arm32/proc-v7.S |  6 +++---
>   xen/arch/arm/xen.lds.S       | 10 ++++++----
>   2 files changed, 9 insertions(+), 7 deletions(-)
>
> diff --git a/xen/arch/arm/arm32/proc-v7.S b/xen/arch/arm/arm32/proc-v7.S
> index 80a250d..a0c0c9e 100644
> --- a/xen/arch/arm/arm32/proc-v7.S
> +++ b/xen/arch/arm/arm32/proc-v7.S
> @@ -30,7 +30,7 @@ brahma15mp_init:
>           mcr   CP32(r0, ACTLR)
>           mov   pc, lr
>   
> -        .section ".init.proc.info", #alloc, #execinstr
> +        .section ".data.proc.info", #alloc, #execinstr
NIT: .proc.info would be sufficient. This would avoid to rename again the 
section if we decide to move it in a separate section.
>           .type __v7_ca15mp_proc_info, #object
>   __v7_ca15mp_proc_info:
>           .long 0x410FC0F0             /* Cortex-A15 */
> @@ -39,7 +39,7 @@ __v7_ca15mp_proc_info:
>           .long caxx_processor
>           .size __v7_ca15mp_proc_info, . - __v7_ca15mp_proc_info
>   
> -        .section ".init.proc.info", #alloc, #execinstr
> +        .section ".data.proc.info", #alloc, #execinstr
>           .type __v7_ca7mp_proc_info, #object
>   __v7_ca7mp_proc_info:
>           .long 0x410FC070             /* Cortex-A7 */
> @@ -48,7 +48,7 @@ __v7_ca7mp_proc_info:
>           .long caxx_processor
>           .size __v7_ca7mp_proc_info, . - __v7_ca7mp_proc_info
>   
> -        .section ".init.proc.info", #alloc, #execinstr
> +        .section ".data.proc.info", #alloc, #execinstr
>           .type __v7_brahma15mp_proc_info, #object
>   __v7_brahma15mp_proc_info:
>           .long 0x420F00F0             /* Broadcom Brahma-B15 */
> diff --git a/xen/arch/arm/xen.lds.S b/xen/arch/arm/xen.lds.S
> index 245a0e0..624da9b 100644
> --- a/xen/arch/arm/xen.lds.S
> +++ b/xen/arch/arm/xen.lds.S
> @@ -88,6 +88,12 @@ SECTIONS
>          . = ALIGN(PAGE_SIZE);
>          *(.data.page_aligned)
>          *(.data)
> +
> +       . = ALIGN(POINTER_ALIGN);
> +       __proc_info_start = .;
> +       *(.data.proc.info)
> +       __proc_info_end = .;
Sorry I haven't noticed it in the previous version. proc.info should never 
modified, right? So it should be in rodata in that case.
> +
>          . = ALIGN(8);
>          __start_schedulers_array = .;
>          *(.data.schedulers)
> @@ -151,10 +157,6 @@ SECTIONS
>          *(.init.setup)
>          __setup_end = .;
>   
> -       __proc_info_start = .;
> -       *(.init.proc.info)
> -       __proc_info_end = .;
> -
>          __initcall_start = .;
>          *(.initcallpresmp.init)
>          __presmp_initcall_end = .;
Cheers,

--
Julien Grall

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