linux-kernel - Re: [PATCH v5 1/2] sh: Restructure call site for early_reserve

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Message-ID: <f36740a3b7f5a4b031aa656533403f1f@artur-rojek.eu>
Date: Sun, 29 Sep 2024 22:34:54 +0200
From: Artur Rojek <contact@...ur-rojek.eu>
To: Oreoluwa Babatunde <quic_obabatun@...cinc.com>
Cc: dalias@...c.org, glaubitz@...sik.fu-berlin.de,
 ysato@...rs.sourceforge.jp, kernel@...cinc.com,
 linux-kernel@...r.kernel.org, linux-sh@...r.kernel.org, robh+dt@...nel.org,
 Geert Uytterhoeven <geert+renesas@...der.be>
Subject: Re: [PATCH v5 1/2] sh: Restructure call site for early_reserve_mem()

On 2024-07-18 04:18, Oreoluwa Babatunde wrote:
> early_reserve_mem() reserves memory for important regions in the kernel
> such as kernel text region and bootmem bitmap.
> Reserving these memory regions should take precedence over any other
> reserved memory allocations so that the system does not unknowingly
> reserve them for some other use case.
> 
> Hence, move the call site of early_reserve_mem() out of the
> paging_init() function and into an earlier point in setup_arch()
> 
> Signed-off-by: Oreoluwa Babatunde <quic_obabatun@...cinc.com>

Hi Oreoluwa,

the patch is looking fine to me. Verified on J2 Turtle Board.

Reviewed-by: Artur Rojek <contact@...ur-rojek.eu>

Cheers,
Artur

> ---
>  arch/sh/include/asm/mmu.h | 1 +
>  arch/sh/kernel/setup.c    | 3 +++
>  arch/sh/mm/init.c         | 5 ++---
>  3 files changed, 6 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/sh/include/asm/mmu.h b/arch/sh/include/asm/mmu.h
> index 172e329fd92d..696e303a2f19 100644
> --- a/arch/sh/include/asm/mmu.h
> +++ b/arch/sh/include/asm/mmu.h
> @@ -96,6 +96,7 @@ static inline int pmb_unmap(void __iomem *addr)
> 
>  #endif /* CONFIG_PMB */
> 
> +void __init early_reserve_mem(void);
>  static inline void __iomem *
>  pmb_remap(phys_addr_t phys, unsigned long size, pgprot_t prot)
>  {
> diff --git a/arch/sh/kernel/setup.c b/arch/sh/kernel/setup.c
> index 620e5cf8ae1e..3b0bc191a2a2 100644
> --- a/arch/sh/kernel/setup.c
> +++ b/arch/sh/kernel/setup.c
> @@ -40,6 +40,7 @@
>  #include <asm/setup.h>
>  #include <asm/clock.h>
>  #include <asm/smp.h>
> +#include <asm/mmu.h>
>  #include <asm/mmu_context.h>
>  #include <asm/mmzone.h>
>  #include <asm/processor.h>
> @@ -319,6 +320,8 @@ void __init setup_arch(char **cmdline_p)
> 
>  	sh_mv_setup();
> 
> +	early_reserve_mem();
> +
>  	/* Let earlyprintk output early console messages */
>  	sh_early_platform_driver_probe("earlyprintk", 1, 1);
> 
> diff --git a/arch/sh/mm/init.c b/arch/sh/mm/init.c
> index bf1b54055316..643e3617c6a6 100644
> --- a/arch/sh/mm/init.c
> +++ b/arch/sh/mm/init.c
> @@ -19,6 +19,7 @@
>  #include <linux/io.h>
>  #include <linux/dma-mapping.h>
>  #include <linux/export.h>
> +#include <asm/mmu.h>
>  #include <asm/mmu_context.h>
>  #include <asm/mmzone.h>
>  #include <asm/kexec.h>
> @@ -242,7 +243,7 @@ static void __init do_init_bootmem(void)
>  	sparse_init();
>  }
> 
> -static void __init early_reserve_mem(void)
> +void __init early_reserve_mem(void)
>  {
>  	unsigned long start_pfn;
>  	u32 zero_base = (u32)__MEMORY_START + (u32)PHYSICAL_OFFSET;
> @@ -282,8 +283,6 @@ void __init paging_init(void)
> 
>  	sh_mv.mv_mem_init();
> 
> -	early_reserve_mem();
> -
>  	/*
>  	 * Once the early reservations are out of the way, give the
>  	 * platforms a chance to kick out some memory.