linux-kernel - Re: [PATCH v4 6/6] arch: Move initrd= parsing into do_mounts

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Message-ID: <C2D7FE5348E1B147BCA15975FBA23075013A5929ED@us01wembx1.internal.synopsys.com>
Date:   Tue, 13 Nov 2018 00:34:15 +0000
From:   Vineet Gupta <vineet.gupta1@...opsys.com>
To:     Florian Fainelli <f.fainelli@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Marc Zyngier" <marc.zyngier@....com>,
        Russell King <rmk+kernel@...linux.org.uk>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Andrey Konovalov <andreyknvl@...gle.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Robin Murphy <robin.murphy@....com>,
        Laura Abbott <labbott@...hat.com>,
        Stefan Agner <stefan@...er.ch>,
        Johannes Weiner <hannes@...xchg.org>,
        "Greg Hackmann" <ghackmann@...roid.com>,
        Kristina Martsenko <kristina.martsenko@....com>,
        CHANDAN VN <chandan.vn@...sung.com>,
        "moderated list:ARM64 PORT (AARCH64 ARCHITECTURE)" 
        <linux-arm-kernel@...ts.infradead.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE" 
        <devicetree@...r.kernel.org>,
        "rppt@...ux.ibm.com" <rppt@...ux.ibm.com>,
        "linux@...linux.org.uk" <linux@...linux.org.uk>,
        "green.hu@...il.com" <green.hu@...il.com>,
        "deanbo422@...il.com" <deanbo422@...il.com>,
        "gxt@....edu.cn" <gxt@....edu.cn>,
        "ard.biesheuvel@...aro.org" <ard.biesheuvel@...aro.org>,
        "linux-snps-arc@...ts.infradead.org" 
        <linux-snps-arc@...ts.infradead.org>,
        "vineet.gupta1@...opsys.com" <vineet.gupta1@...opsys.com>
Subject: Re: [PATCH v4 6/6] arch: Move initrd= parsing into
 do_mounts_initrd.c

On 11/5/18 2:58 PM, Florian Fainelli wrote:
> ARC, ARM, ARM64 and Unicore32 are all capable of parsing the "initrd="
> command line parameter to allow specifying the physical address and size
> of an initrd. Move that parsing into init/do_mounts_initrd.c such that
> we no longer duplicate that logic.
>
> Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
> ---
>  arch/arc/mm/init.c       | 25 +++++--------------------
>  arch/arm/mm/init.c       | 17 -----------------
>  arch/arm64/mm/init.c     | 18 ------------------
>  arch/unicore32/mm/init.c | 18 ------------------
>  init/do_mounts_initrd.c  | 17 +++++++++++++++++
>  5 files changed, 22 insertions(+), 73 deletions(-)
>
> diff --git a/arch/arc/mm/init.c b/arch/arc/mm/init.c
> index f8fe5668b30f..43bf4c3a1290 100644
> --- a/arch/arc/mm/init.c
> +++ b/arch/arc/mm/init.c
> @@ -78,24 +78,6 @@ void __init early_init_dt_add_memory_arch(u64 base, u64 size)
>  		base, TO_MB(size), !in_use ? "Not used":"");
>  }
>  
> -#ifdef CONFIG_BLK_DEV_INITRD
> -static int __init early_initrd(char *p)
> -{
> -	unsigned long start, size;
> -	char *endp;
> -
> -	start = memparse(p, &endp);
> -	if (*endp == ',') {
> -		size = memparse(endp + 1, NULL);
> -
> -		initrd_start = (unsigned long)__va(start);
> -		initrd_end = (unsigned long)__va(start + size);
> -	}
> -	return 0;
> -}
> -early_param("initrd", early_initrd);
> -#endif
> -
>  /*
>   * First memory setup routine called from setup_arch()
>   * 1. setup swapper's mm @init_mm
> @@ -140,8 +122,11 @@ void __init setup_arch_memory(void)
>  	memblock_reserve(low_mem_start, __pa(_end) - low_mem_start);
>  
>  #ifdef CONFIG_BLK_DEV_INITRD
> -	if (initrd_start)
> -		memblock_reserve(__pa(initrd_start), initrd_end - initrd_start);
> +	if (phys_initrd_size) {
> +		memblock_reserve(phys_initrd_start, phys_initrd_size);
> +		initrd_start = (unsigned long)__va(phys_initrd_start);
> +		initrd_end = initrd_start + phys_initrd_size;
> +	}
>  #endif

The common code now uses phys_initrd*, and you also use the same in ARC code, do
we still need the initrd_* setting here ?
ARC semantics was using them as PA anyways.

[snip]...

>  /*
>   * This keeps memory configuration data used by a couple memory
>   * initialization functions, as well as show_mem() for the skipping
> diff --git a/init/do_mounts_initrd.c b/init/do_mounts_initrd.c
> index 45865b72f4ea..732d21f4a637 100644
> --- a/init/do_mounts_initrd.c
> +++ b/init/do_mounts_initrd.c
> @@ -27,6 +27,23 @@ static int __init no_initrd(char *str)
>  
>  __setup("noinitrd", no_initrd);
>  
> +static int __init early_initrd(char *p)
> +{
> +	phys_addr_t start;
> +	unsigned long size;
> +	char *endp;
> +
> +	start = memparse(p, &endp);
> +	if (*endp == ',') {
> +		size = memparse(endp + 1, NULL);
> +
> +		phys_initrd_start = start;
> +		phys_initrd_size = size;
> +	}
> +	return 0;
> +}
> +early_param("initrd", early_initrd);
> +
>  static int init_linuxrc(struct subprocess_info *info, struct cred *new)
>  {
>  	ksys_unshare(CLONE_FS | CLONE_FILES);