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Re: [PATCH v2] of: Specify initrd location using 64-bit

To: Santosh Shilimkar <santosh.shilimkar@ti.com>
Subject: Re: [PATCH v2] of: Specify initrd location using 64-bit
From: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Date: Mon, 22 Jul 2013 17:01:35 +0200
Cc: grant.likely@linaro.org, Rob Herring <rob.herring@calxeda.com>, Geert Uytterhoeven <geert@linux-m68k.org>, Sebastian Andrzej Siewior <bigeasy@linutronix.de>, Vineet Gupta <vgupta@synopsys.com>, Russell King <linux@arm.linux.org.uk>, Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will.deacon@arm.com>, Mark Salter <msalter@redhat.com>, Aurelien Jacquiot <a-jacquiot@ti.com>, James Hogan <james.hogan@imgtec.com>, Michal Simek <monstr@monstr.eu>, Ralf Baechle <ralf@linux-mips.org>, Jonas Bonn <jonas@southpole.se>, Benjamin Herrenschmidt <benh@kernel.crashing.org>, Paul Mackerras <paulus@samba.org>, x86@kernel.org, arm@kernel.org, Chris Zankel <chris@zankel.net>, Max Filippov <jcmvbkbc@gmail.com>, robherring2@gmail.com, Nicolas Pitre <nicolas.pitre@linaro.org>, linux-arm-kernel@lists.infradead.org, linux-c6x-dev@linux-c6x.org, linux-mips@linux-mips.org, linuxppc-dev@lists.ozlabs.org, linux-xtensa@linux-xtensa.org, devicetree-discuss@lists.ozlabs.org
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On 14:20 Mon 01 Jul     , Santosh Shilimkar wrote:
> On some PAE architectures, the entire range of physical memory could reside
> outside the 32-bit limit.  These systems need the ability to specify the
> initrd location using 64-bit numbers.
> 
> This patch globally modifies the early_init_dt_setup_initrd_arch() function to
> use 64-bit numbers instead of the current unsigned long.
> 
> There has been quite a bit of debate about whether to use u64 or phys_addr_t.
> It was concluded to stick to u64 to be consistent with rest of the device
> tree code. As summarized by Geert, "The address to load the initrd is decided
> by the bootloader/user and set at that point later in time. The dtb should not
> be tied to the kernel you are booting"
> 
> More details on the discussion can be found here:
> https://lkml.org/lkml/2013/6/20/690
> https://lkml.org/lkml/2012/9/13/544
> 
> Cc: Grant Likely <grant.likely@linaro.org>
> Cc: Rob Herring <rob.herring@calxeda.com>
> Cc: Geert Uytterhoeven <geert@linux-m68k.org>
> Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
> Cc: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
> Cc: Vineet Gupta <vgupta@synopsys.com>
> Cc: Russell King <linux@arm.linux.org.uk>
> Cc: Catalin Marinas <catalin.marinas@arm.com>
> Cc: Will Deacon <will.deacon@arm.com>
> Cc: Mark Salter <msalter@redhat.com>
> Cc: Aurelien Jacquiot <a-jacquiot@ti.com>
> Cc: James Hogan <james.hogan@imgtec.com>
> Cc: Michal Simek <monstr@monstr.eu>
> Cc: Ralf Baechle <ralf@linux-mips.org>
> Cc: Jonas Bonn <jonas@southpole.se>
> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
> Cc: Paul Mackerras <paulus@samba.org>
> Cc: x86@kernel.org
> Cc: arm@kernel.org
> Cc: Chris Zankel <chris@zankel.net>
> Cc: Max Filippov <jcmvbkbc@gmail.com>
> Cc: bigeasy@linutronix.de
> Cc: robherring2@gmail.com
> Cc: Nicolas Pitre <nicolas.pitre@linaro.org>

Acked-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>

> 
> Cc: linux-arm-kernel@lists.infradead.org
> Cc: linux-c6x-dev@linux-c6x.org
> Cc: linux-mips@linux-mips.org
> Cc: linuxppc-dev@lists.ozlabs.org
> Cc: linux-xtensa@linux-xtensa.org
> Cc: devicetree-discuss@lists.ozlabs.org
> 
> Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
> ---
>  arch/arc/mm/init.c            |    5 ++---
>  arch/arm/mm/init.c            |    2 +-
>  arch/arm64/mm/init.c          |    3 +--
>  arch/c6x/kernel/devicetree.c  |    3 +--
>  arch/metag/mm/init.c          |    5 ++---
>  arch/microblaze/kernel/prom.c |    3 +--
>  arch/mips/kernel/prom.c       |    3 +--
>  arch/openrisc/kernel/prom.c   |    3 +--
>  arch/powerpc/kernel/prom.c    |    3 +--
>  arch/x86/kernel/devicetree.c  |    3 +--
>  arch/xtensa/kernel/setup.c    |    3 +--
>  drivers/of/fdt.c              |   10 ++++++----
>  include/linux/of_fdt.h        |    3 +--
>  13 files changed, 20 insertions(+), 29 deletions(-)
> 
> diff --git a/arch/arc/mm/init.c b/arch/arc/mm/init.c
> index 4a17736..7991e08 100644
> --- a/arch/arc/mm/init.c
> +++ b/arch/arc/mm/init.c
> @@ -157,9 +157,8 @@ void __init free_initrd_mem(unsigned long start, unsigned 
> long end)
>  #endif
>  
>  #ifdef CONFIG_OF_FLATTREE
> -void __init early_init_dt_setup_initrd_arch(unsigned long start,
> -                                         unsigned long end)
> +void __init early_init_dt_setup_initrd_arch(u64 start, u64 end)
>  {
> -     pr_err("%s(%lx, %lx)\n", __func__, start, end);
> +     pr_err("%s(%llx, %llx)\n", __func__, start, end);
>  }
>  #endif /* CONFIG_OF_FLATTREE */
> diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c
> index 9a5cdc0..afeaef7 100644
> --- a/arch/arm/mm/init.c
> +++ b/arch/arm/mm/init.c
> @@ -76,7 +76,7 @@ static int __init parse_tag_initrd2(const struct tag *tag)
>  __tagtable(ATAG_INITRD2, parse_tag_initrd2);
>  
>  #ifdef CONFIG_OF_FLATTREE
> -void __init early_init_dt_setup_initrd_arch(unsigned long start, unsigned 
> long end)
> +void __init early_init_dt_setup_initrd_arch(u64 start, u64 end)
>  {
>       phys_initrd_start = start;
>       phys_initrd_size = end - start;
> diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
> index f497ca7..7047708 100644
> --- a/arch/arm64/mm/init.c
> +++ b/arch/arm64/mm/init.c
> @@ -44,8 +44,7 @@ static unsigned long phys_initrd_size __initdata = 0;
>  
>  phys_addr_t memstart_addr __read_mostly = 0;
>  
> -void __init early_init_dt_setup_initrd_arch(unsigned long start,
> -                                         unsigned long end)
> +void __init early_init_dt_setup_initrd_arch(u64 start, u64 end)
>  {
>       phys_initrd_start = start;
>       phys_initrd_size = end - start;
> diff --git a/arch/c6x/kernel/devicetree.c b/arch/c6x/kernel/devicetree.c
> index bdb56f0..287d0e6 100644
> --- a/arch/c6x/kernel/devicetree.c
> +++ b/arch/c6x/kernel/devicetree.c
> @@ -33,8 +33,7 @@ void __init early_init_devtree(void *params)
>  
>  
>  #ifdef CONFIG_BLK_DEV_INITRD
> -void __init early_init_dt_setup_initrd_arch(unsigned long start,
> -             unsigned long end)
> +void __init early_init_dt_setup_initrd_arch(u64 start, u64 end)
>  {
>       initrd_start = (unsigned long)__va(start);
>       initrd_end = (unsigned long)__va(end);
> diff --git a/arch/metag/mm/init.c b/arch/metag/mm/init.c
> index d05b845..bdc4811 100644
> --- a/arch/metag/mm/init.c
> +++ b/arch/metag/mm/init.c
> @@ -419,10 +419,9 @@ void free_initrd_mem(unsigned long start, unsigned long 
> end)
>  #endif
>  
>  #ifdef CONFIG_OF_FLATTREE
> -void __init early_init_dt_setup_initrd_arch(unsigned long start,
> -                                         unsigned long end)
> +void __init early_init_dt_setup_initrd_arch(u64 start, u64 end)
>  {
> -     pr_err("%s(%lx, %lx)\n",
> +     pr_err("%s(%llx, %llx)\n",
>              __func__, start, end);
>  }
>  #endif /* CONFIG_OF_FLATTREE */
> diff --git a/arch/microblaze/kernel/prom.c b/arch/microblaze/kernel/prom.c
> index 0a2c68f..62e2e8f 100644
> --- a/arch/microblaze/kernel/prom.c
> +++ b/arch/microblaze/kernel/prom.c
> @@ -136,8 +136,7 @@ void __init early_init_devtree(void *params)
>  }
>  
>  #ifdef CONFIG_BLK_DEV_INITRD
> -void __init early_init_dt_setup_initrd_arch(unsigned long start,
> -             unsigned long end)
> +void __init early_init_dt_setup_initrd_arch(u64 start, u64 end)
>  {
>       initrd_start = (unsigned long)__va(start);
>       initrd_end = (unsigned long)__va(end);
> diff --git a/arch/mips/kernel/prom.c b/arch/mips/kernel/prom.c
> index 5712bb5..32b8788 100644
> --- a/arch/mips/kernel/prom.c
> +++ b/arch/mips/kernel/prom.c
> @@ -58,8 +58,7 @@ void * __init early_init_dt_alloc_memory_arch(u64 size, u64 
> align)
>  }
>  
>  #ifdef CONFIG_BLK_DEV_INITRD
> -void __init early_init_dt_setup_initrd_arch(unsigned long start,
> -                                         unsigned long end)
> +void __init early_init_dt_setup_initrd_arch(u64 start, u64 end)
>  {
>       initrd_start = (unsigned long)__va(start);
>       initrd_end = (unsigned long)__va(end);
> diff --git a/arch/openrisc/kernel/prom.c b/arch/openrisc/kernel/prom.c
> index 5869e3f..150215a 100644
> --- a/arch/openrisc/kernel/prom.c
> +++ b/arch/openrisc/kernel/prom.c
> @@ -96,8 +96,7 @@ void __init early_init_devtree(void *params)
>  }
>  
>  #ifdef CONFIG_BLK_DEV_INITRD
> -void __init early_init_dt_setup_initrd_arch(unsigned long start,
> -             unsigned long end)
> +void __init early_init_dt_setup_initrd_arch(u64 start, u64 end)
>  {
>       initrd_start = (unsigned long)__va(start);
>       initrd_end = (unsigned long)__va(end);
> diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c
> index 8b6f7a9..2f3e252 100644
> --- a/arch/powerpc/kernel/prom.c
> +++ b/arch/powerpc/kernel/prom.c
> @@ -550,8 +550,7 @@ void * __init early_init_dt_alloc_memory_arch(u64 size, 
> u64 align)
>  }
>  
>  #ifdef CONFIG_BLK_DEV_INITRD
> -void __init early_init_dt_setup_initrd_arch(unsigned long start,
> -             unsigned long end)
> +void __init early_init_dt_setup_initrd_arch(u64 start, u64 end)
>  {
>       initrd_start = (unsigned long)__va(start);
>       initrd_end = (unsigned long)__va(end);
> diff --git a/arch/x86/kernel/devicetree.c b/arch/x86/kernel/devicetree.c
> index b158152..2fbad6b 100644
> --- a/arch/x86/kernel/devicetree.c
> +++ b/arch/x86/kernel/devicetree.c
> @@ -52,8 +52,7 @@ void * __init early_init_dt_alloc_memory_arch(u64 size, u64 
> align)
>  }
>  
>  #ifdef CONFIG_BLK_DEV_INITRD
> -void __init early_init_dt_setup_initrd_arch(unsigned long start,
> -                                         unsigned long end)
> +void __init early_init_dt_setup_initrd_arch(u64 start, u64 end)
>  {
>       initrd_start = (unsigned long)__va(start);
>       initrd_end = (unsigned long)__va(end);
> diff --git a/arch/xtensa/kernel/setup.c b/arch/xtensa/kernel/setup.c
> index 6dd25ec..d45e602 100644
> --- a/arch/xtensa/kernel/setup.c
> +++ b/arch/xtensa/kernel/setup.c
> @@ -170,8 +170,7 @@ static int __init parse_tag_fdt(const bp_tag_t *tag)
>  
>  __tagtable(BP_TAG_FDT, parse_tag_fdt);
>  
> -void __init early_init_dt_setup_initrd_arch(unsigned long start,
> -             unsigned long end)
> +void __init early_init_dt_setup_initrd_arch(u64 start, u64 end)
>  {
>       initrd_start = (void *)__va(start);
>       initrd_end = (void *)__va(end);
> diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
> index 808be06..21123b8 100644
> --- a/drivers/of/fdt.c
> +++ b/drivers/of/fdt.c
> @@ -550,7 +550,8 @@ int __init of_flat_dt_match(unsigned long node, const 
> char *const *compat)
>   */
>  void __init early_init_dt_check_for_initrd(unsigned long node)
>  {
> -     unsigned long start, end, len;
> +     u64 start, end;
> +     unsigned long len;
>       __be32 *prop;
>  
>       pr_debug("Looking for initrd properties... ");
> @@ -558,15 +559,16 @@ void __init early_init_dt_check_for_initrd(unsigned 
> long node)
>       prop = of_get_flat_dt_prop(node, "linux,initrd-start", &len);
>       if (!prop)
>               return;
> -     start = of_read_ulong(prop, len/4);
> +     start = of_read_number(prop, len/4);
>  
>       prop = of_get_flat_dt_prop(node, "linux,initrd-end", &len);
>       if (!prop)
>               return;
> -     end = of_read_ulong(prop, len/4);
> +     end = of_read_number(prop, len/4);
>  
>       early_init_dt_setup_initrd_arch(start, end);
> -     pr_debug("initrd_start=0x%lx  initrd_end=0x%lx\n", start, end);
> +     pr_debug("initrd_start=0x%llx  initrd_end=0x%llx\n",
> +              (unsigned long long)start, (unsigned long long)end);
>  }
>  #else
>  inline void early_init_dt_check_for_initrd(unsigned long node)
> diff --git a/include/linux/of_fdt.h b/include/linux/of_fdt.h
> index ed136ad..4a17939 100644
> --- a/include/linux/of_fdt.h
> +++ b/include/linux/of_fdt.h
> @@ -106,8 +106,7 @@ extern u64 dt_mem_next_cell(int s, __be32 **cellp);
>   * physical addresses.
>   */
>  #ifdef CONFIG_BLK_DEV_INITRD
> -extern void early_init_dt_setup_initrd_arch(unsigned long start,
> -                                         unsigned long end);
> +extern void early_init_dt_setup_initrd_arch(u64 start, u64 end);
>  #endif
>  
>  /* Early flat tree scan hooks */
> -- 
> 1.7.9.5
> 

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