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Date: Tue, 19 Nov 2013 13:24:03 +0000
From: James Hogan <james.hogan@...tec.com>
To: Geert Uytterhoeven <geert@...ux-m68k.org>
CC: Andrew Morton <akpm@...ux-foundation.org>,
<linux-arch@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
Vineet Gupta <vgupta@...opsys.com>,
"Ralf Baechle" <ralf@...ux-mips.org>,
Jonas Bonn <jonas@...thpole.se>,
Chris Zankel <chris@...kel.net>,
Rob Herring <rob.herring@...xeda.com>,
<devicetree@...r.kernel.org>,
linux-metag <linux-metag@...r.kernel.org>
Subject: Re: [PATCH 14/17] dt: Consolidate __dtb_start declarations in <linux/of_fdt.h>
On 12/11/13 19:42, Geert Uytterhoeven wrote:
> The different architectures used their own (and different) declarations:
>
> extern struct boot_param_header __dtb_start;
> extern u32 __dtb_start[];
> extern char __dtb_start[];
>
> Consolidate them using the first variant in <linux/of_fdt.h>.
> This requires adding a few "address of" operators on architectures where
> __dtb_start was an array before.
>
> Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>
> Cc: Vineet Gupta <vgupta@...opsys.com>
> Cc: James Hogan <james.hogan@...tec.com>
> Cc: Ralf Baechle <ralf@...ux-mips.org>
> Cc: Jonas Bonn <jonas@...thpole.se>
> CC: Chris Zankel <chris@...kel.net>
> Cc: Rob Herring <rob.herring@...xeda.com>
> Cc: devicetree@...r.kernel.org
Acked-by: James Hogan <james.hogan@...tec.com>
Thanks
James
> ---
> arch/arc/include/asm/sections.h | 1 -
> arch/arc/kernel/setup.c | 2 +-
> arch/metag/kernel/setup.c | 6 +-----
> arch/mips/include/asm/mips-boards/generic.h | 4 ----
> arch/mips/lantiq/prom.h | 2 --
> arch/mips/netlogic/xlp/dt.c | 4 ++--
> arch/mips/ralink/of.c | 2 --
> arch/openrisc/kernel/setup.c | 2 +-
> arch/openrisc/kernel/vmlinux.h | 2 --
> arch/xtensa/kernel/setup.c | 3 +--
> include/linux/of_fdt.h | 3 +++
> 11 files changed, 9 insertions(+), 22 deletions(-)
>
> diff --git a/arch/arc/include/asm/sections.h b/arch/arc/include/asm/sections.h
> index 764f1e3ba752..09db952e14bd 100644
> --- a/arch/arc/include/asm/sections.h
> +++ b/arch/arc/include/asm/sections.h
> @@ -12,6 +12,5 @@
> #include <asm-generic/sections.h>
>
> extern char __arc_dccm_base[];
> -extern char __dtb_start[];
>
> #endif
> diff --git a/arch/arc/kernel/setup.c b/arch/arc/kernel/setup.c
> index 643eae4436e0..ef705d0f50f5 100644
> --- a/arch/arc/kernel/setup.c
> +++ b/arch/arc/kernel/setup.c
> @@ -314,7 +314,7 @@ void setup_processor(void)
> void __init setup_arch(char **cmdline_p)
> {
> /* This also populates @boot_command_line from /bootargs */
> - machine_desc = setup_machine_fdt(__dtb_start);
> + machine_desc = setup_machine_fdt(&__dtb_start);
> if (!machine_desc)
> panic("Embedded DT invalid\n");
>
> diff --git a/arch/metag/kernel/setup.c b/arch/metag/kernel/setup.c
> index 129c7cdda1ce..919c782f5479 100644
> --- a/arch/metag/kernel/setup.c
> +++ b/arch/metag/kernel/setup.c
> @@ -105,10 +105,6 @@
>
> extern char _heap_start[];
>
> -#ifdef CONFIG_METAG_BUILTIN_DTB
> -extern u32 __dtb_start[];
> -#endif
> -
> #ifdef CONFIG_DA_CONSOLE
> /* Our early channel based console driver */
> extern struct console dash_console;
> @@ -251,7 +247,7 @@ void __init setup_arch(char **cmdline_p)
> if (!machine_desc) {
> #ifdef CONFIG_METAG_BUILTIN_DTB
> /* try the embedded device tree */
> - machine_desc = setup_machine_fdt(__dtb_start);
> + machine_desc = setup_machine_fdt(&__dtb_start);
> if (!machine_desc)
> panic("Invalid embedded device tree.");
> #else
> diff --git a/arch/mips/include/asm/mips-boards/generic.h b/arch/mips/include/asm/mips-boards/generic.h
> index 48616816bcbc..c904c24550f6 100644
> --- a/arch/mips/include/asm/mips-boards/generic.h
> +++ b/arch/mips/include/asm/mips-boards/generic.h
> @@ -67,10 +67,6 @@
>
> extern int mips_revision_sconid;
>
> -#ifdef CONFIG_OF
> -extern struct boot_param_header __dtb_start;
> -#endif
> -
> #ifdef CONFIG_PCI
> extern void mips_pcibios_init(void);
> #else
> diff --git a/arch/mips/lantiq/prom.h b/arch/mips/lantiq/prom.h
> index 8e07b5f28ef1..bfd2d58c1d69 100644
> --- a/arch/mips/lantiq/prom.h
> +++ b/arch/mips/lantiq/prom.h
> @@ -26,6 +26,4 @@ struct ltq_soc_info {
> extern void ltq_soc_detect(struct ltq_soc_info *i);
> extern void ltq_soc_init(void);
>
> -extern struct boot_param_header __dtb_start;
> -
> #endif
> diff --git a/arch/mips/netlogic/xlp/dt.c b/arch/mips/netlogic/xlp/dt.c
> index 8316d5454b17..87250f378386 100644
> --- a/arch/mips/netlogic/xlp/dt.c
> +++ b/arch/mips/netlogic/xlp/dt.c
> @@ -42,7 +42,7 @@
> #include <asm/prom.h>
>
> extern u32 __dtb_xlp_evp_begin[], __dtb_xlp_svp_begin[],
> - __dtb_xlp_fvp_begin[], __dtb_start[];
> + __dtb_xlp_fvp_begin[];
> static void *xlp_fdt_blob;
>
> void __init *xlp_dt_init(void *fdtp)
> @@ -66,7 +66,7 @@ void __init *xlp_dt_init(void *fdtp)
> #endif
> default:
> /* Pick a built-in if any, and hope for the best */
> - fdtp = __dtb_start;
> + fdtp = &__dtb_start;
> break;
> }
> }
> diff --git a/arch/mips/ralink/of.c b/arch/mips/ralink/of.c
> index eccc5526155e..615603bd8063 100644
> --- a/arch/mips/ralink/of.c
> +++ b/arch/mips/ralink/of.c
> @@ -28,8 +28,6 @@
> __iomem void *rt_sysc_membase;
> __iomem void *rt_memc_membase;
>
> -extern struct boot_param_header __dtb_start;
> -
> __iomem void *plat_of_remap_node(const char *node)
> {
> struct resource res;
> diff --git a/arch/openrisc/kernel/setup.c b/arch/openrisc/kernel/setup.c
> index 4fc7ccc0a2cf..c9b880d64bb8 100644
> --- a/arch/openrisc/kernel/setup.c
> +++ b/arch/openrisc/kernel/setup.c
> @@ -213,7 +213,7 @@ void __init or32_early_setup(void *fdt)
> if (fdt)
> pr_info("FDT at %p\n", fdt);
> else {
> - fdt = __dtb_start;
> + fdt = &__dtb_start;
> pr_info("Compiled-in FDT at %p\n", fdt);
> }
> early_init_devtree(fdt);
> diff --git a/arch/openrisc/kernel/vmlinux.h b/arch/openrisc/kernel/vmlinux.h
> index 70b9ce41835c..bbcdf21b0b35 100644
> --- a/arch/openrisc/kernel/vmlinux.h
> +++ b/arch/openrisc/kernel/vmlinux.h
> @@ -5,6 +5,4 @@
> extern char __initrd_start, __initrd_end;
> #endif
>
> -extern u32 __dtb_start[];
> -
> #endif
> diff --git a/arch/xtensa/kernel/setup.c b/arch/xtensa/kernel/setup.c
> index 6e2b6638122d..d96cf8f3fe70 100644
> --- a/arch/xtensa/kernel/setup.c
> +++ b/arch/xtensa/kernel/setup.c
> @@ -68,8 +68,7 @@ extern int initrd_below_start_ok;
> #endif
>
> #ifdef CONFIG_OF
> -extern u32 __dtb_start[];
> -void *dtb_start = __dtb_start;
> +void *dtb_start = &__dtb_start;
> #endif
>
> unsigned char aux_device_present;
> diff --git a/include/linux/of_fdt.h b/include/linux/of_fdt.h
> index 0beaee9dac1f..aabc49f3e403 100644
> --- a/include/linux/of_fdt.h
> +++ b/include/linux/of_fdt.h
> @@ -57,6 +57,9 @@ struct boot_param_header {
> __be32 dt_struct_size; /* size of the DT structure block */
> };
>
> +/* For kernels with a built-in device tree */
> +extern struct boot_param_header __dtb_start;
> +
> #if defined(CONFIG_OF_FLATTREE)
>
> struct device_node;
>
--
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