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SubjectRe: x86/non-x86: percpu, node ids, apic ids x86.git fixup
On Wed, 30 Jan 2008, Linux Kernel Mailing List wrote:
> Gitweb: http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=dd5af90a7f3d79e04b7eace9a98644dbf2038f4d
> Commit: dd5af90a7f3d79e04b7eace9a98644dbf2038f4d
> Parent: 3212bff370c2f22e4987c6679ba485654cefb178
> Author: Mike Travis <travis@sgi.com>
> AuthorDate: Wed Jan 30 13:33:32 2008 +0100
> Committer: Ingo Molnar <mingo@elte.hu>
> CommitDate: Wed Jan 30 13:33:32 2008 +0100
>
> x86/non-x86: percpu, node ids, apic ids x86.git fixup
>
> Signed-off-by: Ingo Molnar <mingo@elte.hu>
> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
> ---
> arch/x86/Kconfig | 2 +-
> include/asm-generic/percpu.h | 12 ++----------
> init/main.c | 4 ++--
> kernel/module.c | 8 ++++++++

This broke powerpc (and presumably ia64 and sparc64) in current linux-2.6.git:

| init/main.c:376: error: static declaration of 'setup_per_cpu_areas' follows non-static declaration
| include2/asm/percpu.h:33: error: previous declaration of 'setup_per_cpu_areas' was here

as the generic and x86-specific parts were integrated, while the
powerpc/ia64/sparc64-specific parts are still missing.

> 4 files changed, 13 insertions(+), 13 deletions(-)
>
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index f0887d1..8e1b33c 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -97,7 +97,7 @@ config GENERIC_TIME_VSYSCALL
> bool
> default X86_64
>
> -config ARCH_SETS_UP_PER_CPU_AREA
> +config HAVE_SETUP_PER_CPU_AREA
> def_bool X86_64
>
> config ARCH_SUPPORTS_OPROFILE
> diff --git a/include/asm-generic/percpu.h b/include/asm-generic/percpu.h
> index c41b1a7..4b8d31c 100644
> --- a/include/asm-generic/percpu.h
> +++ b/include/asm-generic/percpu.h
> @@ -47,7 +47,7 @@ extern unsigned long __per_cpu_offset[NR_CPUS];
> #endif
>
> /*
> - * A percpu variable may point to a discarded reghions. The following are
> + * A percpu variable may point to a discarded regions. The following are
> * established ways to produce a usable pointer from the percpu variable
> * offset.
> */
> @@ -59,18 +59,10 @@ extern unsigned long __per_cpu_offset[NR_CPUS];
> (*SHIFT_PERCPU_PTR(&per_cpu_var(var), __my_cpu_offset))
>
>
> -#ifdef CONFIG_ARCH_SETS_UP_PER_CPU_AREA
> +#ifdef CONFIG_HAVE_SETUP_PER_CPU_AREA
> extern void setup_per_cpu_areas(void);
> #endif
>
> -/* A macro to avoid #include hell... */
> -#define percpu_modcopy(pcpudst, src, size) \
> -do { \
> - unsigned int __i; \
> - for_each_possible_cpu(__i) \
> - memcpy((pcpudst)+per_cpu_offset(__i), \
> - (src), (size)); \
> -} while (0)
> #else /* ! SMP */
>
> #define per_cpu(var, cpu) (*((void)(cpu), &per_cpu_var(var)))
> diff --git a/init/main.c b/init/main.c
> index 5843fe9..3316dff 100644
> --- a/init/main.c
> +++ b/init/main.c
> @@ -363,7 +363,7 @@ static inline void smp_prepare_cpus(unsigned int maxcpus) { }
>
> #else
>
> -#ifndef CONFIG_ARCH_SETS_UP_PER_CPU_AREA
> +#ifndef CONFIG_HAVE_SETUP_PER_CPU_AREA
> unsigned long __per_cpu_offset[NR_CPUS] __read_mostly;
>
> EXPORT_SYMBOL(__per_cpu_offset);
> @@ -384,7 +384,7 @@ static void __init setup_per_cpu_areas(void)
> ptr += size;
> }
> }
> -#endif /* CONFIG_ARCH_SETS_UP_CPU_AREA */
> +#endif /* CONFIG_HAVE_SETUP_PER_CPU_AREA */
>
> /* Called by boot processor to activate the rest. */
> static void __init smp_init(void)
> diff --git a/kernel/module.c b/kernel/module.c
> index f6a4e72..bd60278 100644
> --- a/kernel/module.c
> +++ b/kernel/module.c
> @@ -430,6 +430,14 @@ static unsigned int find_pcpusec(Elf_Ehdr *hdr,
> return find_sec(hdr, sechdrs, secstrings, ".data.percpu");
> }
>
> +static void percpu_modcopy(void *pcpudest, const void *from, unsigned long size)
> +{
> + int cpu;
> +
> + for_each_possible_cpu(cpu)
> + memcpy(pcpudest + per_cpu_offset(cpu), from, size);
> +}
> +
> static int percpu_modinit(void)
> {
> pcpu_num_used = 2;
> -
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>

With kind regards,

Geert Uytterhoeven
Software Architect

Sony Network and Software Technology Center Europe
The Corporate Village · Da Vincilaan 7-D1 · B-1935 Zaventem · Belgium

Phone: +32 (0)2 700 8453
Fax: +32 (0)2 700 8622
E-mail: Geert.Uytterhoeven@sonycom.com
Internet: http://www.sony-europe.com/

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