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Date: Wed, 30 Jan 2008 08:02:18 -0800
From: Mike Travis <travis@....com>
To: Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.com>
CC: Linus Torvalds <torvalds@...ux-foundation.org>,
Ingo Molnar <mingo@...e.hu>,
Thomas Gleixner <tglx@...utronix.de>,
Linux Kernel Development <linux-kernel@...r.kernel.org>,
Linux/PPC Development <linuxppc-dev@...abs.org>,
linux-ia64@...r.kernel.org, sparclinux@...r.kernel.org
Subject: Re: x86/non-x86: percpu, node ids, apic ids x86.git fixup
Geert Uytterhoeven wrote:
> 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@....com>
>> AuthorDate: Wed Jan 30 13:33:32 2008 +0100
>> Committer: Ingo Molnar <mingo@...e.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@...e.hu>
>> Signed-off-by: Thomas Gleixner <tglx@...utronix.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:
I'm generating a "fixup patch" right now...
-Mike
>
> | 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
>
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> E-mail: Geert.Uytterhoeven@...ycom.com
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>
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