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| author | Ingo Molnar <mingo@elte.hu> | 2008-01-30 23:27:58 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-01-30 23:27:58 +0100 |
| commit | ab6e14b712e2d8e0c4dd3cf1a72083b52104853a (patch) | |
| tree | 61482c08249c4cc242c4f18600be99177e137611 /include | |
| parent | 18fbef9e5242e146fe0264cf719a498785102841 (diff) | |
| download | linux-ab6e14b712e2d8e0c4dd3cf1a72083b52104853a.tar.gz linux-ab6e14b712e2d8e0c4dd3cf1a72083b52104853a.tar.bz2 linux-ab6e14b712e2d8e0c4dd3cf1a72083b52104853a.zip | |
ia64: on UP percpu variables are not small memory model
Tony says:
| The CONFIG_SMP=n path in ia64 makes quite radical changes ... rather
| than putting all the per-cpu stuff into the top 64K of address space
| and providing a per-cpu TLB mapping for that range to a different
| physical address ... it just makes all the per-cpu stuff link as ordinary
| variables in .data.
the new generic percpu code got confused about this as PER_CPU_ATTRIBUTES
was defined even on UP, so it picked up that small memory model - which
was not possible to get linked. The right fix is to only define that
on SMP. This resolved the build failures in my cross-compiling environment.
also link these variables into the .percpu section even on UP - some
assembly code has offset dependencies. (such as GET_IA64_MCA_DATA() in
arch/ia64/kernel/mca_asm.S)
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Acked-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/asm-ia64/percpu.h | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/include/asm-ia64/percpu.h b/include/asm-ia64/percpu.h index 26404b77f007..77f30b664b4e 100644 --- a/include/asm-ia64/percpu.h +++ b/include/asm-ia64/percpu.h @@ -15,18 +15,20 @@ #include <linux/threads.h> +#ifdef CONFIG_SMP + #ifdef HAVE_MODEL_SMALL_ATTRIBUTE # define PER_CPU_ATTRIBUTES __attribute__((__model__ (__small__))) #endif -#ifdef CONFIG_SMP - #define __my_cpu_offset __ia64_per_cpu_var(local_per_cpu_offset) extern void *per_cpu_init(void); #else /* ! SMP */ +#define PER_CPU_ATTRIBUTES __attribute__((__section__(".data.percpu"))) + #define per_cpu_init() (__phys_per_cpu_start) #endif /* SMP */ |