ab6e14b712
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>
51 lines
1.3 KiB
C
51 lines
1.3 KiB
C
#ifndef _ASM_IA64_PERCPU_H
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#define _ASM_IA64_PERCPU_H
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/*
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* Copyright (C) 2002-2003 Hewlett-Packard Co
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* David Mosberger-Tang <davidm@hpl.hp.com>
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*/
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#define PERCPU_ENOUGH_ROOM PERCPU_PAGE_SIZE
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#ifdef __ASSEMBLY__
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# define THIS_CPU(var) (per_cpu__##var) /* use this to mark accesses to per-CPU variables... */
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#else /* !__ASSEMBLY__ */
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#include <linux/threads.h>
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#ifdef CONFIG_SMP
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#ifdef HAVE_MODEL_SMALL_ATTRIBUTE
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# define PER_CPU_ATTRIBUTES __attribute__((__model__ (__small__)))
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#endif
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#define __my_cpu_offset __ia64_per_cpu_var(local_per_cpu_offset)
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extern void *per_cpu_init(void);
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#else /* ! SMP */
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#define PER_CPU_ATTRIBUTES __attribute__((__section__(".data.percpu")))
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#define per_cpu_init() (__phys_per_cpu_start)
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#endif /* SMP */
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/*
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* Be extremely careful when taking the address of this variable! Due to virtual
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* remapping, it is different from the canonical address returned by __get_cpu_var(var)!
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* On the positive side, using __ia64_per_cpu_var() instead of __get_cpu_var() is slightly
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* more efficient.
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*/
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#define __ia64_per_cpu_var(var) per_cpu__##var
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#include <asm-generic/percpu.h>
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/* Equal to __per_cpu_offset[smp_processor_id()], but faster to access: */
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DECLARE_PER_CPU(unsigned long, local_per_cpu_offset);
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#endif /* !__ASSEMBLY__ */
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#endif /* _ASM_IA64_PERCPU_H */
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