9b7dbc7dc0
Alpha implements custom SHIFT_PERCPU_PTR for modules because percpu area can be located far away from the 4G area where the module text is located. The custom SHIFT_PERCPU_PTR forces GOT usage using ldq instruction with literal relocation; however, the relocation can't be used with dynamically allocated percpu variables. Fortunately, similar result can be achieved by using weak percpu variable definitions. This patch makes alpha use weak definitions and switch to dynamic percpu allocator. asm/tlbflush.h was getting linux/sched.h via asm/percpu.h which no longer needs it. Include linux/sched.h directly in asm/tlbflush.h. Compile tested. Generation of litereal relocation verified. This patch is based on Ivan Kokshaysky's alpha percpu patch. [ Impact: use dynamic percpu allocator ] Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: Richard Henderson <rth@twiddle.net>
19 lines
488 B
C
19 lines
488 B
C
#ifndef __ALPHA_PERCPU_H
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#define __ALPHA_PERCPU_H
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/*
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* To calculate addresses of locally defined variables, GCC uses
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* 32-bit displacement from the GP. Which doesn't work for per cpu
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* variables in modules, as an offset to the kernel per cpu area is
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* way above 4G.
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*
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* Always use weak definitions for percpu variables in modules.
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*/
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#if defined(MODULE) && defined(CONFIG_SMP)
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#define ARCH_NEEDS_WEAK_PER_CPU
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#endif
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#include <asm-generic/percpu.h>
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#endif /* __ALPHA_PERCPU_H */
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