locking, m68k: Calculate thread_info offset with asm offset
m68k has the thread_info structure embedded in its task struct. Therefore its not possible to implement current_thread_info() by looking at the stack pointer and do some simple calculations like most other architectures do it. To return the thread_info pointer for a task two defines are used. This works until the spinlock function bodies get moved into an own header file and CONFIG_SPINLOCK_DEBUG is turned on. That results into this compile error: In file included from include/linux/spinlock.h:378, from include/linux/seqlock.h:29, from include/linux/time.h:8, from include/linux/timex.h:56, from include/linux/sched.h:54, from arch/m68k/kernel/asm-offsets.c:12: include/linux/spinlock_api_smp.h: In function '__spin_unlock_irq': include/linux/spinlock_api_smp.h:371: error: 'current' undeclared (first use in this function) include/linux/spinlock_api_smp.h:371: error: (Each undeclared identifier is reported only once include/linux/spinlock_api_smp.h:371: error: for each function it appears in.) Including asm/current.h to asm-offsets.c wouldn't help since the definition of struct task is needed. So we end up with ugly header file include dependencies. To solve this calculate the offset of the thread_info structure into the task struct in asm-offsets.h and use the offset in task_thread_info(). This works just like it does for IA64 as well. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Nick Piggin <nickpiggin@yahoo.com.au> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Horst Hartmann <horsth@linux.vnet.ibm.com> Cc: Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: David Miller <davem@davemloft.net> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Roman Zippel <zippel@linux-m68k.org> Cc: <linux-arch@vger.kernel.org> LKML-Reference: <20090831124417.329662275@de.ibm.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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@ -1,6 +1,10 @@
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#ifndef _ASM_M68K_THREAD_INFO_H
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#define _ASM_M68K_THREAD_INFO_H
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#ifndef ASM_OFFSETS_C
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#include <asm/asm-offsets.h>
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#endif
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#include <asm/current.h>
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#include <asm/types.h>
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#include <asm/page.h>
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@ -31,7 +35,12 @@ struct thread_info {
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#define init_thread_info (init_task.thread.info)
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#define init_stack (init_thread_union.stack)
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#define task_thread_info(tsk) (&(tsk)->thread.info)
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#ifdef ASM_OFFSETS_C
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#define task_thread_info(tsk) ((struct thread_info *) NULL)
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#else
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#define task_thread_info(tsk) ((struct thread_info *)((char *)tsk+TASK_TINFO))
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#endif
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#define task_stack_page(tsk) ((tsk)->stack)
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#define current_thread_info() task_thread_info(current)
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@ -8,6 +8,8 @@
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* #defines from the assembly-language output.
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*/
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#define ASM_OFFSETS_C
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#include <linux/stddef.h>
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#include <linux/sched.h>
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#include <linux/kernel_stat.h>
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@ -27,6 +29,9 @@ int main(void)
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DEFINE(TASK_INFO, offsetof(struct task_struct, thread.info));
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DEFINE(TASK_MM, offsetof(struct task_struct, mm));
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DEFINE(TASK_ACTIVE_MM, offsetof(struct task_struct, active_mm));
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#ifdef CONFIG_MMU
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DEFINE(TASK_TINFO, offsetof(struct task_struct, thread.info));
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#endif
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/* offsets into the thread struct */
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DEFINE(THREAD_KSP, offsetof(struct thread_struct, ksp));
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