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[PATCH] powerpc: Don't use kmalloc() for kernel stacks
In readiness for 64k pages, when THREAD_SIZE will be less than PAGE_SIZE, ppc64 uses kmalloc() rather than __get_free_pages() to allocate kernel stacks, and since thread_info.h was merged, so does ppc32. However that adds some overhead which we don't really want when PAGE_SIZE <= THREAD_SIZE (including all ppc32 machines), so this patch avoids it. Signed-off-by: David Gibson <dwg@au1.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
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1 changed files with 17 additions and 10 deletions
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@ -66,19 +66,26 @@ struct thread_info {
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/* thread information allocation */
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/* thread information allocation */
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#ifdef CONFIG_DEBUG_STACK_USAGE
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#ifdef CONFIG_DEBUG_STACK_USAGE
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#define alloc_thread_info(tsk) \
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#define THREAD_INFO_GFP GFP_KERNEL | __GFP_ZERO
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({ \
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struct thread_info *ret; \
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\
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ret = kmalloc(THREAD_SIZE, GFP_KERNEL); \
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if (ret) \
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memset(ret, 0, THREAD_SIZE); \
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ret; \
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})
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#else
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#else
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#define alloc_thread_info(tsk) kmalloc(THREAD_SIZE, GFP_KERNEL)
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#define THREAD_INFO_GFP GFP_KERNEL
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#endif
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#endif
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#if THREAD_SHIFT >= PAGE_SHIFT
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#define THREAD_ORDER (THREAD_SHIFT - PAGE_SHIFT)
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#define alloc_thread_info(tsk) \
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((struct thread_info *)__get_free_pages(THREAD_INFO_GFP, THREAD_ORDER))
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#define free_thread_info(ti) free_pages((unsigned long)ti, THREAD_ORDER)
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#else /* THREAD_SHIFT < PAGE_SHIFT */
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#define alloc_thread_info(tsk) kmalloc(THREAD_SIZE, THREAD_INFO_GFP)
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#define free_thread_info(ti) kfree(ti)
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#define free_thread_info(ti) kfree(ti)
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#endif /* THREAD_SHIFT < PAGE_SHIFT */
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#define get_thread_info(ti) get_task_struct((ti)->task)
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#define get_thread_info(ti) get_task_struct((ti)->task)
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#define put_thread_info(ti) put_task_struct((ti)->task)
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#define put_thread_info(ti) put_task_struct((ti)->task)
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