On Thu, 10 Oct 2013, Kirill A. Shutemov wrote:
> +static inline bool ptlock_alloc(struct page *page)
> +{
> + if (sizeof(spinlock_t) > sizeof(page->ptl))
> + return __ptlock_alloc(page);
> + return true;
> +}
Could you make the check a CONFIG option?
CONFIG_PTLOCK_DOES_NOT_FIT_IN_PAGE_STRUCT or
so?
> --- a/include/linux/mm_types.h
> +++ b/include/linux/mm_types.h
> @@ -147,7 +147,10 @@ struct page {
> * system if PG_buddy is set.
> */
> #if USE_SPLIT_PTE_PTLOCKS
> - spinlock_t ptl;
> + unsigned long ptl; /* It's spinlock_t if it fits to long,
> + * otherwise it's pointer to dynamicaly
> + * allocated spinlock_t.
> + */
If you had such a CONFIG option then you could use the proper type here.
#ifdef CONFIG_PTLOCK_NOT_FITTING
spinlock_t *ptl;
#else
spinlock_t ptl;
#endif
Or some such thing?
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