On Thu, 10 Oct 2013, Kirill A. Shutemov wrote:
> Christoph Lameter wrote:
> > 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?
>
> No. We will have to track what affects sizeof(spinlock_t) manually.
> Not a fun and error prune.
You can generate a config option depending on the size of the object via
Kbuild. Kbuild will determine the setting before building the kernel as a
whole by runing some small C program.
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