On 09/18/2012 07:06 PM, Christoph Lameter wrote: > On Tue, 18 Sep 2012, Glauber Costa wrote: > >> +++ b/include/linux/gfp.h >> @@ -35,6 +35,11 @@ struct vm_area_struct; >> #else >> #define ___GFP_NOTRACK 0 >> #endif >> +#ifdef CONFIG_MEMCG_KMEM >> +#define ___GFP_KMEMCG 0x400000u >> +#else >> +#define ___GFP_KMEMCG 0 >> +#endif > > Could you leave __GFP_MEMCG a simple definition and then define GFP_MEMCG > to be zer0 if !MEMCG_KMEM? I think that would be cleaner and the > __GFP_KMEMCHECK another case that would be good to fix up. > > > I can, but what does this buy us? Also, in any case, this can be done incrementally, and for the other flag as well, as you describe.
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