On Sat, Apr 13, 2019 at 01:22:58PM -0400, Waiman Long wrote: > +#ifdef CONFIG_X86_64 > +#define RWSEM_MERGE_OWNER_TO_COUNT > +#endif
> +#ifdef RWSEM_MERGE_OWNER_TO_COUNT > + > +#ifdef __PHYSICAL_MASK_SHIFT > +#define RWSEM_PA_MASK_SHIFT __PHYSICAL_MASK_SHIFT > +#else > +#define RWSEM_PA_MASK_SHIFT 52 > +#endif I really dislike how this hardcodes x86_64. It would be much better to have a CONFIG variable that gives us the PA_BITS. Then all an architecture needs to do is set that right. FWIW: arch/arm64/Kconfig:config ARM64_PA_BITS_48 arch/arm64/Kconfig:config ARM64_PA_BITS_52 So ARM64 could also use this -- provided we get that overflow thing sorted.
