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X-BeenThere: linux-nvme@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "Linux-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org On 9/10/24 8:01 AM, Kanchan Joshi wrote: > diff --git a/include/linux/rw_hint.h b/include/linux/rw_hint.h > index b9942f5f13d3..ff708a75e2f6 100644 > --- a/include/linux/rw_hint.h > +++ b/include/linux/rw_hint.h > @@ -21,4 +21,17 @@ enum rw_lifetime_hint { > static_assert(sizeof(enum rw_lifetime_hint) == 1); > #endif > > +#define WRITE_HINT_TYPE_BIT BIT(7) > +#define WRITE_HINT_VAL_MASK (WRITE_HINT_TYPE_BIT - 1) > +#define WRITE_HINT_TYPE(h) (((h) & WRITE_HINT_TYPE_BIT) ? \ > + TYPE_RW_PLACEMENT_HINT : TYPE_RW_LIFETIME_HINT) > +#define WRITE_HINT_VAL(h) ((h) & WRITE_HINT_VAL_MASK) > + > +#define WRITE_PLACEMENT_HINT(h) (((h) & WRITE_HINT_TYPE_BIT) ? \ > + WRITE_HINT_VAL(h) : 0) > +#define WRITE_LIFETIME_HINT(h) (((h) & WRITE_HINT_TYPE_BIT) ? \ > + 0 : WRITE_HINT_VAL(h)) > + > +#define PLACEMENT_HINT_TYPE WRITE_HINT_TYPE_BIT > +#define MAX_PLACEMENT_HINT_VAL (WRITE_HINT_VAL_MASK - 1) > #endif /* _LINUX_RW_HINT_H */ The above macros implement a union of two 7-bit types in an 8-bit field. Wouldn't we be better of by using two separate 8-bit values such that we don't need the above macros? Thanks, Bart.