bitops for handling 32 bits
Hi all, Is there a kernel API for handling 32 bits ? I see a macro like BIT(nr) http://lxr.free-electrons.com/source/include/linux/bitops.h#L6 #define BIT(nr) (1UL (nr)) and also #define BIT_ULL(nr) (1ULL (nr)) However, these macros are using 64 bit semantics, so if I will use them with 32 bits values the results will be wrong. Any ideas ? Regards, Kevin ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: bitops for handling 32 bits
On Tue 28 Jul, 2015 20:24 Kevin Wilson wkev...@gmail.com wrote: Hi all, Is there a kernel API for handling 32 bits ? I see a macro like BIT(nr) http://lxr.free-electrons.com/source/include/linux/bitops.h#L6 #define BIT(nr) (1UL (nr)) and also #define BIT_ULL(nr) (1ULL (nr)) However, these macros are using 64 bit semantics, so if I will use them with 32 bits values the results will be wrong. Any ideas ? Regards, Kevin ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies The macros don't do type checking so it will work for both 32-bit and 64-bit. ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: bitops for handling 32 bits
On Jul 28, 2015, at 10:46 PM, Kevin Wilson wkev...@gmail.com wrote: Hi all, Is there a kernel API for handling 32 bits ? I see a macro like BIT(nr) http://lxr.free-electrons.com/source/include/linux/bitops.h#L6 #define BIT(nr) (1UL (nr)) and also #define BIT_ULL(nr) (1ULL (nr)) However, these macros are using 64 bit semantics, so if I will use them with 32 bits values the results will be wrong. Did you try using it? The code is generic. Any ideas ? Regards, Kevin ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
