On Tue, Apr 22, 2014 at 12:35:22PM -0300, Ezequiel Garcia wrote: > On Apr 22, Tobias Klauser wrote: > > On 2014-04-22 at 16:24:43 +0200, Ezequiel Garcia <ezequiel.garcia@xxxxxxxxxxxxxxxxxx> wrote: > > > Hi Ley Foon, > > > > > > On Apr 18, Ley Foon Tan wrote: > > > > +/* > > > > + * PAGE_SHIFT determines the page size > > > > + */ > > > > +#define PAGE_SHIFT 12 > > > > +#define PAGE_SIZE 4096 > > > > +#define PAGE_MASK (~(PAGE_SIZE - 1)) > > > > + > > > > > > How about something like this: > > > > > > /* PAGE_SHIFT determines the page size */ > > > #define PAGE_SHIFT 12 > > > #define PAGE_SIZE (_AC(1,UL) << PAGE_SHIFT) > > > #define PAGE_MASK (~((1 << PAGE_SHIFT) - 1)) > > > > > > Otherwise, the PAGE_SIZE macro above produces some warnings, IIRC. > > > > AFAIR old nios2 GCC versions (the 4.1 version from Windriver, IIRC) > > would complain about something like the above, that's the reason I added > > an explicit value for PAGE_SIZE back then. > > > > Other than being "pretty" the above fix is to remove a mismatch type > warning. You can get rid of the warning in different ways: > > ifdef __ASSEMBLY__ > define PAGE_SIZE 4096 > else > define PAGE_SIZE 4096UL > endif The usual way to do this is as follows: #include <linux/const.h> #define PAGE_SHIFT 12 #define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT) #define PAGE_MASK (~(PAGE_SIZE-1)) _AC(1, UL) expands to 1 for assembler and 1UL for C code. This is also what was suggested above. Please follow this scheme for nios2 too. Sam -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
