Messages in this thread | | | Subject | Re: sparse -Wptr-subtraction-blows: still needed? | From | Andi Kleen <> | Date | 02 May 2007 15:03:59 +0200 |
| |
Dave Jones <davej@redhat.com> writes: > > #define __page_to_pfn(page) ((unsigned long)((page) - mem_map) + \ > ARCH_PFN_OFFSET) > > looks like the other two variants of __page_to_pfn also use similar arithmatic.
No way around this. The only way to turn a page into a pfn is to do a constant division. Should be fairly cheap here though.
-Andi (who thinks the sparse warning is dumb; better to look at oprofiles of hot paths) - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |