On Thu, Oct 07, 2010 at 05:41:01PM +0900, Naoya Horiguchi wrote: > On Thu, Oct 07, 2010 at 09:38:48AM +0200, Andi Kleen wrote: > > On Thu, Oct 07, 2010 at 09:31:20AM +0900, Naoya Horiguchi wrote: > > > > @@ -198,7 +199,8 @@ static int kill_proc_ao(struct task_struct *t, unsigned long addr, int trapno, > > > > #ifdef __ARCH_SI_TRAPNO > > > > si.si_trapno = trapno; > > > > #endif > > > > - si.si_addr_lsb = PAGE_SHIFT; > > > > + order = PageCompound(page) ? huge_page_order(page) : PAGE_SHIFT; > > > ^^^^ > > > huge_page_order(page_hstate(page)) ? > > > > Ok. > > order seems to represent a least significant bit of corrupted address, > so is huge_page_order() + PAGE_SHIFT or huge_page_shift() correct? Both I guess. > And since @page can be a tail page, compound_head() is needed as Wu-san pointed out. > So huge_page_shift(page_hstate(compound_head(page))) looks good for me. I used compound_order(compound_head(page)) + PAGE_SHIFT now. This even works for non compound, so the special case check can be dropped. -Andi -- ak@xxxxxxxxxxxxxxx -- Speaking for myself only. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>