Le jeudi 24 mars 2011 Ã 14:51 -0500, Christoph Lameter a Ãcrit : > On Thu, 24 Mar 2011, Pekka Enberg wrote: > > > Thanks, Ingo! Christoph, may I have your sign-off for the patch and > > I'll send it to Linus? > > > Subject: SLUB: Write to per cpu data when allocating it > > It turns out that the cmpxchg16b emulation has to access vmalloced > percpu memory with interrupts disabled. If the memory has never > been touched before then the fault necessary to establish the > mapping will not to occur and the kernel will fail on boot. > > Fix that by reusing the CONFIG_PREEMPT code that writes the > cpu number into a field on every cpu. Writing to the per cpu > area before causes the mapping to be established before we get > to a cmpxchg16b emulation. > Thats strange, alloc_percpu() is supposed to zero the memory already ... Are you sure its really this problem of interrupts being disabled ? -- 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/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>