Hello. Arjan van de Ven wrote: > > The above code works if I use malloc(3). > > Is passing 'statically' allocated stack memory to clone(2) illegal? > > Stacks need a minimum level of alignment in memory; the alignment is > different on different systems (on x86 it's 16 bytes in practice to be > reliable, but 4 will already appear to work until you do fancy things). > I don't know what ARM has, but I'd not be surprised if it's more than 4 > as well. > The code you pasted will at best only do a 4 byte alignment..... so it's > even broken on x86 in subtle ways :) Great! I tested the following cases on ARM. "static char stack[1024];" failed. "static char stack[1024] __attribute__((aligned(2)));" also failed. "static char stack[1024] __attribute__((aligned(4)));" didn't fail. But anyway, I should use malloc(3) to let it handle alignment. I hope this alignment requirement be added to manpage of clone(2). Thank you. (Sorry for sending twice, previous attempt failed due to PSBL.) -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
