On 07/26/2012 12:51 PM, Jan Stancek wrote: > migrate_pages(2) can return also EFAULT and EINVAL errors. Applied. Thanks, Jan. Cheers, Michael > I encountered these errors while writing testcase for migrate_pages > syscall for LTP (Linux test project). > > I checked stable kernel tree 3.5 to see which paths return these. > Both can be returned from get_nodes(), which is called from: > SYSCALL_DEFINE4(migrate_pages, pid_t, pid, unsigned long, maxnode, > const unsigned long __user *, old_nodes, > const unsigned long __user *, new_nodes) > > The testcase does following: > EFAULT > a) old_nodes/new_nodes is area mmaped with PROT_NONE > b) old_nodes/new_nodes is area not mmapped in process address space, > -1 or area that has been just munmmaped > > EINVAL > a) maxnodes overflows kernel limit > b) new_nodes contain node, which has no memory or does not exist or is > not returned for get_mempolicy(MPOL_F_MEMS_ALLOWED). > > Signed-off-by: Jan Stancek <jstancek@xxxxxxxxxx> > --- > man2/migrate_pages.2 | 26 ++++++++++++++++++++++++++ > 1 files changed, 26 insertions(+), 0 deletions(-) > > diff --git a/man2/migrate_pages.2 b/man2/migrate_pages.2 > index 416a569..0493459 100644 > --- a/man2/migrate_pages.2 > +++ b/man2/migrate_pages.2 > @@ -106,6 +106,32 @@ to access the specified target nodes. > No process matching > .I pid > could be found. > +.TP > +.B EFAULT > +Part or all of the memory range specified by > +.I old_nodes > +/ > +.I new_nodes > +and > +.I maxnode > +points outside your accessible address space. > +.TP > +.B EINVAL > +The value specified by > +.I maxnode > +exceeds a kernel-imposed limit. > +.\" As at 3.5, this limit is "a page worth of bits", e.g., > +.\" 8 * 4096 bits, assuming a 4kB page size. > +Or, > +.I old_nodes > +/ > +.I new_nodes > +specifies one or more node IDs that are > +greater than the maximum supported node ID. > +Or, none of the node IDs specified by > +.I new_nodes > +are on-line and allowed by the process's current cpuset context, > +or none of the specified nodes contain memory. > .\" FIXME There are other errors > .SH VERSIONS > The > -- Michael Kerrisk Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/ Linux/UNIX System Programming Training: http://man7.org/training/ -- To unsubscribe from this list: send the line "unsubscribe linux-man" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
