if hmm_range_get_pages returns EBUSY error during
svm_range_validate_and_map, within the context of a page fault
interrupt. This should retry through svm_range_restore_pages
callback. Therefore we treat this as EAGAIN error instead, and defer
it to restore pages fallback.
Signed-off-by: Alex Sierra <alex.sierra@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
WRITE_ONCE(p->svms.faulting_task, NULL);
if (r) {
pr_debug("failed %d to get svm range pages\n", r);
+ if (r == -EBUSY)
+ r = -EAGAIN;
goto unreserve_out;
}