diff options
| -rw-r--r-- | kernel/events/ring_buffer.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/kernel/events/ring_buffer.c b/kernel/events/ring_buffer.c index 5d3cf407e374..df2d8cf0072c 100644 --- a/kernel/events/ring_buffer.c +++ b/kernel/events/ring_buffer.c @@ -814,6 +814,13 @@ static void rb_free_work(struct work_struct *work) vfree(base); kfree(rb); + + /* + * FIXME: PAE workaround for vmalloc_fault(): Make sure buffer is + * unmapped in all page-tables. + */ + if (IS_ENABLED(CONFIG_X86_PAE)) + vmalloc_sync_all(); } void rb_free(struct ring_buffer *rb) @@ -840,6 +847,15 @@ struct ring_buffer *rb_alloc(int nr_pages, long watermark, int cpu, int flags) if (!all_buf) goto fail_all_buf; + /* + * FIXME: PAE workaround for vmalloc_fault(): The buffer is + * accessed in NMI handlers, make sure it is mapped in all + * page-tables in the system so that we don't fault on the range in + * an NMI handler. + */ + if (IS_ENABLED(CONFIG_X86_PAE)) + vmalloc_sync_all(); + rb->user_page = all_buf; rb->data_pages[0] = all_buf + PAGE_SIZE; if (nr_pages) { |