From: Nadav Amit <namit@xxxxxxxxxx> Describe the new UFFD_FEATURE_EXACT_ADDRESS API feature. Signed-off-by: Nadav Amit <namit@xxxxxxxxxx> --- man2/ioctl_userfaultfd.2 | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/man2/ioctl_userfaultfd.2 b/man2/ioctl_userfaultfd.2 index 504f61d4b..94480158e 100644 --- a/man2/ioctl_userfaultfd.2 +++ b/man2/ioctl_userfaultfd.2 @@ -214,6 +214,14 @@ memory accesses to the regions registered with userfaultfd. If this feature bit is set, .I uffd_msg.pagefault.feat.ptid will be set to the faulted thread ID for each page-fault message. +.TP +.BR UFFD_FEATURE_EXACT_ADDRESS " (since Linux 5.18)" +If this feature bit is set, +.I uffd_msg.pagefault.address +will be set to the exact page-fault address that was reported by the hardware, +and will not mask the offset within the page. +Note that old Linux versions might indicate the exact address as well, +even though the feature bit is not set. .PP The returned .I ioctls -- 2.25.1
