[PATCH v4 5/5] kexec: document -s, -c and -a options.

[Michal Suchanek]

Signed-off-by: Michal Suchanek <msuchanek at suse.de>
---
 kexec/kexec.8 | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/kexec/kexec.8 b/kexec/kexec.8
index e0131b4ea827..b3543db3f413 100644
--- a/kexec/kexec.8
+++ b/kexec/kexec.8
@@ -144,6 +144,21 @@ Load the new kernel for use on panic.
 Specify that the new kernel is of this
 .I type.
 .TP
+.BI \-s\ (\-\-kexec-file-syscall)
+Specify that the new KEXEC_FILE_LOAD syscall should be used exclusively.
+.TP
+.BI \-c\ (\-\-kexec-syscall)
+Specify that the old KEXEC_LOAD syscall should be used exclusively (the default).
+.TP
+.BI \-a\ (\-\-kexec-syscall-auto)
+Try the new simpler KEXEC_FILE_LOAD syscall first and if it is not supported
+fall back to the old KEXEC_LOAD interface.
+
+There is no one single interface that always works. KEXEC_FILE_LOAD is required
+on systems that use locked-down secure boot to verify the kernel signature.
+KEXEC_LOAD is required for some kernel image formats and on architectures that
+do not support KEXEC_FILE_LOAD.
+.TP
 .B \-u\ (\-\-unload)
 Unload the current
 .B kexec
-- 
2.13.6