[PATCH v3 3/3] doc/hotplug: update man and --help

[Sourabh Jain <sourabhjain@linux.ibm.com>]

Update the man page and --help option to make the description of the
--hotplug option easier to understand.

Cc: Aditya Gupta <adityag@linux.ibm.com>
Cc: Baoquan He <bhe@redhat.com>
Cc: Coiby Xu <coxu@redhat.com>
Cc: Mahesh Salgaonkar <mahesh@linux.ibm.com>
Cc: Simon Horman <horms@kernel.org>
Acked-by: Hari Bathini <hbathini@linux.ibm.com>
Signed-off-by: Sourabh Jain <sourabhjain@linux.ibm.com>
---
Changelog:

From v2 -> v3
  - Updated --hotplug option description

---
 kexec/kexec.8 | 8 ++++----
 kexec/kexec.c | 4 +++-
 2 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/kexec/kexec.8 b/kexec/kexec.8
index 9e995fe..793e876 100644
--- a/kexec/kexec.8
+++ b/kexec/kexec.8
@@ -140,10 +140,10 @@ Open a help file for
 .BR kexec .
 .TP
 .B \-\-hotplug
-Setup for kernel modification of the elfcorehdr. This option performs
-the steps needed to support kernel updates to the elfcorehdr in the
-presence of hot un/plug and/or on/offline events. This option only
-useful for KEXEC_LOAD syscall.
+Setup kexec segments such that kernel can safely update them on CPU/Memory
+hot add/remove events. If this option is enabled, kernel does in-kernel
+update of kexec segments on CPU/Memory hot add/remove events, thus avoiding
+the need to reload kdump kernel.
 .TP
 .B \-i\ (\-\-no-checks)
 Fast reboot, no memory integrity checks.
diff --git a/kexec/kexec.c b/kexec/kexec.c
index 034cea6..9b7c34c 100644
--- a/kexec/kexec.c
+++ b/kexec/kexec.c
@@ -1093,7 +1093,9 @@ void usage(void)
 	       "                      back to the compatibility syscall when file based\n"
 	       "                      syscall is not supported or the kernel did not\n"
 	       "                      understand the image (default)\n"
-	       " --hotplug            Setup for kernel modification of elfcorehdr.\n"
+	       " --hotplug            Do in-kernel update of kexec segments on CPU/Memory\n"
+	       "                      hot add/remove events, avoiding the need to reload\n"
+	       "                      kdump kernel on online/offline events.\n"
 	       " -d, --debug          Enable debugging to help spot a failure.\n"
 	       " -S, --status         Return 1 if the type (by default crash) is loaded,\n"
 	       "                      0 if not.\n"
-- 
2.45.1


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