What were you trying to do that didn't work?

Tested on RHEL-10.2-20251008.0+kdump-utils-1.0.58-1.el10,run 'kdumpctl reset-crashkernel':
(1). please print out some info like 'no need update crashkernel value' if no change the crashkernel value, currently it print nothing.

# rpm -q kdump-utils
kdump-utils-1.0.58-1.el10.ppc64le

# kdumpctl showmem 
kdump: Reserved 384MB memory for crash kernel

# kdumpctl reset-crashkernel

(2). When memory less than 2G,

• it should print the word 'Warning:' at the beginning of the sentence
• it should not print ' Please reboot the system for the change to take effect.'. This sentence is easy to be misunderstood.

  # kdumpctl showmem
  kdump: Reserved 0MB memory for crash kernel
  
  # kdumpctl status 
  kdump: Kdump is not operational
  kdump: Notice: No vmcore creation test performed!
  
  # cat /proc/cmdline 
  BOOT_IMAGE=(hd0,gpt2)/vmlinuz-6.12.0-138.el10.x86_64 root=/dev/mapper/rhel_dell--per740xd--01-root ro crashkernel=2G-64G:256M,64G-:512M resume=UUID=6d7ee881-b538-4232-b73e-42a7469d6d63 rd.lvm.lv=rhel_dell-per740xd-01/root rd.lvm.lv=rhel_dell-per740xd-01/swap console=ttyS0,115200n81 mem=2000M
  
  # kdumpctl reset-crashkernel
  
  # grubby --update-kernel=/boot/vmlinuz-`uname -r` --args="crashkernel=256M"
  # reboot
  # kdumpctl showmem
  kdump: Reserved 256MB memory for crash kernel
  
  # kdumpctl reset-crashkernel
  kdump: No memory will be reserved for crash kernel for this system because the system memory is smaller than the requirement. kdump requires more than 2GB memory.
  kdump: Updated crashkernel=2G-64G:256M,64G-:512M for kernel=/boot/vmlinuz-6.12.0-138.el10.x86_64, grub entry index=0. Please reboot the system for the change to take effect.
  

Please provide the package NVR for which the bug is seen:

RHEL-10.2-20251008.0
kernel-6.12.0-138.el10
kexec-tools-2.0.31-1.el10
kdump-utils-1.0.58-1.el10

How reproducible is this bug?:

always

Steps to reproduce

1. Expected results

Actual results