[PATCH 0/4] kdump: add parse_crashkernel_high_low() to replace parse_crashkernel_{high|low}()

[Zhen Lei]

The bootup command line option crashkernel=Y,low is valid only when
crashkernel=X,high is specified. Putting their parsing into a separate
function makes the code logic clearer and easier to understand the strong
dependencies between them. So add parse_crashkernel_high_low() and use it
to repalce parse_crashkernel_{high|low}(). Then make the latter static,
and reduce two confusing parameters 'system_ram' and 'crash_base' of them.

All four patches in this series do the cleanups, no functional change. This
patchset is also a preparation for supporting reserve crashkernel above 4G
on arm64, and share code with x86.

The main proposal was made by Borislav Petkov.
> As I've already alluded to in another mail, ontop of this there should
> be a patch or multiple patches which clean this up more and perhaps even
> split it into separate functions doing stuff in this order:
>
> 1. Parse all crashkernel= cmdline options
> 2. Do all crash_base, crash_size etc checks
> 3. Do the memory reservations
>
> And all that supplied with comments explaining why stuff is being done.


Zhen Lei (4):
  kdump: add helper parse_crashkernel_high_low()
  x86/setup: Use parse_crashkernel_high_low() to simplify code
  kdump: make parse_crashkernel_{high|low}() static
  kdump: reduce unnecessary parameters of parse_crashkernel_{high|low}()

 arch/x86/kernel/setup.c    | 21 +++++++--------
 include/linux/crash_core.h |  7 +++--
 kernel/crash_core.c        | 54 +++++++++++++++++++++++++++++++-------
 3 files changed, 56 insertions(+), 26 deletions(-)

-- 
2.25.1