Commit 0ab97169aa05 ("crash_core: add generic function to do
reservation") added a generic function to reserve crashkernel memory.
So let's use the same function on powerpc and remove the
architecture-specific code that essentially does the same thing.
The generic crashkernel reservation also provides a way to split the
crashkernel reservation into high and low memory reservations, which can
be enabled for powerpc in the future.
Additionally move powerpc to use generic APIs to locate memory hole for
kexec segments while loading kdump kernel.
Patch series summary:
=====================
Patch 1-3: generic changes
Patch 4-7: powerpc changes
Changelog:
v1:
https://lore.kernel.org/all/20241217064613.1042866-1-sourabhjain@xxxxxxxxxxxxx/
v1 Resend:
https://lore.kernel.org/all/20250108101458.406806-1-sourabhjain@xxxxxxxxxxxxx/
- Rebased on top of 6.13-rc6
v2:
https://lore.kernel.org/all/20250121115442.1278458-1-sourabhjain@xxxxxxxxxxxxx/
- 01/06 new patch, fixes a bug with ELF load address
It was posted in community as individual path but
since it align with this patch series so include here:
https://lore.kernel.org/all/20241210091314.185785-1-sourabhjain@xxxxxxxxxxxxx/
- Fixed a typo 06/06
- Added Acked-by and Reviewed-by tags
- Rebased it on 6.13
- It was suggested to try HAVE_ARCH_ADD_CRASH_RES_TO_IOMEM_EARLY and
see if 03/06 patch can be avoided:
https://lore.kernel.org/all/Z35gnO2N%2FLFt1E7E@MiWiFi-R3L-srv/
But after adding HAVE_ARCH_ADD_CRASH_RES_TO_IOMEM_EARLY the issue
persisted and kernel prints below logs on boot:
...snip ...
v3:
- Split the patch that adds the arch hook to handle special regions in
crashkernel reserved: Now 03/07 and 04/07.
- Dropped the patch that adds arch hooks to skip `Crash Kernel` from
iomem_resource (/proc/iomem). Instead, a patch is added to include
both `System RAM` and `Crash Kernel` memory ranges in iomem_resource: 06/07.
- Rearranged the patches to ensure that generic patches come first,
followed by PowerPC-specific patches.
- Added Acked-by tags.
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Baoquan he <bhe@xxxxxxxxxx>
Cc: Hari Bathini <hbathini@xxxxxxxxxxxxx>
CC: Madhavan Srinivasan <maddy@xxxxxxxxxxxxx>
Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Cc: kexec@xxxxxxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Cc: sourabhjain@xxxxxxxxxxxxx
Sourabh Jain (7):
kexec: Initialize ELF lowest address to ULONG_MAX
crash: remove an unused argument from reserve_crashkernel_generic()
crash: Let arch decide usable memory range in reserved area
powerpc/crash: Use generic APIs to locate memory hole for kdump
powerpc/crash: preserve user-specified memory limit
powerpc: insert System RAM resource to prevent crashkernel conflict
powerpc/crash: use generic crashkernel reservation
arch/arm64/mm/init.c | 6 +-
arch/loongarch/kernel/setup.c | 5 +-
arch/powerpc/Kconfig | 3 +
arch/powerpc/include/asm/crash_reserve.h | 8 +
arch/powerpc/include/asm/kexec.h | 10 +-
arch/powerpc/kernel/prom.c | 2 +-
arch/powerpc/kexec/core.c | 96 ++++-----
arch/powerpc/kexec/file_load_64.c | 259 +----------------------
arch/powerpc/mm/mem.c | 2 +-
arch/riscv/mm/init.c | 6 +-
arch/x86/kernel/setup.c | 6 +-
include/linux/crash_reserve.h | 11 +-
include/linux/kexec.h | 9 +
kernel/crash_reserve.c | 9 +-
kernel/kexec_elf.c | 2 +-
kernel/kexec_file.c | 12 ++
16 files changed, 105 insertions(+), 341 deletions(-)
create mode 100644 arch/powerpc/include/asm/crash_reserve.h
--
2.48.1
