Sourabh Jain 79365026f8 crash: add a new kexec flag for hotplug support ... Commit a72bbec70d ("crash: hotplug support for kexec_load()") introduced a new kexec flag, `KEXEC_UPDATE_ELFCOREHDR`. Kexec tool uses this flag to indicate to the kernel that it is safe to modify the elfcorehdr of the kdump image loaded using the kexec_load system call. However, it is possible that architectures may need to update kexec segments other then elfcorehdr. For example, FDT (Flatten Device Tree) on PowerPC. Introducing a new kexec flag for every new kexec segment may not be a good solution. Hence, a generic kexec flag bit, `KEXEC_CRASH_HOTPLUG_SUPPORT`, is introduced to share the CPU/Memory hotplug support intent between the kexec tool and the kernel for the kexec_load system call. Now we have two kexec flags that enables crash hotplug support for kexec_load system call. First is KEXEC_UPDATE_ELFCOREHDR (only used in x86), and second is KEXEC_CRASH_HOTPLUG_SUPPORT (for all architectures). To simplify the process of finding and reporting the crash hotplug support the following changes are introduced. 1. Define arch specific function to process the kexec flags and determine crash hotplug support 2. Rename the @update_elfcorehdr member of struct kimage to @hotplug_support and populate it for both kexec_load and kexec_file_load syscalls, because architecture can update more than one kexec segment 3. Let generic function crash_check_hotplug_support report hotplug support for loaded kdump image based on value of @hotplug_support To bring the x86 crash hotplug support in line with the above points, the following changes have been made: - Introduce the arch_crash_hotplug_support function to process kexec flags and determine crash hotplug support - Remove the arch_crash_hotplug_[cpu|memory]_support functions Signed-off-by: Sourabh Jain <sourabhjain@linux.ibm.com> Acked-by: Baoquan He <bhe@redhat.com> Acked-by: Hari Bathini <hbathini@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://msgid.link/20240326055413.186534-3-sourabhjain@linux.ibm.com		2024-04-23 14:59:01 +10:00
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acpi
asm-generic	export.h: remove include/asm-generic/export.h	2024-03-28 11:04:20 +09:00
clocksource
crypto
drm	drm fixes for 6.9-rc1	2024-03-21 19:04:31 -07:00
dt-bindings	Char/Misc and other driver subsystem updates for 6.9-rc1	2024-03-21 13:21:31 -07:00
keys
kunit
kvm
linux	crash: add a new kexec flag for hotplug support	2024-04-23 14:59:01 +10:00
math-emu
media
memory
misc
net	wireless fixes for v6.9-rc2	2024-03-27 15:39:18 -07:00
pcmcia
ras
rdma
rv
scsi	scsi: sd: Fix TCG OPAL unlock on system resume	2024-03-25 15:46:12 -04:00
soc	Char/Misc and other driver subsystem updates for 6.9-rc1	2024-03-21 13:21:31 -07:00
sound	sound fixes for 6.9-rc2	2024-03-28 14:54:49 -07:00
target
trace	tracing: Just use strcmp() for testing __string() and __assign_str() match	2024-03-19 11:23:30 -07:00
uapi	crash: add a new kexec flag for hotplug support	2024-04-23 14:59:01 +10:00
ufs
vdso
video
xen