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vmcore: remove dependency with is_kdump_kernel() for exporting vmcore

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Currently, is_kdump_kernel() returns true when elfcorehdr_addr is set.
While elfcorehdr_addr is set for kexec based kernel dump mechanism,
alternate dump capturing methods like fadump [1] also set it to export
the vmcore. Since, is_kdump_kernel() is used to restrict resources in
crash dump capture kernel and such restrictions may not be desirable
for fadump, allow is_kdump_kernel() to be defined differently for such
scenarios. With this, is_kdump_kernel() could be false while vmcore is
usable. So, remove unnecessary dependency with is_kdump_kernel(), for
exporting vmcore.

[1] https://docs.kernel.org/powerpc/firmware-assisted-dump.html

Suggested-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Hari Bathini <hbathini@linux.ibm.com>
Acked-by: Baoquan He <bhe@redhat.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20230912082950.856977-1-hbathini@linux.ibm.com
This commit is contained in:
Hari Bathini 2023-09-12 13:59:49 +05:30 committed by Michael Ellerman
parent 7135b921b3
commit 86328b338c
1 changed files with 5 additions and 3 deletions
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8
include/linux/crash_dump.h
View file

@ -50,6 +50,7 @@ void vmcore_cleanup(void);
#define vmcore_elf64_check_arch(x) (elf_check_arch(x) || vmcore_elf_check_arch_cross(x))
#endif
#ifndef is_kdump_kernel
/*
* is_kdump_kernel() checks whether this kernel is booting after a panic of
* previous kernel or not. This is determined by checking if previous kernel
@ -64,6 +65,7 @@ static inline bool is_kdump_kernel(void)
{
return elfcorehdr_addr != ELFCORE_ADDR_MAX;
}
#endif
/* is_vmcore_usable() checks if the kernel is booting after a panic and
* the vmcore region is usable.
@ -75,7 +77,8 @@ static inline bool is_kdump_kernel(void)
static inline int is_vmcore_usable(void)
{
return is_kdump_kernel() && elfcorehdr_addr != ELFCORE_ADDR_ERR ? 1 : 0;
return elfcorehdr_addr != ELFCORE_ADDR_ERR &&
elfcorehdr_addr != ELFCORE_ADDR_MAX ? 1 : 0;
}
/* vmcore_unusable() marks the vmcore as unusable,
@ -84,8 +87,7 @@ static inline int is_vmcore_usable(void)
static inline void vmcore_unusable(void)
{
if (is_kdump_kernel())
elfcorehdr_addr = ELFCORE_ADDR_ERR;
elfcorehdr_addr = ELFCORE_ADDR_ERR;
}
/**