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. is_kdump_kernel() is used to restrict resources in crash dump capture kernel but 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, introduce is_crashdump_kernel() to return true when elfcorehdr_addr is set and use it for vmcore related checks.
[1] https://docs.kernel.org/powerpc/firmware-assisted-dump.html Signed-off-by: Hari Bathini <hbath...@linux.ibm.com> --- include/linux/crash_dump.h | 18 ++++++++++++++++-- 1 file changed, 16 insertions(+), 2 deletions(-) diff --git a/include/linux/crash_dump.h b/include/linux/crash_dump.h index 0f3a656293b0..1052a0faf0dd 100644 --- a/include/linux/crash_dump.h +++ b/include/linux/crash_dump.h @@ -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 +65,19 @@ static inline bool is_kdump_kernel(void) { return elfcorehdr_addr != ELFCORE_ADDR_MAX; } +#endif + +/* + * Return true if this is a dump capture kernel, where vmcore needs to be + * exported, irrespective of the dump capture mechanism in use. + * + * Same as is_kdump_kernel() unless arch specific code defines is_kdump_kernel() + * differently while supporting other dump capturing mechanisms. + */ +static inline bool is_crashdump_kernel(void) +{ + return elfcorehdr_addr != ELFCORE_ADDR_MAX; +} /* is_vmcore_usable() checks if the kernel is booting after a panic and * the vmcore region is usable. @@ -75,7 +89,7 @@ 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 is_crashdump_kernel() && elfcorehdr_addr != ELFCORE_ADDR_ERR ? 1 : 0; } /* vmcore_unusable() marks the vmcore as unusable, @@ -84,7 +98,7 @@ static inline int is_vmcore_usable(void) static inline void vmcore_unusable(void) { - if (is_kdump_kernel()) + if (is_crashdump_kernel()) elfcorehdr_addr = ELFCORE_ADDR_ERR; } -- 2.41.0 _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec
