android_kernel_xiaomi_sm8350/arch
Simon Horman 85a0ee342e kdump: add is_vmcore_usable() and vmcore_unusable()
The usage of elfcorehdr_addr has changed recently such that being set to
ELFCORE_ADDR_MAX is used by is_kdump_kernel() to indicate if the code is
executing in a kernel executed as a crash kernel.

However, arch/ia64/kernel/setup.c:reserve_elfcorehdr will rest
elfcorehdr_addr to ELFCORE_ADDR_MAX on error, which means any subsequent
calls to is_kdump_kernel() will return 0, even though they should return
1.

Ok, at this point in time there are no subsequent calls, but I think its
fair to say that there is ample scope for error or at the very least
confusion.

This patch add an extra state, ELFCORE_ADDR_ERR, which indicates that
elfcorehdr_addr was passed on the command line, and thus execution is
taking place in a crashdump kernel, but vmcore can't be used for some
reason.  This is tested for using is_vmcore_usable() and set using
vmcore_unusable().  A subsequent patch makes use of this new code.

To summarise, the states that elfcorehdr_addr can now be in are as follows:

ELFCORE_ADDR_MAX: not a crashdump kernel
ELFCORE_ADDR_ERR: crashdump kernel but vmcore is unusable
any other value:  crash dump kernel and vmcore is usable

Signed-off-by: Simon Horman <horms@verge.net.au>
Cc: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-10-20 08:52:40 -07:00
..
alpha container freezer: implement freezer cgroup subsystem 2008-10-20 08:52:34 -07:00
arm container freezer: implement freezer cgroup subsystem 2008-10-20 08:52:34 -07:00
avr32 container freezer: implement freezer cgroup subsystem 2008-10-20 08:52:34 -07:00
blackfin container freezer: implement freezer cgroup subsystem 2008-10-20 08:52:34 -07:00
cris container freezer: implement freezer cgroup subsystem 2008-10-20 08:52:34 -07:00
frv container freezer: implement freezer cgroup subsystem 2008-10-20 08:52:34 -07:00
h8300 container freezer: implement freezer cgroup subsystem 2008-10-20 08:52:34 -07:00
ia64 kdump: add is_vmcore_usable() and vmcore_unusable() 2008-10-20 08:52:40 -07:00
m32r container freezer: implement freezer cgroup subsystem 2008-10-20 08:52:34 -07:00
m68k arch/m68k/bvme6000/rtc.c: remove duplicated include 2008-10-20 08:52:34 -07:00
m68knommu container freezer: implement freezer cgroup subsystem 2008-10-20 08:52:34 -07:00
mips container freezer: implement freezer cgroup subsystem 2008-10-20 08:52:34 -07:00
mn10300 container freezer: implement freezer cgroup subsystem 2008-10-20 08:52:34 -07:00
parisc container freezer: implement freezer cgroup subsystem 2008-10-20 08:52:34 -07:00
powerpc kdump: make elfcorehdr_addr independent of CONFIG_PROC_VMCORE 2008-10-20 08:52:39 -07:00
s390 container freezer: implement freezer cgroup subsystem 2008-10-20 08:52:34 -07:00
sh kdump: make elfcorehdr_addr independent of CONFIG_PROC_VMCORE 2008-10-20 08:52:39 -07:00
sparc container freezer: implement freezer cgroup subsystem 2008-10-20 08:52:34 -07:00
sparc64 container freezer: implement freezer cgroup subsystem 2008-10-20 08:52:34 -07:00
um uml: fix a compile error 2008-10-20 08:52:34 -07:00
x86 kdump: make elfcorehdr_addr independent of CONFIG_PROC_VMCORE 2008-10-20 08:52:39 -07:00
xtensa container freezer: implement freezer cgroup subsystem 2008-10-20 08:52:34 -07:00
.gitignore
Kconfig Kconfig: eliminate "def_bool n" constructs 2008-10-16 11:21:31 -07:00