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| author | Simon Horman <horms@verge.net.au> | 2008-10-18 20:28:29 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-10-20 08:52:40 -0700 |
| commit | 85a0ee342e0c06c19d78fdf48307211c6cf18fcb (patch) | |
| tree | 60022c0dca3c2dfc3084d1b301d349f6dcab5363 /fs | |
| parent | 630bf20747e27391b20f137a5be2edb4235ca8fa (diff) | |
| download | linux-85a0ee342e0c06c19d78fdf48307211c6cf18fcb.tar.gz linux-85a0ee342e0c06c19d78fdf48307211c6cf18fcb.tar.bz2 linux-85a0ee342e0c06c19d78fdf48307211c6cf18fcb.zip | |
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>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/proc/vmcore.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/proc/vmcore.c b/fs/proc/vmcore.c index 4c65ca432d30..cd9ca67f841b 100644 --- a/fs/proc/vmcore.c +++ b/fs/proc/vmcore.c @@ -644,7 +644,7 @@ static int __init vmcore_init(void) int rc = 0; /* If elfcorehdr= has been passed in cmdline, then capture the dump.*/ - if (!(elfcorehdr_addr < ELFCORE_ADDR_MAX)) + if (!(is_vmcore_usable())) return rc; rc = parse_crash_elf_headers(); if (rc) { |