diff options
| author | Anton Blanchard <anton@samba.org> | 2010-08-25 10:22:58 +1000 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2011-04-01 16:14:30 +1100 |
| commit | c0bb9e45f3a7f67fc358946727bc3d5f23d0f55d (patch) | |
| tree | 55b320cd26722eb6e201110b4aceddfa15983722 | |
| parent | 76d479a7caff58b1e5f31d80805f7f65f9177696 (diff) | |
kdump: Allow shrinking of kdump region to be overridden
On ppc64 the crashkernel region almost always overlaps an area of firmware.
This works fine except when using the sysfs interface to reduce the kdump
region. If we free the firmware area we are guaranteed to crash.
Rename free_reserved_phys_range to crash_free_reserved_phys_range and make
it a weak function so we can override it.
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
| -rw-r--r-- | include/linux/kexec.h | 1 | ||||
| -rw-r--r-- | kernel/kexec.c | 5 |
2 files changed, 4 insertions, 2 deletions
diff --git a/include/linux/kexec.h b/include/linux/kexec.h index 03e8e8dbc57..c2478a342cd 100644 --- a/include/linux/kexec.h +++ b/include/linux/kexec.h @@ -208,6 +208,7 @@ int __init parse_crashkernel(char *cmdline, unsigned long long system_ram, unsigned long long *crash_size, unsigned long long *crash_base); int crash_shrink_memory(unsigned long new_size); size_t crash_get_memory_size(void); +void crash_free_reserved_phys_range(unsigned long begin, unsigned long end); #else /* !CONFIG_KEXEC */ struct pt_regs; diff --git a/kernel/kexec.c b/kernel/kexec.c index ec19b92c7eb..4e240a378df 100644 --- a/kernel/kexec.c +++ b/kernel/kexec.c @@ -1099,7 +1099,8 @@ size_t crash_get_memory_size(void) return size; } -static void free_reserved_phys_range(unsigned long begin, unsigned long end) +void __weak crash_free_reserved_phys_range(unsigned long begin, + unsigned long end) { unsigned long addr; @@ -1135,7 +1136,7 @@ int crash_shrink_memory(unsigned long new_size) start = roundup(start, PAGE_SIZE); end = roundup(start + new_size, PAGE_SIZE); - free_reserved_phys_range(end, crashk_res.end); + crash_free_reserved_phys_range(end, crashk_res.end); if ((start == end) && (crashk_res.parent != NULL)) release_resource(&crashk_res); |