[IA64] Kexec/Kdump: honour non-zero crashkernel offset. (ad1c3ba7) · Commits · 戴 / test

There seems to be a value in both allowing the kernel to determine the base offset of the crashkernel automatically and allowing users's to sepcify it. The old behaviour on ia64, which is still the current behaviour on most architectures is for the user to always specify the address. Recently ia64 was changed so that it is always automatically determined. With this patch the kernel automatically determines the offset if the supplied value is 0, otherwise it uses the value provided. This should probably be backed by a documentation change. Signed-Off-By:

Simon Horman <horms@verge.net.au> Signed-off-by:

Tony Luck <tony.luck@intel.com>

arch/ia64/kernel/setup.c

+10 −4

Original line number	Diff line number	Diff line
		@@ -256,7 +256,7 @@ reserve_memory (void)

		#ifdef CONFIG_KEXEC
		/* crashkernel=size@offset specifies the size to reserve for a crash
		* kernel.(offset is ingored for keep compatibility with other archs)
		* kernel. If offset is 0, then it is determined automatically.
		* By reserving this memory we guarantee that linux never set's it
		* up as a DMA target.Useful for holding code to do something
		* appropriate after a kernel panic.
		@@ -266,10 +266,16 @@ reserve_memory (void)
		unsigned long base, size;
		if (from) {
		size = memparse(from + 12, &from);
		if (*from == '@')
		base = memparse(from+1, &from);
		else
		base = 0;
		if (size) {
		if (!base) {
		sort_regions(rsvd_region, n);
		base = kdump_find_rsvd_region(size,
		rsvd_region, n);
		}
		if (base != ~0UL) {
		rsvd_region[n].start =
		(unsigned long)__va(base);

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