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x86/crash: Update the stale comment in reserve_crashkernel()
CRASH_KERNEL_ADDR_MAX has been missing for a long time, update it with a more detailed explanation. Signed-off-by: Xunlei Pang <xlpang@redhat.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Baoquan He <bhe@redhat.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Dave Young <dyoung@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Robert LeBlanc <robert@leblancnet.us> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: kexec@lists.infradead.org Link: http://lkml.kernel.org/r/1485154103-18426-1-git-send-email-xlpang@redhat.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
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@ -575,7 +575,9 @@ static void __init reserve_crashkernel(void)
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/* 0 means: find the address automatically */
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/* 0 means: find the address automatically */
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if (crash_base <= 0) {
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if (crash_base <= 0) {
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/*
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/*
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* kexec want bzImage is below CRASH_KERNEL_ADDR_MAX
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* Set CRASH_ADDR_LOW_MAX upper bound for crash memory,
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* as old kexec-tools loads bzImage below that, unless
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* "crashkernel=size[KMG],high" is specified.
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*/
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*/
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crash_base = memblock_find_in_range(CRASH_ALIGN,
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crash_base = memblock_find_in_range(CRASH_ALIGN,
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high ? CRASH_ADDR_HIGH_MAX
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high ? CRASH_ADDR_HIGH_MAX
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