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x86/mm: Introduce max_possible_pfn

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max_possible_pfn will be used for tracking max possible
PFN for memory that isn't present in E820 table and
could be hotplugged later.

By default max_possible_pfn is initialized with max_pfn,
but later it could be updated with highest PFN of
hotpluggable memory ranges declared in ACPI SRAT table
if any present.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: akataria@vmware.com
Cc: fujita.tomonori@lab.ntt.co.jp
Cc: konrad.wilk@oracle.com
Cc: pbonzini@redhat.com
Cc: revers@redhat.com
Cc: riel@redhat.com
Link: http://lkml.kernel.org/r/1449234426-273049-2-git-send-email-imammedo@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Igor Mammedov
2015-12-04 14:07:05 +01:00
committed by Ingo Molnar
parent 071ac0c4e8
commit 8dd3303001
5 changed files with 10 additions and 0 deletions
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4
include/linux/bootmem.h
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@ -19,6 +19,10 @@ extern unsigned long min_low_pfn;
* highest page
*/
extern unsigned long max_pfn;
/*
* highest possible page
*/
extern unsigned long long max_possible_pfn;
#ifndef CONFIG_NO_BOOTMEM
/*