x86: query dynamic DEBUG_PAGEALLOC setting

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We can use debug_pagealloc_enabled() to check if we can map the identity
mapping with 2MB pages.  We can also add the state into the dump_stack
output.

The patch does not touch the code for the 1GB pages, which ignored
CONFIG_DEBUG_PAGEALLOC.  Do we need to fence this as well?

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: David Rientjes <rientjes@google.com>
Cc: Laura Abbott <labbott@fedoraproject.org>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

...

This commit is contained in:

Christian Borntraeger 2016-03-15 14:57:33 -07:00 • committed by Linus Torvalds

parent 8df651c705

commit 288cf3c64e

3 changed files with 10 additions and 16 deletions

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5

arch/x86/kernel/dumpstack.c

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7

arch/x86/mm/init.c

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14

arch/x86/mm/pageattr.c

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