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authorVlastimil Babka <vbabka@suse.cz>2017-06-12 09:21:30 +0200
committerIngo Molnar <mingo@kernel.org>2017-06-13 08:33:00 +0200
commitd9ee35acfabbc909c3be4360cd5655a006628b2e (patch)
tree63e917752db67d24d0f2c37f8116ee8463e11c5c /arch
parent8a524f803a3e0290cdba6d373361b2cef9752934 (diff)
downloadlinux-d9ee35acfabbc909c3be4360cd5655a006628b2e.tar.bz2
x86/mm: Disable 1GB direct mappings when disabling 2MB mappings
The kmemleak and debug_pagealloc features both disable using huge pages for direct mappings so they can do cpa() on page level granularity in any context. However they only do that for 2MB pages, which means 1GB pages can still be used if the CPU supports it, unless disabled by a boot param, which is non-obvious. Disable also 1GB pages when disabling 2MB pages. Signed-off-by: Vlastimil Babka <vbabka@suse.cz> Cc: Christian Borntraeger <borntraeger@de.ibm.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Pekka Enberg <penberg@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vegard Nossum <vegardno@ifi.uio.no> Cc: linux-mm@kvack.org Link: http://lkml.kernel.org/r/2be70c78-6130-855d-3dfa-d87bd1dd4fda@suse.cz Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/mm/init.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c
index cbc87ea98751..9b3f9fa5b283 100644
--- a/arch/x86/mm/init.c
+++ b/arch/x86/mm/init.c
@@ -161,16 +161,16 @@ static int page_size_mask;
static void __init probe_page_size_mask(void)
{
-#if !defined(CONFIG_KMEMCHECK)
/*
* For CONFIG_KMEMCHECK or pagealloc debugging, identity mapping will
* use small pages.
* This will simplify cpa(), which otherwise needs to support splitting
* large pages into small in interrupt context, etc.
*/
- if (boot_cpu_has(X86_FEATURE_PSE) && !debug_pagealloc_enabled())
+ if (boot_cpu_has(X86_FEATURE_PSE) && !debug_pagealloc_enabled() && !IS_ENABLED(CONFIG_KMEMCHECK))
page_size_mask |= 1 << PG_LEVEL_2M;
-#endif
+ else
+ direct_gbpages = 0;
/* Enable PSE if available */
if (boot_cpu_has(X86_FEATURE_PSE))