The patch titled
Subject: mm/vmalloc: query dynamic DEBUG_PAGEALLOC setting
has been removed from the -mm tree. Its filename was
mm-vmalloc-query-dynamic-debug_pagealloc-setting.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
Subject: mm/vmalloc: query dynamic DEBUG_PAGEALLOC setting
As CONFIG_DEBUG_PAGEALLOC can be enabled/disabled via kernel parameters we
can optimize some cases by checking the enablement state.
This is follow-up work for Christian's Optimize CONFIG_DEBUG_PAGEALLOC:
https://lkml.org/lkml/2016/1/27/194
Remaining work is to make sparc to be aware of this but it looks not easy
for me so I skip that in this series.
This patch (of 5):
We can disable debug_pagealloc processing even if the code is complied
with CONFIG_DEBUG_PAGEALLOC. This patch changes the code to query
whether it is enabled or not in runtime.
[akpm@xxxxxxxxxxxxxxxxxxxx: update comment, per David. Adjust comment to use 80 cols]
Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
Reviewed-by: Christian Borntraeger <borntraeger@xxxxxxxxxx>
Acked-by: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: Takashi Iwai <tiwai@xxxxxxxx>
Cc: Chris Metcalf <cmetcalf@xxxxxxxxxx>
Cc: Christoph Lameter <cl@xxxxxxxxx>
Cc: Pekka Enberg <penberg@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/vmalloc.c | 25 ++++++++++++-------------
1 file changed, 12 insertions(+), 13 deletions(-)
diff -puN mm/vmalloc.c~mm-vmalloc-query-dynamic-debug_pagealloc-setting mm/vmalloc.c
--- a/mm/vmalloc.c~mm-vmalloc-query-dynamic-debug_pagealloc-setting
+++ a/mm/vmalloc.c
@@ -531,22 +531,21 @@ static void unmap_vmap_area(struct vmap_
static void vmap_debug_free_range(unsigned long start, unsigned long end)
{
/*
- * Unmap page tables and force a TLB flush immediately if
- * CONFIG_DEBUG_PAGEALLOC is set. This catches use after free
- * bugs similarly to those in linear kernel virtual address
- * space after a page has been freed.
+ * Unmap page tables and force a TLB flush immediately if pagealloc
+ * debugging is enabled. This catches use after free bugs similarly to
+ * those in linear kernel virtual address space after a page has been
+ * freed.
*
- * All the lazy freeing logic is still retained, in order to
- * minimise intrusiveness of this debugging feature.
+ * All the lazy freeing logic is still retained, in order to minimise
+ * intrusiveness of this debugging feature.
*
- * This is going to be *slow* (linear kernel virtual address
- * debugging doesn't do a broadcast TLB flush so it is a lot
- * faster).
+ * This is going to be *slow* (linear kernel virtual address debugging
+ * doesn't do a broadcast TLB flush so it is a lot faster).
*/
-#ifdef CONFIG_DEBUG_PAGEALLOC
- vunmap_page_range(start, end);
- flush_tlb_kernel_range(start, end);
-#endif
+ if (debug_pagealloc_enabled()) {
+ vunmap_page_range(start, end);
+ flush_tlb_kernel_range(start, end);
+ }
}
/*
_
Patches currently in -mm which might be from iamjoonsoo.kim@xxxxxxx are
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