+ mm-highmem-fix-config_debug_kmap_local_force_map.patch added to -mm tree

[akpm@linux-foundation.org]

The patch titled
     Subject: mm/highmem: Fix CONFIG_DEBUG_KMAP_LOCAL_FORCE_MAP
has been added to the -mm tree.  Its filename is
     mm-highmem-fix-config_debug_kmap_local_force_map.patch

This patch should soon appear at
    https://ozlabs.org/~akpm/mmots/broken-out/mm-highmem-fix-config_debug_kmap_local_force_map.patch
and later at
    https://ozlabs.org/~akpm/mmotm/broken-out/mm-highmem-fix-config_debug_kmap_local_force_map.patch

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------------------------------------------------------
From: ira.weiny@intel.com
Subject: mm/highmem: Fix CONFIG_DEBUG_KMAP_LOCAL_FORCE_MAP


The kernel test robot found that __kmap_local_sched_out() was not
correctly skipping the guard pages when
CONFIG_DEBUG_KMAP_LOCAL_FORCE_MAP was set.[1]  This was due to
CONFIG_DEBUG_HIGHMEM check being used.

Change the configuration check to be correct.

[1] https://lore.kernel.org/lkml/20210304083825.GB17830@xsang-OptiPlex-9020/

Link: https://lkml.kernel.org/r/20210318230657.1497881-1-ira.weiny@intel.com
Fixes: 0e91a0c6984c ("mm/highmem: Provide CONFIG_DEBUG_KMAP_LOCAL_FORCE_MAP")
Signed-off-by: Ira Weiny <ira.weiny@intel.com>
Reported-by: kernel test robot <oliver.sang@intel.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Oliver Sang <oliver.sang@intel.com>
Cc: Chaitanya Kulkarni <Chaitanya.Kulkarni@wdc.com>
Cc: David Sterba <dsterba@suse.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/highmem.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/mm/highmem.c~mm-highmem-fix-config_debug_kmap_local_force_map
+++ a/mm/highmem.c
@@ -618,7 +618,7 @@ void __kmap_local_sched_out(void)
 		int idx;
 
 		/* With debug all even slots are unmapped and act as guard */
-		if (IS_ENABLED(CONFIG_DEBUG_HIGHMEM) && !(i & 0x01)) {
+		if (IS_ENABLED(CONFIG_DEBUG_KMAP_LOCAL) && !(i & 0x01)) {
 			WARN_ON_ONCE(!pte_none(pteval));
 			continue;
 		}
@@ -654,7 +654,7 @@ void __kmap_local_sched_in(void)
 		int idx;
 
 		/* With debug all even slots are unmapped and act as guard */
-		if (IS_ENABLED(CONFIG_DEBUG_HIGHMEM) && !(i & 0x01)) {
+		if (IS_ENABLED(CONFIG_DEBUG_KMAP_LOCAL) && !(i & 0x01)) {
 			WARN_ON_ONCE(!pte_none(pteval));
 			continue;
 		}
_

Patches currently in -mm which might be from ira.weiny@intel.com are

mm-highmem-fix-config_debug_kmap_local_force_map.patch
iov_iter-lift-memzero_page-to-highmemh.patch
btrfs-use-memzero_page-instead-of-open-coded-kmap-pattern.patch
mm-highmem-remove-deprecated-kmap_atomic.patch