linux-kernel - linux-next: manual merge of the kvm tree with the vfs-brauner tree

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Date:   Wed, 22 Nov 2023 12:55:39 +1100
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     Paolo Bonzini <pbonzini@...hat.com>, KVM <kvm@...r.kernel.org>,
        Christian Brauner <brauner@...nel.org>
Cc:     Christoph Hellwig <hch@....de>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>,
        Sean Christopherson <seanjc@...gle.com>,
        Vlastimil Babka <vbabka@...e.cz>
Subject: linux-next: manual merge of the kvm tree with the vfs-brauner tree

Hi all,

Today's linux-next merge of the kvm tree got a conflict in:

  include/linux/pagemap.h

between commit:

  762321dab9a7 ("filemap: add a per-mapping stable writes flag")

from the vfs-brauner tree and commit:

  0003e2a41468 ("mm: Add AS_UNMOVABLE to mark mapping as completely unmovable")

from the kvm tree.

I fixed it up (see below) and can carry the fix as necessary. This
is now fixed as far as linux-next is concerned, but any non trivial
conflicts should be mentioned to your upstream maintainer when your tree
is submitted for merging.  You may also want to consider cooperating
with the maintainer of the conflicting tree to minimise any particularly
complex conflicts.

-- 
Cheers,
Stephen Rothwell

diff --cc include/linux/pagemap.h
index 06142ff7f9ce,bf2965b01b35..000000000000
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@@ -203,9 -203,8 +203,10 @@@ enum mapping_flags 
  	/* writeback related tags are not used */
  	AS_NO_WRITEBACK_TAGS = 5,
  	AS_LARGE_FOLIO_SUPPORT = 6,
- 	AS_RELEASE_ALWAYS,	/* Call ->release_folio(), even if no private data */
+ 	AS_RELEASE_ALWAYS = 7,	/* Call ->release_folio(), even if no private data */
+ 	AS_UNMOVABLE	= 8,	/* The mapping cannot be moved, ever */
 +	AS_STABLE_WRITES,	/* must wait for writeback before modifying
 +				   folio contents */
  };
  
  /**
@@@ -291,21 -290,22 +292,37 @@@ static inline void mapping_clear_releas
  	clear_bit(AS_RELEASE_ALWAYS, &mapping->flags);
  }
  
+ static inline void mapping_set_unmovable(struct address_space *mapping)
+ {
+ 	/*
+ 	 * It's expected unmovable mappings are also unevictable. Compaction
+ 	 * migrate scanner (isolate_migratepages_block()) relies on this to
+ 	 * reduce page locking.
+ 	 */
+ 	set_bit(AS_UNEVICTABLE, &mapping->flags);
+ 	set_bit(AS_UNMOVABLE, &mapping->flags);
+ }
+ 
+ static inline bool mapping_unmovable(struct address_space *mapping)
+ {
+ 	return test_bit(AS_UNMOVABLE, &mapping->flags);
+ }
+ 
 +static inline bool mapping_stable_writes(const struct address_space *mapping)
 +{
 +	return test_bit(AS_STABLE_WRITES, &mapping->flags);
 +}
 +
 +static inline void mapping_set_stable_writes(struct address_space *mapping)
 +{
 +	set_bit(AS_STABLE_WRITES, &mapping->flags);
 +}
 +
 +static inline void mapping_clear_stable_writes(struct address_space *mapping)
 +{
 +	clear_bit(AS_STABLE_WRITES, &mapping->flags);
 +}
 +
  static inline gfp_t mapping_gfp_mask(struct address_space * mapping)
  {
  	return mapping->gfp_mask;

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