Subject: linux-next: manual merge of the arm64 tree with the mm tree

From: Stephen Rothwell <[email-masked]>
Date: Mon, 28 Oct 2024 11:10:58 +1100

Hi all,

Today's linux-next merge of the arm64 tree got a conflict in:

  include/linux/mm.h

between commit:

  e87ec503cf2e ("mm/codetag: uninline and move pgalloc_tag_copy and pgalloc_tag_split")

from the mm-unstable branch of the mm tree and commit:

  91e102e79740 ("prctl: arch-agnostic prctl for shadow stack")

from the arm64 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/mm.h
index 086ba524d3ba,8852c39c7695..000000000000
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@@ -4166,4 -4174,65 +4178,8 @@@ static inline int do_mseal(unsigned lon
  }
  #endif
  
 -#ifdef CONFIG_MEM_ALLOC_PROFILING
 -static inline void pgalloc_tag_split(struct folio *folio, int old_order, int new_order)
 -{
 -	int i;
 -	struct alloc_tag *tag;
 -	unsigned int nr_pages = 1 << new_order;
 -
 -	if (!mem_alloc_profiling_enabled())
 -		return;
 -
 -	tag = pgalloc_tag_get(&folio->page);
 -	if (!tag)
 -		return;
 -
 -	for (i = nr_pages; i < (1 << old_order); i += nr_pages) {
 -		union codetag_ref *ref = get_page_tag_ref(folio_page(folio, i));
 -
 -		if (ref) {
 -			/* Set new reference to point to the original tag */
 -			alloc_tag_ref_set(ref, tag);
 -			put_page_tag_ref(ref);
 -		}
 -	}
 -}
 -
 -static inline void pgalloc_tag_copy(struct folio *new, struct folio *old)
 -{
 -	struct alloc_tag *tag;
 -	union codetag_ref *ref;
 -
 -	tag = pgalloc_tag_get(&old->page);
 -	if (!tag)
 -		return;
 -
 -	ref = get_page_tag_ref(&new->page);
 -	if (!ref)
 -		return;
 -
 -	/* Clear the old ref to the original allocation tag. */
 -	clear_page_tag_ref(&old->page);
 -	/* Decrement the counters of the tag on get_new_folio. */
 -	alloc_tag_sub(ref, folio_nr_pages(new));
 -
 -	__alloc_tag_ref_set(ref, tag);
 -
 -	put_page_tag_ref(ref);
 -}
 -#else /* !CONFIG_MEM_ALLOC_PROFILING */
 -static inline void pgalloc_tag_split(struct folio *folio, int old_order, int new_order)
 -{
 -}
 -
 -static inline void pgalloc_tag_copy(struct folio *new, struct folio *old)
 -{
 -}
 -#endif /* CONFIG_MEM_ALLOC_PROFILING */
 -
+ int arch_get_shadow_stack_status(struct task_struct *t, unsigned long __user *status);
+ int arch_set_shadow_stack_status(struct task_struct *t, unsigned long status);
+ int arch_lock_shadow_stack_status(struct task_struct *t, unsigned long status);
+ 
  #endif /* _LINUX_MM_H */