mm/mmu_gather: pass "delay_rmap" instead of encoded page to __tlb_remove_page_size()

We have two bits available in the encoded page pointer to store additional
information.  Currently, we use one bit to request delay of the rmap
removal until after a TLB flush.

We want to make use of the remaining bit internally for batching of
multiple pages of the same folio, specifying that the next encoded page
pointer in an array is actually "nr_pages".  So pass page + delay_rmap
flag instead of an encoded page, to handle the encoding internally.

Link: https://lkml.kernel.org/r/20240214204435.167852-6-david@redhat.com
Signed-off-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Ryan Roberts <ryan.roberts@arm.com>
Cc: Alexander Gordeev <agordeev@linux.ibm.com>
Cc: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Christian Borntraeger <borntraeger@linux.ibm.com>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Michal Hocko <mhocko@suse.com>
Cc: "Naveen N. Rao" <naveen.n.rao@linux.ibm.com>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Sven Schnelle <svens@linux.ibm.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Yin Fengwei <fengwei.yin@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

1 files changed, 6 insertions, 7 deletions

diff --git a/arch/s390/include/asm/tlb.h b/arch/s390/include/asm/tlb.h
index d1455a601adc..48df896d5b79 100644
--- a/arch/s390/include/asm/tlb.h
+++ b/arch/s390/include/asm/tlb.h
@@ -25,8 +25,7 @@
 void __tlb_remove_table(void *_table);
 static inline void tlb_flush(struct mmu_gather *tlb);
 static inline bool __tlb_remove_page_size(struct mmu_gather *tlb,
-					  struct encoded_page *page,
-					  int page_size);
+		struct page *page, bool delay_rmap, int page_size);
 
 #define tlb_flush tlb_flush
 #define pte_free_tlb pte_free_tlb
@@ -42,14 +41,14 @@ static inline bool __tlb_remove_page_size(struct mmu_gather *tlb,
  * tlb_ptep_clear_flush. In both flush modes the tlb for a page cache page
  * has already been freed, so just do free_page_and_swap_cache.
  *
- * s390 doesn't delay rmap removal, so there is nothing encoded in
- * the page pointer.
+ * s390 doesn't delay rmap removal.
  */
 static inline bool __tlb_remove_page_size(struct mmu_gather *tlb,
-					  struct encoded_page *page,
-					  int page_size)
+		struct page *page, bool delay_rmap, int page_size)
 {
-	free_page_and_swap_cache(encoded_page_ptr(page));
+	VM_WARN_ON_ONCE(delay_rmap);
+
+	free_page_and_swap_cache(page);
 	return false;
 }