+ mm-swap-remove-unused-local-variable-nr_shadows.patch added to -mm tree

+ mm-swap-remove-unused-local-variable-nr_shadows.patch added to -mm tree

[akpm]

The patch titled
     Subject: mm/swap: remove unused local variable nr_shadows
has been added to the -mm tree.  Its filename is
     mm-swap-remove-unused-local-variable-nr_shadows.patch

This patch should soon appear at
    https://ozlabs.org/~akpm/mmots/broken-out/mm-swap-remove-unused-local-variable-nr_shadows.patch
and later at
    https://ozlabs.org/~akpm/mmotm/broken-out/mm-swap-remove-unused-local-variable-nr_shadows.patch

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------------------------------------------------------
From: Miaohe Lin <linmiaohe@huawei.com>
Subject: mm/swap: remove unused local variable nr_shadows

Since commit 55c653b71e8c ("mm: stop accounting shadow entries"),
nr_shadows is not used anymore.

Link: https://lkml.kernel.org/r/20210520134022.1370406-3-linmiaohe@huawei.com
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/swap_state.c |    5 -----
 1 file changed, 5 deletions(-)

--- a/mm/swap_state.c~mm-swap-remove-unused-local-variable-nr_shadows
+++ a/mm/swap_state.c
@@ -114,8 +114,6 @@ int add_to_swap_cache(struct page *page,
 	SetPageSwapCache(page);
 
 	do {
-		unsigned long nr_shadows = 0;
-
 		xas_lock_irq(&xas);
 		xas_create_range(&xas);
 		if (xas_error(&xas))
@@ -124,7 +122,6 @@ int add_to_swap_cache(struct page *page,
 			VM_BUG_ON_PAGE(xas.xa_index != idx + i, page);
 			old = xas_load(&xas);
 			if (xa_is_value(old)) {
-				nr_shadows++;
 				if (shadowp)
 					*shadowp = old;
 			}
@@ -260,7 +257,6 @@ void clear_shadow_from_swap_cache(int ty
 	void *old;
 
 	for (;;) {
-		unsigned long nr_shadows = 0;
 		swp_entry_t entry = swp_entry(type, curr);
 		struct address_space *address_space = swap_address_space(entry);
 		XA_STATE(xas, &address_space->i_pages, curr);
@@ -270,7 +266,6 @@ void clear_shadow_from_swap_cache(int ty
 			if (!xa_is_value(old))
 				continue;
 			xas_store(&xas, NULL);
-			nr_shadows++;
 		}
 		xa_unlock_irq(&address_space->i_pages);
 
_

Patches currently in -mm which might be from linmiaohe@huawei.com are

mm-swapfile-use-percpu_ref-to-serialize-against-concurrent-swapoff.patch
swap-fix-do_swap_page-race-with-swapoff.patch
mm-swap-remove-confusing-checking-for-non_swap_entry-in-swap_ra_info.patch
mm-shmem-fix-shmem_swapin-race-with-swapoff.patch
mm-swapfile-move-get_swap_page_of_type-under-config_hibernation.patch
mm-swap-remove-unused-local-variable-nr_shadows.patch
mm-swap_slotsc-delete-meaningless-forward-declarations.patch
mm-swap-remove-unused-global-variable-nr_swapper_spaces.patch
mm-huge_memoryc-remove-dedicated-macro-hpage_cache_index_mask.patch
mm-huge_memoryc-use-page-deferred_list.patch
mm-huge_memoryc-add-missing-read-only-thp-checking-in-transparent_hugepage_enabled.patch
mm-huge_memoryc-add-missing-read-only-thp-checking-in-transparent_hugepage_enabled-v4.patch
mm-huge_memoryc-remove-unnecessary-tlb_remove_page_size-for-huge-zero-pmd.patch
mm-huge_memoryc-dont-discard-hugepage-if-other-processes-are-mapping-it.patch