The patch titled
Subject: frontswap: simplify frontswap_register_ops
has been added to the -mm tree. Its filename is
frontswap-simplify-frontswap_register_ops.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/frontswap-simplify-frontswap_register_ops.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/frontswap-simplify-frontswap_register_ops.patch
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------------------------------------------------------
From: Christoph Hellwig <hch@xxxxxx>
Subject: frontswap: simplify frontswap_register_ops
Given that frontswap_register_ops must be called from built-in code,
there is no need to handle the case of swapfiles coming online before
or during it, so delete the code that deals with that case.
Link: https://lkml.kernel.org/r/20211224062246.1258487-11-hch@xxxxxx
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Reviewed-by: Juergen Gross <jgross@xxxxxxxx>
Cc: Dan Streetman <ddstreet@xxxxxxxx>
Cc: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Konrad Rzeszutek Wilk <Konrad.wilk@xxxxxxxxxx>
Cc: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Cc: Seth Jennings <sjenning@xxxxxxxxxx>
Cc: Vitaly Wool <vitaly.wool@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/frontswap.c | 41 -----------------------------------------
1 file changed, 41 deletions(-)
--- a/mm/frontswap.c~frontswap-simplify-frontswap_register_ops
+++ a/mm/frontswap.c
@@ -99,25 +99,6 @@ static inline void inc_frontswap_invalid
*/
void frontswap_register_ops(struct frontswap_ops *ops)
{
- DECLARE_BITMAP(a, MAX_SWAPFILES);
- DECLARE_BITMAP(b, MAX_SWAPFILES);
- struct swap_info_struct *si;
- unsigned int i;
-
- bitmap_zero(a, MAX_SWAPFILES);
- bitmap_zero(b, MAX_SWAPFILES);
-
- spin_lock(&swap_lock);
- plist_for_each_entry(si, &swap_active_head, list) {
- if (!WARN_ON(!si->frontswap_map))
- __set_bit(si->type, a);
- }
- spin_unlock(&swap_lock);
-
- /* the new ops needs to know the currently active swap devices */
- for_each_set_bit(i, a, MAX_SWAPFILES)
- ops->init(i);
-
/*
* Setting frontswap_ops must happen after the ops->init() calls
* above; cmpxchg implies smp_mb() which will ensure the init is
@@ -128,28 +109,6 @@ void frontswap_register_ops(struct front
} while (cmpxchg(&frontswap_ops, ops->next, ops) != ops->next);
static_branch_inc(&frontswap_enabled_key);
-
- spin_lock(&swap_lock);
- plist_for_each_entry(si, &swap_active_head, list) {
- if (si->frontswap_map)
- __set_bit(si->type, b);
- }
- spin_unlock(&swap_lock);
-
- /*
- * On the very unlikely chance that a swap device was added or
- * removed between setting the "a" list bits and the ops init
- * calls, we re-check and do init or invalidate for any changed
- * bits.
- */
- if (unlikely(!bitmap_equal(a, b, MAX_SWAPFILES))) {
- for (i = 0; i < MAX_SWAPFILES; i++) {
- if (!test_bit(i, a) && test_bit(i, b))
- ops->init(i);
- else if (test_bit(i, a) && !test_bit(i, b))
- ops->invalidate_area(i);
- }
- }
}
/*
_
Patches currently in -mm which might be from hch@xxxxxx are
mm-remove-cleancache.patch
frontswap-remove-frontswap_writethrough.patch
frontswap-remove-frontswap_tmem_exclusive_gets.patch
frontswap-remove-frontswap_shrink.patch
frontswap-remove-frontswap_curr_pages.patch
frontswap-simplify-frontswap_init.patch
frontswap-remove-the-frontswap-exports.patch
mm-simplify-try_to_unuse.patch
frontswap-remove-frontswap_test.patch
frontswap-simplify-frontswap_register_ops.patch
mm-mark-swap_lock-and-swap_active_head-static.patch
frontswap-remove-support-for-multiple-ops.patch
mm-hide-the-frontswap-kconfig-symbol.patch
