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From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Thu, 20 Jun 2024 12:27:11 +0200
Subject: [PATCH 2/3] zram: Remove ZRAM_LOCK
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/6.10/older/patches-6.10.2-rt14.tar.xz
The ZRAM_LOCK was used for locking and after the addition of spinlock_t
the bit set and cleared but there no reader of it.
Remove the ZRAM_LOCK bit.
Link: https://lore.kernel.org/r/20240620153556.777272-3-bigeasy@linutronix.de
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
drivers/block/zram/zram_drv.c | 11 ++---------
drivers/block/zram/zram_drv.h | 4 +---
2 files changed, 3 insertions(+), 12 deletions(-)
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -67,23 +67,16 @@ static void zram_meta_init_table_locks(s
static int zram_slot_trylock(struct zram *zram, u32 index)
{
- int ret;
-
- ret = spin_trylock(&zram->table[index].lock);
- if (ret)
- __set_bit(ZRAM_LOCK, &zram->table[index].flags);
- return ret;
+ return spin_trylock(&zram->table[index].lock);
}
static void zram_slot_lock(struct zram *zram, u32 index)
{
spin_lock(&zram->table[index].lock);
- __set_bit(ZRAM_LOCK, &zram->table[index].flags);
}
static void zram_slot_unlock(struct zram *zram, u32 index)
{
- __clear_bit(ZRAM_LOCK, &zram->table[index].flags);
spin_unlock(&zram->table[index].lock);
}
@@ -1299,7 +1292,7 @@ static void zram_free_page(struct zram *
zram_set_handle(zram, index, 0);
zram_set_obj_size(zram, index, 0);
WARN_ON_ONCE(zram->table[index].flags &
- ~(1UL << ZRAM_LOCK | 1UL << ZRAM_UNDER_WB));
+ ~(1UL << ZRAM_UNDER_WB));
}
/*
--- a/drivers/block/zram/zram_drv.h
+++ b/drivers/block/zram/zram_drv.h
@@ -45,9 +45,7 @@
/* Flags for zram pages (table[page_no].flags) */
enum zram_pageflags {
- /* zram slot is locked */
- ZRAM_LOCK = ZRAM_FLAG_SHIFT,
- ZRAM_SAME, /* Page consists the same element */
+ ZRAM_SAME = ZRAM_FLAG_SHIFT, /* Page consists the same element */
ZRAM_WB, /* page is stored on backing_device */
ZRAM_UNDER_WB, /* page is under writeback */
ZRAM_HUGE, /* Incompressible page */
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