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Date: Tue, 9 Jun 2020 16:29:46 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: LKML <linux-kernel@...r.kernel.org>,
linux-rt-users <linux-rt-users@...r.kernel.org>,
Thomas Gleixner <tglx@...utronix.de>,
Carsten Emde <C.Emde@...dl.org>,
John Kacur <jkacur@...hat.com>,
Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
Daniel Wagner <wagi@...om.org>,
Tom Zanussi <zanussi@...nel.org>,
"Srivatsa S. Bhat" <srivatsa@...il.mit.edu>
Subject: [ANNOUNCE] 5.4.44-rt27
Dear RT Folks,
I'm pleased to announce the 5.4.44-rt27 stable release.
You can get this release via the git tree at:
git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-stable-rt.git
branch: v5.4-rt
Head SHA1: ee8a165804fcf167113319fa659a4a3d1f18e536
Or to build 5.4.44-rt27 directly, the following patches should be applied:
http://www.kernel.org/pub/linux/kernel/v5.x/linux-5.4.tar.xz
http://www.kernel.org/pub/linux/kernel/v5.x/patch-5.4.44.xz
http://www.kernel.org/pub/linux/kernel/projects/rt/5.4/patch-5.4.44-rt27.patch.xz
You can also build from 5.4.44-rt26 by applying the incremental patch:
http://www.kernel.org/pub/linux/kernel/projects/rt/5.4/incr/patch-5.4.44-rt26-rt27.patch.xz
Enjoy,
-- Steve
Changes from v5.4.44-rt26:
---
John Ogness (1):
printk: console must not schedule for drivers
Kevin Hao (1):
mm: slub: Always flush the delayed empty slubs in flush_all()
Liwei Song (1):
mm: Don't warn about atomic memory allocations during suspend
Sebastian Andrzej Siewior (3):
fs/dcache: Include swait.h header
Revert "rt: Improve the serial console PASS_LIMIT"
mm/zswap: Use local lock to protect per-CPU data
Steven Rostedt (VMware) (1):
Linux 5.4.44-rt27
汪勇10269566 (1):
printk: Force a line break on pr_cont(" ")
----
drivers/tty/serial/8250/8250_core.c | 11 +----------
fs/proc/base.c | 1 +
kernel/printk/printk.c | 2 ++
localversion-rt | 2 +-
mm/slub.c | 11 +++++------
mm/zswap.c | 21 ++++++++++++---------
6 files changed, 22 insertions(+), 26 deletions(-)
---------------------------
diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c
index 809a65f68028..02bfafa8a672 100644
--- a/drivers/tty/serial/8250/8250_core.c
+++ b/drivers/tty/serial/8250/8250_core.c
@@ -55,16 +55,7 @@ static struct uart_driver serial8250_reg;
static unsigned int skip_txen_test; /* force skip of txen test at init time */
-/*
- * On -rt we can have a more delays, and legitimately
- * so - so don't drop work spuriously and spam the
- * syslog:
- */
-#ifdef CONFIG_PREEMPT_RT
-# define PASS_LIMIT 1000000
-#else
-# define PASS_LIMIT 512
-#endif
+#define PASS_LIMIT 512
#include <asm/serial.h>
/*
diff --git a/fs/proc/base.c b/fs/proc/base.c
index 2dcd8fb3abb5..dc6cfa5de1df 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -95,6 +95,7 @@
#include <linux/sched/stat.h>
#include <linux/posix-timers.h>
#include <trace/events/oom.h>
+#include <linux/swait.h>
#include "internal.h"
#include "fd.h"
diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
index 2affe95866a4..2beb8eac13d1 100644
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -1902,6 +1902,7 @@ static void cont_add(int ctx, int cpu, u32 caller_id, int facility, int level,
// but later continuations can add a newline.
if (flags & LOG_NEWLINE) {
c->flags |= LOG_NEWLINE;
+ cont_flush(ctx);
}
}
@@ -2746,6 +2747,7 @@ static int printk_kthread_func(void *data)
&len, printk_time);
console_lock();
+ console_may_schedule = 0;
call_console_drivers(master_seq, ext_text, ext_len, text, len,
msg->level, msg->facility);
if (len > 0 || ext_len > 0)
diff --git a/localversion-rt b/localversion-rt
index 2e9afd4a0afd..be1e37b64ad0 100644
--- a/localversion-rt
+++ b/localversion-rt
@@ -1 +1 @@
--rt26
+-rt27
diff --git a/mm/slub.c b/mm/slub.c
index 44a602fc8a16..b2809a9ca8f8 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -1635,7 +1635,7 @@ static struct page *allocate_slab(struct kmem_cache *s, gfp_t flags, int node)
enableirqs = true;
#ifdef CONFIG_PREEMPT_RT
- if (system_state > SYSTEM_BOOTING)
+ if (system_state > SYSTEM_BOOTING && system_state < SYSTEM_SUSPEND)
enableirqs = true;
#endif
if (enableirqs)
@@ -2382,9 +2382,6 @@ static void flush_all(struct kmem_cache *s)
for_each_online_cpu(cpu) {
struct slub_free_list *f;
- if (!has_cpu_slab(cpu, s))
- continue;
-
f = &per_cpu(slub_free_list, cpu);
raw_spin_lock_irq(&f->lock);
list_splice_init(&f->list, &tofree);
@@ -2751,7 +2748,8 @@ static __always_inline void *slab_alloc_node(struct kmem_cache *s,
unsigned long tid;
if (IS_ENABLED(CONFIG_PREEMPT_RT) && IS_ENABLED(CONFIG_DEBUG_ATOMIC_SLEEP))
- WARN_ON_ONCE(!preemptible() && system_state >= SYSTEM_SCHEDULING);
+ WARN_ON_ONCE(!preemptible() &&
+ (system_state > SYSTEM_BOOTING && system_state < SYSTEM_SUSPEND));
s = slab_pre_alloc_hook(s, gfpflags);
if (!s)
@@ -3216,7 +3214,8 @@ int kmem_cache_alloc_bulk(struct kmem_cache *s, gfp_t flags, size_t size,
int i;
if (IS_ENABLED(CONFIG_PREEMPT_RT) && IS_ENABLED(CONFIG_DEBUG_ATOMIC_SLEEP))
- WARN_ON_ONCE(!preemptible() && system_state >= SYSTEM_SCHEDULING);
+ WARN_ON_ONCE(!preemptible() &&
+ (system_state > SYSTEM_BOOTING && system_state < SYSTEM_SUSPEND));
/* memcg and kmem_cache debug support */
s = slab_pre_alloc_hook(s, flags);
diff --git a/mm/zswap.c b/mm/zswap.c
index 21d2d3ed3d6d..3c9644b51f3f 100644
--- a/mm/zswap.c
+++ b/mm/zswap.c
@@ -372,6 +372,8 @@ static struct zswap_entry *zswap_entry_find_get(struct rb_root *root,
* per-cpu code
**********************************/
static DEFINE_PER_CPU(u8 *, zswap_dstmem);
+/* Used for zswap_dstmem and tfm */
+static DEFINE_LOCAL_IRQ_LOCK(zswap_cpu_lock);
static int zswap_dstmem_prepare(unsigned int cpu)
{
@@ -889,10 +891,11 @@ static int zswap_writeback_entry(struct zpool *pool, unsigned long handle)
dlen = PAGE_SIZE;
src = (u8 *)zhdr + sizeof(struct zswap_header);
dst = kmap_atomic(page);
- tfm = *get_cpu_ptr(entry->pool->tfm);
+ local_lock(zswap_cpu_lock);
+ tfm = *this_cpu_ptr(entry->pool->tfm);
ret = crypto_comp_decompress(tfm, src, entry->length,
dst, &dlen);
- put_cpu_ptr(entry->pool->tfm);
+ local_unlock(zswap_cpu_lock);
kunmap_atomic(dst);
BUG_ON(ret);
BUG_ON(dlen != PAGE_SIZE);
@@ -981,8 +984,6 @@ static void zswap_fill_page(void *ptr, unsigned long value)
memset_l(page, value, PAGE_SIZE / sizeof(unsigned long));
}
-/* protect zswap_dstmem from concurrency */
-static DEFINE_LOCAL_IRQ_LOCK(zswap_dstmem_lock);
/*********************************
* frontswap hooks
**********************************/
@@ -1060,7 +1061,8 @@ static int zswap_frontswap_store(unsigned type, pgoff_t offset,
}
/* compress */
- dst = get_locked_var(zswap_dstmem_lock, zswap_dstmem);
+ local_lock(zswap_cpu_lock);
+ dst = *this_cpu_ptr(&zswap_dstmem);
tfm = *this_cpu_ptr(entry->pool->tfm);
src = kmap_atomic(page);
ret = crypto_comp_compress(tfm, src, PAGE_SIZE, dst, &dlen);
@@ -1088,7 +1090,7 @@ static int zswap_frontswap_store(unsigned type, pgoff_t offset,
memcpy(buf, &zhdr, hlen);
memcpy(buf + hlen, dst, dlen);
zpool_unmap_handle(entry->pool->zpool, handle);
- put_locked_var(zswap_dstmem_lock, zswap_dstmem);
+ local_unlock(zswap_cpu_lock);
/* populate entry */
entry->offset = offset;
@@ -1116,7 +1118,7 @@ static int zswap_frontswap_store(unsigned type, pgoff_t offset,
return 0;
put_dstmem:
- put_locked_var(zswap_dstmem_lock, zswap_dstmem);
+ local_unlock(zswap_cpu_lock);
zswap_pool_put(entry->pool);
freepage:
zswap_entry_cache_free(entry);
@@ -1161,9 +1163,10 @@ static int zswap_frontswap_load(unsigned type, pgoff_t offset,
if (zpool_evictable(entry->pool->zpool))
src += sizeof(struct zswap_header);
dst = kmap_atomic(page);
- tfm = *get_cpu_ptr(entry->pool->tfm);
+ local_lock(zswap_cpu_lock);
+ tfm = *this_cpu_ptr(entry->pool->tfm);
ret = crypto_comp_decompress(tfm, src, entry->length, dst, &dlen);
- put_cpu_ptr(entry->pool->tfm);
+ local_unlock(zswap_cpu_lock);
kunmap_atomic(dst);
zpool_unmap_handle(entry->pool->zpool, entry->handle);
BUG_ON(ret);
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