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Subject[ANNOUNCE] v5.6.14-rt7
Dear RT folks!

I'm pleased to announce the v5.6.14-rt7 patch set.

Changes since v5.6.14-rt6:

- 汪勇 sent a patch to not lose a line break on pr_cont() if
requested.

- A few missing locking spots were identified in the zswap patch while
it was reworked for upstream. Changes have been integrated in the
original patch.

Known issues
- It has been pointed out that due to changes to the printk code the
internal buffer representation changed. This is only an issue if tools
like `crash' are used to extract the printk buffer from a kernel memory
image.

The delta patch against v5.6.14-rt6 is appended below and can be found here:

https://cdn.kernel.org/pub/linux/kernel/projects/rt/5.6/incr/patch-5.6.14-rt6-rt7.patch.xz

You can get this release via the git tree at:

git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git v5.6.14-rt7

The RT patch against v5.6.14 can be found here:

https://cdn.kernel.org/pub/linux/kernel/projects/rt/5.6/older/patch-5.6.14-rt7.patch.xz

The split quilt queue is available at:

https://cdn.kernel.org/pub/linux/kernel/projects/rt/5.6/older/patches-5.6.14-rt7.tar.xz

Sebastian

diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
index 8bc683be08574..6296d348f3008 100644
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -1871,6 +1871,7 @@ 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);
}
}

diff --git a/localversion-rt b/localversion-rt
index 8fc605d806670..045478966e9f1 100644
--- a/localversion-rt
+++ b/localversion-rt
@@ -1 +1 @@
--rt6
+-rt7
diff --git a/mm/zswap.c b/mm/zswap.c
index 1591b5d37f65d..51944e98c1249 100644
--- a/mm/zswap.c
+++ b/mm/zswap.c
@@ -391,6 +391,8 @@ 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)
{
@@ -920,10 +922,11 @@ 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);
@@ -996,8 +999,6 @@ 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
**********************************/
@@ -1077,7 +1078,8 @@ 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);
@@ -1105,7 +1107,7 @@ 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;
@@ -1133,7 +1135,7 @@ 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);
@@ -1178,9 +1180,10 @@ 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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