[PATCH 4.4 02/91] pstore: Make spinlock per zone instead of global

[Greg Kroah-Hartman]

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Joel Fernandes <joe...@google.com>

commit 109704492ef637956265ec2eb72ae7b3b39eb6f4 upstream.

Currently pstore has a global spinlock for all zones. Since the zones
are independent and modify different areas of memory, there's no need
to have a global lock, so we should use a per-zone lock as introduced
here. Also, when ramoops's ftrace use-case has a FTRACE_PER_CPU flag
introduced later, which splits the ftrace memory area into a single zone
per CPU, it will eliminate the need for locking. In preparation for this,
make the locking optional.

Signed-off-by: Joel Fernandes <joe...@google.com>
[kees: updated commit message]
Signed-off-by: Kees Cook <keesc...@chromium.org>
Cc: Leo Yan <leo....@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 fs/pstore/ram_core.c       |   11 +++++------
 include/linux/pstore_ram.h |    1 +
 2 files changed, 6 insertions(+), 6 deletions(-)

--- a/fs/pstore/ram_core.c
+++ b/fs/pstore/ram_core.c
@@ -47,8 +47,6 @@ static inline size_t buffer_start(struct
        return atomic_read(&prz->buffer->start);
 }
 
-static DEFINE_RAW_SPINLOCK(buffer_lock);
-
 /* increase and wrap the start pointer, returning the old value */
 static size_t buffer_start_add(struct persistent_ram_zone *prz, size_t a)
 {
@@ -56,7 +54,7 @@ static size_t buffer_start_add(struct pe
        int new;
        unsigned long flags;
 
-       raw_spin_lock_irqsave(&buffer_lock, flags);
+       raw_spin_lock_irqsave(&prz->buffer_lock, flags);
 
        old = atomic_read(&prz->buffer->start);
        new = old + a;
@@ -64,7 +62,7 @@ static size_t buffer_start_add(struct pe
                new -= prz->buffer_size;
        atomic_set(&prz->buffer->start, new);
 
-       raw_spin_unlock_irqrestore(&buffer_lock, flags);
+       raw_spin_unlock_irqrestore(&prz->buffer_lock, flags);
 
        return old;
 }
@@ -76,7 +74,7 @@ static void buffer_size_add(struct persi
        size_t new;
        unsigned long flags;
 
-       raw_spin_lock_irqsave(&buffer_lock, flags);
+       raw_spin_lock_irqsave(&prz->buffer_lock, flags);
 
        old = atomic_read(&prz->buffer->size);
        if (old == prz->buffer_size)
@@ -88,7 +86,7 @@ static void buffer_size_add(struct persi
        atomic_set(&prz->buffer->size, new);
 
 exit:
-       raw_spin_unlock_irqrestore(&buffer_lock, flags);
+       raw_spin_unlock_irqrestore(&prz->buffer_lock, flags);
 }
 
 static void notrace persistent_ram_encode_rs8(struct persistent_ram_zone *prz,
@@ -450,6 +448,7 @@ static int persistent_ram_post_init(stru
 
        prz->buffer->sig = sig;
        persistent_ram_zap(prz);
+       prz->buffer_lock = __RAW_SPIN_LOCK_UNLOCKED(buffer_lock);
 
        return 0;
 }
--- a/include/linux/pstore_ram.h
+++ b/include/linux/pstore_ram.h
@@ -39,6 +39,7 @@ struct persistent_ram_zone {
        void *vaddr;
        struct persistent_ram_buffer *buffer;
        size_t buffer_size;
+       raw_spinlock_t buffer_lock;
 
        /* ECC correction */
        char *par_buffer;