From 08408f7ae5cdc7b8ef439f29b8d3dff9f1389c25 Mon Sep 17 00:00:00 2001 From: Joel Fernandes Date: Thu, 20 Oct 2016 00:34:00 -0700 Subject: pstore: Make spinlock per zone instead of global 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 [kees: updated commit message] Signed-off-by: Kees Cook Cc: Leo Yan Signed-off-by: Greg Kroah-Hartman --- include/linux/pstore_ram.h | 1 + 1 file changed, 1 insertion(+) (limited to 'include/linux') diff --git a/include/linux/pstore_ram.h b/include/linux/pstore_ram.h index 9c9d6c154c8e..893ee9a0f8de 100644 --- 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; -- cgit v1.2.3