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pstore: Make spinlock per zone instead of global

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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 <joelaf@google.com>
[kees: updated commit message]
Signed-off-by: Kees Cook <keescook@chromium.org>
This commit is contained in:
Joel Fernandes 2016-10-20 00:34:00 -07:00 • committed by Kees Cook
parent 959217c84c
commit 109704492e
2 changed files with 6 additions and 6 deletions
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1
include/linux/pstore_ram.h
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@ -40,6 +40,7 @@ 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;