[PATCH] mm: cma: Add the CMA instance name to the cma_alloc_start trace event

[Georgi Djakov]

During CMA allocation, print also the name to identify the CMA instance.

Suggested-by: Minchan Kim <minc...@kernel.org>
Signed-off-by: Georgi Djakov <georgi.dja...@linaro.org>
---
 include/trace/events/cma.h | 9 ++++++---
 mm/cma.c                   | 2 +-
 2 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/include/trace/events/cma.h b/include/trace/events/cma.h
index cdfd06afb39a..be1525a10457 100644
--- a/include/trace/events/cma.h
+++ b/include/trace/events/cma.h
@@ -63,21 +63,24 @@ TRACE_EVENT(cma_release,
 
 TRACE_EVENT(cma_alloc_start,
 
-       TP_PROTO(unsigned int count, unsigned int align),
+       TP_PROTO(const char *name, unsigned int count, unsigned int align),
 
-       TP_ARGS(count, align),
+       TP_ARGS(name, count, align),
 
        TP_STRUCT__entry(
+               __string(name, name)
                __field(unsigned int, count)
                __field(unsigned int, align)
        ),
 
        TP_fast_assign(
+               __assign_str(name, name);
                __entry->count = count;
                __entry->align = align;
        ),
 
-       TP_printk("count=%u align=%u",
+       TP_printk("name=%s count=%u align=%u",
+                 __get_str(name),
                  __entry->count,
                  __entry->align)
 );
diff --git a/mm/cma.c b/mm/cma.c
index 984c85fd16ec..df5673d0b23d 100644
--- a/mm/cma.c
+++ b/mm/cma.c
@@ -443,7 +443,7 @@ struct page *cma_alloc(struct cma *cma, size_t count, 
unsigned int align,
        if (!count)
                goto out;
 
-       trace_cma_alloc_start(count, align);
+       trace_cma_alloc_start(cma->name, count, align);
 
        mask = cma_bitmap_aligned_mask(cma, align);
        offset = cma_bitmap_aligned_offset(cma, align);