[PATCH v0 1/6] perf/x86/intel/pt: Clean up ToPA allocation path

[Alexander Shishkin]

Some of the allocation parameters are passed as function arguments,
while the CPU number for per-cpu allocation is passed via the buffer
object. There's no reason for this.

Pass the CPU as a function argument instead.

Signed-off-by: Alexander Shishkin <alexander.shish...@linux.intel.com>
---
 arch/x86/events/intel/pt.c | 15 +++++++--------
 arch/x86/events/intel/pt.h |  2 --
 2 files changed, 7 insertions(+), 10 deletions(-)

diff --git a/arch/x86/events/intel/pt.c b/arch/x86/events/intel/pt.c
index a7318c29242e..b029f32edae2 100644
--- a/arch/x86/events/intel/pt.c
+++ b/arch/x86/events/intel/pt.c
@@ -670,7 +670,7 @@ static bool topa_table_full(struct topa *topa)
  *
  * Return:     0 on success or error code.
  */
-static int topa_insert_pages(struct pt_buffer *buf, gfp_t gfp)
+static int topa_insert_pages(struct pt_buffer *buf, int cpu, gfp_t gfp)
 {
        struct topa *topa = buf->last;
        int order = 0;
@@ -681,7 +681,7 @@ static int topa_insert_pages(struct pt_buffer *buf, gfp_t 
gfp)
                order = page_private(p);
 
        if (topa_table_full(topa)) {
-               topa = topa_alloc(buf->cpu, gfp);
+               topa = topa_alloc(cpu, gfp);
                if (!topa)
                        return -ENOMEM;
 
@@ -1061,20 +1061,20 @@ static void pt_buffer_fini_topa(struct pt_buffer *buf)
  * @size:      Total size of all regions within this ToPA.
  * @gfp:       Allocation flags.
  */
-static int pt_buffer_init_topa(struct pt_buffer *buf, unsigned long nr_pages,
-                              gfp_t gfp)
+static int pt_buffer_init_topa(struct pt_buffer *buf, int cpu,
+                              unsigned long nr_pages, gfp_t gfp)
 {
        struct topa *topa;
        int err;
 
-       topa = topa_alloc(buf->cpu, gfp);
+       topa = topa_alloc(cpu, gfp);
        if (!topa)
                return -ENOMEM;
 
        topa_insert_table(buf, topa);
 
        while (buf->nr_pages < nr_pages) {
-               err = topa_insert_pages(buf, gfp);
+               err = topa_insert_pages(buf, cpu, gfp);
                if (err) {
                        pt_buffer_fini_topa(buf);
                        return -ENOMEM;
@@ -1124,13 +1124,12 @@ pt_buffer_setup_aux(struct perf_event *event, void 
**pages,
        if (!buf)
                return NULL;
 
-       buf->cpu = cpu;
        buf->snapshot = snapshot;
        buf->data_pages = pages;
 
        INIT_LIST_HEAD(&buf->tables);
 
-       ret = pt_buffer_init_topa(buf, nr_pages, GFP_KERNEL);
+       ret = pt_buffer_init_topa(buf, cpu, nr_pages, GFP_KERNEL);
        if (ret) {
                kfree(buf);
                return NULL;
diff --git a/arch/x86/events/intel/pt.h b/arch/x86/events/intel/pt.h
index 63fe4063fbd6..8de8ed089697 100644
--- a/arch/x86/events/intel/pt.h
+++ b/arch/x86/events/intel/pt.h
@@ -53,7 +53,6 @@ struct pt_pmu {
 /**
  * struct pt_buffer - buffer configuration; one buffer per task_struct or
  *             cpu, depending on perf event configuration
- * @cpu:       cpu for per-cpu allocation
  * @tables:    list of ToPA tables in this buffer
  * @first:     shorthand for first topa table
  * @last:      shorthand for last topa table
@@ -71,7 +70,6 @@ struct pt_pmu {
  * @topa_index:        table of topa entries indexed by page offset
  */
 struct pt_buffer {
-       int                     cpu;
        struct list_head        tables;
        struct topa             *first, *last, *cur;
        unsigned int            cur_idx;
-- 
2.23.0.rc1