[for-next][PATCH 2/2] ring-buffer: Use vma_pages() helper function

Steven Rostedt
2024-07-16T18:03:04Z

From: Thorsten Blum <thorsten.blum@toblux.com>

Use the vma_pages() helper function and fix the following
Coccinelle/coccicheck warning reported by vma_pages.cocci:

WARNING: Consider using vma_pages helper on vma

Rename the local variable vma_pages accordingly.

Signed-off-by: Thorsten Blum <thorsten.blum@toblux.com>
Link: https://lore.kernel.org/20240709215657.322071-2-thorsten.blum@toblux.com
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
---
kernel/trace/ring_buffer.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index f3d772461a60..d59cf0023e38 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -6920,7 +6920,7 @@ static int __rb_inc_dec_mapped(struct ring_buffer_per_cpu *cpu_buffer,
static int __rb_map_vma(struct ring_buffer_per_cpu *cpu_buffer,
struct vm_area_struct *vma)
{
- unsigned long nr_subbufs, nr_pages, vma_pages, pgoff = vma->vm_pgoff;
+ unsigned long nr_subbufs, nr_pages, nr_vma_pages, pgoff = vma->vm_pgoff;
unsigned int subbuf_pages, subbuf_order;
struct page **pages;
int p = 0, s = 0;
@@ -6946,11 +6946,11 @@ static int __rb_map_vma(struct ring_buffer_per_cpu *cpu_buffer,
nr_subbufs = cpu_buffer->nr_pages + 1; /* + reader-subbuf */
nr_pages = ((nr_subbufs) << subbuf_order) - pgoff + 1; /* + meta-page */

- vma_pages = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
- if (!vma_pages || vma_pages > nr_pages)
+ nr_vma_pages = vma_pages(vma);
+ if (!nr_vma_pages || nr_vma_pages > nr_pages)
return -EINVAL;

- nr_pages = vma_pages;
+ nr_pages = nr_vma_pages;

pages = kcalloc(nr_pages, sizeof(*pages), GFP_KERNEL);
if (!pages)
--
2.43.0