linux-kernel - [PATCH v2 1/2] dma-buf: heaps: system: Remove global variable

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Message-Id: <20250401-dma-buf-ecc-heap-v2-1-043fd006a1af@kernel.org>
Date: Tue, 01 Apr 2025 17:12:21 +0200
From: Maxime Ripard <mripard@...nel.org>
To: Rob Herring <robh@...nel.org>, Saravana Kannan <saravanak@...gle.com>, 
 Sumit Semwal <sumit.semwal@...aro.org>, 
 Benjamin Gaignard <benjamin.gaignard@...labora.com>, 
 Brian Starkey <Brian.Starkey@....com>, John Stultz <jstultz@...gle.com>, 
 "T.J. Mercier" <tjmercier@...gle.com>, 
 Christian König <christian.koenig@....com>
Cc: Mattijs Korpershoek <mkorpershoek@...nel.org>, 
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-media@...r.kernel.org, dri-devel@...ts.freedesktop.org, 
 linaro-mm-sig@...ts.linaro.org, Maxime Ripard <mripard@...nel.org>
Subject: [PATCH v2 1/2] dma-buf: heaps: system: Remove global variable

The system heap has been using its struct dma_heap pointer but wasn't
using it anywhere.

Since we'll need additional parameters to attach to that heap type,
let's create a private structure and set it as the dma_heap drvdata,
removing the global variable in the process.

Signed-off-by: Maxime Ripard <mripard@...nel.org>
---
 drivers/dma-buf/heaps/system_heap.c | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/drivers/dma-buf/heaps/system_heap.c b/drivers/dma-buf/heaps/system_heap.c
index 26d5dc89ea1663a0d078e3a5723ca3d8d12b935f..adf422eaa33a52794f952d9d4260b8743d37f421 100644
--- a/drivers/dma-buf/heaps/system_heap.c
+++ b/drivers/dma-buf/heaps/system_heap.c
@@ -19,11 +19,13 @@
 #include <linux/module.h>
 #include <linux/scatterlist.h>
 #include <linux/slab.h>
 #include <linux/vmalloc.h>

-static struct dma_heap *sys_heap;
+struct system_heap {
+	struct dma_heap *heap;
+};

 struct system_heap_buffer {
 	struct dma_heap *heap;
 	struct list_head attachments;
 	struct mutex lock;
@@ -422,17 +424,22 @@ static const struct dma_heap_ops system_heap_ops = {
 };

 static int __init system_heap_create(void)
 {
 	struct dma_heap_export_info exp_info;
+	struct system_heap *sys_heap;
+
+	sys_heap = kzalloc(sizeof(*sys_heap), GFP_KERNEL);
+	if (!sys_heap)
+		return -ENOMEM;

 	exp_info.name = "system";
 	exp_info.ops = &system_heap_ops;
-	exp_info.priv = NULL;
+	exp_info.priv = sys_heap;

-	sys_heap = dma_heap_add(&exp_info);
-	if (IS_ERR(sys_heap))
-		return PTR_ERR(sys_heap);
+	sys_heap->heap = dma_heap_add(&exp_info);
+	if (IS_ERR(sys_heap->heap))
+		return PTR_ERR(sys_heap->heap);

 	return 0;
 }
 module_init(system_heap_create);

-- 
2.49.0