linux-kernel - [PATCH v2 1/1] linux/io.h: Add cleanup defination for iounmap() and memunmap()

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Message-Id: <20240802170043.2809545-1-Frank.Li@nxp.com>
Date: Fri,  2 Aug 2024 13:00:43 -0400
From: Frank Li <Frank.Li@....com>
To: arnd@...db.de
Cc: Frank.li@....com,
	akpm@...ux-foundation.org,
	ast@...nel.org,
	imx@...ts.linux.dev,
	jgg@...pe.ca,
	kent.overstreet@...ux.dev,
	linux-kernel@...r.kernel.org,
	schnelle@...ux.ibm.com
Subject: [PATCH v2 1/1] linux/io.h: Add cleanup defination for iounmap() and memunmap()

Add DEFINE_FREE for iounmap() and memunmap() to support scope based
cleanup.

Signed-off-by: Frank Li <Frank.Li@....com>
---
Change from v1 to v2
- Remove IS_ERR_OR_NULL() and just simple use !(_T)
---
 include/linux/io.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/linux/io.h b/include/linux/io.h
index 59ec5eea696c4..4cce787d52805 100644
--- a/include/linux/io.h
+++ b/include/linux/io.h
@@ -163,6 +163,9 @@ enum {
 void *memremap(resource_size_t offset, size_t size, unsigned long flags);
 void memunmap(void *addr);
 
+DEFINE_FREE(iounmap, void __iomem *, if (!(_T)) iounmap(_T))
+DEFINE_FREE(memunmap, void *, if (!(_T)) memunmap(_T))
+
 /*
  * On x86 PAT systems we have memory tracking that keeps track of
  * the allowed mappings on memory ranges. This tracking works for
-- 
2.34.1