linux-kernel - [PATCH v1 1/2] resource: Introduce resource

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Message-ID: <20250903081414.1972179-2-andriy.shevchenko@linux.intel.com>
Date: Wed,  3 Sep 2025 10:12:28 +0200
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
	linux-kernel@...r.kernel.org
Cc: Peter Tyser <ptyser@...-inc.com>,
	Lee Jones <lee@...nel.org>
Subject: [PATCH v1 1/2] resource: Introduce resource_rebase() helper

Introduce a helper to add an offset to the resource. This is helpful
in the cases when, for example) the resource has statically defined
the start and end fields, but the base of it is yet to be defined,
usually dynamically at run-time.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 include/linux/ioport.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/include/linux/ioport.h b/include/linux/ioport.h
index e8b2d6aa4013..159e74284d0b 100644
--- a/include/linux/ioport.h
+++ b/include/linux/ioport.h
@@ -290,6 +290,12 @@ static inline resource_size_t resource_size(const struct resource *res)
 {
 	return res->end - res->start + 1;
 }
+
+static inline void resource_rebase(struct resource *res, resource_size_t start)
+{
+	resource_set_range(res, start + res->start, resource_size(res));
+}
+
 static inline unsigned long resource_type(const struct resource *res)
 {
 	return res->flags & IORESOURCE_TYPE_BITS;
-- 
2.50.1