linux-kernel - [PATCH v2 1/3] err.h: add INIT_ERR

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Message-ID: <20251031130835.7953-2-ansuelsmth@gmail.com>
Date: Fri, 31 Oct 2025 14:08:32 +0100
From: Christian Marangi <ansuelsmth@...il.com>
To: Ilia Lin <ilia.lin@...nel.org>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	Bjorn Andersson <andersson@...nel.org>,
	Konrad Dybcio <konradybcio@...nel.org>,
	Arnd Bergmann <arnd@...db.de>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Christian Marangi <ansuelsmth@...il.com>,
	Raag Jadav <raag.jadav@...el.com>,
	linux-arm-msm@...r.kernel.org,
	linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 1/3] err.h: add INIT_ERR_PTR macro

Add INIT_ERR_PTR macro to initialize static variables with error
pointers. This might be useful for specific case where there is a static
variable initialized to an error condition and then later set to the
real handle once probe finish/completes.

This is to handle compilation problems like:

error: initializer element is not constant

where ERR_PTR can't be used.

Signed-off-by: Christian Marangi <ansuelsmth@...il.com>
---
 include/linux/err.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/include/linux/err.h b/include/linux/err.h
index 1d60aa86db53..8c37be0620ab 100644
--- a/include/linux/err.h
+++ b/include/linux/err.h
@@ -41,6 +41,14 @@ static inline void * __must_check ERR_PTR(long error)
 	return (void *) error;
 }
 
+/**
+ * INIT_ERR_PTR - Init a const error pointer.
+ * @error: A negative error code.
+ *
+ * Like ERR_PTR(), but usable to initialize static variables.
+ */
+#define INIT_ERR_PTR(error) ((void *)(error))
+
 /* Return the pointer in the percpu address space. */
 #define ERR_PTR_PCPU(error) ((void __percpu *)(unsigned long)ERR_PTR(error))
 
-- 
2.51.0