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err.h: add INIT_ERR_PTR() macro

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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@gmail.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20251031130835.7953-2-ansuelsmth@gmail.com
[bjorn: Added () suffix on macro references]
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
This commit is contained in:
Christian Marangi
2025-10-31 14:08:32 +01:00
committed by Bjorn Andersson
parent dc5db35073
commit 652a86b24c
1 changed files with 8 additions and 0 deletions
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8
include/linux/err.h
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@@ -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))