Commit a759e37f authored by Uros Bizjak's avatar Uros Bizjak Committed by Andrew Morton
Browse files

err.h: add ERR_PTR_PCPU(), PTR_ERR_PCPU() and IS_ERR_PCPU() macros 

Add ERR_PTR_PCPU(), PTR_ERR_PCPU() and IS_ERR_PCPU() macros that operate
on pointers in the percpu address space.

These macros remove the need for (__force void *) function argument casts
(to avoid sparse -Wcast-from-as warnings).

The patch will also avoid future build errors due to pointer address space
mismatch with enabled strict percpu address space checks.

Link: https://lkml.kernel.org/r/20240818210235.33481-1-ubizjak@gmail.com


Signed-off-by: default avatarUros Bizjak <ubizjak@gmail.com>
Acked-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent 2f4db286

include/linux/err.h

+9 −0
Original line number Diff line number Diff line
@@ -41,6 +41,9 @@ static inline void * __must_check ERR_PTR(long error) 
	return (void *) error;

}



/* Return the pointer in the percpu address space. */

#define ERR_PTR_PCPU(error) ((void __percpu *)(unsigned long)ERR_PTR(error))



/**

 * PTR_ERR - Extract the error code from an error pointer.

 * @ptr: An error pointer.
@@ -51,6 +54,9 @@ static inline long __must_check PTR_ERR(__force const void *ptr) 
	return (long) ptr;

}



/* Read an error pointer from the percpu address space. */

#define PTR_ERR_PCPU(ptr) (PTR_ERR((const void *)(__force const unsigned long)(ptr)))



/**

 * IS_ERR - Detect an error pointer.

 * @ptr: The pointer to check.
@@ -61,6 +67,9 @@ static inline bool __must_check IS_ERR(__force const void *ptr) 
	return IS_ERR_VALUE((unsigned long)ptr);

}



/* Read an error pointer from the percpu address space. */

#define IS_ERR_PCPU(ptr) (IS_ERR((const void *)(__force const unsigned long)(ptr)))



/**

 * IS_ERR_OR_NULL - Detect an error pointer or a null pointer.

 * @ptr: The pointer to check.