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

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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: Uros Bizjak <ubizjak@gmail.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Uros Bizjak 2024-08-18 23:01:51 +02:00 committed by Andrew Morton
parent 2f4db28610
commit a759e37fb4
1 changed files with 9 additions and 0 deletions
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9
include/linux/err.h
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@ -41,6 +41,9 @@ static inline void * __must_check ERR_PTR(long error)
return (void *) 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_ERR - Extract the error code from an error pointer.
* @ptr: 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; 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. * IS_ERR - Detect an error pointer.
* @ptr: The pointer to check. * @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); 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. * IS_ERR_OR_NULL - Detect an error pointer or a null pointer.
* @ptr: The pointer to check. * @ptr: The pointer to check.