@@ -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.
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. Signed-off-by: Uros Bizjak <ubizjak@gmail.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Andrew Morton <akpm@linux-foundation.org> --- v2: Implement as macros to avoid powerpc build failure --- include/linux/err.h | 9 +++++++++ 1 file changed, 9 insertions(+)