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XArray: Permit storing 2-byte-aligned pointers

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On m68k, statically allocated pointers may only be two-byte aligned.
This clashes with the XArray's method for tagging internal pointers.
Permit storing these pointers in single slots (ie not in multislots).

Signed-off-by: Matthew Wilcox <willy@infradead.org>
This commit is contained in:
Matthew Wilcox 2018-12-28 23:20:44 -05:00
parent 4a31896c5b
commit 76b4e52995
3 changed files with 58 additions and 12 deletions
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18
include/linux/xarray.h
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@ -176,7 +176,8 @@ static inline bool xa_is_internal(const void *entry)
*/
static inline bool xa_is_err(const void *entry)
{
return unlikely(xa_is_internal(entry));
return unlikely(xa_is_internal(entry) &&
(unsigned long)entry >= -((MAX_ERRNO << 2) + 2));
}
/**
@ -1039,8 +1040,8 @@ static inline bool xa_is_sibling(const void *entry)
(entry < xa_mk_sibling(XA_CHUNK_SIZE - 1));
}
#define XA_ZERO_ENTRY xa_mk_internal(256)
#define XA_RETRY_ENTRY xa_mk_internal(257)
#define XA_RETRY_ENTRY xa_mk_internal(256)
#define XA_ZERO_ENTRY xa_mk_internal(257)
/**
* xa_is_zero() - Is the entry a zero entry?
@ -1064,6 +1065,17 @@ static inline bool xa_is_retry(const void *entry)
return unlikely(entry == XA_RETRY_ENTRY);
}
/**
* xa_is_advanced() - Is the entry only permitted for the advanced API?
* @entry: Entry to be stored in the XArray.
*
* Return: %true if the entry cannot be stored by the normal API.
*/
static inline bool xa_is_advanced(const void *entry)
{
return xa_is_internal(entry) && (entry <= XA_RETRY_ENTRY);
}
/**
* typedef xa_update_node_t - A callback function from the XArray.
* @node: The node which is being processed