Hi,
When looking around in the kernel code, I ran into this (hash.h):
u32 btrfs_crc32c(u32 crc, const void *address, unsigned int length);
[...]
static inline u64 btrfs_extref_hash(u64 parent_objectid, const char *name,
int len)
{
return (u64) btrfs_crc32c(parent_objectid, name, len);
}
[...]
What is the "official" behaviour of just stuffing a 64-bit
(parent_objectid) value into a 32-bit function argument (crc)? Does it
get truncated? Does this compile without a warning?
I would expect that the caller should do the housekeeping of deciding
how to transform the 64 bit parent_objectid into some 32 bit value.
--
Hans van Kranenburg
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