The problem seems likely to be related to odd compiler handling of
alignment. Consider this code bit, which extracts the essentials:
struct x {
int x;
} __attribute__((__aligned__(32)));
struct s1 {
int a;
struct x b[1];
};
struct s2 {
int a;
struct x b[];
};
extern void test2(int);
void test(void) {
test2(sizeof(struct s1));
test2(sizeof(struct s2));
}
Compiled, here are the two sizeof values (this particular compiler
output is from clang but gcc and clang both agree on sizeof here):
movl $64, %edi
callq test2
movl $32, %edi
popq %rbp
jmp test2 # TAILCALL
With the flexible array, (sizeof(struct uma_cache)) is going to be
32 bytes smaller than without it.
(I have not looked closely enough to determine what the size should be.)
Chris
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