How to determine if a struct is packed?

[Dan Carpenter <dan.carpenter@xxxxxxxxxx>]

struct my_type {
         uint64_t        base;
         uint8_t         irq;
         uint8_t         numldrv;
         uint8_t         pcibus;
         uint16_t        pcidev;
         uint8_t         pcifun;
         uint16_t        pciid;
         uint16_t        pcivendor;
         uint8_t         pcislot;
         uint32_t        uid;
} __attribute__ ((packed));

Say I have a pointer to a my_type struct.  When I run my code, I
expected that the expr->ctype->ctype.alignment would be 1 but it's 8
because the base struct member is 8 bytes.

regards,
dan carpenter
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