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atm: idt77252: fix build broken on amd64

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idt77252 is broken and wont load on amd64 systems
  modprobe idt77252 shows the following

    idt77252_init: skb->cb is too small (48 < 56)

  Add packed attribute to struct idt77252_skb_prv and struct atm_skb_data
  so that the total size can be <= sizeof(skb->cb)
  Also convert runtime size check to buildtime size check in
  idt77252_init()

Signed-off-by: Tong Zhang <ztong0001@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tong Zhang
2021-02-14 18:43:08 -05:00
committed by David S. Miller
parent 57baf8cc70
commit d0a0bbe7b0
3 changed files with 3 additions and 12 deletions
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2
include/linux/atmdev.h
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@@ -207,7 +207,7 @@ struct atm_skb_data {
struct atm_vcc *vcc; /* ATM VCC */
unsigned long atm_options; /* ATM layer options */
unsigned int acct_truesize; /* truesize accounted to vcc */
};
} __packed;
#define VCC_HTABLE_SIZE 32