Messages in this thread | | | Date | Thu, 16 Oct 2014 11:34:14 +0200 | From | Greg KH <> | Subject | Re: [PATCH 1/2] drivers/misc/eeprom/men_eeprod: Introduce MEN Board Information EEPROM driver |
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On Thu, Oct 16, 2014 at 10:58:35AM +0200, Wolfram Sang wrote: > > +struct eeprom_data { > > + uint8_t eeprod_id; > > + > > + uint8_t revision[3]; > > + uint32_t serialnr; > > + uint8_t board_model; > > + char hw_name[6]; > > + > > + uint8_t reserved; > > + > > + __be16 prod_date; > > + __be16 rep_date; > > + > > + uint8_t reserved2[4]; > > +}; > > And what if the compiler reorders?
It's not allowed to reorder, but it can add padding wherever it wants to, which if this is a on-device structure, can cause problems. Use __packed to prevent that.
thanks,
greg k-h
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