[Xen-devel] PACKED in structure is xen.h - newbie (OT)

["sting sting" <zstingx@xxxxxxxxxxx>]

Hello ,

I am trying to learn a liitle about Xen by reading the source code.

I see that 'PACKED' appears in many structures;

for example :  in xen/include/public/xen.h:

typedef struct
{
   memory_t ptr;    /* Machine address of PTE. */
   memory_t val;    /* New contents of PTE.    */
} PACKED mmu_update_t;


What is this 'PACKED'? is it  the __attribute__ ((__packed__)) of gcc (or 
something near)?
Is there somewhere  a macro in Xen which defines it?  (or is it a part of 
some gcc extension?)
Regards,
Sting

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