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    Subjectsizeof problem in kernel modules
    Date

    Hi !

    can someone explain to me whats happening here ?

    --simple.c--
    #include <linux/module.h>
    #include <linux/kernel.h>

    struct { short x; long y; short z; }bad_struct;
    struct { long y; short x; short z; }good_struct;

    int init_module(void){
    printk("good_struct %d, bad_struct %d\n",sizeof(good_struct),sizeof(bad_struct));
    return 0;
    }

    void cleanup_module(void){
    }

    --Makefile--

    all: simple.o

    CC= gcc
    CFLAGS= -pipe -fno-strength-reduce -DCPU=686 -march=i686 \
    -Wall -Wstrict-prototypes -g -D__KERNEL__ -DMODULE \
    -D_LOOSE_KERNEL_NAMES -O2 -c
    INCLUDE= -I/usr/include/linux

    clean:
    rm -f simple.o

    ---------------------------------------------------------------

    I would expect both structs to be 8byte in size , or atleast the same size !
    but good_struct turns out to be 8bytes and bad_struct 12 .

    what am I doing wrong here ?

    thx !
    hofrat
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