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    Subject[POC 06/12] ugly ugly hack
    Date
    Just to have a quick way of seeing that rai-patching works (i.e., once
    we implement rai_load, we'd not expect the output to change). Also,
    inside virtme we can do a quick "gdb vmlinux /proc/kcode" and
    disassemble rai_proc_show to see how the patched function looks.

    Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
    ---
    arch/x86/kernel/rai.c | 40 ++++++++++++++++++++++++++++++++++++++++
    1 file changed, 40 insertions(+)

    diff --git a/arch/x86/kernel/rai.c b/arch/x86/kernel/rai.c
    index 2c6ff06f7a34..819d03a025e3 100644
    --- a/arch/x86/kernel/rai.c
    +++ b/arch/x86/kernel/rai.c
    @@ -37,3 +37,43 @@ update_rai_access(void)
    rai_patch(__start_rai_data, __stop_rai_data);
    mutex_unlock(&text_mutex);
    }
    +
    +#if 1
    +#include <linux/proc_fs.h>
    +#include <linux/seq_file.h>
    +
    +static int one, two;
    +static long three;
    +
    +static int
    +rai_proc_show(struct seq_file *m, void *v) {
    + seq_printf(m, "one: %d, two: %d, three: %ld\n",
    + rai_load(one), rai_load(two), rai_load(three));
    + one = two = three = -1;
    +
    + return 0;
    +}
    +
    +static int
    +rai_proc_open(struct inode *inode, struct file *file) {
    + return single_open(file, rai_proc_show, NULL);
    +}
    +
    +static const struct file_operations rai_proc_fops = {
    + .owner = THIS_MODULE,
    + .open = rai_proc_open,
    + .read = seq_read,
    + .llseek = seq_lseek,
    + .release = single_release,
    +};
    +
    +static int __init rai_proc_init(void) {
    + one = 1;
    + two = 2;
    + three = 3;
    +
    + proc_create("rai", 0, NULL, &rai_proc_fops);
    + return 0;
    +}
    +late_initcall(rai_proc_init);
    +#endif
    --
    2.19.1.6.gbde171bbf5
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