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SubjectRe: [PATCH] Linux Kernel Markers 0.13 for 2.6.17
Mathieu Desnoyers wrote:
> +/* Note : max 256 bytes between over_label and near_jump */
> +#define MARK_JUMP(name, format, args...) \
> + do { \
> + asm volatile( ".section .markers, \"a\";\n\t" \
> + ".long 0f, 1f, 2f;\n\t" \
> + ".previous;\n\t" \
> + ".align 16;\n\t" \
> + ".byte 0xeb;\n\t" \
> + "0:\n\t" \
> + ".byte 2f-1f;\n\t" \
> + "1:\n\t" \
> + : "+m" (__marker_sequencer) : ); \
> + MARK_CALL(name, format, ## args); \
> + asm volatile ( "2:\n\t" : "+m" (__marker_sequencer) : ); \
>

Unfortunately this doesn't work either. The two asms are ordered with
respect to each other, but there's nothing to 1) stop the MARK_CALL from
being moved out between them, 2) something else being moved in between
them. I don't really see a way out of this without implementing the
whole call in assembler as well, which is a big pain.

J
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