Re: [PATCH] Linux Kernel Markers 0.13 for 2.6.17

[Jeremy Fitzhardinge <jeremy@goop.org>]

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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