Re: [PATCH RFC 07/19] perf tools: Workaround missing maps for x86_64 KPTI entry trampolines

[Jiri Olsa]

On Wed, May 09, 2018 at 02:43:36PM +0300, Adrian Hunter wrote:

SNIP

> +
> +	for (i = 0; i < ARRAY_SIZE(syms); i++) {
> +		if (syms[i].addr)
> +			return syms[i].addr;
> +	}
> +
> +	return 0;
> +}
> +
> +/*
> + * These values can be used for kernels that do not have symbols for the entry
> + * trampolines in kallsyms.
> + */
> +#define X86_64_CPU_ENTRY_AREA_PER_CPU	0xfffffe0000000000ULL
> +#define X86_64_CPU_ENTRY_AREA_SIZE	0x2c000
> +#define X86_64_ENTRY_TRAMPOLINE		0x6000
> +
> +/* Map x86_64 KPTI entry trampolines */
> +int machine__map_x86_64_entry_trampolines(struct machine *machine,
> +					  struct dso *kernel)
> +{

would it make sense to put all this under arch/x86/util/machine.c ?

jirka