Re: [PATCH v4 1/5] powerpc: Refactor kexec functions to move arch independent code to IMA

Thiago Jung Bauermann
2020-08-28T01:24:16Z

Lakshmi Ramasubramanian <nramas@linux.microsoft.com> writes:

> +/**
> + * ima_get_kexec_buffer - get IMA buffer from the previous kernel
> + * @addr: On successful return, set to point to the buffer contents.
> + * @size: On successful return, set to the buffer size.
> + *
> + * Return: 0 on success, negative errno on error.
> + */
> +int ima_get_kexec_buffer(void **addr, size_t *size)

I just noticed that this function is only called from within
ima_kexec.c, so it can be made static.

> +{
> + int ret, len;
> + unsigned long tmp_addr;
> + size_t tmp_size;
> + const void *prop;
> +
> + prop = of_get_property(of_chosen, FDT_PROP_IMA_KEXEC_BUFFER, &len);
> + if (!prop)
> + return -ENOENT;
> +
> + ret = do_get_kexec_buffer(prop, len, &tmp_addr, &tmp_size);
> + if (ret)
> + return ret;
> +
> + *addr = __va(tmp_addr);
> + *size = tmp_size;
> +
> + return 0;
> +}
> +
> +/**
> + * ima_free_kexec_buffer - free memory used by the IMA buffer
> + */
> +int ima_free_kexec_buffer(void)

This one can be static as well.

> +{
> + int ret;
> + unsigned long addr;
> + size_t size;
> + struct property *prop;
> +
> + prop = of_find_property(of_chosen, FDT_PROP_IMA_KEXEC_BUFFER, NULL);
> + if (!prop)
> + return -ENOENT;
> +
> + ret = do_get_kexec_buffer(prop->value, prop->length, &addr, &size);
> + if (ret)
> + return ret;
> +
> + ret = of_remove_property(of_chosen, prop);
> + if (ret)
> + return ret;
> +
> + return memblock_free(addr, size);
> +
> +}
> +
> #ifdef CONFIG_IMA_KEXEC
> static int ima_dump_measurement_list(unsigned long *buffer_size, void **buffer,
> unsigned long segment_size)

--
Thiago Jung Bauermann
IBM Linux Technology Center