Merge "arm64: alternative: Support memory protection"

#include <asm/cacheflush.h>

#include <asm/alternative.h>

#include <asm/cpufeature.h>

#include <asm/insn.h>

#include <linux/stop_machine.h>

extern struct alt_instr __alt_instructions[], __alt_instructions_end[];

static int __apply_alternatives(void *dummy)

{

	struct alt_instr *alt;

	u8 *origptr, *replptr;

	u32 *origptr, *replptr, *endptr;

	for (alt = __alt_instructions; alt < __alt_instructions_end; alt++) {

		if (!cpus_have_cap(alt->cpufeature))

			continue;

		BUG_ON(alt->alt_len > alt->orig_len);

		BUG_ON(alt->alt_len != alt->orig_len);

		pr_info_once("patching kernel code\n");

		origptr = (u8 *)&alt->orig_offset + alt->orig_offset;

		replptr = (u8 *)&alt->alt_offset + alt->alt_offset;

		memcpy(origptr, replptr, alt->alt_len);

		flush_icache_range((uintptr_t)origptr,

				   (uintptr_t)(origptr + alt->alt_len));

		origptr = (void *)&alt->orig_offset + alt->orig_offset;

		endptr = (void *)origptr + alt->orig_len;

		replptr = (void *)&alt->alt_offset + alt->alt_offset;

		for (; origptr < endptr; origptr++, replptr++)

			BUG_ON(aarch64_insn_patch_text_nosync(origptr, *replptr));

	}

	return 0;