Update Linux to v5.4.2
Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/arch/parisc/include/asm/alternative.h b/arch/parisc/include/asm/alternative.h
new file mode 100644
index 0000000..0ec54f4
--- /dev/null
+++ b/arch/parisc/include/asm/alternative.h
@@ -0,0 +1,60 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __ASM_PARISC_ALTERNATIVE_H
+#define __ASM_PARISC_ALTERNATIVE_H
+
+#define ALT_COND_ALWAYS 0x80 /* always replace instruction */
+#define ALT_COND_NO_SMP 0x01 /* when running UP instead of SMP */
+#define ALT_COND_NO_DCACHE 0x02 /* if system has no d-cache */
+#define ALT_COND_NO_ICACHE 0x04 /* if system has no i-cache */
+#define ALT_COND_NO_SPLIT_TLB 0x08 /* if split_tlb == 0 */
+#define ALT_COND_NO_IOC_FDC 0x10 /* if I/O cache does not need flushes */
+#define ALT_COND_RUN_ON_QEMU 0x20 /* if running on QEMU */
+
+#define INSN_PxTLB 0x02 /* modify pdtlb, pitlb */
+#define INSN_NOP 0x08000240 /* nop */
+
+#ifndef __ASSEMBLY__
+
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/stddef.h>
+#include <linux/stringify.h>
+
+struct alt_instr {
+ s32 orig_offset; /* offset to original instructions */
+ s32 len; /* end of original instructions */
+ u32 cond; /* see ALT_COND_XXX */
+ u32 replacement; /* replacement instruction or code */
+};
+
+void set_kernel_text_rw(int enable_read_write);
+void apply_alternatives_all(void);
+void apply_alternatives(struct alt_instr *start, struct alt_instr *end,
+ const char *module_name);
+
+/* Alternative SMP implementation. */
+#define ALTERNATIVE(cond, replacement) "!0:" \
+ ".section .altinstructions, \"aw\" !" \
+ ".word (0b-4-.), 1, " __stringify(cond) "," \
+ __stringify(replacement) " !" \
+ ".previous"
+
+#else
+
+/* to replace one single instructions by a new instruction */
+#define ALTERNATIVE(from, to, cond, replacement)\
+ .section .altinstructions, "aw" ! \
+ .word (from - .), (to - from)/4 ! \
+ .word cond, replacement ! \
+ .previous
+
+/* to replace multiple instructions by new code */
+#define ALTERNATIVE_CODE(from, num_instructions, cond, new_instr_ptr)\
+ .section .altinstructions, "aw" ! \
+ .word (from - .), -num_instructions ! \
+ .word cond, (new_instr_ptr - .) ! \
+ .previous
+
+#endif /* __ASSEMBLY__ */
+
+#endif /* __ASM_PARISC_ALTERNATIVE_H */