1 files changed, 1 insertions, 52 deletions

diff --git a/arch/arm64/kernel/alternative.c b/arch/arm64/kernel/alternative.c
index 21033bba9390..28f8365edc4c 100644
--- a/arch/arm64/kernel/alternative.c
+++ b/arch/arm64/kernel/alternative.c
@@ -24,7 +24,6 @@
 #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[];
@@ -34,48 +33,6 @@ struct alt_region {
         struct alt_instr *end;
 };
 
-/*
- * Decode the imm field of a b/bl instruction, and return the byte
- * offset as a signed value (so it can be used when computing a new
- * branch target).
- */
-static s32 get_branch_offset(u32 insn)
-{
-        s32 imm = aarch64_insn_decode_immediate(AARCH64_INSN_IMM_26, insn);
-
-        /* sign-extend the immediate before turning it into a byte offset */
-        return (imm << 6) >> 4;
-}
-
-static u32 get_alt_insn(u8 *insnptr, u8 *altinsnptr)
-{
-        u32 insn;
-
-        aarch64_insn_read(altinsnptr, &insn);
-
-        /* Stop the world on instructions we don't support... */
-        BUG_ON(aarch64_insn_is_cbz(insn));
-        BUG_ON(aarch64_insn_is_cbnz(insn));
-        BUG_ON(aarch64_insn_is_bcond(insn));
-        /* ... and there is probably more. */
-
-        if (aarch64_insn_is_b(insn) || aarch64_insn_is_bl(insn)) {
-                enum aarch64_insn_branch_type type;
-                unsigned long target;
-
-                if (aarch64_insn_is_b(insn))
-                        type = AARCH64_INSN_BRANCH_NOLINK;
-                else
-                        type = AARCH64_INSN_BRANCH_LINK;
-
-                target = (unsigned long)altinsnptr + get_branch_offset(insn);
-                insn = aarch64_insn_gen_branch_imm((unsigned long)insnptr,
-                                                   target, type);
-        }
-
-        return insn;
-}
-
 static int __apply_alternatives(void *alt_region)
 {
         struct alt_instr *alt;
@@ -83,9 +40,6 @@ static int __apply_alternatives(void *alt_region)
         u8 *origptr, *replptr;
 
         for (alt = region->begin; alt < region->end; alt++) {
-                u32 insn;
-                int i;
-
                 if (!cpus_have_cap(alt->cpufeature))
                         continue;
 
@@ -95,12 +49,7 @@ static int __apply_alternatives(void *alt_region)
 
                 origptr = (u8 *)&alt->orig_offset + alt->orig_offset;
                 replptr = (u8 *)&alt->alt_offset + alt->alt_offset;
-
-                for (i = 0; i < alt->alt_len; i += sizeof(insn)) {
-                        insn = get_alt_insn(origptr + i, replptr + i);
-                        aarch64_insn_write(origptr + i, insn);
-                }
-
+                memcpy(origptr, replptr, alt->alt_len);
                 flush_icache_range((uintptr_t)origptr,
                                    (uintptr_t)(origptr + alt->alt_len));
         }