riscv: Re-introduce global icache flush in patch_text_XXX()

commit edf2d546 ("riscv: patch: Flush the icache right after
patching to avoid illegal insns") mistakenly removed the global icache
flush in patch_text_nosync() and patch_text_set_nosync() functions, so
reintroduce them.

Fixes: edf2d546 ("riscv: patch: Flush the icache right after patching to avoid illegal insns")
Reported-by: Samuel Holland <samuel.holland@sifive.com>
Closes: https://lore.kernel.org/linux-riscv/a28ddc26-d77a-470a-a33f-88144f717e86@sifive.com/Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Reviewed-by: Samuel Holland <samuel.holland@sifive.com>
Reviewed-by: Charlie Jenkins <charlie@rivosinc.com>
Link: https://lore.kernel.org/r/20240801191404.55181-1-alexghiti@rivosinc.comSigned-off-by: Palmer Dabbelt <palmer@rivosinc.com>

arch/riscv/kernel/patch.c

@@ -205,6 +205,8 @@ int patch_text_set_nosync(void *addr, u8 c, size_t len)
 	int ret;
 
 	ret = patch_insn_set(addr, c, len);
+	if (!ret)
+		flush_icache_range((uintptr_t)addr, (uintptr_t)addr + len);
 
 	return ret;
 }
@@ -239,6 +241,8 @@ int patch_text_nosync(void *addr, const void *insns, size_t len)
 	int ret;
 
 	ret = patch_insn_write(addr, insns, len);
+	if (!ret)
+		flush_icache_range((uintptr_t)addr, (uintptr_t)addr + len);
 
 	return ret;
 }