riscv: Simplify text patching loops

This reduces the number of variables and makes the code easier to parse.

Signed-off-by: Samuel Holland <samuel.holland@sifive.com>
Reviewed-by: Björn Töpel <bjorn@rivosinc.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20240327160520.791322-5-samuel.holland@sifive.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>

Author: SiFiveHolland

arch/riscv/kernel/patch.c

@@ -163,22 +163,24 @@ NOKPROBE_SYMBOL(__patch_insn_write);
 
 static int patch_insn_set(void *addr, u8 c, size_t len)
 {
-	size_t patched = 0;
 	size_t size;
-	int ret = 0;
+	int ret;
 
 	/*
 	 * __patch_insn_set() can only work on 2 pages at a time so call it in a
 	 * loop with len <= 2 * PAGE_SIZE.
 	 */
-	while (patched < len && !ret) {
-		size = min_t(size_t, PAGE_SIZE * 2 - offset_in_page(addr + patched), len - patched);
-		ret = __patch_insn_set(addr + patched, c, size);
-
-		patched += size;
+	while (len) {
+		size = min(len, PAGE_SIZE * 2 - offset_in_page(addr));
+		ret = __patch_insn_set(addr, c, size);
+		if (ret)
+			return ret;
+
+		addr += size;
+		len -= size;
 	}
 
-	return ret;
+	return 0;
 }
 NOKPROBE_SYMBOL(patch_insn_set);
 
@@ -198,22 +200,25 @@ NOKPROBE_SYMBOL(patch_text_set_nosync);
 
 int patch_insn_write(void *addr, const void *insn, size_t len)
 {
-	size_t patched = 0;
 	size_t size;
-	int ret = 0;
+	int ret;
 
 	/*
 	 * Copy the instructions to the destination address, two pages at a time
 	 * because __patch_insn_write() can only handle len <= 2 * PAGE_SIZE.
 	 */
-	while (patched < len && !ret) {
-		size = min_t(size_t, PAGE_SIZE * 2 - offset_in_page(addr + patched), len - patched);
-		ret = __patch_insn_write(addr + patched, insn + patched, size);
-
-		patched += size;
+	while (len) {
+		size = min(len, PAGE_SIZE * 2 - offset_in_page(addr));
+		ret = __patch_insn_write(addr, insn, size);
+		if (ret)
+			return ret;
+
+		addr += size;
+		insn += size;
+		len -= size;
 	}
 
-	return ret;
+	return 0;
 }
 NOKPROBE_SYMBOL(patch_insn_write);