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Message-ID: <20231218-libstringheader-v3-1-500bd58f0f75@google.com>
Date: Mon, 18 Dec 2023 18:44:47 +0000
From: tanzirh@...gle.com
To: Kees Cook <keescook@...omium.org>
Cc: Andy Shevchenko <andy@...nel.org>, linux-hardening@...r.kernel.org,
linux-kernel@...r.kernel.org, Nick DeSaulniers <nnn@...gle.com>,
Andrew Morton <akpm@...ux-foundation.org>, llvm@...ts.linux.dev,
Al Viro <viro@...iv.linux.org.uk>, Andy Shevchenko <andy.shevchenko@...il.com>,
Tanzir Hasan <tanzirh@...gle.com>
Subject: [PATCH v3 1/2] kernel.h: removed REPEAT_BYTE from kernel.h
This patch creates wordpart.h and includes it in asm/word-at-a-time.h
for the all architectures. WORD_AT_A_TIME_CONSTANTS depends on kernel.h
because of REPEAT_BYTE. Moving this to another header and including it
where necessary allows us to not include the bloated kernel.h. Making
this implicit dependancy on REPEAT_BYTE explicit allows for later
improvements in the lib/string.c inclusion list.
Suggested-by: Al Viro <viro@...iv.linux.org.uk>
Suggested-by: Andy Shevchenko <andy.shevchenko@...il.com>
Signed-off-by: Tanzir Hasan <tanzirh@...gle.com>
---
arch/arm/include/asm/word-at-a-time.h | 1 +
arch/arm64/include/asm/word-at-a-time.h | 1 +
arch/powerpc/include/asm/word-at-a-time.h | 1 +
arch/riscv/include/asm/word-at-a-time.h | 1 +
arch/s390/include/asm/word-at-a-time.h | 1 +
arch/sh/include/asm/word-at-a-time.h | 2 ++
arch/x86/include/asm/word-at-a-time.h | 1 +
fs/namei.c | 2 +-
include/asm-generic/word-at-a-time.h | 1 +
include/linux/kernel.h | 7 -------
include/linux/wordpart.h | 17 +++++++++++++++++
11 files changed, 27 insertions(+), 8 deletions(-)
diff --git a/arch/arm/include/asm/word-at-a-time.h b/arch/arm/include/asm/word-at-a-time.h
index 352ab213520d..aea6bfe259f5 100644
--- a/arch/arm/include/asm/word-at-a-time.h
+++ b/arch/arm/include/asm/word-at-a-time.h
@@ -9,6 +9,7 @@
* Heavily based on the x86 algorithm.
*/
#include <linux/kernel.h>
+#include <linux/wordpart.h>
struct word_at_a_time {
const unsigned long one_bits, high_bits;
diff --git a/arch/arm64/include/asm/word-at-a-time.h b/arch/arm64/include/asm/word-at-a-time.h
index f3b151ed0d7a..cf8c28a3bba9 100644
--- a/arch/arm64/include/asm/word-at-a-time.h
+++ b/arch/arm64/include/asm/word-at-a-time.h
@@ -10,6 +10,7 @@
#ifndef __AARCH64EB__
#include <linux/kernel.h>
+#include <linux/wordpart.h>
struct word_at_a_time {
const unsigned long one_bits, high_bits;
diff --git a/arch/powerpc/include/asm/word-at-a-time.h b/arch/powerpc/include/asm/word-at-a-time.h
index 30a12d208687..032a77d324e6 100644
--- a/arch/powerpc/include/asm/word-at-a-time.h
+++ b/arch/powerpc/include/asm/word-at-a-time.h
@@ -6,6 +6,7 @@
*/
#include <linux/kernel.h>
+#include <linux/wordpart.h>
#include <asm/asm-compat.h>
#include <asm/extable.h>
diff --git a/arch/riscv/include/asm/word-at-a-time.h b/arch/riscv/include/asm/word-at-a-time.h
index 7c086ac6ecd4..9b7ea4c1a616 100644
--- a/arch/riscv/include/asm/word-at-a-time.h
+++ b/arch/riscv/include/asm/word-at-a-time.h
@@ -10,6 +10,7 @@
#include <linux/kernel.h>
+#include <linux/wordpart.h>
struct word_at_a_time {
const unsigned long one_bits, high_bits;
diff --git a/arch/s390/include/asm/word-at-a-time.h b/arch/s390/include/asm/word-at-a-time.h
index 2579f1694b82..5af1d267b4d7 100644
--- a/arch/s390/include/asm/word-at-a-time.h
+++ b/arch/s390/include/asm/word-at-a-time.h
@@ -3,6 +3,7 @@
#define _ASM_WORD_AT_A_TIME_H
#include <linux/kernel.h>
+#include <linux/wordpart.h>
#include <asm/asm-extable.h>
#include <asm/bitsperlong.h>
diff --git a/arch/sh/include/asm/word-at-a-time.h b/arch/sh/include/asm/word-at-a-time.h
index 4aa398455b94..3a11158f0143 100644
--- a/arch/sh/include/asm/word-at-a-time.h
+++ b/arch/sh/include/asm/word-at-a-time.h
@@ -5,6 +5,8 @@
#ifdef CONFIG_CPU_BIG_ENDIAN
# include <asm-generic/word-at-a-time.h>
#else
+#include <linux/kernel.h>
+#include <linux/wordpart.h>
/*
* Little-endian version cribbed from x86.
*/
diff --git a/arch/x86/include/asm/word-at-a-time.h b/arch/x86/include/asm/word-at-a-time.h
index 46b4f1f7f354..c002c864a63e 100644
--- a/arch/x86/include/asm/word-at-a-time.h
+++ b/arch/x86/include/asm/word-at-a-time.h
@@ -3,6 +3,7 @@
#define _ASM_WORD_AT_A_TIME_H
#include <linux/kernel.h>
+#include <linux/wordpart.h>
/*
* This is largely generic for little-endian machines, but the
diff --git a/fs/namei.c b/fs/namei.c
index 71c13b2990b4..03db8ca3f394 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -17,7 +17,7 @@
#include <linux/init.h>
#include <linux/export.h>
-#include <linux/kernel.h>
+#include <linux/wordpart.h>
#include <linux/slab.h>
#include <linux/fs.h>
#include <linux/filelock.h>
diff --git a/include/asm-generic/word-at-a-time.h b/include/asm-generic/word-at-a-time.h
index 95a1d214108a..fc007fda0b2e 100644
--- a/include/asm-generic/word-at-a-time.h
+++ b/include/asm-generic/word-at-a-time.h
@@ -3,6 +3,7 @@
#define _ASM_WORD_AT_A_TIME_H
#include <linux/kernel.h>
+#include <linux/wordpart.h>
#include <asm/byteorder.h>
#ifdef __BIG_ENDIAN
diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index d9ad21058eed..162660af5b7d 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -39,13 +39,6 @@
#define STACK_MAGIC 0xdeadbeef
-/**
- * REPEAT_BYTE - repeat the value @x multiple times as an unsigned long value
- * @x: value to repeat
- *
- * NOTE: @x is not checked for > 0xff; larger values produce odd results.
- */
-#define REPEAT_BYTE(x) ((~0ul / 0xff) * (x))
/* generic data direction definitions */
#define READ 0
diff --git a/include/linux/wordpart.h b/include/linux/wordpart.h
new file mode 100644
index 000000000000..6a5ed5d54ba2
--- /dev/null
+++ b/include/linux/wordpart.h
@@ -0,0 +1,17 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2023 Google LLC <tanzirh@...gle.com>
+ */
+
+#ifndef _LINUX_WORDPART_H
+#define _LINUX_WORDPART_H
+/**
+ * REPEAT_BYTE - repeat the value @x multiple times as an unsigned long value
+ * @x: value to repeat
+ *
+ * NOTE: @x is not checked for > 0xff; larger values produce odd results.
+ */
+#define REPEAT_BYTE(x) ((~0ul / 0xff) * (x))
+
+#endif // _LINUX_WORDPART_H
+
--
2.43.0.472.g3155946c3a-goog
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