linux-hardening - [PATCH v6 2/2] lib/string: shrink lib/string.i via IWYU

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Message-ID: <20231226-libstringheader-v6-2-80aa08c7652c@google.com>
Date: Tue, 26 Dec 2023 18:00:01 +0000
From: Tanzir Hasan <tanzirh@...gle.com>
To: Kees Cook <keescook@...omium.org>, Nick Desaulniers <nnn@...gle.com>
Cc: Andy Shevchenko <andy@...nel.org>, linux-hardening@...r.kernel.org, 
	linux-kernel@...r.kernel.org, Andrew Morton <akpm@...ux-foundation.org>, 
	Greg KH <gregkh@...uxfoundation.org>, llvm@...ts.linux.dev, 
	Tanzir Hasan <tanzirh@...gle.com>
Subject: [PATCH v6 2/2] lib/string: shrink lib/string.i via IWYU

This diff uses an open source tool include-what-you-use (IWYU) to modify
the include list, changing indirect includes to direct includes. IWYU is
implemented using the IWYUScripts github repository which is a tool that
is currently undergoing development. These changes seek to improve build
times.

This change to lib/string.c resulted in a preprocessed size of
lib/string.i from 26371 lines to 5321 lines (-80%) for the x86
defconfig.

Link: https://github.com/ClangBuiltLinux/IWYUScripts
Reviewed-by: Kees Cook <keescook@...omium.org>
Signed-off-by: Tanzir Hasan <tanzirh@...gle.com>
---
 lib/string.c | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

diff --git a/lib/string.c b/lib/string.c
index be26623953d2..06d9b46875ef 100644
--- a/lib/string.c
+++ b/lib/string.c
@@ -15,19 +15,20 @@
  */
 
 #define __NO_FORTIFY
-#include <linux/types.h>
-#include <linux/string.h>
-#include <linux/ctype.h>
-#include <linux/kernel.h>
-#include <linux/export.h>
+#include <linux/bits.h>
 #include <linux/bug.h>
+#include <linux/ctype.h>
 #include <linux/errno.h>
-#include <linux/slab.h>
+#include <linux/limits.h>
+#include <linux/linkage.h>
+#include <linux/stddef.h>
+#include <linux/string.h>
+#include <linux/types.h>
 
+#include <asm/page.h>
+#include <asm/rwonce.h>
 #include <asm/unaligned.h>
-#include <asm/byteorder.h>
 #include <asm/word-at-a-time.h>
-#include <asm/page.h>
 
 #ifndef __HAVE_ARCH_STRNCASECMP
 /**

-- 
2.43.0.472.g3155946c3a-goog