linux-kernel - [PATCH v2] x86/vdso: shrink vdso/extable.i via IWYU

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Date: Thu, 04 Jan 2024 00:02:40 +0000
From: Tanzir Hasan <tanzirh@...gle.com>
To: Andy Lutomirski <luto@...nel.org>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, 
	Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org, 
	"H. Peter Anvin" <hpa@...or.com>
Cc: Nick Desaulniers <nnn@...gle.com>, linux-kernel@...r.kernel.org, 
	Nick Desaulniers <ndesaulniers@...gle.com>, Tanzir Hasan <tanzirh@...gle.com>
Subject: [PATCH v2] x86/vdso: shrink vdso/extable.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 vdso/extable.c resulted in a preprocessed size of
vdso/extable.i from 64332 lines to 25563 lines (-61%) for the x86
defconfig.

Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>
Tested-by: Nick Desaulniers <ndesaulniers@...gle.com>
Signed-off-by: Tanzir Hasan <tanzirh@...gle.com>
---
Changes in v2:
- Removed struct forward declaration
- Removed linux/mm for a more aggressive cut
- Link to v1: https://lore.kernel.org/r/20231228-extable-v1-1-32a18c66b440@google.com
---
 arch/x86/entry/vdso/extable.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/arch/x86/entry/vdso/extable.c b/arch/x86/entry/vdso/extable.c
index afcf5b65beef..85e3babdd976 100644
--- a/arch/x86/entry/vdso/extable.c
+++ b/arch/x86/entry/vdso/extable.c
@@ -1,8 +1,12 @@
 // SPDX-License-Identifier: GPL-2.0
-#include <linux/err.h>
-#include <linux/mm.h>
+#include <linux/mm_types.h>
+#include <linux/sched.h>
+#include <linux/stddef.h>
+#include <linux/types.h>
+
 #include <asm/current.h>
-#include <asm/traps.h>
+#include <asm/ptrace.h>
+#include <asm/trapnr.h>
 #include <asm/vdso.h>
 
 struct vdso_exception_table_entry {

---
base-commit: f5837722ffecbbedf1b1dbab072a063565f0dad1
change-id: 20231228-extable-18f095e0aeba

Best regards,
-- 
Tanzir Hasan <tanzirh@...gle.com>