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Date: Thu, 31 Jan 2008 09:57:31 -0600
From: James Bottomley <James.Bottomley@...senPartnership.com>
To: Sam Ravnborg <sam@...nborg.org>
Cc: Adrian Bunk <bunk@...nel.org>, davem@...emloft.net,
linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-arch@...r.kernel.org,
"Maciej W. Rozycki" <macro@...ux-mips.org>
Subject: [PATCH] kill hotplug init/exit section annotations
No-one seems to see much value in these, and they cause about 90% of our
problems with __init/__exit markers, so simply eliminate them. Rather
than run over the whole tree removing them, this patch #defines them to
be nops.
Signed-off-by: James Bottomley <James.Bottomley@...senPartnership.com>
---
I'll probably be going after __exit after this one, but it makes sense
to split them up, since the hotplug annotation removal looks
uncontroversial, whereas __exit and discard section removal might
produce more robust debate. I also think doing the hotplug removal
gives us 90% of the benefits and removes 90% of the section mismatch
problems.
James
diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
index f784d2f..5099021 100644
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -9,46 +9,11 @@
/* Align . to a 8 byte boundary equals to maximum function alignment. */
#define ALIGN_FUNCTION() . = ALIGN(8)
-/* The actual configuration determine if the init/exit sections
- * are handled as text/data or they can be discarded (which
- * often happens at runtime)
- */
-#ifdef CONFIG_HOTPLUG
-#define DEV_KEEP(sec) *(.dev##sec)
-#define DEV_DISCARD(sec)
-#else
-#define DEV_KEEP(sec)
-#define DEV_DISCARD(sec) *(.dev##sec)
-#endif
-
-#ifdef CONFIG_HOTPLUG_CPU
-#define CPU_KEEP(sec) *(.cpu##sec)
-#define CPU_DISCARD(sec)
-#else
-#define CPU_KEEP(sec)
-#define CPU_DISCARD(sec) *(.cpu##sec)
-#endif
-
-#if defined(CONFIG_MEMORY_HOTPLUG)
-#define MEM_KEEP(sec) *(.mem##sec)
-#define MEM_DISCARD(sec)
-#else
-#define MEM_KEEP(sec)
-#define MEM_DISCARD(sec) *(.mem##sec)
-#endif
-
-
/* .data section */
#define DATA_DATA \
*(.data) \
*(.data.init.refok) \
*(.ref.data) \
- DEV_KEEP(init.data) \
- DEV_KEEP(exit.data) \
- CPU_KEEP(init.data) \
- CPU_KEEP(exit.data) \
- MEM_KEEP(init.data) \
- MEM_KEEP(exit.data) \
. = ALIGN(8); \
VMLINUX_SYMBOL(__start___markers) = .; \
*(__markers) \
@@ -171,12 +136,6 @@
/* __*init sections */ \
__init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) { \
*(.ref.rodata) \
- DEV_KEEP(init.rodata) \
- DEV_KEEP(exit.rodata) \
- CPU_KEEP(init.rodata) \
- CPU_KEEP(exit.rodata) \
- MEM_KEEP(init.rodata) \
- MEM_KEEP(exit.rodata) \
} \
\
/* Built-in module parameters. */ \
@@ -208,12 +167,6 @@
*(.ref.text) \
*(.text.init.refok) \
*(.exit.text.refok) \
- DEV_KEEP(init.text) \
- DEV_KEEP(exit.text) \
- CPU_KEEP(init.text) \
- CPU_KEEP(exit.text) \
- MEM_KEEP(init.text) \
- MEM_KEEP(exit.text)
/* sched.text is aling to function alignment to secure we have same
@@ -241,33 +194,15 @@
/* init and exit section handling */
#define INIT_DATA \
*(.init.data) \
- DEV_DISCARD(init.data) \
- DEV_DISCARD(init.rodata) \
- CPU_DISCARD(init.data) \
- CPU_DISCARD(init.rodata) \
- MEM_DISCARD(init.data) \
- MEM_DISCARD(init.rodata)
#define INIT_TEXT \
*(.init.text) \
- DEV_DISCARD(init.text) \
- CPU_DISCARD(init.text) \
- MEM_DISCARD(init.text)
#define EXIT_DATA \
*(.exit.data) \
- DEV_DISCARD(exit.data) \
- DEV_DISCARD(exit.rodata) \
- CPU_DISCARD(exit.data) \
- CPU_DISCARD(exit.rodata) \
- MEM_DISCARD(exit.data) \
- MEM_DISCARD(exit.rodata)
#define EXIT_TEXT \
*(.exit.text) \
- DEV_DISCARD(exit.text) \
- CPU_DISCARD(exit.text) \
- MEM_DISCARD(exit.text)
/* DWARF debug sections.
Symbols in the DWARF debugging sections are relative to
diff --git a/include/linux/init.h b/include/linux/init.h
index 2efbda0..225bd1c 100644
--- a/include/linux/init.h
+++ b/include/linux/init.h
@@ -81,29 +81,28 @@
#define __exit __section(.exit.text) __exitused __cold
-/* Used for HOTPLUG */
-#define __devinit __section(.devinit.text) __cold
-#define __devinitdata __section(.devinit.data)
-#define __devinitconst __section(.devinit.rodata)
-#define __devexit __section(.devexit.text) __exitused __cold
-#define __devexitdata __section(.devexit.data)
-#define __devexitconst __section(.devexit.rodata)
-
-/* Used for HOTPLUG_CPU */
-#define __cpuinit __section(.cpuinit.text) __cold
-#define __cpuinitdata __section(.cpuinit.data)
-#define __cpuinitconst __section(.cpuinit.rodata)
-#define __cpuexit __section(.cpuexit.text) __exitused __cold
-#define __cpuexitdata __section(.cpuexit.data)
-#define __cpuexitconst __section(.cpuexit.rodata)
+/* Legacy: originally used for HOTPLUG */
+#define __devinit
+#define __devinitdata
+#define __devinitconst
+#define __devexit
+#define __devexitdata
+#define __devexitconst
+
+#define __cpuinit
+#define __cpuinitdata
+#define __cpuinitconst
+#define __cpuexit
+#define __cpuexitdata
+#define __cpuexitconst
/* Used for MEMORY_HOTPLUG */
-#define __meminit __section(.meminit.text) __cold
-#define __meminitdata __section(.meminit.data)
-#define __meminitconst __section(.meminit.rodata)
-#define __memexit __section(.memexit.text) __exitused __cold
-#define __memexitdata __section(.memexit.data)
-#define __memexitconst __section(.memexit.rodata)
+#define __meminit
+#define __meminitdata
+#define __meminitconst
+#define __memexit
+#define __memexitdata
+#define __memexitconst
/* For assembly routines */
#define __INIT .section ".init.text","ax"
@@ -111,14 +110,14 @@
#define __INITDATA .section ".init.data","aw"
-#define __DEVINIT .section ".devinit.text", "ax"
-#define __DEVINITDATA .section ".devinit.data", "aw"
+#define __DEVINIT
+#define __DEVINITDATA
-#define __CPUINIT .section ".cpuinit.text", "ax"
-#define __CPUINITDATA .section ".cpuinit.data", "aw"
+#define __CPUINIT
+#define __CPUINITDATA
-#define __MEMINIT .section ".meminit.text", "ax"
-#define __MEMINITDATA .section ".meminit.data", "aw"
+#define __MEMINIT
+#define __MEMINITDATA
/* silence warnings when references are OK */
#define __REF .section ".ref.text", "ax"
--
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