lkml.org 
[lkml]   [2002]   [Oct]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[PATCH] Allow compilation with -ffunction-sections

If you compile the kernel with -ffunction-sections, each function gets
put in a section .text.function_name. This collides with our current use
of .text.init. So here's a patch which converts x86 to use .init.text
instead.

I've tested it on x86 and it still frees 120k of ram, so it seems to work.
Other architectures will need to change their vmlinux.lds appropriately,
and may need other changes (arm, m68k seem to use .text.init verbatim).

diff -urpNX dontdiff linux-2.5.43/arch/i386/vmlinux.lds.S linux-2.5.43-willy/arch/i386/vmlinux.lds.S
--- linux-2.5.43/arch/i386/vmlinux.lds.S 2002-10-11 05:23:56.000000000 -0700
+++ linux-2.5.43-willy/arch/i386/vmlinux.lds.S 2002-10-16 06:34:00.000000000 -0700
@@ -41,11 +41,11 @@ SECTIONS

. = ALIGN(4096); /* Init code and data */
__init_begin = .;
- .text.init : { *(.text.init) }
- .data.init : { *(.data.init) }
+ .init.text : { *(.init.text) }
+ .init.data : { *(.init.data) }
. = ALIGN(16);
__setup_start = .;
- .setup.init : { *(.setup.init) }
+ .init.setup : { *(.init.setup) }
__setup_end = .;
__initcall_start = .;
.initcall.init : {
@@ -89,8 +89,8 @@ SECTIONS

/* Sections to be discarded */
/DISCARD/ : {
- *(.text.exit)
- *(.data.exit)
+ *(.exit.text)
+ *(.exit.data)
*(.exitcall.exit)
}

diff -urpNX dontdiff linux-2.5.43/include/linux/init.h linux-2.5.43-willy/include/linux/init.h
--- linux-2.5.43/include/linux/init.h 2002-08-13 19:54:03.000000000 -0700
+++ linux-2.5.43-willy/include/linux/init.h 2002-10-16 06:00:22.000000000 -0700
@@ -93,18 +93,18 @@ extern struct kernel_param __setup_start
* Mark functions and data as being only used at initialization
* or exit time.
*/
-#define __init __attribute__ ((__section__ (".text.init")))
-#define __exit __attribute__ ((unused, __section__(".text.exit")))
-#define __initdata __attribute__ ((__section__ (".data.init")))
-#define __exitdata __attribute__ ((unused, __section__ (".data.exit")))
-#define __initsetup __attribute__ ((unused,__section__ (".setup.init")))
+#define __init __attribute__ ((__section__ (".init.text")))
+#define __exit __attribute__ ((unused, __section__(".exit.text")))
+#define __initdata __attribute__ ((__section__ (".init.data")))
+#define __exitdata __attribute__ ((unused, __section__ (".exit.data")))
+#define __initsetup __attribute__ ((unused,__section__ (".init.setup")))
#define __init_call(level) __attribute__ ((unused,__section__ (".initcall" level ".init")))
#define __exit_call __attribute__ ((unused,__section__ (".exitcall.exit")))

/* For assembly routines */
-#define __INIT .section ".text.init","ax"
+#define __INIT .section ".init.text","ax"
#define __FINIT .previous
-#define __INITDATA .section ".data.init","aw"
+#define __INITDATA .section ".init.data","aw"

/**
* module_init() - driver initialization entry point
--
Revolutions do not require corporate support.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:30    [W:0.109 / U:0.340 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site