From: Tejun Heo Date: Wed, 24 Jun 2009 06:13:38 +0000 (+0900) Subject: linker script: throw away .discard section X-Git-Tag: v2.6.32-rc1~676^2^2~46 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=405d967dc70002991f8fc35c20e0d3cbc7614f63;p=thirdparty%2Fkernel%2Flinux.git linker script: throw away .discard section x86 throws away .discard section but no other archs do. Also, .discard is not thrown away while linking modules. Make every arch and module linking throw it away. This will be used to define dummy variables for percpu declarations and definitions. This patch is based on Ivan Kokshaysky's alpha percpu patch. [ Impact: always throw away everything in .discard ] Signed-off-by: Tejun Heo Cc: Ivan Kokshaysky Cc: Richard Henderson Cc: Russell King Cc: Haavard Skinnemoen Cc: Bryan Wu Cc: Mikael Starvik Cc: Jesper Nilsson Cc: David Howells Cc: Yoshinori Sato Cc: Tony Luck Cc: Hirokazu Takata Cc: Geert Uytterhoeven Cc: Michal Simek Cc: Ralf Baechle Cc: Kyle McMartin Cc: Benjamin Herrenschmidt Cc: Paul Mackerras Cc: Martin Schwidefsky Cc: Heiko Carstens Cc: Paul Mundt Cc: David S. Miller Cc: Jeff Dike Cc: Chris Zankel Cc: Rusty Russell Cc: Ingo Molnar --- diff --git a/Makefile b/Makefile index 46e1c9d03d515..12245be05122c 100644 --- a/Makefile +++ b/Makefile @@ -327,7 +327,7 @@ CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ MODFLAGS = -DMODULE CFLAGS_MODULE = $(MODFLAGS) AFLAGS_MODULE = $(MODFLAGS) -LDFLAGS_MODULE = +LDFLAGS_MODULE = -T $(srctree)/scripts/module-common.lds CFLAGS_KERNEL = AFLAGS_KERNEL = CFLAGS_GCOV = -fprofile-arcs -ftest-coverage diff --git a/arch/alpha/kernel/vmlinux.lds.S b/arch/alpha/kernel/vmlinux.lds.S index b9d6568e5f7f0..75fe1d6877e9e 100644 --- a/arch/alpha/kernel/vmlinux.lds.S +++ b/arch/alpha/kernel/vmlinux.lds.S @@ -139,6 +139,7 @@ SECTIONS EXIT_TEXT EXIT_DATA *(.exitcall.exit) + *(.discard) } .mdebug 0 : { diff --git a/arch/arm/kernel/vmlinux.lds.S b/arch/arm/kernel/vmlinux.lds.S index 6c0779792546d..e256c57b89814 100644 --- a/arch/arm/kernel/vmlinux.lds.S +++ b/arch/arm/kernel/vmlinux.lds.S @@ -82,6 +82,7 @@ SECTIONS EXIT_TEXT EXIT_DATA *(.exitcall.exit) + *(.discard) *(.ARM.exidx.exit.text) *(.ARM.extab.exit.text) #ifndef CONFIG_MMU diff --git a/arch/avr32/kernel/vmlinux.lds.S b/arch/avr32/kernel/vmlinux.lds.S index 7910d41eb8863..b8324608ec0c9 100644 --- a/arch/avr32/kernel/vmlinux.lds.S +++ b/arch/avr32/kernel/vmlinux.lds.S @@ -131,6 +131,7 @@ SECTIONS /DISCARD/ : { EXIT_DATA *(.exitcall.exit) + *(.discard) } DWARF_DEBUG diff --git a/arch/blackfin/kernel/vmlinux.lds.S b/arch/blackfin/kernel/vmlinux.lds.S index 6ac307ca0d805..6e8eabd8f0a6d 100644 --- a/arch/blackfin/kernel/vmlinux.lds.S +++ b/arch/blackfin/kernel/vmlinux.lds.S @@ -280,5 +280,6 @@ SECTIONS /DISCARD/ : { *(.exitcall.exit) + *(.discard) } } diff --git a/arch/cris/kernel/vmlinux.lds.S b/arch/cris/kernel/vmlinux.lds.S index 0d2adfc794d49..a3175ebb38ccf 100644 --- a/arch/cris/kernel/vmlinux.lds.S +++ b/arch/cris/kernel/vmlinux.lds.S @@ -145,6 +145,7 @@ SECTIONS EXIT_TEXT EXIT_DATA *(.exitcall.exit) + *(.discard) } dram_end = dram_start + (CONFIG_ETRAX_DRAM_SIZE - __CONFIG_ETRAX_VMEM_SIZE)*1024*1024; diff --git a/arch/frv/kernel/vmlinux.lds.S b/arch/frv/kernel/vmlinux.lds.S index 22d9787406ed9..64b5a5e4d35e7 100644 --- a/arch/frv/kernel/vmlinux.lds.S +++ b/arch/frv/kernel/vmlinux.lds.S @@ -177,6 +177,8 @@ SECTIONS .debug_ranges 0 : { *(.debug_ranges) } .comment 0 : { *(.comment) } + + /DISCARD/ : { *(.discard) } } __kernel_image_size_no_bss = __bss_start - __kernel_image_start; diff --git a/arch/h8300/kernel/vmlinux.lds.S b/arch/h8300/kernel/vmlinux.lds.S index 43a87b9085b6b..03d6c0df33db4 100644 --- a/arch/h8300/kernel/vmlinux.lds.S +++ b/arch/h8300/kernel/vmlinux.lds.S @@ -154,6 +154,7 @@ SECTIONS } /DISCARD/ : { *(.exitcall.exit) + *(.discard) } .romfs : { diff --git a/arch/ia64/kernel/vmlinux.lds.S b/arch/ia64/kernel/vmlinux.lds.S index 4a95e86b9ac20..13d958975874b 100644 --- a/arch/ia64/kernel/vmlinux.lds.S +++ b/arch/ia64/kernel/vmlinux.lds.S @@ -29,6 +29,7 @@ SECTIONS EXIT_TEXT EXIT_DATA *(.exitcall.exit) + *(.discard) *(.IA_64.unwind.exit.text) *(.IA_64.unwind_info.exit.text) } diff --git a/arch/m32r/kernel/vmlinux.lds.S b/arch/m32r/kernel/vmlinux.lds.S index 4179adf6c624f..480a49944cfd4 100644 --- a/arch/m32r/kernel/vmlinux.lds.S +++ b/arch/m32r/kernel/vmlinux.lds.S @@ -125,6 +125,7 @@ SECTIONS EXIT_TEXT EXIT_DATA *(.exitcall.exit) + *(.discard) } /* Stabs debugging sections. */ diff --git a/arch/m68k/kernel/vmlinux-std.lds b/arch/m68k/kernel/vmlinux-std.lds index 01d212bb05a6e..905a797ada935 100644 --- a/arch/m68k/kernel/vmlinux-std.lds +++ b/arch/m68k/kernel/vmlinux-std.lds @@ -87,6 +87,7 @@ SECTIONS EXIT_TEXT EXIT_DATA *(.exitcall.exit) + *(.discard) } /* Stabs debugging sections. */ diff --git a/arch/m68k/kernel/vmlinux-sun3.lds b/arch/m68k/kernel/vmlinux-sun3.lds index c192f773db968..47d04be322aac 100644 --- a/arch/m68k/kernel/vmlinux-sun3.lds +++ b/arch/m68k/kernel/vmlinux-sun3.lds @@ -82,6 +82,7 @@ __init_begin = .; EXIT_TEXT EXIT_DATA *(.exitcall.exit) + *(.discard) } .crap : { diff --git a/arch/m68knommu/kernel/vmlinux.lds.S b/arch/m68knommu/kernel/vmlinux.lds.S index b7fe505e358d8..68111a61a77f2 100644 --- a/arch/m68knommu/kernel/vmlinux.lds.S +++ b/arch/m68knommu/kernel/vmlinux.lds.S @@ -188,6 +188,7 @@ SECTIONS { EXIT_TEXT EXIT_DATA *(.exitcall.exit) + *(.discard) } .bss : { diff --git a/arch/microblaze/kernel/vmlinux.lds.S b/arch/microblaze/kernel/vmlinux.lds.S index d34d38dcd12c7..a207543c5927f 100644 --- a/arch/microblaze/kernel/vmlinux.lds.S +++ b/arch/microblaze/kernel/vmlinux.lds.S @@ -162,4 +162,6 @@ SECTIONS { } . = ALIGN(4096); _end = .; + + /DISCARD/ : { *(.discard) } } diff --git a/arch/mips/kernel/vmlinux.lds.S b/arch/mips/kernel/vmlinux.lds.S index 58738c8d754fe..45901609b741d 100644 --- a/arch/mips/kernel/vmlinux.lds.S +++ b/arch/mips/kernel/vmlinux.lds.S @@ -179,6 +179,7 @@ SECTIONS /* Sections to be discarded */ /DISCARD/ : { *(.exitcall.exit) + *(.discard) /* ABI crap starts here */ *(.MIPS.options) diff --git a/arch/mn10300/kernel/vmlinux.lds.S b/arch/mn10300/kernel/vmlinux.lds.S index 24de6b90f4014..5d9f2f96ad921 100644 --- a/arch/mn10300/kernel/vmlinux.lds.S +++ b/arch/mn10300/kernel/vmlinux.lds.S @@ -146,6 +146,7 @@ SECTIONS /* Sections to be discarded */ /DISCARD/ : { *(.exitcall.exit) + *(.discard) } STABS_DEBUG diff --git a/arch/parisc/kernel/vmlinux.lds.S b/arch/parisc/kernel/vmlinux.lds.S index fd2cc4fd2b65a..ccf58341845a1 100644 --- a/arch/parisc/kernel/vmlinux.lds.S +++ b/arch/parisc/kernel/vmlinux.lds.S @@ -240,6 +240,7 @@ SECTIONS /* Sections to be discarded */ /DISCARD/ : { *(.exitcall.exit) + *(.discard) #ifdef CONFIG_64BIT /* temporary hack until binutils is fixed to not emit these * for static binaries diff --git a/arch/powerpc/kernel/vmlinux.lds.S b/arch/powerpc/kernel/vmlinux.lds.S index 8ef8a14abc95b..7fca9355fd3d6 100644 --- a/arch/powerpc/kernel/vmlinux.lds.S +++ b/arch/powerpc/kernel/vmlinux.lds.S @@ -40,6 +40,7 @@ SECTIONS /* Sections to be discarded. */ /DISCARD/ : { *(.exitcall.exit) + *(.discard) EXIT_DATA } diff --git a/arch/s390/kernel/vmlinux.lds.S b/arch/s390/kernel/vmlinux.lds.S index a53db23ee092f..98867dfea4696 100644 --- a/arch/s390/kernel/vmlinux.lds.S +++ b/arch/s390/kernel/vmlinux.lds.S @@ -161,6 +161,7 @@ SECTIONS /DISCARD/ : { EXIT_DATA *(.exitcall.exit) + *(.discard) } /* Debugging sections. */ diff --git a/arch/sh/kernel/vmlinux.lds.S b/arch/sh/kernel/vmlinux.lds.S index f53c76acaede2..766976d27b219 100644 --- a/arch/sh/kernel/vmlinux.lds.S +++ b/arch/sh/kernel/vmlinux.lds.S @@ -171,6 +171,7 @@ SECTIONS */ /DISCARD/ : { *(.exitcall.exit) + *(.discard) } STABS_DEBUG diff --git a/arch/sparc/kernel/vmlinux.lds.S b/arch/sparc/kernel/vmlinux.lds.S index fcbbd000ec084..d63cf914667de 100644 --- a/arch/sparc/kernel/vmlinux.lds.S +++ b/arch/sparc/kernel/vmlinux.lds.S @@ -175,6 +175,7 @@ SECTIONS EXIT_TEXT EXIT_DATA *(.exitcall.exit) + *(.discard) } STABS_DEBUG diff --git a/arch/um/kernel/dyn.lds.S b/arch/um/kernel/dyn.lds.S index 9975e1ab44fb3..2916d6eadffd4 100644 --- a/arch/um/kernel/dyn.lds.S +++ b/arch/um/kernel/dyn.lds.S @@ -156,4 +156,6 @@ SECTIONS STABS_DEBUG DWARF_DEBUG + + /DISCARD/ : { *(.discard) } } diff --git a/arch/um/kernel/uml.lds.S b/arch/um/kernel/uml.lds.S index 11b835248b865..1f8a622cabe19 100644 --- a/arch/um/kernel/uml.lds.S +++ b/arch/um/kernel/uml.lds.S @@ -100,4 +100,6 @@ SECTIONS STABS_DEBUG DWARF_DEBUG + + /DISCARD/ : { *(.discard) } } diff --git a/arch/xtensa/kernel/vmlinux.lds.S b/arch/xtensa/kernel/vmlinux.lds.S index 41c159cd872f1..b1e24638acd7c 100644 --- a/arch/xtensa/kernel/vmlinux.lds.S +++ b/arch/xtensa/kernel/vmlinux.lds.S @@ -287,6 +287,7 @@ SECTIONS EXIT_TEXT EXIT_DATA *(.exitcall.exit) + *(.discard) } .xt.lit : { *(.xt.lit) } diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h index 55413e568f07d..a19120c4e1095 100644 --- a/include/asm-generic/vmlinux.lds.h +++ b/include/asm-generic/vmlinux.lds.h @@ -628,6 +628,14 @@ #define INITRAMFS #endif +#define DISCARDS \ + /DISCARD/ : { \ + EXIT_TEXT \ + EXIT_DATA \ + *(.exitcall.exit) \ + *(.discard) \ + } + /** * PERCPU_VADDR - define output section for percpu area * @vaddr: explicit base address (optional) diff --git a/scripts/module-common.lds b/scripts/module-common.lds new file mode 100644 index 0000000000000..47a1f9ae0edeb --- /dev/null +++ b/scripts/module-common.lds @@ -0,0 +1,8 @@ +/* + * Common module linker script, always used when linking a module. + * Archs are free to supply their own linker scripts. ld will + * combine them automatically. + */ +SECTIONS { + /DISCARD/ : { *(.discard) } +}