From d356c0b680d15e0187de48aa303e541b461ea794 Mon Sep 17 00:00:00 2001 From: Mike Frysinger Date: Tue, 26 Oct 2010 14:22:29 -0700 Subject: [PATCH] vmlinux.lds.h: gather .data..shared_aligned sections in DATA_DATA With the recent change "net: remove time limit in process_backlog()", the softnet_data variable changed from "DEFINE_PER_CPU()" to "DEFINE_PER_CPU_ALIGNED()" which moved it from the .data section to the .data.shared_align section. I'm not saying this patch is wrong, just that is what caused me to notice this larger problem. No one else in the kernel is using this aligned macro variant, so I imagine that's why no one has noticed yet. Since .data..shared_align isn't declared in any vmlinux files that I can see, the linker just places it last. This "just works" for most people, but when building a ROM kernel on Blackfin systems, it causes section overlap errors: bfin-uclinux-ld.real: section .init.data [00000000202e06b8 -> 00000000202e48b7] overlaps section .data.shared_aligned [00000000202e06b8 -> 00000000202e0723] I imagine other arches which support the ROM config option and thus do funky placement would see similar issues ... On x86, it is stuck in a dedicated section at the end: [8] .data PROGBITS ffffffff810ec000 2ec0000303a8 00 WA 0 0 4096 [9] .data.shared_alig PROGBITS ffffffff8111c3c0 31c3c00000c8 00 WA 0 0 64 So make sure we include this section in the DATA_DATA macro so that it is placed in the right location. Signed-off-by: Mike Frysinger Cc: Sam Ravnborg Cc: Jeremy Fitzhardinge Cc: Rusty Russell Cc: Alan Jenkins Cc: Greg Ungerer Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/asm-generic/vmlinux.lds.h | 1 + 1 file changed, 1 insertion(+) diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h index f4229fb315e1..aaf1105d9d91 100644 --- a/include/asm-generic/vmlinux.lds.h +++ b/include/asm-generic/vmlinux.lds.h @@ -150,6 +150,7 @@ #define DATA_DATA \ *(.data) \ *(.ref.data) \ + *(.data..shared_aligned) /* percpu related */ \ DEV_KEEP(init.data) \ DEV_KEEP(exit.data) \ CPU_KEEP(init.data) \