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Date: Mon, 30 Mar 2015 13:49:27 +0200 From: Ard Biesheuvel <ard.biesheuvel@...aro.org> To: linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, arnd@...db.de, mmarek@...e.cz, linux@....linux.org.uk Cc: Ard Biesheuvel <ard.biesheuvel@...aro.org> Subject: [RFC PATCH 2/2] Kbuild: avoid partial linking of drivers/built-in.o The recursive partial linking of vmlinux can result in a drivers/built-in.o that is so huge that it interferes with the ability of the linker to emit veneers in the final link stage if the symbols are out of reach. This is caused by the fact that those veneers, which should be emitted close enough to the original call site, can only be emitted after the .text section of drivers/built-in.o, whose size pushes those veneers out of range. So instead, avoid building drivers/built-in.o, and instead, add the constituent parts to the command line of the final link. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@...aro.org> --- Makefile | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) diff --git a/Makefile b/Makefile index e734965b1604..1eb6c246a586 100644 --- a/Makefile +++ b/Makefile @@ -558,7 +558,7 @@ scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \ # Objects we will link into vmlinux / subdirs we need to visit init-y := init/ -drivers-y := drivers/ sound/ firmware/ +drivers-y := sound/ firmware/ net-y := net/ libs-y := lib/ core-y := usr/ @@ -569,6 +569,16 @@ ifeq ($(dot-config),1) -include include/config/auto.conf ifeq ($(KBUILD_EXTMOD),) + +# drivers/built-in.o can become huge, which interferes with the linker's +# ability to emit stubs for branch targets that are out of reach for the +# ordinary relative branch instructions +include $(srctree)/drivers/Makefile +drivers-y += $(addprefix drivers/,$(sort $(obj-y))) +drivers-m += $(addprefix drivers/,$(sort $(obj-m))) +obj-y := +obj-m := + # Read in dependencies to all Kconfig* files, make sure to run # oldconfig if changes are detected. -include include/config/auto.conf.cmd -- 1.8.3.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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