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Date: Wed, 20 May 2009 16:37:32 +0900 From: Tejun Heo <tj@...nel.org> To: mingo@...e.hu, linux-kernel@...r.kernel.org, x86@...nel.org, ink@...assic.park.msu.ru, rth@...ddle.net, linux@....linux.org.uk, hskinnemoen@...el.com, cooloney@...nel.org, starvik@...s.com, jesper.nilsson@...s.com, dhowells@...hat.com, ysato@...rs.sourceforge.jp, tony.luck@...el.com, takata@...ux-m32r.org, geert@...ux-m68k.org, monstr@...str.eu, ralf@...ux-mips.org, kyle@...artin.ca, benh@...nel.crashing.org, paulus@...ba.org, schwidefsky@...ibm.com, heiko.carstens@...ibm.com, lethal@...ux-sh.org, davem@...emloft.net, jdike@...toit.com, chris@...kel.net, rusty@...tcorp.com.au Subject: [PATCHSET core/percpu] percpu: convert most archs to dynamic percpu Hello, Please do NOT pull before maintainers of alpha and s390 ack. Upon ack, please pull from the following git tree. git://git.kernel.org/pub/scm/linux/kernel/git/tj/misc.git tj-percpu This patchset is combination of the last patch of percpu-use-dynamic-percpu-allocator-as-default patchset[1] and patches inspired by alpha conversion patch[2] posted by Ivan Kokshaysky. 0001-percpu-use-dynamic-percpu-allocator-as-the-default.patch 0002-linker-script-throw-away-.discard-section.patch 0003-percpu-clean-up-percpu-variable-definitions.patch 0004-percpu-enforce-global-uniqueness-and-disallow-in-fu.patch 0005-alpha-kill-unnecessary-__used-attribute-in-PER_CPU_.patch 0006-alpha-switch-to-dynamic-percpu-allocator.patch 0007-s390-switch-to-dynamic-percpu-allocator.patch 0001 is mostly unchanged except for added Acked-by's. 0002-0003 prepare for percpu variable definition update - .discard is thrown away on all archs when linking kernel and modules, static percpu variables in functions are moved outside of the function and all static percpu variables are given unique names. 0004 updates percpu variable definition such that all percpu variables in the same link unit have unique names regardless of its scope (static or global) and disallow in-function static definitions. The new definition uses dummy variables in .discard to enforce the declaration/definition semantics and always defines percpu variables as globals. This allows archs to add 'weak' attribute if necessary. 0005-0006 converts alpha to use 'weak' attribute instead of inline assembly to generate GOT based reference when referencing percpu variables from modules, which in turn allows conversion to dynamic percpu allocator. 0007 does the same for s390. The new DECLARE/DEFINE macros implement the following behaviors. a. DECLARE + static DEFINE -> compile error b. multiple non-static DEFINEs with the same name -> compile error c. multiple static/global DEFINEs with the same name -> compile error d. in function static DEFINEs -> compile error #a and #b are expected behaviors on DECLARE/DEFINE macros in general. #c and #d are necessary to allow 'weak' attribute on certain archs. Please note that the rules are applied consistently whether 'weak' attribute is specified or not. This eases catching mistakes and makes things less confusing. Test config boots and works fine on x86_64. alpha and s390 are compile tested and verified to generate necessary code for external references but I don't have any way to actually verify them, so please test them. :-) all-yes-config on x86_64 is building now. Ergggh... I want more memory. Okay, completed successfully. This patchset is on top of the last #tj-percpu (e1b9aa3f47242e757c776a3771bb6613e675bf9c) + linus#master (279e677faa775ad16e75c32e1bf4a37f8158bc61) and contains the following changes. Makefile | 2 arch/alpha/include/asm/percpu.h | 101 ++------------------------------- arch/alpha/include/asm/tlbflush.h | 1 arch/alpha/kernel/vmlinux.lds.S | 1 arch/arm/kernel/vmlinux.lds.S | 1 arch/avr32/kernel/vmlinux.lds.S | 1 arch/blackfin/kernel/vmlinux.lds.S | 1 arch/cris/include/asm/mmu_context.h | 2 arch/cris/kernel/vmlinux.lds.S | 1 arch/frv/kernel/vmlinux.lds.S | 2 arch/h8300/kernel/vmlinux.lds.S | 1 arch/ia64/Kconfig | 3 arch/ia64/kernel/vmlinux.lds.S | 1 arch/m32r/kernel/vmlinux.lds.S | 1 arch/m68k/kernel/vmlinux-std.lds | 1 arch/m68k/kernel/vmlinux-sun3.lds | 1 arch/m68knommu/kernel/vmlinux.lds.S | 1 arch/microblaze/kernel/vmlinux.lds.S | 2 arch/mips/kernel/vmlinux.lds.S | 1 arch/mn10300/kernel/vmlinux.lds.S | 1 arch/parisc/kernel/vmlinux.lds.S | 1 arch/powerpc/Kconfig | 3 arch/powerpc/kernel/vmlinux.lds.S | 1 arch/s390/include/asm/percpu.h | 32 ++-------- arch/s390/kernel/vmlinux.lds.S | 1 arch/sh/kernel/vmlinux_32.lds.S | 1 arch/sh/kernel/vmlinux_64.lds.S | 1 arch/sparc/Kconfig | 3 arch/sparc/kernel/vmlinux.lds.S | 1 arch/um/kernel/dyn.lds.S | 2 arch/um/kernel/uml.lds.S | 2 arch/x86/Kconfig | 3 arch/xtensa/kernel/vmlinux.lds.S | 1 block/as-iosched.c | 10 +-- block/cfq-iosched.c | 10 +-- drivers/cpufreq/cpufreq_conservative.c | 12 +-- drivers/cpufreq/cpufreq_ondemand.c | 15 ++-- drivers/xen/events.c | 9 +- include/linux/percpu-defs.h | 34 ++++++++--- include/linux/percpu.h | 12 ++- init/main.c | 24 ------- kernel/module.c | 6 - mm/Makefile | 2 mm/allocpercpu.c | 28 +++++++++ mm/page-writeback.c | 5 - mm/percpu.c | 40 ++++++++++++- net/ipv4/syncookies.c | 4 - net/ipv6/syncookies.c | 4 - scripts/module-common.lds | 8 ++ 49 files changed, 206 insertions(+), 195 deletions(-) Thanks. -- tejun [1] http://thread.gmane.org/gmane.linux.kernel/804631/focus=804627 [2] http://thread.gmane.org/gmane.linux.kernel/820849/focus=820926 -- 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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