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0415b00d17
linux/arch/s390/kernel
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Tejun Heo 0415b00d17 percpu: Always align percpu output section to PAGE_SIZE 
Percpu allocator honors alignment request upto PAGE_SIZE and both the
percpu addresses in the percpu address space and the translated kernel
addresses should be aligned accordingly.  The calculation of the
former depends on the alignment of percpu output section in the kernel
image.

The linker script macros PERCPU_VADDR() and PERCPU() are used to
define this output section and the latter takes @align parameter.
Several architectures are using @align smaller than PAGE_SIZE breaking
percpu memory alignment.

This patch removes @align parameter from PERCPU(), renames it to
PERCPU_SECTION() and makes it always align to PAGE_SIZE.  While at it,
add PCPU_SETUP_BUG_ON() checks such that alignment problems are
reliably detected and remove percpu alignment comment recently added
in workqueue.c as the condition would trigger BUG way before reaching
there.

For um, this patch raises the alignment of percpu area.  As the area
is in .init, there shouldn't be any noticeable difference.

This problem was discovered by David Howells while debugging boot
failure on mn10300.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Mike Frysinger <vapier@gentoo.org>
Cc: uclinux-dist-devel@blackfin.uclinux.org
Cc: David Howells <dhowells@redhat.com>
Cc: Jeff Dike <jdike@addtoit.com>
Cc: user-mode-linux-devel@lists.sourceforge.net
2011-03-24 18:50:09 +01:00
..
vdso32 [S390] vdso: get rid of redefinition warnings 2010-10-29 16:50:50 +02:00
vdso64 [S390] vdso: get rid of redefinition warnings 2010-10-29 16:50:50 +02:00
asm-offsets.c [S390] ptrace cleanup 2011-01-05 12:47:31 +01:00
audit.c [S390] Get rid of a bunch of sparse warnings again. 2007-10-12 16:13:06 +02:00
audit.h [S390] Get rid of a bunch of sparse warnings again. 2007-10-12 16:13:06 +02:00
base.S [S390] Cleanup struct _lowcore usage and defines. 2010-02-26 22:37:31 +01:00
bitmap.c [S390] move EXPORT_SYMBOLs to definitions 2009-03-26 15:24:11 +01:00
compat_audit.c [S390] Get rid of a bunch of sparse warnings again. 2007-10-12 16:13:06 +02:00
compat_exec_domain.c [S390] Get rid of a lot of sparse warnings. 2007-02-05 21:16:47 +01:00
compat_linux.c BKL: remove extraneous #include <smp_lock.h> 2010-11-17 08:59:32 -08:00
compat_linux.h Mark arguments to certain syscalls as being const 2010-08-13 16:53:13 -07:00
compat_ptrace.h [S390] ptrace cleanup 2011-01-05 12:47:31 +01:00
compat_signal.c [S390] 64-bit register support for 31-bit processes 2009-10-06 10:35:10 +02:00
compat_wrapper.S [S390] wire up prlimit64 and fanotify* syscalls 2010-08-13 10:06:54 +02:00
cpcmd.c [S390] convert cpcmd printks to pr_xxx macros. 2008-12-25 13:39:19 +01:00
crash.c [S390] Get rid of a lot of sparse warnings. 2007-02-05 21:16:47 +01:00
debug.c llseek: automatically add .llseek fop 2010-10-15 15:53:27 +02:00
diag.c [S390] vmur: fix diag14 exceptions with addresses > 2GB. 2007-08-22 13:51:47 +02:00
dis.c [S390] add z196 instructions to kernel disassembler 2010-10-25 16:10:15 +02:00
early.c [S390] facility detection: remove unused variable 2010-10-29 16:50:50 +02:00
ebcdic.c [S390] Get rid of a lot of sparse warnings. 2007-02-05 21:16:47 +01:00
entry64.S [S390] ptrace cleanup 2011-01-05 12:47:31 +01:00
entry.h [S390] ptrace cleanup 2011-01-05 12:47:31 +01:00
entry.S [S390] ptrace cleanup 2011-01-05 12:47:31 +01:00
ftrace.c [S390] cleanup ftrace backend functions 2011-01-05 12:47:31 +01:00
head31.S [S390] correct address of _stext with CONFIG_SHARED_KERNEL=y 2010-05-12 09:32:26 +02:00
head64.S [S390] correct address of _stext with CONFIG_SHARED_KERNEL=y 2010-05-12 09:32:26 +02:00
head.S [S390] Add config option for z196 code generation. 2010-10-25 16:10:15 +02:00
init_task.c Use new __init_task_data macro in arch init_task.c files. 2009-09-21 06:27:08 +02:00
ipl.c sysfs: add struct file* to bin_attr callbacks 2010-05-21 09:37:31 -07:00
irq.c [S390] ap bus: add support for irq statistics 2011-01-05 12:47:26 +01:00
kprobes.c [S390] ptrace cleanup 2011-01-05 12:47:31 +01:00
machine_kexec.c [S390] kexec: Disable ftrace during kexec 2011-03-15 17:08:24 +01:00
Makefile [S390] add support for compressed kernels 2010-02-26 22:37:33 +01:00
mcount64.S [S390] cleanup ftrace backend functions 2011-01-05 12:47:31 +01:00
mcount.S [S390] cleanup ftrace backend functions 2011-01-05 12:47:31 +01:00
mem_detect.c Fix IRQ flag handling naming 2010-10-07 14:08:55 +01:00
module.c modules: Fix module_bug_list list corruption race 2010-10-05 11:29:27 -07:00
nmi.c [S390] irq: have detailed statistics for interrupt types 2011-01-05 12:47:25 +01:00
process.c [S390] Randomize PIEs 2011-01-12 09:55:25 +01:00
processor.c [S390] prevent unneccesary loops_per_jiffy recalculation 2011-01-05 12:47:32 +01:00
ptrace.c [S390] ptrace cleanup 2011-01-05 12:47:31 +01:00
reipl64.S [S390] Cleanup struct _lowcore usage and defines. 2010-02-26 22:37:31 +01:00
reipl.S [S390] Cleanup struct _lowcore usage and defines. 2010-02-26 22:37:31 +01:00
relocate_kernel64.S [S390] Reset infrastructure for re-IPL. 2006-12-04 15:40:26 +01:00
relocate_kernel.S [S390] Reset infrastructure for re-IPL. 2006-12-04 15:40:26 +01:00
s390_ext.c [S390] extint: get rid of early code plus cleanup 2011-01-05 12:47:26 +01:00
s390_ksyms.c [S390] move EXPORT_SYMBOLs to definitions 2009-03-26 15:24:11 +01:00
sclp.S Merge branch 'for-next' into for-linus 2010-03-08 16:55:37 +01:00
setup.c [S390] Add z196 machine type to setup_hwcaps 2010-10-29 16:50:49 +02:00
signal.c [S390] ptrace cleanup 2011-01-05 12:47:31 +01:00
smp.c [S390] smp: remove cpu hotplug messages 2011-01-05 12:47:31 +01:00
stacktrace.c [S390] Fix stacktrace compile bug. 2008-07-17 17:22:09 +02:00
suspend.c [S390] hibernate: make sure pfn_is_nosave handles lowcore pages 2009-09-22 22:58:45 +02:00
switch_cpu64.S [S390] Cleanup struct _lowcore usage and defines. 2010-02-26 22:37:31 +01:00
switch_cpu.S [S390] Cleanup struct _lowcore usage and defines. 2010-02-26 22:37:31 +01:00
swsusp_asm64.S Merge branch 'for-35' of git://repo.or.cz/linux-kbuild 2010-06-01 08:55:52 -07:00
sys_s390.c [S390] sys_personality: follow u_long to unsigned int conversion 2010-08-13 10:06:54 +02:00
syscalls.S [S390] wire up prlimit64 and fanotify* syscalls 2010-08-13 10:06:54 +02:00
sysinfo.c [S390] topology: add SCHED_MC config option 2010-10-29 16:50:49 +02:00
time.c [S390] irq: have detailed statistics for interrupt types 2011-01-05 12:47:25 +01:00
topology.c [S390] topology: fix cpu masks for topology=off case 2010-10-29 16:50:50 +02:00
traps.c s390: remove task_show_regs 2011-02-15 07:34:16 -08:00
vdso.c mm: arch: rename in_gate_area_no_task to in_gate_area_no_mm 2011-03-23 16:36:55 -04:00
vmlinux.lds.S percpu: Always align percpu output section to PAGE_SIZE 2011-03-24 18:50:09 +01:00
vtime.c [S390] irq: have detailed statistics for interrupt types 2011-01-05 12:47:25 +01:00