Hugh Dickins 05f54c13cd Revert "kobject: don't block for each kobject_uevent". ... This reverts commit f520360d93. Tetsuo Handa, running a kernel with CONFIG_DEBUG_PAGEALLOC=y and CONFIG_UEVENT_HELPER_PATH=/sbin/hotplug, has been hitting RCU detected CPU stalls: it's been spinning in the loop where do_execve() counts up the args (but why wasn't fixup_exception working? dunno). The recent change, switching kobject_uevent_env() from UMH_WAIT_EXEC to UMH_NO_WAIT, is broken: the exec uses args on the local stack here, and an env which is kfreed as soon as call_usermodehelper() returns. It very much needs to wait for the exec to be done. An alternative would be to keep the UMH_NO_WAIT, and complicate the code to allocate and free these resources correctly? but no, as GregKH pointed out when making the commit, CONFIG_UEVENT_HELPER_PATH="" is a much better optimization - though some distros are still saying /sbin/hotplug in their .config, yet with no such binary in their initrd or their root. Reported-by: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp> Signed-off-by: Hugh Dickins <hugh@veritas.com> Acked-by: Greg Kroah-Hartman <gregkh@suse.de> Acked-by: Arjan van de Ven <arjan@linux.intel.com> Acked-by: Will Newton <will.newton@gmail.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2009-04-16 14:41:24 -07:00
..
lzo	lzo: use get/put_unaligned_* helpers	2008-07-25 10:53:26 -07:00
reed_solomon	lib: Remove unnecessary inclusions of asm/semaphore.h	2008-04-18 22:17:17 -04:00
zlib_deflate	lib/: Spelling fixes	2008-02-03 17:48:52 +02:00
zlib_inflate	bzip2/lzma: library support for gzip, bzip2 and lzma decompression	2009-01-04 15:53:34 -08:00
.gitignore
argv_split.c	LIB: Replace inappropriate include of <linux/bug.h>	2007-10-20 00:26:10 +02:00
audit.c	[PATCH] audit signal recipients	2007-05-11 05:38:25 -04:00
bcd.c	rtc: BCD codeshrink	2008-07-24 10:47:33 -07:00
bitmap.c	bitmap: fix end condition in bitmap_find_free_region	2009-03-12 19:32:51 -07:00
bitrev.c	lib: export bitrev16	2008-06-06 11:29:10 -07:00
bug.c	allow bug table entries to use relative pointers (and use it on x86-64)	2008-12-16 18:40:32 +01:00
bust_spinlocks.c	oops handling: ensure that any oops is flushed to the mtdoops console	2009-01-06 15:59:11 -08:00
check_signature.c	uninline check_signature()	2007-07-16 09:05:50 -07:00
cmdline.c	generic, memparse(): constify argument	2008-07-28 15:05:23 +02:00
cpumask.c	cpumask: fix slab corruption caused by alloc_cpumask_var_node()	2009-04-02 19:05:11 -07:00
crc-ccitt.c	[PATCH] kernel-doc for lib/crc*.c	2006-06-25 10:01:20 -07:00
crc-itu-t.c	CRC ITU-T V.41	2007-05-10 18:24:13 +02:00
crc-t10dif.c	[SCSI] lib: Add support for the T10 (SCSI) Data Integrity Field CRC	2008-07-12 08:22:32 -05:00
crc7.c	CRC7 support	2007-07-17 10:23:04 -07:00
crc16.c	[PATCH] kernel-doc for lib/crc*.c	2006-06-25 10:01:20 -07:00
crc32.c	lib/: Spelling fixes	2008-02-03 17:48:52 +02:00
crc32defs.h
ctype.c
debug_locks.c	lockdep: warn about lockdep disabling after kernel taint	2009-04-12 16:10:51 +02:00
debugobjects.c	debugobjects: delay free of internal objects	2009-03-17 12:28:30 +01:00
dec_and_lock.c
decompress.c	bzip2/lzma: don't stop search at first unconfigured compression	2009-02-19 13:36:55 -08:00
decompress_bunzip2.c	kmemtrace, kbuild: fix slab.h dependency problem in lib/decompress_bunzip2.c	2009-04-03 12:22:45 +02:00
decompress_inflate.c	kmemtrace, kbuild: fix slab.h dependency problem in lib/decompress_inflate.c	2009-04-03 12:21:36 +02:00
decompress_unlzma.c	kmemtrace, kbuild: fix slab.h dependency problem in lib/decompress_unlzma.c	2009-04-03 12:22:59 +02:00
devres.c	[POWERPC] devres: Add devm_ioremap_prot()	2008-05-05 16:47:14 +10:00
div64.c	add an inlined version of iter_div_u64_rem	2008-06-12 10:47:58 +02:00
dma-debug.c	dma-debug: fix printk formats (i386)	2009-03-30 14:28:59 -07:00
dump_stack.c
dynamic_debug.c	Dynamic debug: allow simple quoting of words	2009-03-24 16:38:27 -07:00
extable.c	lib/extable.c: remove an expensive integer divide in search_extable()	2008-02-06 10:41:08 -08:00
fault-inject.c	Remove remaining unwinder code	2009-01-06 15:59:11 -08:00
find_last_bit.c	bitmap: find_last_bit()	2009-01-01 10:12:19 +10:30
find_next_bit.c	bitops: remove "optimizations"	2008-04-29 08:11:16 -07:00
gen_crc32table.c
genalloc.c	Slab allocators: Replace explicit zeroing with __GFP_ZERO	2007-07-17 10:23:02 -07:00
halfmd4.c
hexdump.c	lib: create common ascii hex array	2008-05-14 19:11:14 -07:00
hweight.c	remove asm/bitops.h includes	2007-10-19 11:53:41 -07:00
idr.c	cgroup: CSS ID support	2009-04-02 19:04:53 -07:00
inflate.c	inflate: refactor inflate malloc code	2008-07-25 10:53:28 -07:00
int_sqrt.c
iomap.c	Use WARN() in lib/	2008-07-26 12:00:07 -07:00
iomap_copy.c	[PATCH] add __iowrite64_copy	2006-06-20 20:24:58 -07:00
iommu-helper.c	introduce generic iommu_num_pages function	2008-10-16 11:21:33 -07:00
ioremap.c	lib/ioremap.c should #include <linux/io.h>	2007-10-17 08:42:50 -07:00
irq_regs.c	[PATCH] irq_reqs: export __irq_regs	2006-10-06 08:53:40 -07:00
is_single_threaded.c	CRED: Rename is_single_threaded() to is_wq_single_threaded()	2008-11-14 10:39:21 +11:00
kasprintf.c	lib: move kasprintf to a separate file	2007-07-31 15:39:39 -07:00
Kconfig	Merge branch 'tracing/core-v2' into tracing-for-linus	2009-04-02 00:49:02 +02:00
Kconfig.debug	Merge branch 'linus' into core/softlockup	2009-04-07 11:15:40 +02:00
Kconfig.kgdb	kgdb: remove the requirement for CONFIG_FRAME_POINTER	2008-08-01 08:39:34 -05:00
kernel_lock.c	sched: TIF_NEED_RESCHED -> need_reshed() cleanup	2009-03-06 12:48:55 +01:00
klist.c	driver core: Remove completion from struct klist_node	2009-01-06 10:44:30 -08:00
kobject.c	driver core: get rid of struct device's bus_id string array	2009-03-24 16:38:23 -07:00
kobject_uevent.c	Revert "kobject: don't block for each kobject_uevent".	2009-04-16 14:41:24 -07:00
kref.c	kref: add kref_set()	2008-01-24 20:40:05 -08:00
libcrc32c.c	libcrc32c: Fix "crc32c undefined" compilation error	2008-12-25 11:01:42 +11:00
list_debug.c	list debugging: use WARN() instead of BUG()	2008-07-25 10:53:29 -07:00
lmb.c	lmb: Rework lmb_dump_all() output	2009-02-11 13:38:00 +11:00
locking-selftest-hardirq.h	[PATCH] lockdep: locking API self tests	2006-07-03 15:27:03 -07:00
locking-selftest-mutex.h	[PATCH] lockdep: locking API self tests	2006-07-03 15:27:03 -07:00
locking-selftest-rlock-hardirq.h	[PATCH] lockdep: locking API self tests	2006-07-03 15:27:03 -07:00
locking-selftest-rlock-softirq.h	[PATCH] lockdep: locking API self tests	2006-07-03 15:27:03 -07:00
locking-selftest-rlock.h	[PATCH] lockdep: locking API self tests	2006-07-03 15:27:03 -07:00
locking-selftest-rsem.h	[PATCH] lockdep: locking API self tests	2006-07-03 15:27:03 -07:00
locking-selftest-softirq.h	[PATCH] lockdep: locking API self tests	2006-07-03 15:27:03 -07:00
locking-selftest-spin-hardirq.h	[PATCH] lockdep: locking API self tests	2006-07-03 15:27:03 -07:00
locking-selftest-spin-softirq.h	[PATCH] lockdep: locking API self tests	2006-07-03 15:27:03 -07:00
locking-selftest-spin.h	[PATCH] lockdep: locking API self tests	2006-07-03 15:27:03 -07:00
locking-selftest-wlock-hardirq.h	[PATCH] lockdep: locking API self tests	2006-07-03 15:27:03 -07:00
locking-selftest-wlock-softirq.h	[PATCH] lockdep: locking API self tests	2006-07-03 15:27:03 -07:00
locking-selftest-wlock.h	[PATCH] lockdep: locking API self tests	2006-07-03 15:27:03 -07:00
locking-selftest-wsem.h	[PATCH] lockdep: locking API self tests	2006-07-03 15:27:03 -07:00
locking-selftest.c	locking: rename trace_softirq_[enter|exit] => lockdep_softirq_[enter|exit]	2009-03-13 01:32:36 +01:00
Makefile	Merge branch 'linus' into core/iommu	2009-03-28 23:05:50 +01:00
nlattr.c	Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/kaber/nf-next-2.6	2009-03-26 22:45:23 -07:00
parser.c	vfs: Use const for kernel parser table	2008-10-13 10:10:37 -07:00
percpu_counter.c	Merge branch 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2009-01-06 17:10:04 -08:00
plist.c	Use WARN() in lib/	2008-07-26 12:00:07 -07:00
prio_heap.c	lib: fix sparse shadowed variable warning	2009-01-06 15:59:11 -08:00
prio_tree.c
proportions.c	Merge branch 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2009-01-06 17:10:04 -08:00
radix-tree.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2009-01-07 11:31:52 -08:00
random32.c	random32: seeding improvement	2008-07-30 16:29:19 -07:00
ratelimit.c	__ratelimit() cpu flags can't be static	2008-07-28 16:30:20 -07:00
rbtree.c	lib/rbtree.c: optimize rb_erase()	2009-04-01 08:59:17 -07:00
reciprocal_div.c	[PATCH] SLAB: use a multiply instead of a divide in obj_to_index()	2006-12-13 09:05:49 -08:00
rwsem-spinlock.c	lib: remove fastcall from lib/*	2008-02-08 09:22:31 -08:00
rwsem.c	x86: fix UML and -regparm=3	2008-01-30 13:33:00 +01:00
scatterlist.c	lib/scatterlist.c: fix kunmap() argument in sg_miter_stop()	2008-11-19 18:49:58 -08:00
sha1.c	[PATCH] Numerous fixes to kernel-doc info in source files.	2007-02-11 10:51:32 -08:00
show_mem.c	lib: generic show_mem()	2008-07-26 12:00:10 -07:00
smp_processor_id.c	cpumask: convert lib/smp_processor_id to new cpumask ops	2009-01-30 15:47:34 +01:00
sort.c	generic swap(): lib/sort.c: rename swap to swap_func	2009-01-08 08:31:14 -08:00
spinlock_debug.c	Use helpers to obtain task pid in printks	2007-10-19 11:53:43 -07:00
string.c	Add a new sysfs_streq() string comparison function	2008-05-01 08:03:59 -07:00
string_helpers.c	[SCSI] lib: string_get_size(): don't hang on zero; no decimals on exact	2008-10-23 11:42:20 -05:00
swiotlb.c	dma-mapping: replace all DMA_32BIT_MASK macro with DMA_BIT_MASK(32)	2009-04-07 08:31:11 -07:00
syscall.c	task_current_syscall	2008-07-26 12:00:10 -07:00
textsearch.c	remove CONFIG_KMOD from lib	2008-07-22 19:24:31 +10:00
ts_bm.c	textsearch: ts_bm: support case insensitive searching in Boyer-Moore algorithm	2008-07-08 02:37:54 -07:00
ts_fsm.c	textsearch: ts_fsm: return error on request for case insensitive search	2008-07-08 02:38:27 -07:00
ts_kmp.c	textsearch: ts_kmp: support case insensitive searching in Knuth-Morris-Pratt algorithm	2008-07-08 02:38:09 -07:00
vsprintf.c	printk: fix wrong format string iter for printk	2009-04-08 17:03:44 +02:00