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
reed_solomon
zlib_deflate
zlib_inflate	bzip2/lzma: library support for gzip, bzip2 and lzma decompression	2009-01-04 15:53:34 -08:00
.gitignore
argv_split.c
audit.c
bcd.c
bitmap.c	bitmap: fix end condition in bitmap_find_free_region	2009-03-12 19:32:51 -07:00
bitrev.c
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
cmdline.c
cpumask.c	cpumask: fix slab corruption caused by alloc_cpumask_var_node()	2009-04-02 19:05:11 -07:00
crc7.c
crc16.c
crc32.c
crc32defs.h
crc-ccitt.c
crc-itu-t.c
crc-t10dif.c
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_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
decompress.c	bzip2/lzma: don't stop search at first unconfigured compression	2009-02-19 13:36:55 -08:00
devres.c
div64.c
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
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
gen_crc32table.c
genalloc.c
halfmd4.c
hexdump.c
hweight.c
idr.c	cgroup: CSS ID support	2009-04-02 19:04:53 -07:00
inflate.c
int_sqrt.c
iomap_copy.c
iomap.c
iommu-helper.c	introduce generic iommu_num_pages function	2008-10-16 11:21:33 -07:00
ioremap.c
irq_regs.c
is_single_threaded.c	CRED: Rename is_single_threaded() to is_wq_single_threaded()	2008-11-14 10:39:21 +11:00
kasprintf.c
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
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_uevent.c	Revert "kobject: don't block for each kobject_uevent".	2009-04-16 14:41:24 -07:00
kobject.c	driver core: get rid of struct device's bus_id string array	2009-03-24 16:38:23 -07:00
kref.c
libcrc32c.c	libcrc32c: Fix "crc32c undefined" compilation error	2008-12-25 11:01:42 +11:00
list_debug.c
lmb.c	lmb: Rework lmb_dump_all() output	2009-02-11 13:38:00 +11:00
locking-selftest-hardirq.h
locking-selftest-mutex.h
locking-selftest-rlock-hardirq.h
locking-selftest-rlock-softirq.h
locking-selftest-rlock.h
locking-selftest-rsem.h
locking-selftest-softirq.h
locking-selftest-spin-hardirq.h
locking-selftest-spin-softirq.h
locking-selftest-spin.h
locking-selftest-wlock-hardirq.h
locking-selftest-wlock-softirq.h
locking-selftest-wlock.h
locking-selftest-wsem.h
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
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
ratelimit.c
rbtree.c	lib/rbtree.c: optimize rb_erase()	2009-04-01 08:59:17 -07:00
reciprocal_div.c
rwsem-spinlock.c
rwsem.c
scatterlist.c	lib/scatterlist.c: fix kunmap() argument in sg_miter_stop()	2008-11-19 18:49:58 -08:00
sha1.c
show_mem.c
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
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
string.c
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
textsearch.c
ts_bm.c
ts_fsm.c
ts_kmp.c
vsprintf.c	printk: fix wrong format string iter for printk	2009-04-08 17:03:44 +02:00