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Michael Holzheu 66f6958e69 lib/string.c: fix strim() semantics for strings that have only blanks 
Commit 84c95c9acf ("string: on strstrip(), first remove leading spaces
before running over str") improved the performance of the strim()
function.

Unfortunately this changed the semantics of strim() and broke my code.
Before the patch it was possible to use strim() without using the return
value for removing trailing spaces from strings that had either only
blanks or only trailing blanks.

Now this does not work any longer for strings that *only* have blanks.

Before patch: "   " -> ""    (empty string)
After patch:  "   " -> "   " (no change)

I think we should remove your patch to restore the old behavior.

The description (lib/string.c):

 * Note that the first trailing whitespace is replaced with a %NUL-terminator

=> The first trailing whitespace of a string that only has whitespace
   characters is the first whitespace

The patch restores the old strim() semantics.

Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Cc: Andre Goddard Rosa <andre.goddard@gmail.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-10-31 17:30:56 -07:00
..
lzo lib: add support for LZO-compressed kernels 2010-01-11 09:34:04 -08:00
raid6 lib/raid6: Fix filename emitted in generated code 2011-10-20 11:27:50 +11:00
reed_solomon
xz XZ: Fix incorrect XZ_BUF_ERROR 2011-09-21 13:39:59 -07:00
zlib_deflate zlib: slim down zlib_deflate() workspace when possible 2011-03-22 17:44:17 -07:00
zlib_inflate inflate_fast: sout is already a short so ptr arith was off by one. 2010-03-12 15:52:44 -08:00
.gitignore
argv_split.c tree-wide: convert open calls to remove spaces to skip_spaces() lib function 2009-12-15 08:53:32 -08:00
atomic64.c lib: atomic64: Change the type of local lock to raw_spinlock_t 2011-09-14 13:14:11 +02:00
atomic64_test.c atomic: use <linux/atomic.h> 2011-07-26 16:49:47 -07:00
audit.c audit: support the "standard" <asm-generic/unistd.h> 2011-05-04 14:41:28 -04:00
average.c lib: Improve EWMA efficiency by using bitshifts 2010-12-06 15:58:43 -05:00
bcd.c
bch.c lib: add shared BCH ECC library 2011-03-11 14:25:50 +00:00
bitmap.c lib/bitmap.c: quiet sparse noise about address space 2011-10-31 17:30:56 -07:00
bitrev.c
bsearch.c lib: Add generic binary search function to the kernel. 2011-05-19 16:55:27 +09:30
btree.c Fix common misspellings 2011-03-31 11:26:23 -03:00
bug.c modules: Fix module_bug_list list corruption race 2010-10-05 11:29:27 -07:00
bust_spinlocks.c
check_signature.c
checksum.c lib/checksum.c: optimize do_csum a bit 2011-07-07 04:52:24 -07:00
cmdline.c
cordic.c lib: cordic: add library module providing cordic angle calculation 2011-06-03 15:01:07 -04:00
cpu-notifier-error-inject.c fault-injection: add CPU notifier error injection module 2010-05-27 09:12:48 -07:00
cpu_rmap.c lib: cpu_rmap: CPU affinity reverse-mapping 2011-01-24 14:51:56 -08:00
cpumask.c cpumask: alloc_cpumask_var() use NUMA_NO_NODE 2011-07-26 16:49:44 -07:00
crc-ccitt.c
crc-itu-t.c
crc-t10dif.c
crc7.c
crc8.c lib: crc8: add new library module providing crc8 algorithm 2011-06-03 15:01:06 -04:00
crc16.c
crc32.c atomic: use <linux/atomic.h> 2011-07-26 16:49:47 -07:00
crc32defs.h
ctype.c ctype: constify read-only _ctype string 2009-12-15 08:53:32 -08:00
debug_locks.c Revert "debug_locks: set oops_in_progress if we will log messages." 2010-11-29 15:18:28 -08:00
debugobjects.c debugobjects: Fix boot crash when kmemleak and debugobjects enabled 2011-06-20 14:38:43 +02:00
dec_and_lock.c atomic: use <linux/atomic.h> 2011-07-26 16:49:47 -07:00
decompress.c decompressors: add boot-time XZ support 2011-01-13 08:03:25 -08:00
decompress_bunzip2.c Decompressors: include <linux/slab.h> in <linux/decompress/mm.h> 2011-01-13 08:03:23 -08:00
decompress_inflate.c decompressors: check input size in decompress_inflate.c 2011-01-13 08:03:25 -08:00
decompress_unlzma.c Decompressors: validate match distance in decompress_unlzma.c 2011-01-13 08:03:24 -08:00
decompress_unlzo.c Decompressors: fix callback-to-callback mode in decompress_unlzo.c 2011-01-13 08:03:24 -08:00
decompress_unxz.c Fix common misspellings 2011-03-31 11:26:23 -03:00
devres.c devres: fix possible use after free 2011-07-25 20:57:14 -07:00
div64.c div64_u64(): improve precision on 32bit platforms 2010-10-26 16:52:19 -07:00
dma-debug.c dma-debug: hash_bucket_find needs to allow for offsets within an entry 2011-08-23 15:36:00 +02:00
dump_stack.c
dynamic_debug.c Merge branch 'driver-core-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core 2011-10-25 12:13:59 +02:00
extable.c module: trim exception table on init free. 2009-06-12 21:47:04 +09:30
fault-inject.c fault-inject: export setup_fault_attr() 2011-10-26 16:32:11 -04:00
find_last_bit.c bitops: add #ifndef for each of find bitops 2011-05-26 17:12:38 -07:00
find_next_bit.c arch: remove CONFIG_GENERIC_FIND_{NEXT_BIT,BIT_LE,LAST_BIT} 2011-05-26 17:12:38 -07:00
flex_array.c flex_array: avoid divisions when accessing elements 2011-05-26 17:12:33 -07:00
gcd.c lib: add lib/gcd.c 2009-06-18 13:04:05 -07:00
gen_crc32table.c crc32: major optimization 2010-05-25 08:07:06 -07:00
genalloc.c lib, Make gen_pool memory allocator lockless 2011-08-03 11:15:57 -04:00
halfmd4.c
hexdump.c lib: add error checking to hex2bin 2011-09-20 23:24:44 -04:00
hweight.c x86: Add optimized popcnt variants 2010-04-06 15:52:11 -07:00
idr.c lib/idr.c: fix comment for ida_get_new_above() 2011-10-31 17:30:56 -07:00
inflate.c MN10300: Don't try and #include <linux/slab.h> in lib/inflate.c from bootloader 2010-08-12 09:51:35 -07:00
int_sqrt.c
iomap.c iomap: make IOPORT/PCI mapping functions conditional 2011-07-22 18:46:26 +02:00
iomap_copy.c
iommu-helper.c iommu: inline iommu_num_pages 2010-08-09 20:45:05 -07:00
ioremap.c ACPI, APEI, Generic Hardware Error Source POLL/IRQ/NMI notification type support 2011-01-12 03:06:19 -05:00
irq_regs.c
is_single_threaded.c kernel: is_current_single_threaded: don't use ->mmap_sem 2009-07-17 09:11:31 +10:00
kasprintf.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
Kconfig llist: Make some llist functions inline 2011-10-04 11:30:53 +02:00
Kconfig.debug lib/Kconfig.debug: fix help message for DEFAULT_HUNG_TASK_TIMEOUT 2011-10-31 17:30:51 -07:00
Kconfig.kgdb mips,kgdb: kdb low level trap catch and stack trace 2010-05-20 21:04:26 -05:00
Kconfig.kmemcheck kmemcheck: depend on HAVE_ARCH_KMEMCHECK 2009-07-01 22:28:44 +02:00
klist.c
kobject.c Delay struct net freeing while there's a sysfs instance refering to it 2011-06-12 17:45:41 -04:00
kobject_uevent.c kobj_uevent: Ignore if some listeners cannot handle message 2011-08-22 18:31:24 -07:00
kref.c kref: Add a kref_sub function 2010-11-22 13:25:13 +10:00
kstrtox.c lib/kstrtox: common code between kstrto*() and simple_strto*() functions 2011-10-31 17:30:56 -07:00
kstrtox.h lib/kstrtox: common code between kstrto*() and simple_strto*() functions 2011-10-31 17:30:56 -07:00
lcm.c lib/lcm.c: quiet sparse noise 2011-07-25 20:57:15 -07:00
libcrc32c.c
list_debug.c Expand CONFIG_DEBUG_LIST to several other list operations 2011-02-18 11:32:28 -08:00
list_sort.c lib/list_sort: test: check element addresses 2010-10-26 16:52:19 -07:00
llist.c llist: Remove cpu_relax() usage in cmpxchg loops 2011-10-04 12:44:03 +02:00
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 rcu: Fix unpaired rcu_irq_enter() from locking selftests 2011-05-26 09:42:19 -07:00
lru_cache.c lru_cache: use correct type in sizeof for allocation 2011-05-25 08:39:52 -07:00
Makefile llist: Make some llist functions inline 2011-10-04 11:30:53 +02:00
md5.c crypto: Move md5_transform to lib/md5.c 2011-08-06 18:32:45 -07:00
nlattr.c net: fix nla_policy_len to actually _iterate_ over the policy 2011-02-28 12:38:25 -08:00
parser.c Fix common misspellings 2011-03-31 11:26:23 -03:00
percpu_counter.c lib/percpu_counter.c: enclose hotplug only variables in hotplug ifdef 2011-10-31 17:30:56 -07:00
plist.c plist: Remove the need to supply locks to plist heads 2011-07-08 14:02:53 +02:00
prio_heap.c
prio_tree.c
proportions.c locking, lib/proportions: Annotate prop_local_percpu::lock as raw 2011-09-13 11:11:50 +02:00
radix-tree.c radix_tree: clean away saw_unset_tag leftovers 2011-10-31 17:30:45 -07:00
random32.c Merge branch 'master' into for-next 2010-06-16 18:08:13 +02:00
ratelimit.c locking, printk: Annotate logbuf_lock as raw 2011-09-13 11:11:54 +02:00
rational.c lib/rational.c needs module.h 2010-01-11 09:34:05 -08:00
rbtree.c Export the augmented rbtree helper functions 2011-01-28 12:16:59 +10:00
reciprocal_div.c
rwsem-spinlock.c locking, rwsem: Annotate inner lock as raw 2011-09-13 11:11:59 +02:00
rwsem.c locking, rwsem: Annotate inner lock as raw 2011-09-13 11:11:59 +02:00
scatterlist.c scatterlist: prevent invalid free when alloc fails 2010-08-30 19:55:09 +02:00
sha1.c lib/sha1.c: quiet sparse noise about symbol not declared 2011-09-13 16:09:41 -07:00
show_mem.c arch, mm: filter disallowed nodes from arch specific show_mem functions 2011-05-25 08:39:03 -07:00
smp_processor_id.c sched: Wrap scheduler p->cpus_allowed access 2011-10-06 12:46:56 +02:00
sort.c
spinlock_debug.c lib/spinlock_debug.c: print owner on spinlock lockup 2011-10-31 17:30:56 -07:00
string.c lib/string.c: fix strim() semantics for strings that have only blanks 2011-10-31 17:30:56 -07:00
string_helpers.c
swiotlb.c swiotlb: Export swioltb_nr_tbl and utilize it as appropiate. 2011-06-06 15:41:16 -04:00
syscall.c
test-kstrtox.c kstrtox: fix compile warnings in test 2011-04-14 16:06:54 -07:00
textsearch.c textsearch: doc - fix spelling in lib/textsearch.c. 2011-01-24 23:33:30 -08:00
timerqueue.c Fix common misspellings 2011-03-31 11:26:23 -03:00
ts_bm.c
ts_fsm.c
ts_kmp.c
uuid.c Unified UUID/GUID definition 2010-05-19 22:40:47 -04:00
vsprintf.c lib/kstrtox: common code between kstrto*() and simple_strto*() functions 2011-10-31 17:30:56 -07:00