David Hildenbrand b3c395ef55 mm/uaccess, mm/fault: Clarify that uaccess may only sleep if pagefaults are enabled ...

In general, non-atomic variants of user access functions must not sleep
if pagefaults are disabled.

Let's update all relevant comments in uaccess code. This also reflects
the might_sleep() checks in might_fault().

Reviewed-and-tested-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: David.Laight@ACULAB.COM
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: airlied@linux.ie
Cc: akpm@linux-foundation.org
Cc: benh@kernel.crashing.org
Cc: bigeasy@linutronix.de
Cc: borntraeger@de.ibm.com
Cc: daniel.vetter@intel.com
Cc: heiko.carstens@de.ibm.com
Cc: herbert@gondor.apana.org.au
Cc: hocko@suse.cz
Cc: hughd@google.com
Cc: mst@redhat.com
Cc: paulus@samba.org
Cc: ralf@linux-mips.org
Cc: schwidefsky@de.ibm.com
Cc: yang.shi@windriver.com
Link: http://lkml.kernel.org/r/1431359540-32227-4-git-send-email-dahi@linux.vnet.ibm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

2015-05-19 08:39:14 +02:00

..

fonts

fonts: Add 6x10 font

2014-10-09 11:35:48 +03:00

lz4

lib/lz4: Pull out constant tables

2015-03-25 15:04:57 +01:00

lzo

lzo: check for length overrun in variable length encoding.

2014-09-28 11:08:01 +02:00

mpi

MPILIB: Fix comparison of negative MPIs

2015-01-14 16:10:12 +00:00

raid6

md/raid6 algorithms: xor_syndrome() for SSE2

2015-04-22 08:00:42 +10:00

reed_solomon

…

xz

lib/xz: enable all filters by default in Kconfig

2014-06-04 16:54:18 -07:00

zlib_deflate

zlib: clean up some dead code

2014-08-06 18:01:24 -07:00

zlib_inflate

zlib: clean up some dead code

2014-08-06 18:01:24 -07:00

.gitignore

X.509: Implement simple static OID registry

2012-10-08 13:50:18 +10:30

argv_split.c

argv_split(): teach it to handle mutable strings

2013-04-29 18:28:19 -07:00

asn1_decoder.c

lib/asn1_decoder.c: kernel-doc warning fix

2014-06-04 16:54:19 -07:00

assoc_array.c

assoc_array: Include rcupdate.h for call_rcu() definition

2015-01-07 16:08:41 +00:00

atomic64_test.c

lib/atomic64_test.c: convert printk(KERN_INFO to pr_info

2014-06-04 16:54:19 -07:00

atomic64.c

locking,arch: Rewrite generic atomic support

2014-08-14 12:48:14 +02:00

audit.c

syscalls: implement execveat() system call

2014-12-13 12:42:51 -08:00

average.c

lib: Ensure EWMA does not store wrong intermediate values

2014-01-16 23:46:06 -08:00

bcd.c

usb/core: use bin2bcd() for bcdDevice in RH

2012-09-10 11:13:16 -07:00

bch.c

…

bitmap.c

lib/bitmap.c: bitmap_[empty,full]: remove code duplication

2015-04-17 09:03:56 -04:00

bitrev.c

ARM: 8187/1: add CONFIG_HAVE_ARCH_BITREVERSE to support rbit instruction

2014-12-22 16:43:06 +00:00

bsearch.c

lib: reduce the use of module.h wherever possible

2012-03-07 15:04:04 -05:00

btree.c

lib/btree.c: fix leak of whole btree nodes

2014-06-04 16:54:18 -07:00

bug.c

lib/bug: Use RCU list ops for module_bug_list

2014-11-11 17:07:46 +10:30

build_OID_registry

X.509: do not emit any informational output

2013-06-19 17:54:06 +02:00

bust_spinlocks.c

printk: Provide a wake_up_klogd() off-case

2013-03-22 16:41:20 -07:00

check_signature.c

lib: reduce the use of module.h wherever possible

2012-03-07 15:04:04 -05:00

checksum.c

lib/checksum.c: fix build for generic csum_tcpudp_nofold

2015-01-29 11:57:38 -08:00

clz_ctz.c

lib/clz_ctz.c: add prototype declarations in lib/clz_ctz.c

2014-04-03 16:21:12 -07:00

clz_tab.c

lib: Fix multiple definitions of clz_tab

2012-02-02 10:34:23 +11:00

cmdline.c

lib: Add a generic cmdline parse function parse_option_str

2014-10-03 18:40:58 +01:00

compat_audit.c

audit: Add generic compat syscall support

2014-03-20 10:11:35 -04:00

cordic.c

Docs: wording: functions -> algorithm

2011-10-29 21:20:22 +02:00

cpu_rmap.c

Remove GENERIC_HARDIRQ config option

2013-09-13 15:09:52 +02:00

cpu-notifier-error-inject.c

cpu: rewrite cpu-notifier-error-inject module

2012-07-30 17:25:22 -07:00

cpumask.c

This is the final removal (after several years!) of the obsolete cpus_*

2015-04-20 10:19:03 -07:00

crc7.c

lib/crc7: Shift crc7() output left 1 bit

2014-05-16 14:26:52 -04:00

crc8.c

lib: crc8: add new library module providing crc8 algorithm

2011-06-03 15:01:06 -04:00

crc16.c

…

crc32.c

lib: crc32: Add some additional __pure annotations

2014-06-25 16:04:00 -07:00

crc32defs.h

crc32: select an algorithm via Kconfig

2012-03-23 16:58:38 -07:00

crc-ccitt.c

…

crc-itu-t.c

…

crc-t10dif.c

crypto: crct10dif - Add fallback for broken initrds

2013-09-12 15:31:34 +10:00

ctype.c

lib: reduce the use of module.h wherever possible

2012-03-07 15:04:04 -05:00

debug_locks.c

mutex: Add support for wound/wait style locks

2013-06-26 12:10:56 +02:00

debugobjects.c

lib/debugobjects.c: convert printk(KERN_DEBUG to pr_debug

2014-06-04 16:53:53 -07:00

dec_and_lock.c

lib: reduce the use of module.h wherever possible

2012-03-07 15:04:04 -05:00

decompress_bunzip2.c

decompress_bunzip2: off by one in get_next_block()

2014-12-13 12:42:52 -08:00

decompress_inflate.c

initramfs: support initramfs that is bigger than 2GiB

2014-08-08 15:57:26 -07:00

decompress_unlz4.c

initramfs: support initramfs that is bigger than 2GiB

2014-08-08 15:57:26 -07:00

decompress_unlzma.c

initramfs: support initramfs that is bigger than 2GiB

2014-08-08 15:57:26 -07:00

decompress_unlzo.c

initramfs: support initramfs that is bigger than 2GiB

2014-08-08 15:57:26 -07:00

decompress_unxz.c

initramfs: support initramfs that is bigger than 2GiB

2014-08-08 15:57:26 -07:00

decompress.c

lib/decompress.c: consistency of compress formats for kernel image

2014-12-13 12:42:52 -08:00

devres.c

lib: devres: add a helper function for ioremap_wc

2015-03-16 21:11:32 +01:00

digsig.c

lib/digsig.c: kernel-doc warning fixes

2014-06-04 16:54:19 -07:00

div64.c

lib: correct link to the original source for div64_u64

2015-03-06 23:19:27 +01:00

dma-debug.c

lib/dma-debug: fix bucket_find_contain()

2015-04-17 09:03:54 -04:00

dump_stack.c

asmlinkage: Add explicit __visible to drivers/*, lib/*, kernel/*

2014-05-05 16:07:46 -07:00

dynamic_debug.c

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial

2015-02-10 18:57:15 -08:00

dynamic_queue_limits.c

lib/dynamic_queue_limits.c: simplify includes

2015-02-12 18:54:15 -08:00

earlycpio.c

earlycpio.c: Fix the confusing comment of find_cpio_data().

2013-08-14 23:24:01 +02:00

extable.c

…

fault-inject.c

fault-inject: add ratelimit option

2014-12-13 12:42:52 -08:00

fdt_empty_tree.c

lib: add fdt_empty_tree.c

2014-04-30 19:49:37 +01:00

fdt_ro.c

of/lib: Allow scripts/dtc/libfdt to be used from kernel code

2012-07-23 13:54:52 +01:00

fdt_rw.c

of/lib: Allow scripts/dtc/libfdt to be used from kernel code

2012-07-23 13:54:52 +01:00

fdt_strerror.c

of/lib: Allow scripts/dtc/libfdt to be used from kernel code

2012-07-23 13:54:52 +01:00

fdt_sw.c

of/lib: Allow scripts/dtc/libfdt to be used from kernel code

2012-07-23 13:54:52 +01:00

fdt_wip.c

of/lib: Allow scripts/dtc/libfdt to be used from kernel code

2012-07-23 13:54:52 +01:00

fdt.c

of/lib: Allow scripts/dtc/libfdt to be used from kernel code

2012-07-23 13:54:52 +01:00

find_bit.c

lib: rename lib/find_next_bit.c to lib/find_bit.c

2015-04-17 09:03:54 -04:00

flex_array.c

reciprocal_divide: update/correction of the algorithm

2014-01-21 23:17:20 -08:00

flex_proportions.c

proportions: add @gfp to init functions

2014-09-08 09:51:30 +09:00

gcd.c

lib/gcd.c: prevent possible div by 0

2012-10-06 03:04:57 +09:00

gen_crc32table.c

lib: crc32: constify crc32 lookup table

2015-02-13 21:21:35 -08:00

genalloc.c

lib/genalloc.c: check result of devres_alloc()

2015-02-13 21:21:36 -08:00

glob.c

lib/glob.c: add CONFIG_GLOB_SELFTEST

2014-08-06 18:01:25 -07:00

halfmd4.c

lib/halfmd4.c: simplify includes

2015-02-12 18:54:15 -08:00

hexdump.c

hexdump: make it return number of bytes placed in buffer

2015-02-12 18:54:15 -08:00

hweight.c

Make ARCH_HAS_FAST_MULTIPLIER a real config variable

2014-09-13 11:14:53 -07:00

idr.c

lib/idr.c: remove redundant include

2015-02-12 18:54:15 -08:00

inflate.c

…

int_sqrt.c

lib/int_sqrt.c: optimize square root algorithm

2013-04-29 18:28:19 -07:00

interval_tree_test.c

lib: Export interval_tree

2014-05-05 09:09:14 +02:00

interval_tree.c

lib/interval_tree.c: simplify includes

2015-02-12 18:54:15 -08:00

iomap_copy.c

lib: reduce the use of module.h wherever possible

2012-03-07 15:04:04 -05:00

iomap.c

Kconfig: rename HAS_IOPORT to HAS_IOPORT_MAP

2014-04-07 16:36:11 -07:00

iommu-common.c

iommu-common: rename iommu_pool_hash to iommu_hash_common

2015-04-20 14:09:55 -04:00

iommu-helper.c

The following text was taken from the original review request:

2012-03-24 10:24:31 -07:00

ioremap.c

x86, mm: support huge KVA mappings on x86

2015-04-14 16:49:04 -07:00

iov_iter.c

Merge branch 'iov_iter' into for-next

2015-04-11 22:26:51 -04:00

irq_regs.c

lib: reduce the use of module.h wherever possible

2012-03-07 15:04:04 -05:00

is_single_threaded.c

…

jedec_ddr_data.c

ddr: add LPDDR2 data from JESD209-2

2012-05-02 00:04:06 -07:00

kasprintf.c

lib/kasprintf.c: use kmalloc_track_caller() to get accurate traces for kvasprintf

2012-10-11 08:50:15 +09:00

Kconfig

This is the final removal (after several years!) of the obsolete cpus_*

2015-04-20 10:19:03 -07:00

Kconfig.debug

Merge branch 'core-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2015-05-06 10:26:37 -07:00

Kconfig.kasan

kasan: show gcc version requirements in Kconfig and Documentation

2015-05-05 17:10:10 -07:00

Kconfig.kgdb

kdb: Allow access to sensitive commands to be restricted by default

2014-11-11 09:31:52 -06:00

Kconfig.kmemcheck

…

kfifo.c

kfifo: use BUG_ON

2014-08-08 15:57:25 -07:00

klist.c

klist: use same naming scheme as hlist for klist_add_after()

2014-08-06 18:01:24 -07:00

kobject_uevent.c

lib/kobject_uevent.c: remove redundant include

2015-02-12 18:54:15 -08:00

kobject.c

kobject: WARN as tip when call kobject_get() to a kobject not initialized

2015-03-25 15:26:49 +01:00

kstrtox.c

lib/kstrtox.c: remove redundant cleanup

2014-01-23 16:36:57 -08:00

kstrtox.h

lib/kstrtox: common code between kstrto*() and simple_strto*() functions

2011-10-31 17:30:56 -07:00

lcm.c

block: fix blk_stack_limits() regression due to lcm() change

2015-03-31 09:45:50 -06:00

libcrc32c.c

crypto: LLVMLinux: Remove VLAIS usage from libcrc32c.c

2014-10-14 10:51:23 +02:00

list_debug.c

rcu: Fix broken strings in RCU's source code.

2012-07-06 06:01:49 -07:00

list_sort.c

lib/list_sort.c: rearrange includes

2015-02-12 18:54:15 -08:00

llist.c

lib/llist.c: remove redundant include

2015-02-12 18:54:15 -08:00

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/lockdep: Revert qrwlock recusive stuff

2014-10-03 06:09:30 +02:00

lockref.c

locking: Remove ACCESS_ONCE() usage

2015-02-24 08:44:16 +01:00

lru_cache.c

lru_cache: remove use of seq_printf return value

2015-04-15 16:35:25 -07:00

Makefile

Break up monolithic iommu table/lock into finer graularity pools and lock

2015-04-18 12:32:59 -07:00

md5.c

lib/md5.c: simplify include

2015-02-12 18:54:15 -08:00

memory-notifier-error-inject.c

memory: memory notifier error injection module

2012-07-30 17:25:22 -07:00

memweight.c

string: introduce memweight()

2012-07-30 17:25:16 -07:00

net_utils.c

mac_pton: Use bool not int return

2014-06-25 17:45:43 -07:00

nlattr.c

netlink: pad nla_memcpy dest buffer with zeroes

2015-03-31 14:07:24 -04:00

notifier-error-inject.c

mode_t, whack-a-mole at 11...

2013-04-09 14:13:05 -04:00

notifier-error-inject.h

fault-injection: notifier error injection

2012-07-30 17:25:22 -07:00

of-reconfig-notifier-error-inject.c

powerpc+of: Rename and fix OF reconfig notifier error inject module

2012-12-14 10:32:52 +11:00

oid_registry.c

Give the OID registry file module info to avoid kernel tainting

2013-05-05 14:38:00 -07:00

parser.c

lib/parser.c: put EXPORT_SYMBOLs in the conventional place

2014-01-23 16:36:55 -08:00

pci_iomap.c

pci: add pci_iomap_range

2015-01-21 16:28:49 +10:30

percpu_counter.c

percpu_counter: add @gfp to percpu_counter_init()

2014-09-08 09:51:29 +09:00

percpu_ida.c

lib/percpu_ida.c: remove redundant includes

2015-02-12 18:54:16 -08:00

percpu_test.c

percpu: add test module for various percpu operations

2013-11-13 12:09:11 +09:00

percpu-refcount.c

percpu_ref: make INIT_ATOMIC and switch_to_atomic() sticky

2014-09-24 13:31:50 -04:00

plist.c

lib/plist.c: remove redundant include

2015-02-12 18:54:16 -08:00

pm-notifier-error-inject.c

PM: PM notifier error injection module

2012-07-30 17:25:22 -07:00

proportions.c

proportions: add @gfp to init functions

2014-09-08 09:51:30 +09:00

radix-tree.c

sched/preempt: Merge preempt_mask.h into preempt.h

2015-05-19 08:39:11 +02:00

random32.c

random32: improvements to prandom_bytes

2014-08-24 18:36:01 -07:00

ratelimit.c

lib: reduce the use of module.h wherever possible

2012-03-07 15:04:04 -05:00

rational.c

lib: Change mail address of Oskar Schirmer

2012-05-17 15:18:37 +02:00

rbtree_test.c

rbtree/test: test rbtree_postorder_for_each_entry_safe()

2014-01-23 16:37:03 -08:00

rbtree.c

lib/rbtree.c: fix typo in comment of __rb_insert()

2014-08-08 15:57:24 -07:00

reciprocal_div.c

reciprocal_divide: update/correction of the algorithm

2014-01-21 23:17:20 -08:00

rhashtable.c

rhashtable: Do not schedule more than one rehash if we can't grow further

2015-04-22 14:17:22 -04:00

scatterlist.c

lib/scatterlist: fix memory leak with scsi-mq

2014-10-28 10:27:10 -06:00

seq_buf.c

seq_buf: Fix seq_buf_bprintf() truncation

2015-03-04 23:40:19 -05:00

sha1.c

lib: EXPORT_SYMBOL sha_init

2015-03-23 22:12:08 -04:00

show_mem.c

lib/show_mem.c: remove redundant include

2015-02-12 18:54:16 -08:00

smp_processor_id.c

percpu: add preemption checks to __this_cpu ops

2014-04-07 16:36:14 -07:00

sort.c

lib/sort.c: move include inside #if 0

2015-02-12 18:54:16 -08:00

stmp_device.c

lib/stmp_device.c: replace module.h include

2015-02-12 18:54:16 -08:00

string_helpers.c

SCSI misc on 20150416

2015-04-16 19:02:04 -04:00

string.c

lib: make memzero_explicit more robust against dead store elimination

2015-05-04 17:49:51 +08:00

strncpy_from_user.c

lib/strncpy_from_user.c: replace module.h include

2015-02-12 18:54:16 -08:00

strnlen_user.c

mm/uaccess, mm/fault: Clarify that uaccess may only sleep if pagefaults are enabled

2015-05-19 08:39:14 +02:00

swiotlb.c

swiotlb: don't assume PA 0 is invalid

2014-06-20 16:04:32 -04:00

syscall.c

lib/syscall.c: unexport task_current_syscall()

2014-04-03 16:21:06 -07:00

test_bpf.c

test: bpf: expand DIV_KX to DIV_MOD_KX

2014-12-08 20:23:22 -05:00

test_firmware.c

test: add firmware_class loader test

2014-07-17 18:44:19 -07:00

test_kasan.c

lib: add kasan test module

2015-02-13 21:21:41 -08:00

test_module.c

test: add minimal module for verification testing

2014-01-23 16:36:57 -08:00

test_rhashtable.c

test_rhashtable: Remove bogus max_size setting

2015-04-03 15:09:36 -04:00

test_user_copy.c

test: check copy_to/from_user boundary validation

2014-01-23 16:36:57 -08:00

test-hexdump.c

hexdump: avoid warning in test function

2015-04-19 13:48:40 -07:00

test-kstrtox.c

lib/test-kstrtox.c: use ARRAY_SIZE instead of sizeof/sizeof[0]

2014-08-06 18:01:25 -07:00

test-string_helpers.c

lib/string_helpers.c: change semantics of string_escape_mem

2015-04-15 16:35:24 -07:00

textsearch.c

lib/textsearch.c: remove textsearch_put reference from comments

2014-10-14 02:18:14 +02:00

timerqueue.c

The following text was taken from the original review request:

2012-03-24 10:24:31 -07:00

ts_bm.c

…

ts_fsm.c

…

ts_kmp.c

…

ucs2_string.c

Move utf16 functions to kernel core and rename

2013-04-15 21:23:03 +01:00

usercopy.c

Kconfig: consolidate CONFIG_DEBUG_STRICT_USER_COPY_CHECKS

2013-04-30 17:04:09 -07:00

uuid.c

uuid: use prandom_bytes()

2013-04-29 18:28:42 -07:00

vsprintf.c

lib/vsprintf.c: improve put_dec_trunc8 slightly

2015-04-17 09:03:55 -04:00