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590b9d576c
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Danilo Krummrich 590b9d576c mm: kvmalloc: align kvrealloc() with krealloc() 
Besides the obvious (and desired) difference between krealloc() and
kvrealloc(), there is some inconsistency in their function signatures and
behavior:

 - krealloc() frees the memory when the requested size is zero, whereas
   kvrealloc() simply returns a pointer to the existing allocation.

 - krealloc() behaves like kmalloc() if a NULL pointer is passed, whereas
   kvrealloc() does not accept a NULL pointer at all and, if passed,
   would fault instead.

 - krealloc() is self-contained, whereas kvrealloc() relies on the caller
   to provide the size of the previous allocation.

Inconsistent behavior throughout allocation APIs is error prone, hence
make kvrealloc() behave like krealloc(), which seems superior in all
mentioned aspects.

Besides that, implementing kvrealloc() by making use of krealloc() and
vrealloc() provides oppertunities to grow (and shrink) allocations more
efficiently.  For instance, vrealloc() can be optimized to allocate and
map additional pages to grow the allocation or unmap and free unused pages
to shrink the allocation.

[dakr@kernel.org: document concurrency restrictions]
  Link: https://lkml.kernel.org/r/20240725125442.4957-1-dakr@kernel.org
[dakr@kernel.org: disable KASAN when switching to vmalloc]
  Link: https://lkml.kernel.org/r/20240730185049.6244-2-dakr@kernel.org
[dakr@kernel.org: properly document __GFP_ZERO behavior]
  Link: https://lkml.kernel.org/r/20240730185049.6244-5-dakr@kernel.org
Link: https://lkml.kernel.org/r/20240722163111.4766-3-dakr@kernel.org
Signed-off-by: Danilo Krummrich <dakr@kernel.org>
Acked-by: Michal Hocko <mhocko@suse.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Chandan Babu R <chandan.babu@oracle.com>
Cc: Christian König <christian.koenig@amd.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Christoph Lameter <cl@linux.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Hyeonggon Yoo <42.hyeyoo@gmail.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Kees Cook <kees@kernel.org>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Miguel Ojeda <ojeda@kernel.org>
Cc: Oliver Upton <oliver.upton@linux.dev>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: Roman Gushchin <roman.gushchin@linux.dev>
Cc: Uladzislau Rezki <urezki@gmail.com>
Cc: Wedson Almeida Filho <wedsonaf@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2024-09-01 20:25:44 -07:00
..
842
crypto crypto: lib/mpi - delete unnecessary condition 2024-07-13 11:50:28 +12:00
dim dim: add new interfaces for initialization and getting results 2024-06-25 17:15:06 -07:00
fonts lib/fonts: Fix visiblity of SUN12x22 and TER16x32 if DRM_PANIC 2024-06-24 13:18:02 +02:00
kunit kunit: executor: Simplify string allocation handling 2024-07-12 10:11:48 -06:00
lz4
lzo
math - In the series "treewide: Refactor heap related implementation", 2024-07-21 17:56:22 -07:00
pldmfw
raid6 lib/raid6: use CC_FLAGS_FPU for NEON CFLAGS 2024-05-19 14:36:18 -07:00
reed_solomon
test_fortify
vdso random: vDSO: reject unknown getrandom() flags 2024-08-26 09:58:52 +02:00
xz
zlib_deflate lib/zlib: add missing MODULE_DESCRIPTION() macro 2024-07-04 23:43:11 -07:00
zlib_dfltcc lib/zlib: unpoison DFLTCC output buffers 2024-07-03 19:30:23 -07:00
zlib_inflate
zstd
.gitignore
alloc_tag.c sysctl changes for 6.11-rc1 2024-07-16 14:24:29 -07:00
argv_split.c
ashldi3.c
ashrdi3.c
asn1_decoder.c
asn1_encoder.c lib/asn1_encoder: add missing MODULE_DESCRIPTION() macro 2024-06-24 22:25:06 -07:00
assoc_array.c
atomic64_test.c KUnit: add missing MODULE_DESCRIPTION() macros for lib/*_test.ko 2024-06-24 22:25:06 -07:00
atomic64.c
audit.c
base64.c
bcd.c
bch.c lib/bch.c: use swap() to improve code 2024-07-12 16:39:53 -07:00
bitfield_kunit.c kunit: add missing MODULE_DESCRIPTION() macros to lib/*.c 2024-06-24 22:25:06 -07:00
bitmap-str.c
bitmap.c
bitrev.c
bootconfig-data.S
bootconfig.c bootconfig: Remove duplicate included header file linux/bootconfig.h 2024-07-12 08:55:02 +09:00
bsearch.c
btree.c minmax: make generic MIN() and MAX() macros available everywhere 2024-07-28 15:49:18 -07:00
bucket_locks.c
bug.c
build_OID_registry lib/build_OID_registry: avoid non-destructive substitution for Perl < 5.13.2 compat 2024-07-06 11:39:51 -07:00
buildid.c build-id: require program headers to be right after ELF header 2024-06-28 19:36:30 -07:00
bust_spinlocks.c
check_signature.c
checksum_kunit.c kunit: add missing MODULE_DESCRIPTION() macros to lib/*.c 2024-06-24 22:25:06 -07:00
checksum.c
closure.c closures: fix closure_sync + closure debugging 2024-07-10 09:53:39 -04:00
clz_ctz.c
clz_tab.c
cmdline_kunit.c kunit: add missing MODULE_DESCRIPTION() macros to lib/*.c 2024-06-24 22:25:06 -07:00
cmdline.c
cmpdi2.c
cmpxchg-emu.c lib: Add one-byte emulation function 2024-04-09 22:06:00 -07:00
codetag.c lib: add memory allocations report in show_mem() 2024-04-25 20:55:57 -07:00
compat_audit.c
cpu_rmap.c
cpumask_kunit.c lib: bitmap: add missing MODULE_DESCRIPTION() macros 2024-06-18 10:40:52 -07:00
cpumask.c
crc4.c
crc7.c
crc8.c
crc16.c
crc32.c
crc32defs.h
crc32test.c
crc64-rocksoft.c
crc64.c
crc-ccitt.c
crc-itu-t.c
crc-t10dif.c
ctype.c
debug_info.c
debug_locks.c
debugobjects.c debugobjects: Annotate racy debug variables 2024-06-24 16:46:43 +02:00
dec_and_lock.c
decompress_bunzip2.c decompress_bunzip2: fix rare decompression failure 2024-07-26 14:33:09 -07:00
decompress_inflate.c
decompress_unlz4.c
decompress_unlzma.c minmax: make generic MIN() and MAX() macros available everywhere 2024-07-28 15:49:18 -07:00
decompress_unlzo.c
decompress_unxz.c
decompress_unzstd.c
decompress.c
devmem_is_allowed.c
devres.c devres: don't use "proxy" headers 2024-04-25 21:07:06 -07:00
dhry_1.c
dhry_2.c
dhry_run.c KUnit: add missing MODULE_DESCRIPTION() macros for lib/test_*.ko 2024-06-24 22:25:11 -07:00
dhry.h
digsig.c
dump_stack.c lib/dump_stack: report process UID in dump_stack_print_info() 2024-06-24 22:25:11 -07:00
dynamic_debug.c dyndbg: fix old BUG_ON in >control parser 2024-04-30 09:20:48 +02:00
dynamic_queue_limits.c net: dqs: make struct dql more cache efficient 2024-04-15 11:19:53 -07:00
earlycpio.c
errname.c
error-inject.c
errseq.c
extable.c
fault-inject-usercopy.c
fault-inject.c
fdt_addresses.c
fdt_empty_tree.c
fdt_ro.c
fdt_rw.c
fdt_strerror.c
fdt_sw.c
fdt_wip.c
fdt.c
find_bit_benchmark.c lib: bitmap: add missing MODULE_DESCRIPTION() macros 2024-06-18 10:40:52 -07:00
find_bit.c bitmap patches for 6.10 2024-05-21 15:29:01 -07:00
flex_proportions.c
fortify_kunit.c mm: kvmalloc: align kvrealloc() with krealloc() 2024-09-01 20:25:44 -07:00
fw_table.c
gen_crc32table.c
gen_crc64table.c
genalloc.c
generic-radix-tree.c lib/generic-radix-tree.c: Fix rare race in __genradix_ptr_alloc() 2024-08-13 22:56:50 -04:00
glob.c
globtest.c
group_cpus.c
hashtable_test.c KUnit: add missing MODULE_DESCRIPTION() macros for lib/*_test.ko 2024-06-24 22:25:06 -07:00
hexdump.c
hweight.c
idr.c
inflate.c
interval_tree_test.c
interval_tree.c
iomap_copy.c s390: Stop using weak symbols for __iowrite64_copy() 2024-04-22 17:11:20 -03:00
iomap.c
iommu-helper.c
iov_iter.c
irq_poll.c
irq_regs.c
is_signed_type_kunit.c kunit: add missing MODULE_DESCRIPTION() macros to lib/*.c 2024-06-24 22:25:06 -07:00
is_single_threaded.c
kasprintf.c
Kconfig dim: make DIMLIB dependent on NET 2024-06-25 17:15:06 -07:00
Kconfig.debug - In the series "treewide: Refactor heap related implementation", 2024-07-21 17:56:22 -07:00
Kconfig.kasan
Kconfig.kcsan
Kconfig.kfence
Kconfig.kgdb kgdb: add HAS_IOPORT dependency 2024-04-25 21:07:05 -07:00
Kconfig.kmsan
Kconfig.ubsan ubsan: Restore dependency on ARCH_HAS_UBSAN 2024-05-18 13:46:10 -07:00
kfifo.c TTY/Serial changes for 6.10-rc1 2024-05-22 11:53:02 -07:00
klist.c
kobject_uevent.c kobject_uevent: Fix OOB access within zap_modalias_env() 2024-06-12 13:24:05 +02:00
kobject.c
kstrtox.c
kstrtox.h
kunit_iov_iter.c kunit: Fix KUNIT_SUCCESS() calls in iov_iter tests 2024-05-06 14:22:02 -06:00
libcrc32c.c
linear_ranges.c
list_debug.c
list_sort.c
list-test.c list: test: add the missing MODULE_DESCRIPTION() macro 2024-06-07 15:59:15 -06:00
llist.c
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-rtmutex.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
lockref.c
logic_iomem.c
logic_pio.c
lru_cache.c
lshrdi3.c
lwq.c
Makefile linux_kselftest-kunit-6.11-rc1 2024-07-16 17:42:14 -07:00
maple_tree.c maple_tree: modified return type of mas_wr_store_entry() 2024-07-03 19:30:19 -07:00
memcat_p.c
memcpy_kunit.c kunit/fortify: add missing MODULE_DESCRIPTION() macros 2024-06-24 22:25:05 -07:00
memory-notifier-error-inject.c
memregion.c
memweight.c
muldi3.c
net_utils.c
netdev-notifier-error-inject.c
nlattr.c
nmi_backtrace.c
notifier-error-inject.c
notifier-error-inject.h
objagg.c mlxsw: spectrum_acl_erp: Fix object nesting warning 2024-06-10 11:14:52 +01:00
objpool.c objpool: cache nr_possible_cpus() and avoid caching nr_cpu_ids 2024-05-01 23:18:48 +09:00
of-reconfig-notifier-error-inject.c
oid_registry.c
once.c
overflow_kunit.c kunit/overflow: Fix UB in overflow_allocation_test 2024-08-15 09:24:55 -07:00
packing.c
parman.c
parser.c
percpu_counter.c percpu_counter: add a cmpxchg-based _add_batch variant 2024-06-24 22:25:03 -07:00
percpu_test.c
percpu-refcount.c
plist.c lib/plist.c: avoid worst case scenario in plist_add 2024-06-24 22:25:10 -07:00
pm-notifier-error-inject.c
polynomial.c
radix-tree.c
radix-tree.h
random32.c
ratelimit.c
rbtree_test.c
rbtree.c lib/rbtree.c: fix the example typo 2024-07-04 23:43:10 -07:00
rcuref.c
ref_tracker.c
refcount.c
rhashtable.c rhashtable: plumb through alloc tag 2024-04-25 20:55:57 -07:00
sbitmap.c sbitmap: fix io hung due to race on sbitmap_word::cleared 2024-07-19 09:39:32 -06:00
scatterlist.c Fix a potential infinite loop in extract_user_to_sg() 2024-04-26 12:35:57 -07:00
seq_buf.c
sg_pool.c
sg_split.c
siphash_kunit.c siphash: add missing MODULE_DESCRIPTION() macro 2024-06-24 22:25:07 -07:00
siphash.c
slub_kunit.c mm, slab: don't wrap internal functions with alloc_hooks() 2024-05-28 09:27:50 +02:00
smp_processor_id.c
sort.c lib/sort: optimize heapsort for handling final 2 or 3 elements 2024-06-24 22:25:03 -07:00
stackdepot.c stackdepot: use gfp_nested_mask() instead of open coded masking 2024-05-19 14:40:44 -07:00
stackinit_kunit.c kunit: add missing MODULE_DESCRIPTION() macros to lib/*.c 2024-06-24 22:25:06 -07:00
stmp_device.c
string_helpers_kunit.c string: kunit: add missing MODULE_DESCRIPTION() macros 2024-06-28 08:54:55 -07:00
string_helpers.c
string_kunit.c string: kunit: add missing MODULE_DESCRIPTION() macros 2024-06-28 08:54:55 -07:00
string.c
strncpy_from_user.c
strnlen_user.c
syscall.c
test_bitmap.c lib: bitmap: add missing MODULE_DESCRIPTION() macros 2024-06-18 10:40:52 -07:00
test_bitops.c lib/test_bitops: Add benchmark test for fns() 2024-05-09 09:25:08 -07:00
test_bits.c KUnit: add missing MODULE_DESCRIPTION() macros for lib/test_*.ko 2024-06-24 22:25:11 -07:00
test_blackhole_dev.c KUnit: add missing MODULE_DESCRIPTION() macros for lib/test_*.ko 2024-06-24 22:25:11 -07:00
test_bpf.c - In the series "treewide: Refactor heap related implementation", 2024-07-21 17:56:22 -07:00
test_debug_virtual.c
test_dynamic_debug.c dyndbg: add missing MODULE_DESCRIPTION() macro 2024-06-04 17:40:02 +02:00
test_firmware.c KUnit: add missing MODULE_DESCRIPTION() macros for lib/test_*.ko 2024-06-24 22:25:11 -07:00
test_fprobe.c
test_fpu_glue.c selftests/fpu: add missing MODULE_DESCRIPTION() macro 2024-06-28 19:36:30 -07:00
test_fpu_impl.c selftests/fpu: move FP code to a separate translation unit 2024-05-19 14:36:20 -07:00
test_fpu.h selftests/fpu: move FP code to a separate translation unit 2024-05-19 14:36:20 -07:00
test_free_pages.c KUnit: add missing MODULE_DESCRIPTION() macros for lib/test_*.ko 2024-06-24 22:25:11 -07:00
test_hash.c KUnit: add missing MODULE_DESCRIPTION() macros for lib/test_*.ko 2024-06-24 22:25:11 -07:00
test_hexdump.c KUnit: add missing MODULE_DESCRIPTION() macros for lib/test_*.ko 2024-06-24 22:25:11 -07:00
test_hmm_uapi.h
test_hmm.c lib: test_hmm: add missing MODULE_DESCRIPTION() macro 2024-07-03 19:30:05 -07:00
test_ida.c KUnit: add missing MODULE_DESCRIPTION() macros for lib/test_*.ko 2024-06-24 22:25:11 -07:00
test_kmod.c lib/test_kmod: add missing MODULE_DESCRIPTION() macro 2024-06-24 22:25:07 -07:00
test_kprobes.c KUnit: add missing MODULE_DESCRIPTION() macros for lib/test_*.ko 2024-06-24 22:25:11 -07:00
test_linear_ranges.c lib/test_linear_ranges: add missing MODULE_DESCRIPTION() macro 2024-06-24 22:25:07 -07:00
test_list_sort.c KUnit: add missing MODULE_DESCRIPTION() macros for lib/test_*.ko 2024-06-24 22:25:11 -07:00
test_lockup.c
test_maple_tree.c test_maple_tree: add the missing MODULE_DESCRIPTION() macro 2024-07-03 19:30:05 -07:00
test_memcat_p.c KUnit: add missing MODULE_DESCRIPTION() macros for lib/test_*.ko 2024-06-24 22:25:11 -07:00
test_meminit.c KUnit: add missing MODULE_DESCRIPTION() macros for lib/test_*.ko 2024-06-24 22:25:11 -07:00
test_min_heap.c KUnit: add missing MODULE_DESCRIPTION() macros for lib/test_*.ko 2024-06-24 22:25:11 -07:00
test_module.c KUnit: add missing MODULE_DESCRIPTION() macros for lib/test_*.ko 2024-06-24 22:25:11 -07:00
test_objagg.c lib: test_objagg: Fix spelling 2024-06-10 11:14:52 +01:00
test_objpool.c
test_parman.c
test_printf.c vsprintf: add missing MODULE_DESCRIPTION() macro 2024-06-12 13:26:28 +02:00
test_ref_tracker.c KUnit: add missing MODULE_DESCRIPTION() macros for lib/test_*.ko 2024-06-24 22:25:11 -07:00
test_rhashtable.c lib/test_rhashtable: add missing MODULE_DESCRIPTION() macro 2024-06-03 18:51:18 -07:00
test_scanf.c vsprintf: add missing MODULE_DESCRIPTION() macro 2024-06-12 13:26:28 +02:00
test_sort.c KUnit: add missing MODULE_DESCRIPTION() macros for lib/test_*.ko 2024-06-24 22:25:11 -07:00
test_static_key_base.c KUnit: add missing MODULE_DESCRIPTION() macros for lib/test_*.ko 2024-06-24 22:25:11 -07:00
test_static_keys.c KUnit: add missing MODULE_DESCRIPTION() macros for lib/test_*.ko 2024-06-24 22:25:11 -07:00
test_sysctl.c KUnit: add missing MODULE_DESCRIPTION() macros for lib/test_*.ko 2024-06-24 22:25:11 -07:00
test_ubsan.c ubsan: add missing MODULE_DESCRIPTION() macro 2024-07-03 19:30:05 -07:00
test_uuid.c uuid: add missing MODULE_DESCRIPTION() macro 2024-06-24 22:25:06 -07:00
test_vmalloc.c
test_xarray.c test_xarray: add missing MODULE_DESCRIPTION() macro 2024-07-03 19:30:05 -07:00
test-kstrtox.c KUnit: add missing MODULE_DESCRIPTION() macros for lib/test_*.ko 2024-06-24 22:25:11 -07:00
textsearch.c
timerqueue.c
trace_readwrite.c
ts_bm.c lib/ts: add missing MODULE_DESCRIPTION() macros 2024-06-24 22:25:04 -07:00
ts_fsm.c lib/ts: add missing MODULE_DESCRIPTION() macros 2024-06-24 22:25:04 -07:00
ts_kmp.c lib/ts: add missing MODULE_DESCRIPTION() macros 2024-06-24 22:25:04 -07:00
ubsan.c ubsan: Add awareness of signed integer overflow traps 2024-04-15 17:42:43 -07:00
ubsan.h ubsan: Avoid i386 UBSAN handler crashes with Clang 2024-04-24 15:45:38 -07:00
ucmpdi2.c
ucs2_string.c
usercopy_kunit.c kunit/usercopy: Add missing MODULE_DESCRIPTION() 2024-07-02 10:11:45 -06:00
usercopy.c uaccess: always export _copy_[from|to]_user with CONFIG_RUST 2024-07-08 23:44:01 +02:00
uuid.c
vsprintf.c minmax: don't use max() in situations that want a C constant expression 2024-07-28 20:23:27 -07:00
win_minmax.c
xarray.c The usual shower of singleton fixes and minor series all over MM, 2024-05-19 09:21:03 -07:00
xxhash.c