Matthew Wilcox (Oracle) b9c0e49abf mm: decline to manipulate the refcount on a slab page ... Slab pages now have a refcount of 0, so nobody should be trying to manipulate the refcount on them. Doing so has little effect; the object could be freed and reallocated to a different purpose, although the slab itself would not be until the refcount was put making it behave rather like TYPESAFE_BY_RCU. Unfortunately, __iov_iter_get_pages_alloc() does take a refcount. Fix that to not change the refcount, and make put_page() silently not change the refcount. get_page() warns so that we can fix any other callers that need to be changed. Long-term, networking needs to stop taking a refcount on the pages that it uses and rely on the caller to hold whatever references are necessary to make the memory stable. In the medium term, more page types are going to hav a zero refcount, so we'll want to move get_page() and put_page() out of line. Link: https://lkml.kernel.org/r/20250310143544.1216127-1-willy@infradead.org Fixes: 9aec2fb0fd (slab: allocate frozen pages) Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Reported-by: Hannes Reinecke <hare@suse.de> Closes: https://lore.kernel.org/all/08c29e4b-2f71-4b6d-8046-27e407214d8c@suse.com/ Acked-by: Vlastimil Babka <vbabka@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>		2025-03-16 17:40:26 -07:00
..
842	…
crypto	crypto: lib/aesgcm - Reduce stack usage in libaesgcm_init	2024-12-28 19:49:22 +08:00
dim	…
fonts	drm/log: select CONFIG_FONT_SUPPORT	2024-12-12 18:26:32 +01:00
kunit	linux_kselftest-kunit-6.14-rc1	2025-01-22 12:32:39 -08:00
lz4	include/linux/lz4.h: add some missing macros	2025-01-24 22:47:28 -08:00
lzo	…
math	lib/math: add int_sqrt test suite	2025-01-12 20:21:08 -08:00
pldmfw	pldmfw: enable selected component update	2025-01-16 13:04:41 -08:00
raid6	…
reed_solomon	…
test_fortify	…
tests	selftests: kallsyms: fix and clarify current test boundaries	2024-11-28 11:17:30 -08:00
vdso	…
xz	…
zlib_deflate	…
zlib_dfltcc	…
zlib_inflate	…
zstd	…
.gitignore	…
Kconfig	lib/crc32: remove other generic implementations	2025-01-29 09:10:35 -08:00
Kconfig.debug	Documentation: fix doc link to fault-injection.rst	2025-03-05 21:36:13 -08:00
Kconfig.kasan	kasan: delete CONFIG_KASAN_MODULE_TEST	2024-11-11 00:26:44 -08:00
Kconfig.kcsan	…
Kconfig.kfence	…
Kconfig.kgdb	Documentation: move dev-tools debugging files to process/debugging/	2024-12-17 13:46:53 -07:00
Kconfig.kmsan	…
Kconfig.ubsan	…
Makefile	revert "xarray: port tests to kunit"	2025-02-01 03:53:28 -08:00
alloc_tag.c	The various patchsets are summarized below. Plus of course many	2025-01-26 18:36:23 -08:00
argv_split.c	…
ashldi3.c	…
ashrdi3.c	…
asn1_decoder.c	…
asn1_encoder.c	…
assoc_array.c	…
atomic64.c	atomic64: Use arch_spin_locks instead of raw_spin_locks	2025-01-22 15:07:01 -05:00
atomic64_test.c	…
audit.c	…
base64.c	…
bcd.c	…
bch.c	…
bitfield_kunit.c	…
bitmap-str.c	…
bitmap.c	…
bitrev.c	…
bootconfig-data.S	…
bootconfig.c	…
bsearch.c	…
btree.c	…
bucket_locks.c	…
bug.c	…
build_OID_registry	…
buildid.c	…
bust_spinlocks.c	…
check_signature.c	…
checksum.c	…
checksum_kunit.c	…
closure.c	…
clz_ctz.c	…
clz_tab.c	…
cmdline.c	…
cmdline_kunit.c	…
cmpdi2.c	…
cmpxchg-emu.c	…
codetag.c	alloc_tag: support for page allocation tag compression	2024-11-07 14:25:16 -08:00
compat_audit.c	…
cpu_rmap.c	…
cpumask.c	mm/memblock: add memblock_alloc_or_panic interface	2025-01-25 20:22:38 -08:00
cpumask_kunit.c	…
crc-ccitt.c	…
crc-itu-t.c	…
crc-t10dif.c	lib/crc-t10dif: stop wrapping the crypto API	2024-12-01 17:23:13 -08:00
crc4.c	…
crc7.c	…
crc8.c	…
crc16.c	…
crc32.c	lib/crc32: remove other generic implementations	2025-01-29 09:10:35 -08:00
crc64-rocksoft.c	…
crc64.c	…
crc_kunit.c	lib/crc_kunit.c: add KUnit test suite for CRC library functions	2024-12-01 17:23:13 -08:00
ctype.c	…
debug_info.c	…
debug_locks.c	…
debugobjects.c	…
dec_and_lock.c	…
decompress.c	…
decompress_bunzip2.c	…
decompress_inflate.c	…
decompress_unlz4.c	…
decompress_unlzma.c	…
decompress_unlzo.c	…
decompress_unxz.c	…
decompress_unzstd.c	…
devmem_is_allowed.c	…
devres.c	…
dhry.h	…
dhry_1.c	…
dhry_2.c	…
dhry_run.c	…
digsig.c	…
dump_stack.c	…
dynamic_debug.c	…
dynamic_queue_limits.c	…
earlycpio.c	…
errname.c	…
error-inject.c	…
errseq.c	…
extable.c	…
fault-inject-usercopy.c	…
fault-inject.c	fault-inject: use prandom where cryptographically secure randomness is not needed	2025-01-12 20:21:00 -08:00
fdt.c	…
fdt_addresses.c	…
fdt_empty_tree.c	…
fdt_ro.c	…
fdt_rw.c	…
fdt_strerror.c	…
fdt_sw.c	…
fdt_wip.c	…
find_bit.c	…
find_bit_benchmark.c	…
flex_proportions.c	…
fortify_kunit.c	…
fw_table.c	…
gen_crc32table.c	lib/crc32: remove other generic implementations	2025-01-29 09:10:35 -08:00
gen_crc64table.c	…
genalloc.c	…
generic-radix-tree.c	…
glob.c	…
globtest.c	…
group_cpus.c	…
hashtable_test.c	…
hexdump.c	…
hweight.c	…
idr.c	…
inflate.c	lib/inflate.c: remove dead code	2025-01-12 20:21:15 -08:00
interval_tree.c	…
interval_tree_test.c	…
iomap.c	…
iomap_copy.c	…
iomem_copy.c	…
iommu-helper.c	…
iov_iter.c	mm: decline to manipulate the refcount on a slab page	2025-03-16 17:40:26 -07:00
irq_poll.c	…
irq_regs.c	…
is_signed_type_kunit.c	…
is_single_threaded.c	…
kasprintf.c	…
kfifo.c	…
klist.c	…
kobject.c	kobject: Remove unused functions	2025-01-14 19:45:35 +01:00
kobject_uevent.c	…
kstrtox.c	…
kstrtox.h	…
kunit_iov_iter.c	The various patchsets are summarized below. Plus of course many	2025-01-26 18:36:23 -08:00
linear_ranges.c	…
list-test.c	…
list_debug.c	lib/list_debug.c: add object information in case of invalid object	2025-01-25 20:22:23 -08:00
list_sort.c	lib/list_sort: clarify comparison function requirements in list_sort()	2025-01-24 22:47:23 -08:00
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	locking/ww_mutex: Fix ww_mutex dummy lockdep map selftest warnings	2024-12-02 12:16:57 +01:00
lockref.c	lockref: use bool for false/true returns	2025-01-16 11:48:11 +01:00
logic_iomem.c	…
logic_pio.c	…
lru_cache.c	…
lshrdi3.c	…
lwq.c	…
maple_tree.c	maple_tree: only root node could be deficient	2025-01-13 22:40:41 -08:00
memcat_p.c	…
memcpy_kunit.c	…
memory-notifier-error-inject.c	…
memregion.c	…
memweight.c	…
min_heap.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	…
objpool.c	objpool: fix to make percpu slot allocation more robust	2024-11-07 14:14:58 -08:00
of-reconfig-notifier-error-inject.c	…
oid_registry.c	…
once.c	…
overflow_kunit.c	Compiler Attributes: disable __counted_by for clang < 19.1.3	2024-11-19 08:48:27 -08:00
packing.c	lib: packing: add pack_fields() and unpack_fields()	2024-12-11 20:13:00 -08:00
packing_test.c	lib: packing: add pack_fields() and unpack_fields()	2024-12-11 20:13:00 -08:00
parman.c	…
parser.c	Documentation: core-api: add generic parser docbook	2024-12-11 09:07:40 -07:00
percpu-refcount.c	…
percpu_counter.c	…
percpu_test.c	percpu: add a test case for the specific 64-bit value addition	2024-11-06 20:11:14 -08:00
plist.c	…
pm-notifier-error-inject.c	…
polynomial.c	…
radix-tree.c	…
radix-tree.h	…
random32.c	Random number generator updates for Linux 6.13-rc1.	2024-11-19 10:43:44 -08:00
ratelimit.c	…
rbtree.c	…
rbtree_test.c	…
rcuref.c	rcuref: Plug slowpath race in rcuref_put()	2025-01-29 15:21:31 +01:00
ref_tracker.c	…
refcount.c	…
rhashtable.c	Mainly individually changelogged singleton patches. The patch series in	2025-01-26 17:50:53 -08:00
sbitmap.c	…
scatterlist.c	lib/scatterlist: use sg_phys() helper	2024-11-05 17:12:40 -08:00
seq_buf.c	…
sg_pool.c	…
sg_split.c	…
siphash.c	…
siphash_kunit.c	…
slub_kunit.c	mm/slub, kunit: Add testcase for krealloc redzone and zeroing	2024-11-16 21:19:39 +01:00
smp_processor_id.c	…
sort.c	lib/sort: clarify comparison function requirements in sort_r()	2025-01-24 22:47:23 -08:00
stackdepot.c	stackdepot: fix stack_depot_save_flags() in NMI context	2024-12-05 19:54:45 -08:00
stackinit_kunit.c	stackinit: Fix comment for test_small_end	2025-02-06 11:36:25 -08:00
stmp_device.c	…
string.c	strscpy: write destination buffer only once	2024-12-01 12:17:16 -08:00
string_helpers.c	…
string_helpers_kunit.c	…
string_kunit.c	…
strncpy_from_user.c	kasan: move checks to do_strncpy_from_user	2024-11-11 00:26:43 -08:00
strnlen_user.c	…
syscall.c	…
test-kstrtox.c	…
test_bitmap.c	…
test_bitops.c	…
test_bits.c	…
test_blackhole_dev.c	…
test_bpf.c	bpf/tests: Add 32 bits only long conditional jump tests	2025-01-06 16:10:19 +01:00
test_debug_virtual.c	…
test_dynamic_debug.c	…
test_firmware.c	module: Convert symbol namespace to string literal	2024-12-02 11:34:44 -08:00
test_fprobe.c	fprobe: Rewrite fprobe on function-graph tracer	2024-12-26 10:50:05 -05:00
test_fpu.h	…
test_fpu_glue.c	…
test_fpu_impl.c	…
test_free_pages.c	…
test_hash.c	…
test_hexdump.c	…
test_hmm.c	…
test_hmm_uapi.h	…
test_ida.c	…
test_kmod.c	…
test_kprobes.c	…
test_linear_ranges.c	…
test_list_sort.c	…
test_lockup.c	…
test_maple_tree.c	test_maple_tree: test exhausted upper limit of mtree_alloc_cyclic()	2025-01-25 20:22:19 -08:00
test_memcat_p.c	…
test_meminit.c	…
test_min_heap.c	lib/test_min_heap: use inline min heap variants to reduce attack vector	2025-01-12 20:20:57 -08:00
test_module.c	…
test_objagg.c	…
test_objpool.c	lib: test_objpool: Use kthread_run_on_cpu()	2025-01-02 22:12:12 +01:00
test_parman.c	…
test_printf.c	…
test_ref_tracker.c	…
test_rhashtable.c	…
test_scanf.c	…
test_sort.c	…
test_static_key_base.c	…
test_static_keys.c	…
test_sysctl.c	treewide: const qualify ctl_tables where applicable	2025-01-28 13:48:37 +01:00
test_ubsan.c	…
test_uuid.c	…
test_vmalloc.c	mm: alloc_pages_bulk: rename API	2025-01-25 20:22:31 -08:00
test_xarray.c	test_xarray: fix failure in check_pause when CONFIG_XARRAY_MULTI is not defined	2025-02-17 22:40:04 -08:00
textsearch.c	…
timerqueue.c	…
trace_readwrite.c	…
ts_bm.c	…
ts_fsm.c	…
ts_kmp.c	…
ubsan.c	…
ubsan.h	…
ucmpdi2.c	…
ucs2_string.c	…
union_find.c	…
usercopy.c	…
usercopy_kunit.c	…
util_macros_kunit.c	lib: util_macros_kunit: add kunit test for util_macros.h	2024-11-11 17:17:05 -08:00
uuid.c	…
vsprintf.c	vsnprintf: fix the number base for non-numeric formats	2025-01-13 08:23:28 -08:00
win_minmax.c	rxrpc: Generate rtt_min	2024-12-09 13:48:29 -08:00
xarray.c	Xarray: use xa_mark_t in xas_squash_marks() to keep code consistent	2025-01-24 22:47:28 -08:00
xxhash.c	…