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Johannes Weiner 64dd89ae01 mm/block/fs: remove laptop_mode 
Laptop mode was introduced to save battery, by delaying and consolidating
writes and thereby maximize the time rotating hard drives wouldn't have to
spin.

Luckily, rotating hard drives, with their high spin-up times and power
draw, are a thing of the past for battery-powered devices.  Reclaim has
also since changed to not write single filesystem pages anymore, and
regular filesystem writeback is lumpy by design.

The juice doesn't appear worth the squeeze anymore.  The footprint of the
feature is small, but nevertheless it's a complicating factor in mm,
block, filesystems.  Developers don't think about it, and it likely hasn't
been tested with new reclaim and writeback changes in years.

Let's sunset it.  Keep the sysctl with a deprecation warning around for a
few more cycles, but remove all functionality behind it.

[akpm@linux-foundation.org: fix Documentation/admin-guide/laptops/index.rst]
Link: https://lkml.kernel.org/r/20251216185201.GH905277@cmpxchg.org
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Suggested-by: Christoph Hellwig <hch@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Acked-by: Jens Axboe <axboe@kernel.dk>
Reviewed-by: Shakeel Butt <shakeel.butt@linux.dev>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Deepanshu Kartikey <kartikey406@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2026-01-20 19:24:47 -08:00
..
partitions block: use min() instead of min_t() 2025-11-20 07:44:29 -07:00
badblocks.c badblocks: Fix a nonsense WARN_ON() which checks whether a u64 variable < 0 2025-03-10 07:41:58 -06:00
bdev.c vfs-6.19-rc1.inode 2025-12-01 09:02:34 -08:00
bfq-cgroup.c block,bfq: fix aux stat accumulation destination 2025-12-28 09:03:51 -07:00
bfq-iosched.c block: fix race between wbt_enable_default and IO submission 2025-12-12 12:51:11 -07:00
bfq-iosched.h block, bfq: update outdated comment 2026-01-01 08:57:37 -07:00
bfq-wf2q.c block, bfq: inject I/O to underutilized actuators 2023-01-29 15:18:33 -07:00
bio-integrity-auto.c block: zero non-PI portion of auto integrity buffer 2026-01-10 10:22:07 -07:00
bio-integrity.c block: make bio auto-integrity deadlock safe 2025-11-04 12:41:50 -07:00
bio.c block: prohibit calls to bio_chain_endio 2025-12-09 10:20:03 -07:00
blk-cgroup-fc-appid.c block: Replace all non-returning strlcpy with strscpy 2023-06-01 09:13:31 -06:00
blk-cgroup-rwstat.c blk-cgroup: use group allocation/free of per-cpu counters API 2024-04-03 09:10:17 -06:00
blk-cgroup-rwstat.h blk-cgroup: rwstat: fix kernel-doc warnings in header file 2025-01-13 07:47:09 -07:00
blk-cgroup.c block: Remove elevator_lock usage from blkg_conf frozen operations 2025-10-15 08:00:19 -06:00
blk-cgroup.h block: initialize bio issue time in blk_mq_submit_bio() 2025-09-10 05:23:45 -06:00
blk-core.c block: fix typos in comments and strings in blk-core 2025-11-25 10:39:49 -07:00
blk-crypto-fallback.c blk-crypto: convert to use bio_submit_split_bioset() 2025-09-10 05:23:46 -06:00
blk-crypto-internal.h blk-crypto: add ioctls to create and prepare hardware-wrapped keys 2025-02-10 09:54:19 -07:00
blk-crypto-profile.c blk-crypto: export wrapped key functions 2025-05-06 19:08:08 +02:00
blk-crypto-sysfs.c blk-crypto: show supported key types in sysfs 2025-02-10 09:54:19 -07:00
blk-crypto.c blk-crypto: use BLK_STS_INVAL for alignment errors 2025-10-30 08:52:57 -06:00
blk-flush.c block: remove unused parameter 2025-03-12 08:25:28 -06:00
blk-ia-ranges.c block: get rid of request queue ->sysfs_dir_lock 2025-01-29 07:16:47 -07:00
blk-integrity.c block: don't merge bios with different app_tags 2026-01-06 19:10:08 -07:00
blk-ioc.c copy_process: pass clone_flags as u64 across calltree 2025-09-01 15:31:34 +02:00
blk-iocost.c block: use min() instead of min_t() 2025-11-20 07:44:29 -07:00
blk-iolatency.c blk-mq: add QUEUE_FLAG_BIO_ISSUE_TIME 2025-09-10 05:23:45 -06:00
blk-ioprio.c blk-cgroup: Simplify policy files registration 2025-03-11 09:22:55 -10:00
blk-ioprio.h blk-ioprio: remove per-disk structure 2024-07-28 16:47:51 -06:00
blk-lib.c block: fix memory leak in __blkdev_issue_zero_pages 2025-12-04 15:43:28 -07:00
blk-map.c block: use bio_alloc_bioset for passthru IO by default 2025-12-04 07:18:54 -07:00
blk-merge.c Revert "block: consider discard merge last" 2025-11-18 15:00:12 -07:00
blk-mq-cpumap.c blk-mq: add number of queue calc helper 2025-07-01 10:24:19 -06:00
blk-mq-debugfs.c blk-mq: add QUEUE_FLAG_BIO_ISSUE_TIME 2025-09-10 05:23:45 -06:00
blk-mq-debugfs.h block: Replace zone_wlock debugfs entry with zone_wplugs entry 2024-04-17 08:44:03 -06:00
blk-mq-dma.c block-6.19-20251211 2025-12-12 22:04:18 +12:00
blk-mq-sched.c block: use {alloc|free}_sched data methods 2025-11-13 09:27:49 -07:00
blk-mq-sched.h block: use {alloc|free}_sched data methods 2025-11-13 09:27:49 -07:00
blk-mq-sysfs.c blk-mq: Move flush queue allocation into blk_mq_init_hctx() 2025-09-08 08:05:32 -06:00
blk-mq-tag.c blk-mq: use array manage hctx map instead of xarray 2025-11-28 09:09:19 -07:00
blk-mq.c mm/block/fs: remove laptop_mode 2026-01-20 19:24:47 -08:00
blk-mq.h blk-mq: use queue_hctx in blk_mq_map_queue_type 2025-12-01 07:18:31 -07:00
blk-pm.c block: force noio scope in blk_mq_freeze_queue 2025-01-31 07:20:08 -07:00
blk-pm.h block: Remove unused blk_pm_*() function definitions 2021-02-22 06:33:48 -07:00
blk-rq-qos.c block: avoid cpu_hotplug_lock depedency on freeze_lock 2025-08-21 07:11:11 -06:00
blk-rq-qos.h blk-rq-qos: Remove unlikely() hints from QoS checks 2026-01-06 19:08:23 -07:00
blk-settings.c block: validate interval_exp integrity limit 2025-12-18 09:51:49 -07:00
blk-stat.c treewide, timers: Rename from_timer() to timer_container_of() 2025-06-08 09:07:37 +02:00
blk-stat.h treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
blk-sysfs.c block: fix race between wbt_enable_default and IO submission 2025-12-12 12:51:11 -07:00
blk-throttle.c block/blk-throttle: Remove throtl_slice from struct throtl_data 2025-11-17 09:39:48 -07:00
blk-throttle.h blk-throttle: fix access race during throttle policy activation 2025-09-08 08:24:44 -06:00
blk-timeout.c block: blk-timeout: delete duplicated word 2020-07-31 16:29:47 -06:00
blk-wbt.c block: fix race between wbt_enable_default and IO submission 2025-12-12 12:51:11 -07:00
blk-wbt.h block: fix race between wbt_enable_default and IO submission 2025-12-12 12:51:11 -07:00
blk-zoned.c block: fix cached zone reports on devices with native zone append 2025-12-09 22:35:54 -07:00
blk.h block: unify elevator tags and type xarrays into struct elv_change_ctx 2025-11-13 09:27:49 -07:00
bsg-lib.c block: remove unused parameter 'q' parameter in __blk_rq_map_sg() 2025-03-13 05:46:19 -06:00
bsg.c SCSI misc on 20230629 2023-06-30 11:57:07 -07:00
disk-events.c block: move bdev_mark_dead out of disk_check_media_change 2023-10-28 13:29:23 +02:00
early-lookup.c wrapper for access to ->bd_partno 2024-05-02 17:48:09 -04:00
elevator.c block: fix race between wbt_enable_default and IO submission 2025-12-12 12:51:11 -07:00
elevator.h block: fix race between wbt_enable_default and IO submission 2025-12-12 12:51:11 -07:00
fops.c block: enable per-cpu bio cache by default 2025-12-04 07:19:24 -07:00
genhd.c block: Remove references to __device_add_disk() 2025-11-25 10:36:37 -07:00
holder.c block: fix deadlock between bd_link_disk_holder and partition scan 2024-02-23 07:44:19 -07:00
ioctl.c block: add allocation size check in blkdev_pr_read_keys() 2025-12-17 07:35:22 -07:00
ioprio.c block: remove test of incorrect io priority level 2025-05-08 09:04:12 -06:00
Kconfig block: Remove obsolete configs BLK_MQ_{PCI,VIRTIO} 2025-05-14 05:43:56 -06:00
Kconfig.iosched block: Default to use cgroup support for BFQ 2023-01-30 09:42:42 -07:00
kyber-iosched.c block: define alloc_sched_data and free_sched_data methods for kyber 2025-11-13 09:27:49 -07:00
Makefile blk-mq: move the DMA mapping code to a separate file 2025-05-16 08:43:41 -06:00
mq-deadline.c block/mq-deadline: Switch back to a single dispatch list 2025-10-20 10:37:42 -06:00
opal_proto.h block: sed-opal: handle empty atoms when parsing response 2024-02-16 15:52:45 -07:00
sed-opal.c block: sed-opal: add ioctl IOC_OPAL_SET_SID_PW 2024-10-22 08:16:40 -06:00
t10-pi.c block: rename tuple_size field in blk_integrity to metadata_size 2025-07-01 14:00:14 +02:00