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Merge branch 'akpm' (patches from Andrew)
Merge second patchbomb from Andrew Morton: - the rest of MM - various misc bits - add ability to run /sbin/reboot at reboot time - printk/vsprintf changes - fiddle with seq_printf() return value * akpm: (114 commits) parisc: remove use of seq_printf return value lru_cache: remove use of seq_printf return value tracing: remove use of seq_printf return value cgroup: remove use of seq_printf return value proc: remove use of seq_printf return value s390: remove use of seq_printf return value cris fasttimer: remove use of seq_printf return value cris: remove use of seq_printf return value openrisc: remove use of seq_printf return value ARM: plat-pxa: remove use of seq_printf return value nios2: cpuinfo: remove use of seq_printf return value microblaze: mb: remove use of seq_printf return value ipc: remove use of seq_printf return value rtc: remove use of seq_printf return value power: wakeup: remove use of seq_printf return value x86: mtrr: if: remove use of seq_printf return value linux/bitmap.h: improve BITMAP_{LAST,FIRST}_WORD_MASK MAINTAINERS: CREDITS: remove Stefano Brivio from B43 .mailmap: add Ricardo Ribalda CREDITS: add Ricardo Ribalda Delgado ...
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‎.mailmap‎

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@@ -100,6 +100,7 @@ Rajesh Shah <[email protected]>
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Ralf Baechle <[email protected]>
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Ralf Wildenhues <[email protected]>
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Rémi Denis-Courmont <[email protected]>
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Ricardo Ribalda Delgado <[email protected]>
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Rudolf Marek <[email protected]>
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Rui Saraiva <[email protected]>
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Sachin P Sant <[email protected]>

‎CREDITS‎

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W: http://paulbristow.net/linux/idefloppy.html
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D: Maintainer of IDE/ATAPI floppy driver
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N: Stefano Brivio
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E: [email protected]
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D: Broadcom B43 driver
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N: Dominik Brodowski
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E: [email protected]
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W: http://www.brodo.de/
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D: Generic Z8530 driver, AX.25 DAMA slave implementation
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D: Several AX.25 hacks
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N: Ricardo Ribalda Delgado
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E: [email protected]
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W: http://ribalda.com
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D: PLX USB338x driver
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D: PCA9634 driver
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D: Option GTM671WFS
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D: Fintek F81216A
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D: Various kernel hacks
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S: Qtechnology A/S
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S: Valby Langgade 142
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S: 2500 Valby
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S: Denmark
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N: Francois-Rene Rideau
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E: [email protected]
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W: http://www.tunes.org/~fare

‎Documentation/ABI/obsolete/sysfs-block-zram‎

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What: /sys/block/zram<id>/num_reads
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Date: August 2015
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Contact: Sergey Senozhatsky <[email protected]>
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Description:
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The num_reads file is read-only and specifies the number of
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reads (failed or successful) done on this device.
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Now accessible via zram<id>/stat node.
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What: /sys/block/zram<id>/num_writes
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Date: August 2015
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Contact: Sergey Senozhatsky <[email protected]>
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Description:
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The num_writes file is read-only and specifies the number of
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writes (failed or successful) done on this device.
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Now accessible via zram<id>/stat node.
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What: /sys/block/zram<id>/invalid_io
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Date: August 2015
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Contact: Sergey Senozhatsky <[email protected]>
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Description:
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The invalid_io file is read-only and specifies the number of
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non-page-size-aligned I/O requests issued to this device.
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Now accessible via zram<id>/io_stat node.
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What: /sys/block/zram<id>/failed_reads
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Date: August 2015
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Contact: Sergey Senozhatsky <[email protected]>
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Description:
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The failed_reads file is read-only and specifies the number of
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failed reads happened on this device.
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Now accessible via zram<id>/io_stat node.
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What: /sys/block/zram<id>/failed_writes
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Date: August 2015
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Contact: Sergey Senozhatsky <[email protected]>
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Description:
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The failed_writes file is read-only and specifies the number of
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failed writes happened on this device.
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Now accessible via zram<id>/io_stat node.
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What: /sys/block/zram<id>/notify_free
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Date: August 2015
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Contact: Sergey Senozhatsky <[email protected]>
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Description:
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The notify_free file is read-only. Depending on device usage
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scenario it may account a) the number of pages freed because
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of swap slot free notifications or b) the number of pages freed
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because of REQ_DISCARD requests sent by bio. The former ones
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are sent to a swap block device when a swap slot is freed, which
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implies that this disk is being used as a swap disk. The latter
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ones are sent by filesystem mounted with discard option,
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whenever some data blocks are getting discarded.
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Now accessible via zram<id>/io_stat node.
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What: /sys/block/zram<id>/zero_pages
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Date: August 2015
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Contact: Sergey Senozhatsky <[email protected]>
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Description:
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The zero_pages file is read-only and specifies number of zero
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filled pages written to this disk. No memory is allocated for
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such pages.
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Now accessible via zram<id>/mm_stat node.
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What: /sys/block/zram<id>/orig_data_size
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Date: August 2015
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Contact: Sergey Senozhatsky <[email protected]>
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Description:
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The orig_data_size file is read-only and specifies uncompressed
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size of data stored in this disk. This excludes zero-filled
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pages (zero_pages) since no memory is allocated for them.
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Unit: bytes
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Now accessible via zram<id>/mm_stat node.
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What: /sys/block/zram<id>/compr_data_size
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Date: August 2015
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Contact: Sergey Senozhatsky <[email protected]>
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Description:
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The compr_data_size file is read-only and specifies compressed
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size of data stored in this disk. So, compression ratio can be
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calculated using orig_data_size and this statistic.
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Unit: bytes
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Now accessible via zram<id>/mm_stat node.
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What: /sys/block/zram<id>/mem_used_total
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Date: August 2015
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Contact: Sergey Senozhatsky <[email protected]>
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Description:
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The mem_used_total file is read-only and specifies the amount
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of memory, including allocator fragmentation and metadata
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overhead, allocated for this disk. So, allocator space
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efficiency can be calculated using compr_data_size and this
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statistic.
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Unit: bytes
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Now accessible via zram<id>/mm_stat node.
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What: /sys/block/zram<id>/mem_used_max
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Date: August 2015
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Contact: Sergey Senozhatsky <[email protected]>
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Description:
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The mem_used_max file is read/write and specifies the amount
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of maximum memory zram have consumed to store compressed data.
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For resetting the value, you should write "0". Otherwise,
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you could see -EINVAL.
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Unit: bytes
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Downgraded to write-only node: so it's possible to set new
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value only; its current value is stored in zram<id>/mm_stat
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node.
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What: /sys/block/zram<id>/mem_limit
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Date: August 2015
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Contact: Sergey Senozhatsky <[email protected]>
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Description:
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The mem_limit file is read/write and specifies the maximum
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amount of memory ZRAM can use to store the compressed data.
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The limit could be changed in run time and "0" means disable
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the limit. No limit is the initial state. Unit: bytes
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Downgraded to write-only node: so it's possible to set new
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value only; its current value is stored in zram<id>/mm_stat
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node.

‎Documentation/ABI/testing/sysfs-block-zram‎

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amount of memory ZRAM can use to store the compressed data. The
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limit could be changed in run time and "0" means disable the
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limit. No limit is the initial state. Unit: bytes
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What: /sys/block/zram<id>/compact
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Date: August 2015
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Contact: Minchan Kim <[email protected]>
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Description:
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The compact file is write-only and trigger compaction for
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allocator zrm uses. The allocator moves some objects so that
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it could free fragment space.
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What: /sys/block/zram<id>/io_stat
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Date: August 2015
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Contact: Sergey Senozhatsky <[email protected]>
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Description:
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The io_stat file is read-only and accumulates device's I/O
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statistics not accounted by block layer. For example,
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failed_reads, failed_writes, etc. File format is similar to
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block layer statistics file format.
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What: /sys/block/zram<id>/mm_stat
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Date: August 2015
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Contact: Sergey Senozhatsky <[email protected]>
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Description:
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The mm_stat file is read-only and represents device's mm
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statistics (orig_data_size, compr_data_size, etc.) in a format
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similar to block layer statistics file format.

‎Documentation/blockdev/zram.txt‎

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mount /dev/zram1 /tmp
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7) Stats:
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Per-device statistics are exported as various nodes under
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/sys/block/zram<id>/
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disksize
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num_reads
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num_writes
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failed_reads
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failed_writes
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invalid_io
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notify_free
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zero_pages
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orig_data_size
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compr_data_size
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mem_used_total
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mem_used_max
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Per-device statistics are exported as various nodes under /sys/block/zram<id>/
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A brief description of exported device attritbutes. For more details please
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read Documentation/ABI/testing/sysfs-block-zram.
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Name access description
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---- ------ -----------
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disksize RW show and set the device's disk size
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initstate RO shows the initialization state of the device
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reset WO trigger device reset
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num_reads RO the number of reads
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failed_reads RO the number of failed reads
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num_write RO the number of writes
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failed_writes RO the number of failed writes
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invalid_io RO the number of non-page-size-aligned I/O requests
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max_comp_streams RW the number of possible concurrent compress operations
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comp_algorithm RW show and change the compression algorithm
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notify_free RO the number of notifications to free pages (either
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slot free notifications or REQ_DISCARD requests)
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zero_pages RO the number of zero filled pages written to this disk
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orig_data_size RO uncompressed size of data stored in this disk
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compr_data_size RO compressed size of data stored in this disk
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mem_used_total RO the amount of memory allocated for this disk
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mem_used_max RW the maximum amount memory zram have consumed to
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store compressed data
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mem_limit RW the maximum amount of memory ZRAM can use to store
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the compressed data
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num_migrated RO the number of objects migrated migrated by compaction
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WARNING
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=======
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per-stat sysfs attributes are considered to be deprecated.
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The basic strategy is:
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-- the existing RW nodes will be downgraded to WO nodes (in linux 4.11)
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-- deprecated RO sysfs nodes will eventually be removed (in linux 4.11)
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The list of deprecated attributes can be found here:
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Documentation/ABI/obsolete/sysfs-block-zram
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Basically, every attribute that has its own read accessible sysfs node
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(e.g. num_reads) *AND* is accessible via one of the stat files (zram<id>/stat
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or zram<id>/io_stat or zram<id>/mm_stat) is considered to be deprecated.
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User space is advised to use the following files to read the device statistics.
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File /sys/block/zram<id>/stat
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Represents block layer statistics. Read Documentation/block/stat.txt for
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details.
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File /sys/block/zram<id>/io_stat
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The stat file represents device's I/O statistics not accounted by block
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layer and, thus, not available in zram<id>/stat file. It consists of a
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single line of text and contains the following stats separated by
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whitespace:
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failed_reads
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failed_writes
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invalid_io
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notify_free
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File /sys/block/zram<id>/mm_stat
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The stat file represents device's mm statistics. It consists of a single
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line of text and contains the following stats separated by whitespace:
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orig_data_size
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compr_data_size
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mem_used_total
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mem_limit
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mem_used_max
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zero_pages
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num_migrated
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8) Deactivate:
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swapoff /dev/zram0

‎Documentation/filesystems/Locking‎

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void (*close)(struct vm_area_struct*);
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int (*fault)(struct vm_area_struct*, struct vm_fault *);
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int (*page_mkwrite)(struct vm_area_struct *, struct vm_fault *);
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int (*pfn_mkwrite)(struct vm_area_struct *, struct vm_fault *);
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int (*access)(struct vm_area_struct *, unsigned long, void*, int, int);
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locking rules:
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fault: yes can return with page locked
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map_pages: yes
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page_mkwrite: yes can return with page locked
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pfn_mkwrite: yes
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access: yes
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->fault() is called when a previously not present pte is about
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like the ->fault() handler, but simply return with VM_FAULT_NOPAGE, which
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will cause the VM to retry the fault.
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->pfn_mkwrite() is the same as page_mkwrite but when the pte is
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VM_PFNMAP or VM_MIXEDMAP with a page-less entry. Expected return is
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VM_FAULT_NOPAGE. Or one of the VM_FAULT_ERROR types. The default behavior
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after this call is to make the pte read-write, unless pfn_mkwrite returns
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an error.
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->access() is called when get_user_pages() fails in
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access_process_vm(), typically used to debug a process through
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/proc/pid/mem or ptrace. This function is needed only for

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