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asas1asas200
92b646ed64
proc_ops: Be aware of kernel API changes (#13) 
The proc_ops structure is defined in <include/linux/proc_fs.h> since
Linux v5.6+.
In older kernels, file_operations structure is used for custom hooks in
/proc file system. However, it contains some members that are unnecessary
in VFS, and every time VFS expands file_operations set, /proc code comes
bloated.

On the other hand, not only the space, but also some operations were
saved by this structure to improve its performance.
 2021-08-06 18:08:05 +08:00
Jim Huang
a411938b73
Merge pull request #43 from dancek/master 
Rewrite CSS to support scaling
 2021-08-05 20:50:22 +08:00
Hannu Hartikainen
e5e103a89b Rewrite CSS to support scaling 
This changes the layout to use the default font size with a reasonable
max width and margins around the body. Elements that would overflow on
narrow displays are changed to wrap (.author) or present a scroll bar as
necessary (figure, .verbatim, .fancyvrb). The properties on html and
body are set such that there is no full-document vertical scrolling.
Inline math is displayed in the same size as the surrounding text.
 2021-08-05 14:07:16 +03:00
Jim Huang
466e8a00fd cat_nonblock: Use canonical name scheme and fix unintended assignment 2021-08-05 14:28:12 +08:00
Jim Huang
38586974ee
Merge pull request #39 from fdgkhdkgh/master 
Fix typo
 2021-08-05 02:39:09 +08:00
吳建興
634c3659a8
Fix typo. 2021-08-05 02:16:36 +08:00
RinHizakura
5940dd9faa
Revise hello-5 and its output (#38) 
For the example module hello_5, the book showed the incorrect output
in corresponding with its execution results.

In addition, this patch changes from myintArray[2] = {-1, -1} to
myintArray[2] = {420, 420}, which help the readers distinguish from
the kernel messages.
 2021-08-04 23:42:10 +08:00
Jim Huang
40f0ff3087
Merge pull request #37 from fdgkhdkgh/master 
Fix typo
 2021-08-04 10:03:06 +08:00
吳建興
a7f81a2cfc
Fix typo. 
There is a typo in chapter 0.6.3.
 2021-08-04 09:33:21 +08:00
Jim Huang
7c129a4276 Minor wording tweak 2021-08-03 06:29:52 +08:00
demonsome
45769753d3
procfs1: Fix parameter descriptions (#34) 
In "procfs1.c," the "buffer" is actually the second parameter of procfile_read().
The "offset" is the fourth one.
 2021-08-02 23:01:34 +08:00
demonsome
65a8f5a1d6
Unify device node name "/proc/helloworld" (#33) 
The file name "proc helloworld" was not consistent with that of the later
sentences. The latter sentences use the device node name "/proc/helloworld".
 2021-08-02 22:59:19 +08:00
Jim Huang
970ddaba0b Mention the online publication 2021-08-02 15:15:49 +08:00
Jim Huang
859af5f727
Merge pull request #32 from focaaby/master 
Publish GitHub Pages with GitHub Actions
 2021-08-02 14:17:59 +08:00
Jerry Wang
937acfa0d7 Publish GitHub Page with GitHub Action 
Add a new Github Action to publish to the GitHub page. Use twtug/lkmpg
image for reproducibility.

Ref:
- sysprog21#27
- https://github.com/TeXtw/docker-lkmpg
 2021-08-02 06:22:29 +01:00
Jim Huang
749f0392bb Tidy section: system calls 2021-08-02 02:57:31 +08:00
Jim Huang
6689090085 Tidy section: device files 2021-08-02 02:43:35 +08:00
fennecJ
044cfefe65
Generate HTML via make4ht (#20) 
This patch generates HTML files with "make4ht" in the "html" directory.

Known issues with "make4ht":
Running "make4ht -suf html5 -d html lkmpg.tex" will cause the following
flaws:
1. The layout was unsatisfying.
2. After parsing TeX, it stoped at "\tableofcontents" with errors.
3. Several unneeded files were generated.
4. No way to specify the destination filename for HTML generation.

Solutions/workaround:
1. Use customized configuration file "html.cfg" to specify the layout style.
2. Turn off the \tableofcontents section when using make4ht. However, this
    results in the lack of table of contents in HTML. It can be fixed by
    appending "\Configure{tableofcontents*}{chapter,section,subsection}"
    to configuration file.
3. The build system removes the temporary files.
4. Use a symbolic link "index.html" to "lkmpg.html".
 2021-08-02 02:42:39 +08:00
Hsin-Hsiang Peng
d097d0c472
Add package xparse (#31) 
The package xparse should be included since
\NewDocumentCommand is part of it
 2021-08-02 02:24:09 +08:00
Jim Huang
4639ca1b26 Remove out-of-date versioing scheme 2021-08-01 22:41:28 +08:00
Jim Huang
fd80247ec8
Merge pull request #29 from ekangmonyet/master 
Delete existing release asset before releasing
 2021-08-01 22:21:42 +08:00
Ekang Monyet
7ee66c559f Delete existing release asset before releasing 
Use mknejp/delete-release-assets to delete existing asset.
This approach might not be optimal if softprops/action-gh-release
supports upserting [1].

[1] https://github.com/softprops/action-gh-release/pull/134
 2021-08-01 21:05:47 +08:00
ekangmonyet
0fce98f6d2
Dockerized PDF deployment in GitHub Actions (#28) 
Add a new GitHub Action to build and release the PDF file after every
push to master.  Use texlive/texlive docker image for the sake of
reproducibility in preparation for future build tools like make4ht .

Progress #27 - Reproducible TeX build environment using Docker
 2021-08-01 19:39:12 +08:00
Jim Huang
6026699a40 Tidy section: Character Device drivers 2021-08-01 16:21:01 +08:00
Jim Huang
4257b6ddcb Tidy section: Preliminaries 2021-08-01 15:03:49 +08:00
Jim Huang
09bde29531 Zircon kernel was formerly called Magenta 
The renaming appeared in 2017.
 2021-08-01 14:15:59 +08:00
Jim Huang
a949659e53
Merge pull request #24 from fennecJ/patch 
Fix grammar
 2021-07-31 23:39:03 +08:00
fennecj
5d2f428cff Fix grammar 2021-07-31 23:19:44 +08:00
demonsome
50e9d9176f
chardev: Revise comment on device node (#23) 
The device file create in this example is "chardev". 
So input command "sudo cat /dev/chardev" will get a valid message
"I already told you %d times Hello world!"
 2021-07-31 23:03:16 +08:00
fennecJ
a4af7b5e5a
Fix dead link (#21) 2021-07-30 14:47:22 +08:00
Jim Huang
377ec93a05 Add information for contributing 2021-07-30 13:45:58 +08:00
Jim Huang
b50323330c
Merge pull request #19 from fennecJ/master 
Fix typo
 2021-07-30 00:40:58 +08:00
fennecj
69b40b7bda Fix typo 2021-07-29 19:52:22 +08:00
linD026
c7a7a667cf
Avoid strlen by assigning explicit length of string for proc_read (#18) 
Since the address of buffer is userspace address, it may trigger an unexpected fault on strlen(buffer).

On Ubuntu 20.04.2 LTS ( 5.8.0-63-generic ), using strlen(buffer) will result in the following:
[ 2168.010930] /proc/buffer1k created
[ 2177.014347] BUG: unable to handle page fault for address: 00007fbbc2a17000
[ 2177.014355] #PF: supervisor read access in kernel mode
[ 2177.014358] #PF: error_code(0x0000) - not-present page
[ 2177.014361] PGD 80000003c61d0067 P4D 80000003c61d0067 PUD 3ee6c5067 PMD 40e1ff067 PTE 0
[ 2177.014369] Oops: 0000 [#1] SMP PTI
[ 2177.014376] CPU: 7 PID: 4750 Comm: cat Tainted: P        W  OE     5.8.0-63-generic #71~20.04.1-Ubuntu

[ 2177.014387] RIP: 0010:procfile_read+0xb/0x20 [procfs2]
[ 2177.014393] Code: Unable to access opcode bytes at RIP 0xffffffffc1253fe1.
[ 2177.014396] RSP: 0018:ffffbc84412cbe78 EFLAGS: 00010286
[ 2177.014400] RAX: ffffffffc1254000 RBX: 0000000000020000 RCX: ffffbc84412cbef0
[ 2177.014403] RDX: 0000000000020000 RSI: 00007fbbc2a17000 RDI: ffffa057d2708f00
[ 2177.014406] RBP: ffffbc84412cbe80 R08: 0000000000000001 R09: 0000000000000000
[ 2177.014409] R10: 0000000000000000 R11: 0000000000000000 R12: ffffa0581de8ccc0
[ 2177.014411] R13: ffffa057d2708f00 R14: ffffbc84412cbef0 R15: 00007fbbc2a17000
[ 2177.014415] FS:  00007fbbc3bfa580(0000) GS:ffffa0582dbc0000(0000) knlGS:0000000000000000
[ 2177.014418] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 2177.014421] CR2: ffffffffc1253fe1 CR3: 00000003c611c004 CR4: 00000000003606e0
[ 2177.014424] Call Trace:
[ 2177.014435]  proc_reg_read+0x66/0x90
[ 2177.014441]  vfs_read+0xaa/0x190
[ 2177.014446]  ksys_read+0x67/0xe0
[ 2177.014451]  __x64_sys_read+0x1a/0x20
[ 2177.014458]  do_syscall_64+0x49/0xc0
[ 2177.014464]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 2177.014467] RIP: 0033:0x7fbbc3b18142
[ 2177.014472] Code: c0 e9 c2 fe ff ff 50 48 8d 3d 3a ca 0a 00 e8 f5 19 02 00 0f 1f 44 00 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 0f 05 <48> 3d 00 f0 ff ff 77 56 c3 0f 1f 44 00 00 48 83 ec 28 48 89 54 24
[ 2177.014476] RSP: 002b:00007ffcf2d20d78 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
[ 2177.014479] RAX: ffffffffffffffda RBX: 0000000000020000 RCX: 00007fbbc3b18142
[ 2177.014482] RDX: 0000000000020000 RSI: 00007fbbc2a17000 RDI: 0000000000000003
[ 2177.014485] RBP: 00007fbbc2a17000 R08: 00007fbbc2a16010 R09: 0000000000000000
[ 2177.014487] R10: 0000000000000022 R11: 0000000000000246 R12: 0000560f8ff081f0
[ 2177.014490] R13: 0000000000000003 R14: 0000000000020000 R15: 0000000000020000

[ 2177.014635] CR2: 00007fbbc2a17000
[ 2177.014639] ---[ end trace b71ff05c1b0a10f6 ]---
[ 2177.184174] RIP: 0010:procfile_read+0xb/0x20 [procfs2]
[ 2177.184176] Code: Unable to access opcode bytes at RIP 0xffffffffc1253fe1.
[ 2177.184177] RSP: 0018:ffffbc84412cbe78 EFLAGS: 00010286
[ 2177.184178] RAX: ffffffffc1254000 RBX: 0000000000020000 RCX: ffffbc84412cbef0
[ 2177.184179] RDX: 0000000000020000 RSI: 00007fbbc2a17000 RDI: ffffa057d2708f00
[ 2177.184180] RBP: ffffbc84412cbe80 R08: 0000000000000001 R09: 0000000000000000
[ 2177.184180] R10: 0000000000000000 R11: 0000000000000000 R12: ffffa0581de8ccc0
[ 2177.184181] R13: ffffa057d2708f00 R14: ffffbc84412cbef0 R15: 00007fbbc2a17000
[ 2177.184182] FS:  00007fbbc3bfa580(0000) GS:ffffa0582dbc0000(0000) knlGS:0000000000000000
[ 2177.184182] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 2177.184183] CR2: ffffffffc1253fe1 CR3: 00000003c611c004 CR4: 00000000003606e0
 2021-07-29 16:10:52 +08:00
Jim Huang
a82cf74c15 Open Software License is not popular. Explicitly refer to OSI 2021-07-27 10:10:16 +08:00
2011eric
d0f604fc26
Use unified command prompt (#11) 
This patch enforces the assumption of using as a non-root user. That is,
it is necessary to specify sudo for the essential commands such as
insmod and rmmod. In addition, most command prompts should start with
$ (dollar sign).
 2021-07-26 13:10:34 +08:00
Jim Huang
cb5ae95673
Merge pull request #12 from 25077667/style-tweaks 
Fix trivial tweak for missing comma
 2021-07-26 03:18:06 +08:00
25077667
00f7e7018f Fix trivial tweak for missing comma 2021-07-26 03:08:27 +08:00
Jim Huang
65a8c123e4 Tidy section: hello world 2021-07-26 01:46:26 +08:00
Wei-Lun Tsai
ddcbb69fa3
Trivial fix for writing style 2021-07-24 09:14:46 +08:00
Jim Huang
1e3c1b8a76 Apply trivial tweak 2021-07-23 14:36:26 +08:00
Jim Huang
40ae17c1f8
Merge pull request #2 from 25077667/master 
Redraw figure: seq_file
 2021-07-23 14:33:30 +08:00
Jim Huang
78ca9884de
Merge pull request #3 from ekangmonyet/minor-fixes 
Typo at 0.7.3 Manage /proc file with seq_file
 2021-07-23 14:31:18 +08:00
Jim Huang
75356dbe43 Tidy section: hello world 2021-07-23 14:30:09 +08:00
Jim Huang
9b05bf44dd Tweak wording 2021-07-23 14:05:52 +08:00
Jim Huang
58e55d03d0 Tidy section: headers 2021-07-23 14:02:27 +08:00
Jim Huang
f7f46f145d Tidy section: introduction 2021-07-23 13:56:51 +08:00
Ekang Monyet
121d816282 Typo at 0.7.3 Manage /proc file with seq_file 2021-07-23 11:07:17 +08:00
25077667
245ac0298e Use TikZ to re-draw seq_file graph 2021-07-23 02:10:57 +08:00
Jim Huang
35ac926de5 Remove unused packages 2021-07-22 20:47:48 +08:00