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795c58e4c7
It was reported that the ioctl() number used to update the ring buffer
memory mapping conflicted with the TCGETS ioctl causing strace to report:
$ strace -e ioctl stty
ioctl(0, TCGETS or TRACE_MMAP_IOCTL_GET_READER, {c_iflag=ICRNL|IXON, c_oflag=NL0|CR0|TAB0|BS0|VT0|FF0|OPOST|ONLCR, c_cflag=B38400|CS8|CREAD, c_lflag=ISIG|ICANON|ECHO|ECHOE|ECHOK|IEXTEN|ECHOCTL|ECHOKE, ...}) = 0
Since this ioctl hasn't been in a full release yet, change it from "T", 0x1
to "R" 0x20, and also reserve 0x20-0x2F for future ioctl commands, as
some more are being worked on for the future.
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Merge tag 'trace-v6.10-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace
Pull tracing fix from Steven Rostedt:
"Fix ioctl conflict with memmapped ring buffer ioctl
It was reported that the ioctl() number used to update the ring buffer
memory mapping conflicted with the TCGETS ioctl causing strace to
report:
$ strace -e ioctl stty
ioctl(0, TCGETS or TRACE_MMAP_IOCTL_GET_READER, {c_iflag=ICRNL|IXON, c_oflag=NL0|CR0|TAB0|BS0|VT0|FF0|OPOST|ONLCR, c_cflag=B38400|CS8|CREAD, c_lflag=ISIG|ICANON|ECHO|ECHOE|ECHOK|IEXTEN|ECHOCTL|ECHOKE, ...}) = 0
Since this ioctl hasn't been in a full release yet, change it from
"T", 0x1 to "R" 0x20, and also reserve 0x20-0x2F for future ioctl
commands, as some more are being worked on for the future"
* tag 'trace-v6.10-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
tracing: Have memmapped ring buffer use ioctl of "R" range 0x20-2F
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.