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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2024-07-03 14:54:35 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2024-07-03 14:54:35 -0700 |
| commit | 795c58e4c7fc6163d8fb9f2baa86cfe898fa4b19 (patch) | |
| tree | 16dbd907ef43f7611b3a7b14f10621c3ca7f7b5f /include | |
| parent | 8a9c6c40432e265600232b864f97d7c675e8be52 (diff) | |
| parent | 4ecaf7e98a3ae0c843d67c76649ecc694232834b (diff) | |
| download | lwn-795c58e4c7fc6163d8fb9f2baa86cfe898fa4b19.tar.gz lwn-795c58e4c7fc6163d8fb9f2baa86cfe898fa4b19.zip | |
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
Diffstat (limited to 'include')
| -rw-r--r-- | include/uapi/linux/trace_mmap.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/uapi/linux/trace_mmap.h b/include/uapi/linux/trace_mmap.h index bd1066754220..c102ef35d11e 100644 --- a/include/uapi/linux/trace_mmap.h +++ b/include/uapi/linux/trace_mmap.h @@ -43,6 +43,6 @@ struct trace_buffer_meta { __u64 Reserved2; }; -#define TRACE_MMAP_IOCTL_GET_READER _IO('T', 0x1) +#define TRACE_MMAP_IOCTL_GET_READER _IO('R', 0x20) #endif /* _TRACE_MMAP_H_ */ |