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tracepoints: Migrate to use SYSCALL_WORK flag

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On architectures using the generic syscall entry code the architecture
independent syscall work is moved to flags in thread_info::syscall_work.
This removes architecture dependencies and frees up TIF bits.

Define SYSCALL_WORK_SYSCALL_TRACEPOINT, use it in the generic entry code
and convert the code which uses the TIF specific helper functions to use
the new *_syscall_work() helpers which either resolve to the new mode for
users of the generic entry code or to the TIF based functions for the other
architectures.

Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Andy Lutomirski <luto@kernel.org>
Link: https://lore.kernel.org/r/20201116174206.2639648-6-krisman@collabora.com
This commit is contained in:
Gabriel Krisman Bertazi 2020-11-16 12:42:01 -05:00 • committed by Thomas Gleixner
parent 23d67a5485
commit 524666cb5d
6 changed files with 18 additions and 19 deletions
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8
kernel/trace/trace_events.c
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@ -3428,10 +3428,10 @@ static __init int event_trace_enable(void)
* initialize events and perhaps start any events that are on the
* command line. Unfortunately, there are some events that will not
* start this early, like the system call tracepoints that need
* to set the TIF_SYSCALL_TRACEPOINT flag of pid 1. But event_trace_enable()
* is called before pid 1 starts, and this flag is never set, making
* the syscall tracepoint never get reached, but the event is enabled
* regardless (and not doing anything).
* to set the %SYSCALL_WORK_SYSCALL_TRACEPOINT flag of pid 1. But
* event_trace_enable() is called before pid 1 starts, and this flag
* is never set, making the syscall tracepoint never get reached, but
* the event is enabled regardless (and not doing anything).
*/
static __init int event_trace_enable_again(void)
{