Steven Rostedt (VMware) 1c758a2202 tracing/x86: Update syscall trace events to handle new prefixed syscall func names ... Arnaldo noticed that the latest kernel is missing the syscall event system directory in x86. I bisected it down to d5a00528b5 ("syscalls/core, syscalls/x86: Rename struct pt_regs-based sys_*() to __x64_sys_*()"). The system call trace events are special, as there is only one trace event for all system calls (the raw_syscalls). But a macro that wraps the system calls creates meta data for them that copies the name to find the system call that maps to the system call table (the number). At boot up, it does a kallsyms lookup of the system call table to find the function that maps to the meta data of the system call. If it does not find a function, then that system call is ignored. Because the x86 system calls had "__x64_", or "__ia32_" prefixed to the "sys" for the names, they do not match the default compare algorithm. As this was a problem for power pc, the algorithm can be overwritten by the architecture. The solution is to have x86 have its own algorithm to do the compare and this brings back the system call trace events. Link: http://lkml.kernel.org/r/20180417174128.0f3457f0@gandalf.local.home Reported-by: Arnaldo Carvalho de Melo <acme@redhat.com> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Acked-by: Dominik Brodowski <linux@dominikbrodowski.net> Acked-by: Thomas Gleixner <tglx@linutronix.de> Fixes: d5a00528b5 ("syscalls/core, syscalls/x86: Rename struct pt_regs-based sys_*() to __x64_sys_*()") Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>		2018-04-25 10:27:55 -04:00
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asm	tracing/x86: Update syscall trace events to handle new prefixed syscall func names	2018-04-25 10:27:55 -04:00
uapi/asm	Merge branch 'x86-pti-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2018-04-15 13:35:29 -07:00