On 2018-10-24 6:43 p.m., Andrew Morton wrote:
I grabbed it, and added cc:stable.
But aren't we fixing this in the wrong place? That's a valid
expression and if this isn't addressed in perf then we may hit a
similar issue elsewhere...
Right.
Based on:
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
01aa9d518eae8a4d75cd3049defc6ed0b6d0a658
In perf, the warning
[fs_dax:dax_pmd_insert_mapping] unknown op '~'
comes from tools/lib/traceevent/event-parse.c at line 2045:
do_warning_event(event, "unknown op '%s'", token);
This is in this function:
static enum tep_event_type
process_op(struct tep_event_format *event, struct tep_print_arg *arg, char
**tok);
The code path to reach the good '~' case needs:
if (arg->type == TEP_PRINT_OP && !arg->op.left) {
I assume that here arg->op.left is not NULL because of (u64) on the left.
~(((u64) ~(~(((1UL) << 12)-1)))
^
However, I fail to see where '~' is parsed as a binary operator though.
Any pointer would be welcome.
