The patch below does not apply to the 5.15-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 097f1eefedeab528cecbd35586dfe293853ffb17 Mon Sep 17 00:00:00 2001 From: Tom Zanussi zanussi@kernel.org Date: Thu, 27 Jan 2022 15:44:17 -0600 Subject: [PATCH] tracing: Propagate is_signed to expression

During expression parsing, a new expression field is created which should inherit the properties of the operands, such as size and is_signed.

is_signed propagation was missing, causing spurious errors with signed operands. Add it in parse_expr() and parse_unary() to fix the problem.

Link: https://lkml.kernel.org/r/f4dac08742fd7a0920bf80a73c6c44042f5eaa40.164331970...

Cc: stable@vger.kernel.org Fixes: 100719dcef447 ("tracing: Add simple expression support to hist triggers") Reported-by: Yordan Karadzhov ykaradzhov@vmware.com BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=215513 Signed-off-by: Tom Zanussi zanussi@kernel.org Signed-off-by: Steven Rostedt (Google) rostedt@goodmis.org

diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c index b894d68082ea..ada87bfb5bb8 100644 --- a/kernel/trace/trace_events_hist.c +++ b/kernel/trace/trace_events_hist.c @@ -2503,6 +2503,8 @@ static struct hist_field *parse_unary(struct hist_trigger_data *hist_data, (HIST_FIELD_FL_TIMESTAMP | HIST_FIELD_FL_TIMESTAMP_USECS); expr->fn = hist_field_unary_minus; expr->operands[0] = operand1; + expr->size = operand1->size; + expr->is_signed = operand1->is_signed; expr->operator = FIELD_OP_UNARY_MINUS; expr->name = expr_str(expr, 0); expr->type = kstrdup_const(operand1->type, GFP_KERNEL); @@ -2719,6 +2721,7 @@ static struct hist_field *parse_expr(struct hist_trigger_data *hist_data,

/* The operand sizes should be the same, so just pick one */ expr->size = operand1->size; + expr->is_signed = operand1->is_signed;

expr->operator = field_op; expr->type = kstrdup_const(operand1->type, GFP_KERNEL);