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FAILED: patch "[PATCH] tracing: Propagate is_signed to expression" failed to apply to 5.4-stable tree

PATCH [email protected] 1 participant 1 message Jan 29, 2022

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The patch below does not apply to the 5.4-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 <[email protected]>.

thanks,

greg k-h

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

From 097f1eefedeab528cecbd35586dfe293853ffb17 Mon Sep 17 00:00:00 2001
From: Tom Zanussi <[email protected]>
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/f4dac08742fd7a0920bf80a73c6c44042f5eaa40.1643319703.git.zanussi@kernel.org open here
Cc [email protected]
Fixes 100719dcef447 ("tracing: Add simple expression support to hist triggers")
Reported-by Yordan Karadzhov <[email protected]>
BugLink https://bugzilla.kernel.org/show_bug.cgi?id=215513
Signed-off-by Tom Zanussi <[email protected]>
Signed-off-by Steven Rostedt (Google) <[email protected]>
kernel/trace/trace_events_hist.c +3 -0
index b894d68082ea..ada87bfb5bb8 100644
@@ -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);