[llvm] [lit] Honor --max-time as an absolute deadline (PR #202324)

[via llvm-commits]

https://github.com/prasoon054 created https://github.com/llvm/llvm-project/pull/202324

Currently, `Run._wait_for` snapshots the time budget once and reuses it for every `AsyncResults.get()`, so only the first `wait` honors the deadline. `--max-time` then stops capping total testing time, a run can exceed it.

With this change, `deadline-time.time()` is recomputed on each wait.

>From 7b8472944a36401214337c8e9d891f426aedd2b4 Mon Sep 17 00:00:00 2001
From: Prasoon Kumar <prasoonkumar054 at gmail.com>
Date: Mon, 8 Jun 2026 15:53:32 +0530
Subject: [PATCH] [lit] Honor --max-time as an absolute deadline

Currently, Run._wait_for snapshots the time budget once and reuses it for every AsyncResults.get(), so only the first wait honors the deadline. --max-time then stops capping total testing time, a run can exceed it.

With this change, deadline-time.time() is recomputed on each wait.

Signed-off-by: Prasoon Kumar <prasoonkumar054 at gmail.com>
---
 llvm/utils/lit/lit/run.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/llvm/utils/lit/lit/run.py b/llvm/utils/lit/lit/run.py
index 6c6d464a6881a..acab69365ebe0 100644
--- a/llvm/utils/lit/lit/run.py
+++ b/llvm/utils/lit/lit/run.py
@@ -16,6 +16,7 @@
 def _ceilDiv(a, b):
     return (a + b - 1) // b
 
+
 class MaxFailuresError(Exception):
     pass
 
@@ -141,12 +142,11 @@ def _execute(self, deadline):
                 pool.join()
 
     def _wait_for(self, async_results, deadline):
-        timeout = deadline - time.time()
         idx = 0
         while len(async_results) > 0:
             try:
                 ar = async_results.pop(0)
-                test = ar.get(timeout)
+                test = ar.get(deadline - time.time())
             except multiprocessing.TimeoutError:
                 raise TimeoutError()
             else: