From 8a2cea0ae0cbd4120770b81f0be422f60f020e17 Mon Sep 17 00:00:00 2001
From: Noah Goldstein <goldstein.w.n@gmail.com>
Date: Fri, 14 Jun 2024 13:01:58 -0500
Subject: [PATCH 06/10] x86: Fix value for `x86_memset_non_temporal_threshold`
 when it is undesirable

When we don't want to use non-temporal stores for memset, we set
`x86_memset_non_temporal_threshold` to SIZE_MAX.

The current code, however, we using `maximum_non_temporal_threshold`
as the upper bound which is `SIZE_MAX >> 4` so we ended up with a
value of `0`.

Fix is to just use `SIZE_MAX` as the upper bound for when setting the
tunable.
Tested-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
---
 sysdeps/x86/dl-cacheinfo.h | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/sysdeps/x86/dl-cacheinfo.h b/sysdeps/x86/dl-cacheinfo.h
index dfdb4069c7..a76df092e6 100644
--- a/sysdeps/x86/dl-cacheinfo.h
+++ b/sysdeps/x86/dl-cacheinfo.h
@@ -1101,9 +1101,9 @@ dl_init_cacheinfo (struct cpu_features *cpu_features)
   TUNABLE_SET_WITH_BOUNDS (x86_non_temporal_threshold, non_temporal_threshold,
 			   minimum_non_temporal_threshold,
 			   maximum_non_temporal_threshold);
-  TUNABLE_SET_WITH_BOUNDS (
-      x86_memset_non_temporal_threshold, memset_non_temporal_threshold,
-      minimum_non_temporal_threshold, maximum_non_temporal_threshold);
+  TUNABLE_SET_WITH_BOUNDS (x86_memset_non_temporal_threshold,
+			   memset_non_temporal_threshold,
+			   minimum_non_temporal_threshold, SIZE_MAX);
   TUNABLE_SET_WITH_BOUNDS (x86_rep_movsb_threshold, rep_movsb_threshold,
 			   minimum_rep_movsb_threshold, SIZE_MAX);
   TUNABLE_SET_WITH_BOUNDS (x86_rep_stosb_threshold, rep_stosb_threshold, 1,
-- 
2.17.1

