[glibc] x86: Fix value for `x86_memset_non_temporal_threshold` when it is undesirable

[glibc] x86: Fix value for `x86_memset_non_temporal_threshold` when it is undesirable

[Noah Goldstein]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=5b54a33435e5533653a9956728f2de9d16a3b4ee

commit 5b54a33435e5533653a9956728f2de9d16a3b4ee
Author: Noah Goldstein <goldstein.w.n@gmail.com>
Date:   Fri Jun 14 13:01:58 2024 -0500

    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>

Diff:
---
 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 d2fe61b997..3a6ec4ef9f 100644
--- a/sysdeps/x86/dl-cacheinfo.h
+++ b/sysdeps/x86/dl-cacheinfo.h
@@ -1044,9 +1044,9 @@ 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,