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>
(cherry picked from commit 5b54a33435e5533653a9956728f2de9d16a3b4ee)

diff --git a/sysdeps/x86/dl-cacheinfo.h b/sysdeps/x86/dl-cacheinfo.h
index 9916c5d951361c904f8fde9c74c89481b1b84afd..9b6f68e46de4bdaa83ae067cf7dfd50b0cd9aeed 100644 (file)
--- 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,