glibc/SOURCES/glibc-rh2180462-4.patch

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2023-11-14 19:00:37 +00:00
Adjusted for backport to c8s by modifying sysdeps/x86/cacheinfo.h.
commit 885a7f0feee951f514a121788f46f33b2867110f
Author: Noah Goldstein <goldstein.w.n@gmail.com>
Date: Fri Aug 11 12:29:11 2023 -0500
x86: Fix incorrect scope of setting `shared_per_thread` [BZ# 30745]
The:
```
if (shared_per_thread > 0 && threads > 0)
shared_per_thread /= threads;
```
Code was accidentally moved to inside the else scope. This doesn't
match how it was previously (before af992e7abd).
This patch fixes that by putting the division after the `else` block.
diff --git a/sysdeps/x86/cacheinfo.h b/sysdeps/x86/cacheinfo.h
index 4dbfa979ef052eaa..e53fa25106c95253 100644
--- a/sysdeps/x86/cacheinfo.h
+++ b/sysdeps/x86/cacheinfo.h
@@ -243,11 +243,10 @@ get_common_cache_info (long int *shared_ptr, long int * shared_per_thread_ptr, u
level. */
threads = ((cpu_features->features[COMMON_CPUID_INDEX_1].cpuid.ebx >> 16)
& 0xff);
-
- /* Get per-thread size of highest level cache. */
- if (shared_per_thread > 0 && threads > 0)
- shared_per_thread /= threads;
}
+ /* Get per-thread size of highest level cache. */
+ if (shared_per_thread > 0 && threads > 0)
+ shared_per_thread /= threads;
}
/* Account for non-inclusive L2 and L3 caches. */