glibc/glibc-RHEL-1017-2.patch

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From f2a15dd668913c5a1388ba7e1131b25162b2ea75 Mon Sep 17 00:00:00 2001
From: Anton Blanchard <anton@ozlabs.org>
Date: Tue, 27 Jul 2021 15:47:50 +1000
Subject: powerpc64: Check cacheline size before using optimised memset
routines
A number of optimised memset routines assume the cacheline size is 128B,
so we better check before using them.
Reviewed-by: Tulio Magno Quites Machado Filho <tuliom@linux.ibm.com>
diff --git a/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c b/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c
index 32564c8f1f..a3fdcd43bd 100644
--- a/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c
+++ b/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c
@@ -35,6 +35,9 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
unsigned long int hwcap = GLRO(dl_hwcap);
unsigned long int hwcap2 = GLRO(dl_hwcap2);
+#ifdef SHARED
+ int cacheline_size = GLRO(dl_cache_line_size);
+#endif
/* hwcap contains only the latest supported ISA, the code checks which is
and fills the previous supported ones. */
@@ -90,16 +93,21 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
IFUNC_IMPL_ADD (array, i, memset,
hwcap2 & PPC_FEATURE2_ARCH_3_1
&& hwcap2 & PPC_FEATURE2_HAS_ISEL
- && hwcap & PPC_FEATURE_HAS_VSX,
+ && hwcap & PPC_FEATURE_HAS_VSX
+ && cacheline_size == 128,
__memset_power10)
#endif
- IFUNC_IMPL_ADD (array, i, memset, hwcap2 & PPC_FEATURE2_ARCH_2_07,
+ IFUNC_IMPL_ADD (array, i, memset, hwcap2 & PPC_FEATURE2_ARCH_2_07
+ && cacheline_size == 128,
__memset_power8)
- IFUNC_IMPL_ADD (array, i, memset, hwcap & PPC_FEATURE_ARCH_2_06,
+ IFUNC_IMPL_ADD (array, i, memset, hwcap & PPC_FEATURE_ARCH_2_06
+ && cacheline_size == 128,
__memset_power7)
- IFUNC_IMPL_ADD (array, i, memset, hwcap & PPC_FEATURE_ARCH_2_05,
+ IFUNC_IMPL_ADD (array, i, memset, hwcap & PPC_FEATURE_ARCH_2_05
+ && cacheline_size == 128,
__memset_power6)
- IFUNC_IMPL_ADD (array, i, memset, hwcap & PPC_FEATURE_POWER4,
+ IFUNC_IMPL_ADD (array, i, memset, hwcap & PPC_FEATURE_POWER4
+ && cacheline_size == 128,
__memset_power4)
IFUNC_IMPL_ADD (array, i, memset, 1, __memset_ppc))
diff --git a/sysdeps/powerpc/powerpc64/multiarch/memset.c b/sysdeps/powerpc/powerpc64/multiarch/memset.c
index c1aa143f60..056e911699 100644
--- a/sysdeps/powerpc/powerpc64/multiarch/memset.c
+++ b/sysdeps/powerpc/powerpc64/multiarch/memset.c
@@ -43,16 +43,21 @@ libc_ifunc (__libc_memset,
# ifdef __LITTLE_ENDIAN__
(hwcap2 & PPC_FEATURE2_ARCH_3_1
&& hwcap2 & PPC_FEATURE2_HAS_ISEL
- && hwcap & PPC_FEATURE_HAS_VSX)
+ && hwcap & PPC_FEATURE_HAS_VSX
+ && GLRO(dl_cache_line_size) == 128)
? __memset_power10 :
# endif
- (hwcap2 & PPC_FEATURE2_ARCH_2_07)
+ (hwcap2 & PPC_FEATURE2_ARCH_2_07
+ && GLRO(dl_cache_line_size) == 128)
? __memset_power8 :
- (hwcap & PPC_FEATURE_ARCH_2_06)
+ (hwcap & PPC_FEATURE_ARCH_2_06
+ && GLRO(dl_cache_line_size) == 128)
? __memset_power7 :
- (hwcap & PPC_FEATURE_ARCH_2_05)
+ (hwcap & PPC_FEATURE_ARCH_2_05
+ && GLRO(dl_cache_line_size) == 128)
? __memset_power6 :
- (hwcap & PPC_FEATURE_POWER4)
+ (hwcap & PPC_FEATURE_POWER4
+ && GLRO(dl_cache_line_size) == 128)
? __memset_power4
: __memset_ppc);