From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: linuxppc-dev@lists.ozlabs.org
Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Subject: [PATCH] powerpc/mm: Fix lazy icache flush on pre-POWER5
Date: Tue, 29 Nov 2016 13:13:46 +1100 [thread overview]
Message-ID: <1480385626.11342.53.camel@kernel.crashing.org> (raw)
On 64-bit CPUs with no-execute support and non-snooping icache, such as
970 or POWER4, we have a software mechanism to ensure coherency of the
cache (using exec faults when needed).
This was broken due to a logic inversion when that code was rewritten
from assembly to C.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Fixes: 91f1da99792a1d133df94c4753510305353064a1
Fixes: 89ff725051d177556b23d80f2a30f880a657a6c1
Fixes: a43c0eb8364c022725df586e91dd753633374d66
--
diff --git a/arch/powerpc/mm/hash64_4k.c b/arch/powerpc/mm/hash64_4k.c
index 42c702b..6fa450c 100644
--- a/arch/powerpc/mm/hash64_4k.c
+++ b/arch/powerpc/mm/hash64_4k.c
@@ -55,7 +55,7 @@ int __hash_page_4K(unsigned long ea, unsigned long access, unsigned long vsid,
*/
rflags = htab_convert_pte_flags(new_pte);
- if (!cpu_has_feature(CPU_FTR_NOEXECUTE) &&
+ if (cpu_has_feature(CPU_FTR_NOEXECUTE) &&
!cpu_has_feature(CPU_FTR_COHERENT_ICACHE))
rflags = hash_page_do_lazy_icache(rflags, __pte(old_pte), trap);
diff --git a/arch/powerpc/mm/hash64_64k.c b/arch/powerpc/mm/hash64_64k.c
index 3bbbea0..1a68cb1 100644
--- a/arch/powerpc/mm/hash64_64k.c
+++ b/arch/powerpc/mm/hash64_64k.c
@@ -87,7 +87,7 @@ int __hash_page_4K(unsigned long ea, unsigned long access, unsigned long vsid,
subpg_pte = new_pte & ~subpg_prot;
rflags = htab_convert_pte_flags(subpg_pte);
- if (!cpu_has_feature(CPU_FTR_NOEXECUTE) &&
+ if (cpu_has_feature(CPU_FTR_NOEXECUTE) &&
!cpu_has_feature(CPU_FTR_COHERENT_ICACHE)) {
/*
@@ -258,7 +258,7 @@ int __hash_page_64K(unsigned long ea, unsigned long access,
rflags = htab_convert_pte_flags(new_pte);
- if (!cpu_has_feature(CPU_FTR_NOEXECUTE) &&
+ if (cpu_has_feature(CPU_FTR_NOEXECUTE) &&
!cpu_has_feature(CPU_FTR_COHERENT_ICACHE))
rflags = hash_page_do_lazy_icache(rflags, __pte(old_pte), trap);
next reply other threads:[~2016-11-29 2:13 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-29 2:13 Benjamin Herrenschmidt [this message]
2016-11-29 2:55 ` [PATCH] powerpc/mm: Fix lazy icache flush on pre-POWER5 Aneesh Kumar K.V
2016-11-30 12:27 ` Michael Ellerman
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