From: Christophe Leroy <christophe.leroy@c-s.fr>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>,
Michael Ellerman <mpe@ellerman.id.au>,
Nicholas Piggin <npiggin@gmail.com>,
Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>,
Andrey Ryabinin <aryabinin@virtuozzo.com>,
Alexander Potapenko <glider@google.com>,
Dmitry Vyukov <dvyukov@google.com>,
Daniel Axtens <dja@axtens.net>
Cc: linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
kasan-dev@googlegroups.com, linux-mm@kvack.org
Subject: [PATCH v11 06/13] powerpc/32: use memset() instead of memset_io() to zero BSS
Date: Fri, 26 Apr 2019 16:23:30 +0000 (UTC) [thread overview]
Message-ID: <f8cf3904971fa6b0f90ff9f2c2c1551b0cab4f14.1556295460.git.christophe.leroy@c-s.fr> (raw)
In-Reply-To: <cover.1556295459.git.christophe.leroy@c-s.fr>
Since commit 400c47d81ca38 ("powerpc32: memset: only use dcbz once cache is
enabled"), memset() can be used before activation of the cache,
so no need to use memset_io() for zeroing the BSS.
Acked-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
---
arch/powerpc/kernel/early_32.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/powerpc/kernel/early_32.c b/arch/powerpc/kernel/early_32.c
index cf3cdd81dc47..3482118ffe76 100644
--- a/arch/powerpc/kernel/early_32.c
+++ b/arch/powerpc/kernel/early_32.c
@@ -21,8 +21,8 @@ notrace unsigned long __init early_init(unsigned long dt_ptr)
{
unsigned long offset = reloc_offset();
- /* First zero the BSS -- use memset_io, some platforms don't have caches on yet */
- memset_io((void __iomem *)PTRRELOC(&__bss_start), 0, __bss_stop - __bss_start);
+ /* First zero the BSS */
+ memset(PTRRELOC(&__bss_start), 0, __bss_stop - __bss_start);
/*
* Identify the CPU type and fix up code sections
--
2.13.3
next prev parent reply other threads:[~2019-04-26 16:23 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-26 16:23 [PATCH v11 00/13] KASAN for powerpc/32 Christophe Leroy
2019-04-26 16:23 ` [PATCH v11 01/13] powerpc/32: Move early_init() in a separate file Christophe Leroy
2019-05-03 6:59 ` Michael Ellerman
2019-04-26 16:23 ` [PATCH v11 02/13] powerpc: prepare string/mem functions for KASAN Christophe Leroy
2019-04-26 16:23 ` [PATCH v11 03/13] powerpc: remove CONFIG_CMDLINE #ifdef mess Christophe Leroy
2019-04-26 16:23 ` [PATCH v11 04/13] powerpc/prom_init: don't use string functions from lib/ Christophe Leroy
2019-04-26 16:23 ` [PATCH v11 05/13] powerpc: don't use direct assignation during early boot Christophe Leroy
2019-04-26 16:23 ` Christophe Leroy [this message]
2019-04-26 16:23 ` [PATCH v11 07/13] powerpc/32: make KVIRT_TOP dependent on FIXMAP_START Christophe Leroy
2019-04-26 16:23 ` [PATCH v11 08/13] powerpc/32: prepare shadow area for KASAN Christophe Leroy
2019-04-26 16:23 ` [PATCH v11 09/13] powerpc: disable KASAN instrumentation on early/critical files Christophe Leroy
2019-05-03 7:38 ` Christophe Leroy
2019-04-26 16:23 ` [PATCH v11 10/13] powerpc/32: Add KASAN support Christophe Leroy
2019-05-03 6:51 ` Christophe Leroy
2019-04-26 16:23 ` [PATCH v11 11/13] powerpc/32s: move hash code patching out of MMU_init_hw() Christophe Leroy
2019-04-26 16:23 ` [PATCH v11 12/13] powerpc/32s: set up an early static hash table for KASAN Christophe Leroy
2019-04-26 16:23 ` [PATCH v11 13/13] powerpc/32s: map kasan zero shadow with PAGE_READONLY instead of PAGE_KERNEL_RO Christophe Leroy
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