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Subject[RFC PATCH v2 1/3] powerpc/mm: prepare kernel for KAsan on PPC32
Date
In kernel/cputable.c, explicitly use memcpy() in order
to allow GCC to replace it with __memcpy() when KASAN is
selected.

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.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
---
arch/powerpc/kernel/cputable.c | 4 ++--
arch/powerpc/kernel/setup_32.c | 6 ++----
2 files changed, 4 insertions(+), 6 deletions(-)

diff --git a/arch/powerpc/kernel/cputable.c b/arch/powerpc/kernel/cputable.c
index 2da01340c84c..9ea031b05f19 100644
--- a/arch/powerpc/kernel/cputable.c
+++ b/arch/powerpc/kernel/cputable.c
@@ -2145,7 +2145,7 @@ void __init set_cur_cpu_spec(struct cpu_spec *s)
struct cpu_spec *t = &the_cpu_spec;

t = PTRRELOC(t);
- *t = *s;
+ memcpy(t, s, sizeof(*t));

*PTRRELOC(&cur_cpu_spec) = &the_cpu_spec;
}
@@ -2160,7 +2160,7 @@ static struct cpu_spec * __init setup_cpu_spec(unsigned long offset,
old = *t;

/* Copy everything, then do fixups */
- *t = *s;
+ memcpy(t, s, sizeof(*t));

/*
* If we are overriding a previous value derived from the real
diff --git a/arch/powerpc/kernel/setup_32.c b/arch/powerpc/kernel/setup_32.c
index 972c98d1e208..00b8f54fed29 100644
--- a/arch/powerpc/kernel/setup_32.c
+++ b/arch/powerpc/kernel/setup_32.c
@@ -74,10 +74,8 @@ 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
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