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Subject[PATCH v1 8/8] powerpc/mem: Use kmap_local_page() in flushing functions
Date
Flushing functions don't rely on preemption being disabled, so
use kmap_local_page() instead of kmap_atomic().

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
---
arch/powerpc/mm/mem.c | 19 ++++++++++---------
1 file changed, 10 insertions(+), 9 deletions(-)

diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
index 65b2205839fe..1895bd64191a 100644
--- a/arch/powerpc/mm/mem.c
+++ b/arch/powerpc/mm/mem.c
@@ -464,16 +464,16 @@ static void flush_dcache_icache_hugepage(struct page *page)
{
int i;
int nr = compound_nr(page);
- void *start;

if (!PageHighMem(page)) {
for (i = 0; i < nr; i++)
__flush_dcache_icache(lowmem_page_address(page + i));
} else {
for (i = 0; i < nr; i++) {
- start = kmap_atomic(page+i);
+ void *start = kmap_local_page(page + i);
+
__flush_dcache_icache(start);
- kunmap_atomic(start);
+ kunmap_local(start);
}
}
}
@@ -489,9 +489,10 @@ void flush_dcache_icache_page(struct page *page)
if (!PageHighMem(page)) {
__flush_dcache_icache(lowmem_page_address(page));
} else if (IS_ENABLED(CONFIG_BOOKE) || sizeof(phys_addr_t) > sizeof(void *)) {
- void *start = kmap_atomic(page);
+ void *start = kmap_local_page(page);
+
__flush_dcache_icache(start);
- kunmap_atomic(start);
+ kunmap_local(start);
} else {
flush_dcache_icache_phys(page_to_phys(page));
}
@@ -564,11 +565,11 @@ void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
void flush_icache_user_page(struct vm_area_struct *vma, struct page *page,
unsigned long addr, int len)
{
- unsigned long maddr;
+ void *maddr;

- maddr = (unsigned long) kmap(page) + (addr & ~PAGE_MASK);
- flush_icache_range(maddr, maddr + len);
- kunmap(page);
+ maddr = kmap_local_page(page) + (addr & ~PAGE_MASK);
+ flush_icache_range((unsigned long)maddr, (unsigned long)maddr + len);
+ kunmap_local(maddr);
}

/*
--
2.25.0
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