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powerpc/mem: Use kmap_local_page() in flushing functions

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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>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/b6a880ea0ec7886b51edbb4979c188be549231c0.1617895813.git.christophe.leroy@csgroup.eu
This commit is contained in:
Christophe Leroy 2021-04-08 15:30:33 +00:00 committed by Michael Ellerman
parent 6c96020882
commit 7e9ab144c1
1 changed files with 10 additions and 9 deletions
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19
arch/powerpc/mm/cacheflush.c
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@ -152,16 +152,16 @@ 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);
}
}
}
@ -177,9 +177,10 @@ 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));
}
@ -225,9 +226,9 @@ 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);
}