5.15-stable review patch. If anyone has any objections, please let me know.
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From: Jann Horn jannh@google.com
[ Upstream commit 28148a17c988b614534f457da86893f83664ad43 ]
Since commit 8782fb61cc848 ("mm: pagewalk: Fix race between unmap and page walker"), walk_page_range() on kernel ranges won't work anymore, walk_page_range_novma() must be used instead.
Note: I don't have an openrisc development setup, so this is completely untested.
Fixes: 8782fb61cc848 ("mm: pagewalk: Fix race between unmap and page walker") Signed-off-by: Jann Horn jannh@google.com Signed-off-by: Stafford Horne shorne@gmail.com Signed-off-by: Sasha Levin sashal@kernel.org --- arch/openrisc/kernel/dma.c | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-)
diff --git a/arch/openrisc/kernel/dma.c b/arch/openrisc/kernel/dma.c index a82b2caaa560d..b3edbb33b621d 100644 --- a/arch/openrisc/kernel/dma.c +++ b/arch/openrisc/kernel/dma.c @@ -74,10 +74,10 @@ void *arch_dma_set_uncached(void *cpu_addr, size_t size) * We need to iterate through the pages, clearing the dcache for * them and setting the cache-inhibit bit. */ - mmap_read_lock(&init_mm); - error = walk_page_range(&init_mm, va, va + size, &set_nocache_walk_ops, - NULL); - mmap_read_unlock(&init_mm); + mmap_write_lock(&init_mm); + error = walk_page_range_novma(&init_mm, va, va + size, + &set_nocache_walk_ops, NULL, NULL); + mmap_write_unlock(&init_mm);
if (error) return ERR_PTR(error); @@ -88,11 +88,11 @@ void arch_dma_clear_uncached(void *cpu_addr, size_t size) { unsigned long va = (unsigned long)cpu_addr;
- mmap_read_lock(&init_mm); + mmap_write_lock(&init_mm); /* walk_page_range shouldn't be able to fail here */ - WARN_ON(walk_page_range(&init_mm, va, va + size, - &clear_nocache_walk_ops, NULL)); - mmap_read_unlock(&init_mm); + WARN_ON(walk_page_range_novma(&init_mm, va, va + size, + &clear_nocache_walk_ops, NULL, NULL)); + mmap_write_unlock(&init_mm); }
void arch_sync_dma_for_device(phys_addr_t addr, size_t size,