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SubjectRe: [PATCH] powerpc/mm: Don't kmap_atomic() in pte_offset_map() on PPC32
On Mon, 2020-02-17 at 09:41:35 UTC, Christophe Leroy wrote:
> On PPC32, pte_offset_map() does a kmap_atomic() in order to support
> page tables allocated in high memory, just like ARM and x86/32.
> But since at least 2008 and commit 8054a3428fbe ("powerpc: Remove dead
> CONFIG_HIGHPTE"), page tables are never allocated in high memory.
> When the page is in low mem, kmap_atomic() just returns the page
> address but still disable preemption and pagefault. And it is
> not an inlined function, so we suffer function call for no reason.
> Make pte_offset_map() the same as pte_offset_kernel() and make
> pte_unmap() void, in the same way as PPC64 which doesn't have HIGHMEM.
> Signed-off-by: Christophe Leroy <>

Applied to powerpc next, thanks.


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