swiotlb: do not try to allocate a TLB bigger than MAX_ORDER pages

When allocating a new pool at runtime, reduce the number of slabs so
that the allocation order is at most MAX_ORDER.  This avoids a kernel
warning in __alloc_pages().

The warning is relatively benign, because the pool size is subsequently
reduced when allocation fails, but it is silly to start with a request
that is known to fail, especially since this is the default behavior if
the kernel is built with CONFIG_SWIOTLB_DYNAMIC=y and booted without any
swiotlb= parameter.

Reported-by: Ben Greear <[email protected]>
Closes: https://lore.kernel.org/netdev/[email protected]/
Fixes: 1aaa736815eb ("swiotlb: allocate a new memory pool when existing pools are full")
Signed-off-by: Petr Tesarik <[email protected]>
Signed-off-by: Christoph Hellwig <[email protected]>

0 files changed, 0 insertions, 0 deletions