Re: [PATCH v5 2/6] dma: swiotlb: Track whether the pool size was explicitly set
From: Catalin Marinas <catalin.marinas@arm.com>
Date: 2026-09-21 12:50:28
Also in:
linux-iommu, linux-mips, linux-riscv, linux-s390, linuxppc-dev, lkml, loongarch
On Mon, Sep 21, 2026 at 12:06:24PM +0530, Aneesh Kumar K.V (Arm) wrote:
swiotlb_adjust_size() must not override a pool size supplied through the swiotlb= command-line parameter. Currently, it determines whether a size was supplied by comparing default_nslabs with IO_TLB_DEFAULT_SIZE. This fails when the user explicitly requests the compiled-in default size, allowing the request to be overwritten by automatic pool sizing. Record whether swiotlb= supplied a numeric size and add swiotlb_default_size_changed() to query that state. Signed-off-by: Aneesh Kumar K.V (Arm) <aneesh.kumar@kernel.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>