Re: [PATCH] iommu/arm-smmu-v3: Stop pre-zeroing batch commands
From: Will Deacon <will@kernel.org>
Date: 2021-08-13 14:33:57
Also in:
linux-iommu, lkml
On Wed, 11 Aug 2021 23:49:26 +0800, John Garry wrote:
Pre-zeroing the batched commands structure is inefficient, as individual
commands are zeroed later in arm_smmu_cmdq_build_cmd(). The size is quite
large and commonly most commands won't even be used:
struct arm_smmu_cmdq_batch cmds = {};
345c: 52800001 mov w1, #0x0 // #0
3460: d2808102 mov x2, #0x408 // #1032
3464: 910143a0 add x0, x29, #0x50
3468: 94000000 bl 0 <memset>
[...]
Applied to will (for-joerg/arm-smmu/updates), thanks!
[1/1] iommu/arm-smmu-v3: Stop pre-zeroing batch commands
https://git.kernel.org/will/c/fac956710ab0
Cheers,
--
Will
https://fixes.arm64.dev
https://next.arm64.dev
https://will.arm64.dev
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