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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>
Stop pre-zeroing the complete structure and only zero the num member.
Signed-off-by: John Garry <john.garry@huawei.com>
Link: https://lore.kernel.org/r/1628696966-88386-1-git-send-email-john.garry@huawei.com
Signed-off-by: Will Deacon <will@kernel.org>
fac956710a