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lib/test_hmm.c: remove unused dmirror_zero_page
The variable dmirror_zero_page is unused in the HMM self test driver which was probably intended to demonstrate how a driver could use migrate_vma_setup() to share a single read-only device private zero page similar to how the CPU does. However, this isn't needed for the self tests so remove it. Signed-off-by: Ralph Campbell <rcampbell@nvidia.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Cc: Jerome Glisse <jglisse@redhat.com> Link: https://lkml.kernel.org/r/20200914213801.16520-1-rcampbell@nvidia.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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1 changed files with 0 additions and 14 deletions
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@ -36,7 +36,6 @@
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static const struct dev_pagemap_ops dmirror_devmem_ops;
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static const struct dev_pagemap_ops dmirror_devmem_ops;
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static const struct mmu_interval_notifier_ops dmirror_min_ops;
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static const struct mmu_interval_notifier_ops dmirror_min_ops;
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static dev_t dmirror_dev;
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static dev_t dmirror_dev;
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static struct page *dmirror_zero_page;
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struct dmirror_device;
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struct dmirror_device;
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@ -1127,17 +1126,6 @@ static int __init hmm_dmirror_init(void)
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goto err_chrdev;
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goto err_chrdev;
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}
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}
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/*
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* Allocate a zero page to simulate a reserved page of device private
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* memory which is always zero. The zero_pfn page isn't used just to
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* make the code here simpler (i.e., we need a struct page for it).
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*/
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dmirror_zero_page = alloc_page(GFP_HIGHUSER | __GFP_ZERO);
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if (!dmirror_zero_page) {
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ret = -ENOMEM;
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goto err_chrdev;
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}
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pr_info("HMM test module loaded. This is only for testing HMM.\n");
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pr_info("HMM test module loaded. This is only for testing HMM.\n");
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return 0;
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return 0;
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@ -1153,8 +1141,6 @@ static void __exit hmm_dmirror_exit(void)
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{
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{
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int id;
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int id;
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if (dmirror_zero_page)
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__free_page(dmirror_zero_page);
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for (id = 0; id < DMIRROR_NDEVICES; id++)
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for (id = 0; id < DMIRROR_NDEVICES; id++)
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dmirror_device_remove(dmirror_devices + id);
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dmirror_device_remove(dmirror_devices + id);
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unregister_chrdev_region(dmirror_dev, DMIRROR_NDEVICES);
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unregister_chrdev_region(dmirror_dev, DMIRROR_NDEVICES);
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