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lib/test_hmm.c: remove unused dmirror_zero_page

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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>
This commit is contained in:
Ralph Campbell 2020-10-13 16:54:32 -07:00 committed by Linus Torvalds
parent bfe18a0900
commit 9b53122f61
1 changed files with 0 additions and 14 deletions
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14
lib/test_hmm.c
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@ -36,7 +36,6 @@
static const struct dev_pagemap_ops dmirror_devmem_ops;
static const struct mmu_interval_notifier_ops dmirror_min_ops;
static dev_t dmirror_dev;
static struct page *dmirror_zero_page;
struct dmirror_device;
@ -1127,17 +1126,6 @@ static int __init hmm_dmirror_init(void)
goto err_chrdev;
}
/*
* Allocate a zero page to simulate a reserved page of device private
* memory which is always zero. The zero_pfn page isn't used just to
* make the code here simpler (i.e., we need a struct page for it).
*/
dmirror_zero_page = alloc_page(GFP_HIGHUSER | __GFP_ZERO);
if (!dmirror_zero_page) {
ret = -ENOMEM;
goto err_chrdev;
}
pr_info("HMM test module loaded. This is only for testing HMM.\n");
return 0;
@ -1153,8 +1141,6 @@ static void __exit hmm_dmirror_exit(void)
{
int id;
if (dmirror_zero_page)
__free_page(dmirror_zero_page);
for (id = 0; id < DMIRROR_NDEVICES; id++)
dmirror_device_remove(dmirror_devices + id);
unregister_chrdev_region(dmirror_dev, DMIRROR_NDEVICES);