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staging: vc04_services: Convert kmap() to kmap_local_page()

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The use of kmap() is being deprecated in favor of kmap_local_page()
where it is feasible. In file interface/vchiq_arm/vchiq_arm.c,
function free_pagelist() calls kmap() / kunmap() from two places.

With kmap_local_page(), the mapping is per thread, CPU local and not
globally visible. Therefore, free_pagelist() is a function where the
use of kmap_local_page() in place of kmap() is correctly suited.

Convert to kmap_local_page() but, instead of open coding it, use the
memcpy_to_page() helper.

Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Fabio M. De Francesco <fmdefrancesco@gmail.com>
Link: https://lore.kernel.org/r/20220330191414.23141-1-fmdefrancesco@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Fabio M. De Francesco 2022-03-30 21:14:14 +02:00 committed by Greg Kroah-Hartman
parent 8a56b5ce77
commit 47f46a873d
1 changed files with 5 additions and 8 deletions
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13
drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
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@ -431,21 +431,18 @@ free_pagelist(struct vchiq_pagelist_info *pagelistinfo,
if (head_bytes > actual)
head_bytes = actual;
memcpy((char *)kmap(pages[0]) +
memcpy_to_page(pages[0],
pagelist->offset,
fragments,
head_bytes);
kunmap(pages[0]);
}
if ((actual >= 0) && (head_bytes < actual) &&
(tail_bytes != 0)) {
memcpy((char *)kmap(pages[num_pages - 1]) +
((pagelist->offset + actual) &
(PAGE_SIZE - 1) & ~(g_cache_line_size - 1)),
(tail_bytes != 0))
memcpy_to_page(pages[num_pages - 1],
(pagelist->offset + actual) &
(PAGE_SIZE - 1) & ~(g_cache_line_size - 1),
fragments + g_cache_line_size,
tail_bytes);
kunmap(pages[num_pages - 1]);
}
down(&g_free_fragments_mutex);
*(char **)fragments = g_free_fragments;