evie/android_kernel_oneplus_msm8998
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kaiser: tidied up kaiser_add/remove_mapping slightly

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Yes, unmap_pud_range_nofree()'s declaration ought to be in a
header file really, but I'm not sure we want to use it anyway:
so for now just declare it inside kaiser_remove_mapping().
And there doesn't seem to be such a thing as unmap_p4d_range(),
even in a 5-level paging tree.

Signed-off-by: Hugh Dickins <hughd@google.com>
Acked-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Hugh Dickins 2017-09-03 19:23:08 -07:00 • committed by Greg Kroah-Hartman
parent 5fbd46c4be
commit 0c68228f7b
1 changed files with 3 additions and 6 deletions
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9
arch/x86/mm/kaiser.c
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@ -286,8 +286,7 @@ void __init kaiser_init(void)
__PAGE_KERNEL);
}
extern void unmap_pud_range_nofree(pgd_t *pgd, unsigned long start, unsigned long end);
// add a mapping to the shadow-mapping, and synchronize the mappings
/* Add a mapping to the shadow mapping, and synchronize the mappings */
int kaiser_add_mapping(unsigned long addr, unsigned long size, unsigned long flags)
{
return kaiser_add_user_map((const void *)addr, size, flags);
@ -295,15 +294,13 @@ int kaiser_add_mapping(unsigned long addr, unsigned long size, unsigned long fla
void kaiser_remove_mapping(unsigned long start, unsigned long size)
{
extern void unmap_pud_range_nofree(pgd_t *pgd,
unsigned long start, unsigned long end);
unsigned long end = start + size;
unsigned long addr;
for (addr = start; addr < end; addr += PGDIR_SIZE) {
pgd_t *pgd = native_get_shadow_pgd(pgd_offset_k(addr));
/*
* unmap_p4d_range() handles > P4D_SIZE unmaps,
* so no need to trim 'end'.
*/
unmap_pud_range_nofree(pgd, addr, end);
}
}