A-Team_Digital_Solutions/android_kernel_motorola_sm6375
Watch
2
0
Fork
You've already forked android_kernel_motorola_sm6375
 0
mirror of https://github.com/BobTheBlinker/android_kernel_motorola_sm6375.git synced 2026-10-13 16:16:15 -04:00
Code Issues Projects Releases Packages Wiki Activity

soc: qcom: mem-offline: Clear page-table entries after offline

Browse source 
After a memory block is offlined, the page-table entries should be removed
in order to avoid any CPU speculative accesses happening on this region.
Clear off the entries at the leaf levels (PUD or PMD) on a block mapped
memory region. This only zeroes the entries and does not free the page
table memory. During online, we create mappings again for these regions.

Change-Id: I71091c33589645567c60457ba569dd393ddcab59
Signed-off-by: Sudarshan Rajagopalan <sudaraja@codeaurora.org>
[isaacm@codeaurora.org: resolve merge conflicts]
Signed-off-by: Isaac J. Manjarres <isaacm@codeaurora.org>
This commit is contained in:
Sudarshan Rajagopalan 2019-03-14 15:33:45 -07:00 • committed by Isaac J. Manjarres
commit fdee3b6ba8
2 changed files with 9 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

8
arch/arm64/mm/mmu.c
View file

@ -391,6 +391,14 @@ static phys_addr_t pgd_pgtable_alloc(int shift)
return pa;
}
void create_pgtable_mapping(phys_addr_t start, phys_addr_t end)
{
unsigned long virt = (unsigned long)phys_to_virt(start);
__create_pgd_mapping(init_mm.pgd, start, virt, end - start,
PAGE_KERNEL, NULL, 0);
}
/*
* This function can only be used to modify existing table entries,
* without allocating new levels of table. Note that this permits the

2
include/linux/memblock.h
View file

@ -145,7 +145,7 @@ void __next_reserved_mem_region(u64 *idx, phys_addr_t *out_start,
phys_addr_t *out_end);
void __memblock_free_late(phys_addr_t base, phys_addr_t size);
void create_pgtable_mapping(phys_addr_t start, phys_addr_t end);
/**
* for_each_mem_range - iterate through memblock areas from type_a and not
* included in type_b. Or just type_a if type_b is NULL.