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xtensa: use MEMBLOCK_ALLOC_ANYWHERE for KASAN shadow map

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commit e64681b487c897ec871465083bf0874087d47b66 upstream.

KASAN shadow map doesn't need to be accessible through the linear kernel
mapping, allocate its pages with MEMBLOCK_ALLOC_ANYWHERE so that high
memory can be used. This frees up to ~100MB of low memory on xtensa
configurations with KASAN and high memory.

Cc: stable@vger.kernel.org # v5.1+
Fixes: f240ec09bb8a ("memblock: replace memblock_alloc_base(ANYWHERE) with memblock_phys_alloc")
Reviewed-by: Mike Rapoport <rppt@linux.ibm.com>
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Max Filippov 2019-11-13 16:06:42 -08:00 committed by Greg Kroah-Hartman
parent 06ad673b6c
commit 1948e76afc
1 changed files with 3 additions and 1 deletions
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4
arch/xtensa/mm/kasan_init.c
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@ -56,7 +56,9 @@ static void __init populate(void *start, void *end)
for (k = 0; k < PTRS_PER_PTE; ++k, ++j) {
phys_addr_t phys =
memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
memblock_phys_alloc_range(PAGE_SIZE, PAGE_SIZE,
0,
MEMBLOCK_ALLOC_ANYWHERE);
if (!phys)
panic("Failed to allocate page table page\n");