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memblock: align freed memory map on pageblock boundaries with SPARSEMEM

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commit f921f53e08 upstream.

When CONFIG_SPARSEMEM=y the ranges of the memory map that are freed are not
aligned to the pageblock boundaries which breaks assumptions about
homogeneity of the memory map throughout core mm code.

Make sure that the freed memory map is always aligned on pageblock
boundaries regardless of the memory model selection.

Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Tested-by: Tony Lindgren <tony@atomide.com>
Link: https://lore.kernel.org/lkml/20210630071211.21011-1-rppt@kernel.org/
[backport upstream modification in mm/memblock.c to arch/arm/mm/init.c]
Signed-off-by: Mark-PK Tsai <mark-pk.tsai@mediatek.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mike Rapoport 2021-12-13 16:57:07 +08:00 committed by Greg Kroah-Hartman
parent 60111b30be
commit bdca964781
1 changed files with 5 additions and 3 deletions
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8
arch/arm/mm/init.c
View file

@ -371,14 +371,14 @@ static void __init free_unused_memmap(void)
*/
start = min(start,
ALIGN(prev_end, PAGES_PER_SECTION));
#else
#endif
/*
* Align down here since many operations in VM subsystem
* presume that there are no holes in the memory map inside
* a pageblock
*/
start = round_down(start, pageblock_nr_pages);
#endif
/*
* If we had a previous bank, and there is a space
* between the current bank and the previous, free it.
@ -396,9 +396,11 @@ static void __init free_unused_memmap(void)
}
#ifdef CONFIG_SPARSEMEM
if (!IS_ALIGNED(prev_end, PAGES_PER_SECTION))
if (!IS_ALIGNED(prev_end, PAGES_PER_SECTION)) {
prev_end = ALIGN(prev_end, pageblock_nr_pages);
free_memmap(prev_end,
ALIGN(prev_end, PAGES_PER_SECTION));
}
#endif
}