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| author | Mike Rapoport <rppt@linux.ibm.com> | 2021-12-13 12:41:31 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-12-17 12:14:42 +0300 |
| commit | b4b54c7ba149ffa2dcb11b2a84ebf20189ff7f89 (patch) | |
| tree | 59f9922f2913e5227faf248467d040e17006cd4d /arch/arm | |
| parent | b6a1cbd187fc7addddcb9c669f7362dec4d54595 (diff) | |
| download | linux-b4b54c7ba149ffa2dcb11b2a84ebf20189ff7f89.tar.xz | |
memblock: free_unused_memmap: use pageblock units instead of MAX_ORDER
[ Upstream commit e2a86800d58639b3acde7eaeb9eb393dca066e08 ]
The code that frees unused memory map uses rounds start and end of the
holes that are freed to MAX_ORDER_NR_PAGES to preserve continuity of the
memory map for MAX_ORDER regions.
Lots of core memory management functionality relies on homogeneity of the
memory map within each pageblock which size may differ from MAX_ORDER in
certain configurations.
Although currently, for the architectures that use free_unused_memmap(),
pageblock_order and MAX_ORDER are equivalent, it is cleaner to have common
notation thought mm code.
Replace MAX_ORDER_NR_PAGES with pageblock_nr_pages and update the comments
to make it more clear why the alignment to pageblock boundaries is
required.
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>
Diffstat (limited to 'arch/arm')
| -rw-r--r-- | arch/arm/mm/init.c | 16 |
1 files changed, 8 insertions, 8 deletions
diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c index 75f3ab531bdf..8440b6027598 100644 --- a/arch/arm/mm/init.c +++ b/arch/arm/mm/init.c @@ -315,11 +315,11 @@ static void __init free_unused_memmap(void) ALIGN(prev_end, PAGES_PER_SECTION)); #else /* - * Align down here since the VM subsystem insists that the - * memmap entries are valid from the bank start aligned to - * MAX_ORDER_NR_PAGES. + * 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, MAX_ORDER_NR_PAGES); + start = round_down(start, pageblock_nr_pages); #endif /* * If we had a previous bank, and there is a space @@ -329,11 +329,11 @@ static void __init free_unused_memmap(void) free_memmap(prev_end, start); /* - * Align up here since the VM subsystem insists that the - * memmap entries are valid from the bank end aligned to - * MAX_ORDER_NR_PAGES. + * Align up here since many operations in VM subsystem + * presume that there are no holes in the memory map inside + * a pageblock */ - prev_end = ALIGN(end, MAX_ORDER_NR_PAGES); + prev_end = ALIGN(end, pageblock_nr_pages); } #ifdef CONFIG_SPARSEMEM |