diff mbox series

[5.10,2/5] memblock: align freed memory map on pageblock boundaries with SPARSEMEM

Message ID 20211213094135.1798-3-mark-pk.tsai@mediatek.com (mailing list archive)
State New, archived
Headers show
Series memblock, arm: fixes for freeing of the memory map | expand

Commit Message

Mark-PK Tsai (蔡沛剛) Dec. 13, 2021, 9:41 a.m. UTC 
From: Mike Rapoport <rppt@linux.ibm.com>

[ Upstream commit f921f53e089a12a192808ac4319f28727b35dc0f ]

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>
---
 arch/arm/mm/init.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)
diff mbox series

Patch

diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c
index 8440b6027598..7fd049cbc5b0 100644
--- a/arch/arm/mm/init.c
+++ b/arch/arm/mm/init.c
@@ -313,14 +313,14 @@  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.
@@ -337,9 +337,11 @@  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(end, pageblock_nr_pages);
 		free_memmap(prev_end,
 			    ALIGN(prev_end, PAGES_PER_SECTION));
+	}
 #endif
 }