Patch "arm: extend pfn_valid to take into account freed memory map alignment" has been added to the 5.10-stable tree

This is a note to let you know that I've just added the patch titled

    arm: extend pfn_valid to take into account freed memory map alignment

to the 5.10-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     arm-extend-pfn_valid-to-take-into-account-freed-memory-map-alignment.patch
and it can be found in the queue-5.10 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let [off-list ref] know about it.


From foo@baz Wed Dec 15 03:01:20 PM CET 2021
From: Mark-PK Tsai <mark-pk.tsai@mediatek.com>
Date: Mon, 13 Dec 2021 17:41:34 +0800
Subject: arm: extend pfn_valid to take into account freed memory map alignment
To: <redacted>
Cc: <rppt@kernel.org>, <akpm@linux-foundation.org>, <redacted>, <redacted>, <redacted>, <linux@armlinux.org.uk>, <redacted>, <tony@atomide.com>, <redacted>, <mark-pk.tsai@mediatek.com>, <redacted>
Message-ID: [ref]

From: Mike Rapoport <redacted>

[ Upstream commit a4d5613c4dc6d413e0733e37db9d116a2a36b9f3 ]

When unused memory map is freed the preserved part of the memory map is
extended to match pageblock boundaries because lots of core mm
functionality relies on homogeneity of the memory map within pageblock
boundaries.

Since pfn_valid() is used to check whether there is a valid memory map
entry for a PFN, make it return true also for PFNs that have memory map
entries even if there is no actual memory populated there.

Signed-off-by: Mike Rapoport <redacted>
Tested-by: Kefeng Wang <redacted>
Tested-by: Tony Lindgren <tony@atomide.com>
Link: https://lore.kernel.org/lkml/20210630071211.21011-1-rppt@kernel.org/ (local)
Signed-off-by: Mark-PK Tsai <mark-pk.tsai@mediatek.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 arch/arm/mm/init.c |   13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

--- a/arch/arm/mm/init.c
+++ b/arch/arm/mm/init.c

@@ -125,11 +125,22 @@ static void __init zone_sizes_init(unsig
 int pfn_valid(unsigned long pfn)
 {
 	phys_addr_t addr = __pfn_to_phys(pfn);
+	unsigned long pageblock_size = PAGE_SIZE * pageblock_nr_pages;
 
 	if (__phys_to_pfn(addr) != pfn)
 		return 0;
 
-	return memblock_is_map_memory(addr);
+	/*
+	 * If address less than pageblock_size bytes away from a present
+	 * memory chunk there still will be a memory map entry for it
+	 * because we round freed memory map to the pageblock boundaries.
+	 */
+	if (memblock_overlaps_region(&memblock.memory,
+				     ALIGN_DOWN(addr, pageblock_size),
+				     pageblock_size))
+		return 1;
+
+	return 0;
 }
 EXPORT_SYMBOL(pfn_valid);
 #endif

Patches currently in stable-queue which might be from mark-pk.tsai@mediatek.com are

queue-5.10/arm-extend-pfn_valid-to-take-into-account-freed-memory-map-alignment.patch
queue-5.10/arm-ioremap-don-t-abuse-pfn_valid-to-check-if-pfn-is-in-ram.patch
queue-5.10/memblock-free_unused_memmap-use-pageblock-units-instead-of-max_order.patch
queue-5.10/memblock-align-freed-memory-map-on-pageblock-boundaries-with-sparsemem.patch
queue-5.10/memblock-ensure-there-is-no-overflow-in-memblock_overlaps_region.patch

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