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From: Mike Rapoport <rppt@linux.ibm.com>
To: Tony Lindgren <tony@atomide.com>
Cc: Mike Rapoport <rppt@kernel.org>,
	linux-arm-kernel@lists.infradead.org,
	Andrew Morton <akpm@linux-foundation.org>,
	Kefeng Wang <wangkefeng.wang@huawei.com>,
	Russell King <linux@armlinux.org.uk>,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org,
	linux-omap@vger.kernel.org, regressions@lists.linux.dev
Subject: Re: [PATCH v2 3/3] arm: extend pfn_valid to take into accound freed memory map alignment
Date: Tue, 29 Jun 2021 08:33:11 +0300	[thread overview]
Message-ID: <YNqwl8EPVYZJV0EF@linux.ibm.com> (raw)
In-Reply-To: <YNnqIv3PApHFZMgp@atomide.com>

On Mon, Jun 28, 2021 at 06:26:26PM +0300, Tony Lindgren wrote:
> * Mike Rapoport <rppt@linux.ibm.com> [210628 14:07]:
> > Can you please send log with 'memblock=debug' added to the command line?
> 
> Sure, log now available at:
> 
> http://muru.com/beagle-x15.txt

Hmm, no clues yet :(

Do you have CONFIG_DEBUG_VM, CONFIG_DEBUG_VM_PGFLAGS and
CONFIG_PAGE_POISONING enabled in your config?
If not, can you please enable them and see if any of VM_BUG_* triggers?

Do you use FLATMEM or SPARSEMEM in your config?

Let's try seeing what PFNs get false results from pfn_valid, maybe this
will give a better lead.

diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c
index 6162a070a410..66985fc3e730 100644
--- a/arch/arm/mm/init.c
+++ b/arch/arm/mm/init.c
@@ -126,10 +126,16 @@ int pfn_valid(unsigned long pfn)
 {
 	phys_addr_t addr = __pfn_to_phys(pfn);
 	unsigned long pageblock_size = PAGE_SIZE * pageblock_nr_pages;
+	bool overlaps = memblock_overlaps_region(&memblock.memory,
+				     ALIGN_DOWN(addr, pageblock_size),
+				     pageblock_size);
 
 	if (__phys_to_pfn(addr) != pfn)
 		return 0;
 
+	if (memblock_is_map_memory(addr) != overlaps)
+		pr_info("%s(%pS): pfn: %lx: is_map: %d overlaps: %d\n", __func__, (void *)_RET_IP_, pfn, memblock_is_map_memory(addr), overlaps);
+
 	/*
 	 * If address less than pageblock_size bytes away from a present
 	 * memory chunk there still will be a memory map entry for it

-- 
Sincerely yours,
Mike.

  reply	other threads:[~2021-06-29  5:33 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-19 14:14 [PATCH v2 0/3] memblock, arm: fixes for freeing of the memory map Mike Rapoport
2021-05-19 14:14 ` [PATCH v2 1/3] memblock: free_unused_memmap: use pageblock units instead of MAX_ORDER Mike Rapoport
2021-05-19 14:14 ` [PATCH v2 2/3] memblock: align freed memory map on pageblock boundaries with SPARSEMEM Mike Rapoport
2021-05-19 14:14 ` [PATCH v2 3/3] arm: extend pfn_valid to take into accound freed memory map alignment Mike Rapoport
2021-06-28 10:20   ` Tony Lindgren
2021-06-28 13:16     ` Mike Rapoport
2021-06-28 15:26       ` Tony Lindgren
2021-06-29  5:33         ` Mike Rapoport [this message]
2021-06-29  8:54           ` Tony Lindgren
2021-06-29 10:50             ` Mike Rapoport
2021-06-29 11:52               ` Tony Lindgren
2021-06-29 12:50                 ` Mike Rapoport
2021-06-29 12:53                   ` Tony Lindgren
2021-06-30  7:20                   ` Mike Rapoport
2021-05-20  6:21 ` [PATCH v2 0/3] memblock, arm: fixes for freeing of the memory map Kefeng Wang

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