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From: Will Deacon <>
Subject: [GIT PULL] arm64 fix for 5.14
Date: Thu, 26 Aug 2021 14:17:48 +0100	[thread overview]
Message-ID: <20210826131747.GE26318@willie-the-truck> (raw)

Hi Linus,

Please pull this single arm64 fix for 5.14. We received a report this week
that the generic version of pfn_valid(), which we switched to this merge
window in 16c9afc77660 ("arm64/mm: drop HAVE_ARCH_PFN_VALID"), interacts
badly with dma_map_resource() due to the following check:

        /* Don't allow RAM to be mapped */
        if (WARN_ON_ONCE(pfn_valid(PHYS_PFN(phys_addr))))
                return DMA_MAPPING_ERROR;

Since the ongoing saga to determine the semantics of pfn_valid() is
unlikely to be resolved this week (does it indicate valid memory, or
just the presence of a struct page, or whether that struct page has been
initialised?), just revert back to our old version of pfn_valid() for




The following changes since commit bde8fff82e4a4b0f000dbf4d5eadab2079be0b56:

  arm64: initialize all of CNTHCTL_EL2 (2021-08-19 10:02:10 +0100)

are available in the Git repository at:

  git:// tags/arm64-fixes

for you to fetch changes up to 3eb9cdffb39701743973382860f214026f4d7825:

  Partially revert "arm64/mm: drop HAVE_ARCH_PFN_VALID" (2021-08-25 11:33:24 +0100)

arm64 fix for 5.14

- Fix dma_map_resource() by reverting back to old pfn_valid() code

Will Deacon (1):
      Partially revert "arm64/mm: drop HAVE_ARCH_PFN_VALID"

 arch/arm64/Kconfig            |  1 +
 arch/arm64/include/asm/page.h |  1 +
 arch/arm64/mm/init.c          | 37 +++++++++++++++++++++++++++++++++++++
 3 files changed, 39 insertions(+)

             reply	other threads:[~2021-08-26 13:17 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-26 13:17 Will Deacon [this message]
2021-08-26 18:41 ` Linus Torvalds
2021-08-27  7:40   ` Christoph Hellwig
2021-08-27 17:03     ` Linus Torvalds
2021-08-27 17:10       ` Christoph Hellwig
2021-08-27 17:16         ` Linus Torvalds
2021-08-31 13:31           ` Will Deacon
2021-08-31 19:16             ` David Hildenbrand
2021-08-31 16:56           ` Catalin Marinas
2021-08-26 18:52 ` pr-tracker-bot

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