From: sashiko-bot@kernel.org
To: "Magnus Lindholm" <linmag7@gmail.com>
Cc: linux-serial@vger.kernel.org
Subject: Re: [PATCH v4 03/10] sparc64: avoid huge kernel PUD mappings with small hardware pages
Date: Sun, 18 Oct 2026 13:53:59 +0000 [thread overview]
Message-ID: <sashiko-outbox-176165@kernel.org> (raw)
In-Reply-To: <20261018134738.1016106-4-linmag7@gmail.com>
> The kernel PUD refill path merges virtual address bits 32:28 into a
> TTE, requiring hardware pages of at least 256MB. Sun4u instead selects
> 4MB pages, losing bits 27:22 when refilling a huge PUD. Sun4v also falls
> back to 4MB pages when neither 256MB nor 2GB pages are selected.
>
> Keep PMD mappings when the selected PUD encoding matches the small-page
> entry. The PMD refill path preserves the bits needed by the 4MB TTE;
> sun4v selections of 256MB or larger remain eligible for huge PUDs.
>
> Fixes: 0dd5b7b09e13 ("sparc64: Fix physical memory management regressions with large max_phys_bits.")
> Cc: stable@vger.kernel.org
> Signed-off-by: Magnus Lindholm <linmag7@gmail.com>
Sashiko has reviewed this patch and found no issues.
--
Sashiko AI review · https://sashiko.dev/#/patchset/20261018134738.1016106-1-linmag7@gmail.com?part=3
next prev parent reply other threads:[~2026-10-18 13:53 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-18 13:45 [PATCH v4 00/10] sparc64: add Fujitsu M3000 support Magnus Lindholm
2026-10-18 13:45 ` [PATCH v4 01/10] sparc64: return from the generic clear_page implementation Magnus Lindholm
2026-10-18 13:52 ` sashiko-bot
2026-10-18 13:45 ` [PATCH v4 02/10] sparc64: honor queued spinlock layout in secondary startup Magnus Lindholm
2026-10-18 14:01 ` sashiko-bot
2026-10-18 13:45 ` [PATCH v4 03/10] sparc64: avoid huge kernel PUD mappings with small hardware pages Magnus Lindholm
2026-10-18 13:53 ` sashiko-bot [this message]
2026-10-18 13:45 ` [PATCH v4 04/10] sparc64: stop IRQ setup when descriptor allocation fails Magnus Lindholm
2026-10-18 13:52 ` sashiko-bot
2026-10-18 13:45 ` [PATCH v4 05/10] sparc64: validate Fire register properties before initialization Magnus Lindholm
2026-10-18 13:52 ` sashiko-bot
2026-10-18 13:45 ` [PATCH v4 06/10] sparc64: retain the DMA segment start across SG entries Magnus Lindholm
2026-10-18 13:52 ` sashiko-bot
2026-10-18 13:45 ` [PATCH v4 07/10] sparc64: zero newly allocated IOMMU page tables Magnus Lindholm
2026-10-18 13:52 ` sashiko-bot
2026-10-18 13:45 ` [PATCH v4 08/10] sparc64: add SPARC64 VII CPU, MMU and SMP support Magnus Lindholm
2026-10-18 14:22 ` sashiko-bot
2026-10-18 13:45 ` [PATCH v4 09/10] sparc64: add M3000 Oberon PCIe support Magnus Lindholm
2026-10-18 13:57 ` sashiko-bot
2026-10-18 13:45 ` [PATCH v4 10/10] hvc: add an M3000 firmware console backend Magnus Lindholm
2026-10-18 14:09 ` sashiko-bot
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