From: sashiko-bot@kernel.org
To: "Radhey Shyam Pandey" <radhey.shyam.pandey@amd.com>,
robh@kernel.org, saravanak@kernel.org, akpm@linux-foundation.org,
david@kernel.org, ljs@kernel.org, liam@infradead.org,
vbabka@kernel.org, rppt@kernel.org, surenb@google.com,
mhocko@suse.com, m.szyprowski@samsung.com, robin.murphy@arm.com,
baoquan.he@linux.dev, pasha.tatashin@soleen.com,
pratyush@kernel.org
Cc: kexec@lists.infradead.org
Subject: Re: [PATCH 1/4] kexec: do not place the next kernel in a fixed-address CMA area
Date: Wed, 04 Nov 2026 16:29:44 +0000 [thread overview]
Message-ID: <sashiko-outbox-197612@kernel.org> (raw)
In-Reply-To: <20261103162429.2053989-2-radhey.shyam.pandey@amd.com>
> kexec_alloc_contig() takes the next kernel's destination from the default
> CMA area and the next kernel runs from there in place, which is safe only
> if that area does not exist at the same address in the kernel being loaded.
> For a device-tree area it does: the loaded kernel declares the range it is
> executing from as a shared-dma-pool and cma_activate_area() frees its own
> image to the page allocator. Record in CMA_DYNAMIC_BASE which areas CMA
> placed itself and accept only those, letting kexec_locate_mem_hole() fall
> back to the memblock search. "cma=nn" works, "cma=nn@ss" no longer does.
>
> Fixes: 07d24902977e ("kexec: enable CMA based contiguous allocation")
> Suggested-by: Mike Rapoport <rppt@kernel.org>
> Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@amd.com>
Sashiko has reviewed this patch and found no issues.
--
Sashiko AI review · https://sashiko.dev/#/patchset/20261103162429.2053989-1-radhey.shyam.pandey@amd.com?part=1
next prev parent reply other threads:[~2026-11-04 16:29 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-11-03 16:24 [PATCH 0/4] kexec,mm/cma: do not run the next kernel from a fixed-base CMA area Radhey Shyam Pandey
2026-11-03 16:24 ` [PATCH 1/4] kexec: do not place the next kernel in a fixed-address " Radhey Shyam Pandey
2026-11-04 16:29 ` sashiko-bot [this message]
2026-11-03 16:24 ` [PATCH 2/4] of: reserved_mem: keep the reservation when node_init returns -EBUSY Radhey Shyam Pandey
2026-11-04 16:29 ` sashiko-bot
2026-11-03 16:24 ` [PATCH 3/4] mm/cma: reject CMA areas that overlap the kernel image Radhey Shyam Pandey
2026-11-04 16:29 ` sashiko-bot
2026-11-03 16:24 ` [PATCH 4/4] mm/cma: drop the duplicate alignment check in rmem_cma_setup() Radhey Shyam Pandey
2026-11-04 16:29 ` sashiko-bot
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