linux-kernel - [PATCH 0/2] vmcoreinfo: support VMCOREINFO_BYTES larger than PAGE

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Message-ID: <20251216132801.807260-1-pnina.feder@mobileye.com>
Date: Tue, 16 Dec 2025 15:27:59 +0200
From: Pnina Feder <pnina.feder@...ileye.com>
To: Andrew Morton <akpm@...ux-foundation.org>,
	Baoquan He <bhe@...hat.com>
Cc: Vivek Goyal <vgoyal@...hat.com>,
	Dave Young <dyoung@...hat.com>,
	kexec@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Pnina Feder <pnina.feder@...ileye.com>
Subject: [PATCH 0/2] vmcoreinfo: support VMCOREINFO_BYTES larger than PAGE_SIZE

VMCOREINFO_BYTES is defined as a configurable size, but multiple
code paths implicitly assume it always fits into a single page.

This series removes that assumption by allocating and mapping
vmcoreinfo based on its actual size.

Patch 1 updates vmcoreinfo allocation to use get_order(VMCOREINFO_BYTES).
Patch 2 updates crash kernel handling to correctly allocate and map
multiple pages when copying vmcoreinfo.

This makes vmcoreinfo size consistent across the kernel and avoids
future breakage if VMCOREINFO_BYTES grows.

Tested on riscv64.

(No functional change when VMCOREINFO_BYTES == PAGE_SIZE.)

Pnina Feder (2):
  kernel: vmcoreinfo: allocate vmcoreinfo_data based on VMCOREINFO_BYTES
  kernel/crash: handle multi-page vmcoreinfo in crash kernel copy

 kernel/crash_core.c  | 17 +++++++++++++----
 kernel/vmcore_info.c |  6 ++++--
 2 files changed, 17 insertions(+), 6 deletions(-)

-- 
2.43.0