linux-kernel - [RFC PATCH v1 19/57] crash: Remove PAGE_SIZE compile-time constant assumption

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Message-ID: <20241014105912.3207374-19-ryan.roberts@arm.com>
Date: Mon, 14 Oct 2024 11:58:26 +0100
From: Ryan Roberts <ryan.roberts@....com>
To: Andrew Morton <akpm@...ux-foundation.org>,
	Anshuman Khandual <anshuman.khandual@....com>,
	Ard Biesheuvel <ardb@...nel.org>,
	Baoquan He <bhe@...hat.com>,
	Catalin Marinas <catalin.marinas@....com>,
	David Hildenbrand <david@...hat.com>,
	Greg Marsden <greg.marsden@...cle.com>,
	Ivan Ivanov <ivan.ivanov@...e.com>,
	Kalesh Singh <kaleshsingh@...gle.com>,
	Marc Zyngier <maz@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Matthias Brugger <mbrugger@...e.com>,
	Miroslav Benes <mbenes@...e.cz>,
	Will Deacon <will@...nel.org>
Cc: Ryan Roberts <ryan.roberts@....com>,
	kexec@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: [RFC PATCH v1 19/57] crash: Remove PAGE_SIZE compile-time constant assumption

To prepare for supporting boot-time page size selection, refactor code
to remove assumptions about PAGE_SIZE being compile-time constant. Code
intended to be equivalent when compile-time page size is active.

Updated BUILD_BUG_ON() to test against limit.

Signed-off-by: Ryan Roberts <ryan.roberts@....com>
---

***NOTE***
Any confused maintainers may want to read the cover note here for context:
https://lore.kernel.org/all/20241014105514.3206191-1-ryan.roberts@arm.com/

 kernel/crash_core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/crash_core.c b/kernel/crash_core.c
index 63cf89393c6eb..978c600a47ac8 100644
--- a/kernel/crash_core.c
+++ b/kernel/crash_core.c
@@ -465,7 +465,7 @@ static int __init crash_notes_memory_init(void)
 	 * Break compile if size is bigger than PAGE_SIZE since crash_notes
 	 * definitely will be in 2 pages with that.
 	 */
-	BUILD_BUG_ON(size > PAGE_SIZE);
+	BUILD_BUG_ON(size > PAGE_SIZE_MIN);
 
 	crash_notes = __alloc_percpu(size, align);
 	if (!crash_notes) {
-- 
2.43.0