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

[Ryan Roberts]

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@xxxxxxx>
---

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

 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