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

Ryan Roberts
2024-10-14T11:50:36Z

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@arm.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