From: Ard Biesheuvel <[email protected]>
SuperH performs cache maintenance on the zero page during boot,
presumably because before commit
6215d9f4470f ("arch, mm: consolidate empty_zero_page")
the zero page did double duty as a boot params region, and was cleared
separately, as it was not part of BSS. The memset() in question was
dropped by that commit, but the __flush_wback_region() call remained.
As empty_zero_page[] has been moved to BSS, it can be treated as any
other BSS memory, and so the cache flush can be dropped.
Cc: Yoshinori Sato <[email protected]>
Cc: Rich Felker <[email protected]>
Cc: John Paul Adrian Glaubitz <[email protected]>
Cc: Mike Rapoport <[email protected]>
Cc: Geert Uytterhoeven <[email protected]>
Signed-off-by: Ard Biesheuvel <[email protected]>
---
arch/sh/mm/init.c | 3 ---
1 file changed, 3 deletions(-)
diff --git a/arch/sh/mm/init.c b/arch/sh/mm/init.c
index 4e40d5e96be9..110308bdef01 100644
--- a/arch/sh/mm/init.c
+++ b/arch/sh/mm/init.c
@@ -331,9 +331,6 @@ void __init mem_init(void)
/* Set this up early, so we can take care of the zero page */
cpu_cache_init();
- /* clear the zero-page */
- __flush_wback_region(empty_zero_page, PAGE_SIZE);
-
vsyscall_init();
pr_info("virtual kernel memory layout:\n"
--
2.54.0.823.g6e5bcc1fc9-goog
