diff options
| author | Ard Biesheuvel <ardb@kernel.org> | 2026-05-29 17:02:03 +0200 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2026-06-02 16:29:16 +0100 |
| commit | 99bad3e992e26addd2a7d779cfbe42c048abd808 (patch) | |
| tree | 6c937a5095d68815ac8c7136f317be4596ab43a5 | |
| parent | c0693153fb17069f536548396c5a7946692b8948 (diff) | |
sh: Drop cache flush of the zero page at boot
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 <ysato@users.sourceforge.jp>
Cc: Rich Felker <dalias@libc.org>
Cc: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Signed-off-by: Will Deacon <will@kernel.org>
| -rw-r--r-- | arch/sh/mm/init.c | 3 |
1 files changed, 0 insertions, 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" |