From: Arnd Bergmann Date: Tue, 14 Feb 2017 21:27:01 +0000 (+0100) Subject: arm64: fix warning about swapper_pg_dir overflow X-Git-Tag: v4.11-rc1~120^2~5 X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=12f043ff2b28fa64c9123b454cbe30a8a9e1967e;p=linux.git arm64: fix warning about swapper_pg_dir overflow With 4 levels of 16KB pages, we get this warning about the fact that we are copying a whole page into an array that is declared as having only two pointers for the top level of the page table: arch/arm64/mm/mmu.c: In function 'paging_init': arch/arm64/mm/mmu.c:528:2: error: 'memcpy' writing 16384 bytes into a region of size 16 overflows the destination [-Werror=stringop-overflow=] This is harmless since we actually reserve a whole page in the definition of the array that comes from, and just the extern declaration is short. The pgdir is initialized to zero either way, so copying the actual entries here seems like the best solution. Acked-by: Ard Biesheuvel Acked-by: Mark Rutland Signed-off-by: Arnd Bergmann Signed-off-by: Will Deacon --- diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c index 2131521ddc24..b805c017f789 100644 --- a/arch/arm64/mm/mmu.c +++ b/arch/arm64/mm/mmu.c @@ -525,7 +525,7 @@ void __init paging_init(void) * To do this we need to go via a temporary pgd. */ cpu_replace_ttbr1(__va(pgd_phys)); - memcpy(swapper_pg_dir, pgd, PAGE_SIZE); + memcpy(swapper_pg_dir, pgd, PGD_SIZE); cpu_replace_ttbr1(lm_alias(swapper_pg_dir)); pgd_clear_fixmap();