From 35545f0ccbd5a8ee01ba6824a2c68c0dcb787180 Mon Sep 17 00:00:00 2001 From: Mark Rutland Date: Fri, 5 Dec 2014 12:34:54 +0000 Subject: [PATCH] arm64: mm: dump: fix shift warning MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit When building with 48-bit VAs, it's possible to get the following warning when building the arm64 page table dumping code: arch/arm64/mm/dump.c: In function ‘walk_pgd’: arch/arm64/mm/dump.c:266:2: warning: right shift count >= width of type pgd_t *pgd = pgd_offset(mm, 0); ^ As pgd_offset is a macro and the second argument is not cast to any particular type, the zero will be given integer type by the compiler. As pgd_offset passes the pargument to pgd_index, we then try to shift the 32-bit integer by at least 39 bits (for 4k pages). Elsewhere the pgd_offset is passed a second argument of unsigned long type, so let's do the same here by passing '0UL' rather than '0'. Cc: Kees Cook Acked-by: Laura Abbott Acked-by: Steve Capper Signed-off-by: Mark Rutland Signed-off-by: Will Deacon --- arch/arm64/mm/dump.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm64/mm/dump.c b/arch/arm64/mm/dump.c index bf69601be546..a546776264c4 100644 --- a/arch/arm64/mm/dump.c +++ b/arch/arm64/mm/dump.c @@ -272,7 +272,7 @@ static void walk_pud(struct pg_state *st, pgd_t *pgd, unsigned long start) static void walk_pgd(struct pg_state *st, struct mm_struct *mm, unsigned long start) { - pgd_t *pgd = pgd_offset(mm, 0); + pgd_t *pgd = pgd_offset(mm, 0UL); unsigned i; unsigned long addr; -- 2.30.2