From: Linus Torvalds Date: Mon, 29 Apr 2019 16:51:29 +0000 (-0700) Subject: x86: make ZERO_PAGE() at least parse its argument X-Git-Tag: v5.4-rc1~1167 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=80871482fd5cb1cb396ea232237a7d9c540854f9;p=platform%2Fkernel%2Flinux-rpi.git x86: make ZERO_PAGE() at least parse its argument This doesn't really do anything, but at least we now parse teh ZERO_PAGE() address argument so that we'll catch the most obvious errors in usage next time they'll happen. See commit 6a5c5d26c4c6 ("rdma: fix build errors on s390 and MIPS due to bad ZERO_PAGE use") what happens when we don't have any use of the macro argument at all. Signed-off-by: Linus Torvalds --- diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h index 2779ace..50b3e2d 100644 --- a/arch/x86/include/asm/pgtable.h +++ b/arch/x86/include/asm/pgtable.h @@ -46,7 +46,7 @@ void ptdump_walk_user_pgd_level_checkwx(void); */ extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)] __visible; -#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page)) +#define ZERO_PAGE(vaddr) ((void)(vaddr),virt_to_page(empty_zero_page)) extern spinlock_t pgd_lock; extern struct list_head pgd_list;