From deba804c90642c8ed0f15ac1083663976d578f54 Mon Sep 17 00:00:00 2001 From: Orlando Arias Date: Tue, 16 May 2017 15:34:00 -0400 Subject: [PATCH] sparc: Fix -Wstringop-overflow warning Greetings, GCC 7 introduced the -Wstringop-overflow flag to detect buffer overflows in calls to string handling functions [1][2]. Due to the way ``empty_zero_page'' is declared in arch/sparc/include/setup.h, this causes a warning to trigger at compile time in the function mem_init(), which is subsequently converted to an error. The ensuing patch fixes this issue and aligns the declaration of empty_zero_page to that of other architectures. Thank you. Cheers, Orlando. [1] https://gcc.gnu.org/ml/gcc-patches/2016-10/msg02308.html [2] https://gcc.gnu.org/gcc-7/changes.html Signed-off-by: Orlando Arias -------------------------------------------------------------------------------- Signed-off-by: David S. Miller --- arch/sparc/include/asm/pgtable_32.h | 4 ++-- arch/sparc/include/asm/setup.h | 2 +- arch/sparc/mm/init_32.c | 2 +- 3 files changed, 4 insertions(+), 4 deletions(-) diff --git a/arch/sparc/include/asm/pgtable_32.h b/arch/sparc/include/asm/pgtable_32.h index ce6f56980aef..cf190728360b 100644 --- a/arch/sparc/include/asm/pgtable_32.h +++ b/arch/sparc/include/asm/pgtable_32.h @@ -91,9 +91,9 @@ extern unsigned long pfn_base; * ZERO_PAGE is a global shared page that is always zero: used * for zero-mapped memory areas etc.. */ -extern unsigned long empty_zero_page; +extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]; -#define ZERO_PAGE(vaddr) (virt_to_page(&empty_zero_page)) +#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page)) /* * In general all page table modifications should use the V8 atomic diff --git a/arch/sparc/include/asm/setup.h b/arch/sparc/include/asm/setup.h index 478bf6bb4598..3fae200dd251 100644 --- a/arch/sparc/include/asm/setup.h +++ b/arch/sparc/include/asm/setup.h @@ -16,7 +16,7 @@ extern char reboot_command[]; */ extern unsigned char boot_cpu_id; -extern unsigned long empty_zero_page; +extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]; extern int serial_console; static inline int con_is_present(void) diff --git a/arch/sparc/mm/init_32.c b/arch/sparc/mm/init_32.c index c6afe98de4d9..3bd0d513bddb 100644 --- a/arch/sparc/mm/init_32.c +++ b/arch/sparc/mm/init_32.c @@ -290,7 +290,7 @@ void __init mem_init(void) /* Saves us work later. */ - memset((void *)&empty_zero_page, 0, PAGE_SIZE); + memset((void *)empty_zero_page, 0, PAGE_SIZE); i = last_valid_pfn >> ((20 - PAGE_SHIFT) + 5); i += 1; -- 2.20.1