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authorKees Cook <keescook@chromium.org>2022-02-02 14:13:15 -0800
committerKees Cook <keescook@chromium.org>2022-02-13 16:48:04 -0800
commit545c272232caded141abb273745091d6a0d8b14b (patch)
tree091251f61e02f2712f02da2daeb50fa2426cf061 /arch/alpha/mm
parent2a55550fbba643f41318bb12ab20e6510c7df231 (diff)
alpha: Silence -Warray-bounds warnings
GCC 11 (incorrectly[1]) assumes that literal values cast to (void *) should be treated like a NULL pointer with an offset, and raises diagnostics when doing bounds checking: In function '__memset', inlined from '__bad_pagetable' at arch/alpha/mm/init.c:79:2: ./arch/alpha/include/asm/string.h:37:32: error: '__builtin_memset' offset [0, 8191] is out of the bounds [0, 0] [-Werror=array-bounds] 37 | return __builtin_memset(s, c, n); | ^~~~~~~~~~~~~~~~~~~~~~~~~ In function '__memset', inlined from '__bad_page' at arch/alpha/mm/init.c:86:2: ./arch/alpha/include/asm/string.h:37:32: error: '__builtin_memset' offset [0, 8191] is out of the bounds [0, 0] [-Werror=array-bounds] 37 | return __builtin_memset(s, c, n); | ^~~~~~~~~~~~~~~~~~~~~~~~~ In function '__memset', inlined from 'paging_init' at arch/alpha/mm/init.c:256:2: ./arch/alpha/include/asm/string.h:37:32: error: '__builtin_memset' offset [0, 8191] is out of the bounds [0, 0] [-Werror=array-bounds] 37 | return __builtin_memset(s, c, n); This has been solved in other places[2] already by using the recently added absolute_pointer() macro. Do the same here. [1] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99578 [2] https://lore.kernel.org/all/20210912160149.2227137-1-linux@roeck-us.net/ Cc: Richard Henderson <rth@twiddle.net> Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: Matt Turner <mattst88@gmail.com> Cc: Guenter Roeck <linux@roeck-us.net> Cc: linux-alpha@vger.kernel.org Reviewed-and-tested-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Kees Cook <keescook@chromium.org>
Diffstat (limited to 'arch/alpha/mm')
-rw-r--r--arch/alpha/mm/init.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/alpha/mm/init.c b/arch/alpha/mm/init.c
index f6114d03357c..7511723b7669 100644
--- a/arch/alpha/mm/init.c
+++ b/arch/alpha/mm/init.c
@@ -76,14 +76,14 @@ pgd_alloc(struct mm_struct *mm)
pmd_t *
__bad_pagetable(void)
{
- memset((void *) EMPTY_PGT, 0, PAGE_SIZE);
+ memset(absolute_pointer(EMPTY_PGT), 0, PAGE_SIZE);
return (pmd_t *) EMPTY_PGT;
}
pte_t
__bad_page(void)
{
- memset((void *) EMPTY_PGE, 0, PAGE_SIZE);
+ memset(absolute_pointer(EMPTY_PGE), 0, PAGE_SIZE);
return pte_mkdirty(mk_pte(virt_to_page(EMPTY_PGE), PAGE_SHARED));
}
@@ -253,7 +253,7 @@ void __init paging_init(void)
free_area_init(max_zone_pfn);
/* Initialize the kernel's ZERO_PGE. */
- memset((void *)ZERO_PGE, 0, PAGE_SIZE);
+ memset(absolute_pointer(ZERO_PGE), 0, PAGE_SIZE);
}
#if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_SRM)