MIPS: BCM47XX: Cast memcmp() of function to (void *)

[ Upstream commit 0dedcf6e3301836eb70cfa649052e7ce4fcd13ba ]

Clang is especially sensitive about argument type matching when using
__overloaded functions (like memcmp(), etc). Help it see that function
pointers are just "void *". Avoids this error:

arch/mips/bcm47xx/prom.c:89:8: error: no matching function for call to 'memcmp'
                   if (!memcmp(prom_init, prom_init + mem, 32))
                        ^~~~~~
include/linux/string.h:156:12: note: candidate function not viable: no known conversion from 'void (void)' to 'const void *' for 1st argument extern int memcmp(const void *,const void *,__kernel_size_t);

Cc: Hauke Mehrtens <hauke@hauke-m.de>
Cc: "Rafał Miłecki" <zajec5@gmail.com>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: linux-mips@vger.kernel.org
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: llvm@lists.linux.dev
Reported-by: kernel test robot <lkp@intel.com>
Link: https://lore.kernel.org/lkml/202209080652.sz2d68e5-lkp@intel.com
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/arch/mips/bcm47xx/prom.c b/arch/mips/bcm47xx/prom.c
index 0a63721..5a33d6b 100644 (file)
--- a/arch/mips/bcm47xx/prom.c
+++ b/arch/mips/bcm47xx/prom.c
@@ -86,7 +86,7 @@ static __init void prom_init_mem(void)
                        pr_debug("Assume 128MB RAM\n");
                        break;
                }
-               if (!memcmp(prom_init, prom_init + mem, 32))
+               if (!memcmp((void *)prom_init, (void *)prom_init + mem, 32))
                        break;
        }
        lowmem = mem;
@@ -159,7 +159,7 @@ void __init bcm47xx_prom_highmem_init(void)
 
        off = EXTVBASE + __pa(off);
        for (extmem = 128 << 20; extmem < 512 << 20; extmem <<= 1) {
-               if (!memcmp(prom_init, (void *)(off + extmem), 16))
+               if (!memcmp((void *)prom_init, (void *)(off + extmem), 16))
                        break;
        }
        extmem -= lowmem;