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@xxxxxxxxxx>
Cc: "Rafał Miłecki" <zajec5@xxxxxxxxx>
Cc: Thomas Bogendoerfer <tsbogend@xxxxxxxxxxxxxxxx>
Cc: linux-mips@xxxxxxxxxxxxxxx
Cc: Nathan Chancellor <nathan@xxxxxxxxxx>
Cc: Nick Desaulniers <ndesaulniers@xxxxxxxxxx>
Cc: llvm@xxxxxxxxxxxxxxx
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Link: https://lore.kernel.org/lkml/202209080652.sz2d68e5-lkp@xxxxxxxxx
Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
---
arch/mips/bcm47xx/prom.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/mips/bcm47xx/prom.c b/arch/mips/bcm47xx/prom.c
index ab203e66ba0d..eb5c04a24531 100644
--- 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;
--
2.34.1
