9:43 a.m.
On Wed, Jun 9, 2021 at 3:43 PM kernel test robot <lkp(a)intel.com> wrote:
Hi Dan,
FYI, the error/warning still remains.
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 368094df48e680fa51cedb68537408cfa64b788e
commit: ec6347bb43395cb92126788a1a5b25302543f815 x86, powerpc: Rename memcpy_mcsafe() to
copy_mc_to_{user, kernel}()
date: 8 months ago
config: x86_64-randconfig-r025-20210610 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
#
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit...
git remote add linus
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout ec6347bb43395cb92126788a1a5b25302543f815
# save the attached .config to linux build tree
make W=1 ARCH=x86_64
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp(a)intel.com>
All warnings (new ones prefixed by >>):
>> arch/x86/lib/copy_mc.c:30:1: warning: no previous prototype for
'copy_mc_fragile_handle_tail' [-Wmissing-prototypes]
30 | copy_mc_fragile_handle_tail(char *to, char *from, unsigned len)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~
This routine is only ever called from ASM code, so the fact that there
is no C declaration is expected.
For W=1 builds we could do something like this:
diff --git a/arch/x86/lib/Makefile b/arch/x86/lib/Makefile
index bad4dee4f0e4..b87f40cbc3d5 100644
--- a/arch/x86/lib/Makefile
+++ b/arch/x86/lib/Makefile
@@ -44,6 +44,7 @@ obj-$(CONFIG_SMP) += msr-smp.o cache-smp.o
lib-y := delay.o misc.o cmdline.o cpu.o
lib-y += usercopy_$(BITS).o usercopy.o getuser.o putuser.o
lib-y += memcpy_$(BITS).o
+CFLAGS_copy_mc.o = -Wno-strict-prototypes
lib-$(CONFIG_ARCH_HAS_COPY_MC) += copy_mc.o copy_mc_64.o
lib-$(CONFIG_INSTRUCTION_DECODER) += insn.o inat.o insn-eval.o
lib-$(CONFIG_RANDOMIZE_BASE) += kaslr.o
...but I don't like it nor adding a dummy declaration.