[linux-stable-rc:linux-4.19.y 4058/6859] lib/mpi/generic_mpih-mul1.c:50:24: error: invalid use of a cast in a inline asm context requiring an lvalue: remove the cast or build with -fheinous-gnu-extensions

Friday, 19 February 2021

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git
linux-4.19.y
head:   3a10b2060ca30843d9251b80a2e1ca71e68035bd
commit: f66a52d991de7ca6c6dc7db768b50e6a28916d1f [4058/6859] kbuild: clang: choose
GCC_TOOLCHAIN_DIR not on LD
config: mips-randconfig-r022-20210219 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project
c9439ca36342fb6013187d0a69aef92736951476)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O
~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install mips cross compiling tool for clang build
        # apt-get install binutils-mips-linux-gnu
        #
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.gi...
        git remote add linux-stable-rc
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git
        git fetch --no-tags linux-stable-rc linux-4.19.y
        git checkout f66a52d991de7ca6c6dc7db768b50e6a28916d1f
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=mips 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp(a)intel.com&gt;

All errors (new ones prefixed by >>):

   In file included from lib/mpi/generic_mpih-mul1.c:29:
   In file included from lib/mpi/mpi-internal.h:33:
   In file included from include/linux/module.h:9:
   In file included from include/linux/list.h:9:
   In file included from include/linux/kernel.h:11:
   In file included from include/linux/bitops.h:19:
   In file included from arch/mips/include/asm/bitops.h:19:
   In file included from arch/mips/include/uapi/asm/byteorder.h:15:
   In file included from include/linux/byteorder/little_endian.h:11:
   include/linux/byteorder/generic.h:195:16: warning: comparison of integers of different
signs: 'int' and 'size_t' (aka 'unsigned int') [-Wsign-compare]
           for (i = 0; i < len; i++)
                       ~ ^ ~~~
   include/linux/byteorder/generic.h:203:16: warning: comparison of integers of different
signs: 'int' and 'size_t' (aka 'unsigned int') [-Wsign-compare]
           for (i = 0; i < len; i++)
                       ~ ^ ~~~
   In file included from lib/mpi/generic_mpih-mul1.c:29:
   In file included from lib/mpi/mpi-internal.h:33:
   In file included from include/linux/module.h:10:
   In file included from include/linux/stat.h:19:
   In file included from include/linux/time.h:6:
   In file included from include/linux/seqlock.h:36:
   In file included from include/linux/spinlock.h:51:
   In file included from include/linux/preempt.h:81:
   In file included from ./arch/mips/include/generated/asm/preempt.h:1:
   In file included from include/asm-generic/preempt.h:5:
   include/linux/thread_info.h:141:29: warning: comparison of integers of different signs:
'int' and 'size_t' (aka 'unsigned int') [-Wsign-compare]
           if (unlikely(sz >= 0 && sz < bytes)) {
                                   ~~ ^ ~~~~~
   include/linux/compiler.h:77:42: note: expanded from macro 'unlikely'
   # define unlikely(x)    __builtin_expect(!!(x), 0)
                                               ^
   In file included from lib/mpi/generic_mpih-mul1.c:29:
   In file included from lib/mpi/mpi-internal.h:33:
   In file included from include/linux/module.h:10:
   In file included from include/linux/stat.h:19:
   In file included from include/linux/time.h:6:
   In file included from include/linux/seqlock.h:36:
   In file included from include/linux/spinlock.h:88:
   In file included from arch/mips/include/asm/spinlock.h:13:
   In file included from ./arch/mips/include/generated/asm/qrwlock.h:1:
   include/asm-generic/qrwlock.h:75:36: warning: comparison of integers of different
signs: 'int' and 'u32' (aka 'unsigned int') [-Wsign-compare]
                                                cnts, cnts | _QW_LOCKED) == cnts);
                                                ~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~
   include/linux/compiler.h:76:40: note: expanded from macro 'likely'
   # define likely(x)      __builtin_expect(!!(x), 1)
                                               ^
   In file included from lib/mpi/generic_mpih-mul1.c:29:
   In file included from lib/mpi/mpi-internal.h:33:
   In file included from include/linux/module.h:13:
   In file included from include/linux/kmod.h:22:
   In file included from include/linux/umh.h:4:
   In file included from include/linux/gfp.h:6:
   include/linux/mmzone.h:984:44: warning: comparison of integers of different signs:
'int' and 'enum zone_type' [-Wsign-compare]
           if (likely(!nodes && zonelist_zone_idx(z) <= highest_zoneidx))
                                ~~~~~~~~~~~~~~~~~~~~ ^  ~~~~~~~~~~~~~~~
   include/linux/compiler.h:76:40: note: expanded from macro 'likely'
   # define likely(x)      __builtin_expect(!!(x), 1)
                                               ^
   In file included from lib/mpi/generic_mpih-mul1.c:29:
   In file included from lib/mpi/mpi-internal.h:37:
   In file included from include/linux/mpi.h:34:
   In file included from include/linux/scatterlist.h:8:
   In file included from include/linux/mm.h:26:
   In file included from include/linux/page_ref.h:7:
   include/linux/page-flags.h:162:21: warning: comparison of integers of different signs:
'const unsigned long' and 'long' [-Wsign-compare]
           return page->flags == PAGE_POISON_PATTERN;
                  ~~~~~~~~~~~ ^  ~~~~~~~~~~~~~~~~~~~
   In file included from lib/mpi/generic_mpih-mul1.c:29:
   In file included from lib/mpi/mpi-internal.h:37:
   In file included from include/linux/mpi.h:34:
   In file included from include/linux/scatterlist.h:8:
   In file included from include/linux/mm.h:1154:
   include/linux/vmstat.h:221:2: warning: comparison of integers of different signs:
'int' and 'unsigned int' [-Wsign-compare]
           for_each_online_cpu(cpu)
           ^~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/cpumask.h:778:36: note: expanded from macro
'for_each_online_cpu'
   #define for_each_online_cpu(cpu)   for_each_cpu((cpu), cpu_online_mask)
                                      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/cpumask.h:243:9: note: expanded from macro 'for_each_cpu'
                   (cpu) < nr_cpu_ids;)
                    ~~~  ^ ~~~~~~~~~~
...
> lib/mpi/generic_mpih-mul1.c:50:24: error: invalid use of a cast
in a inline asm context requiring an lvalue: remove the cast or build with
-fheinous-gnu-extensions                    umul_ppmm(prod_high, prod_low,
s1_ptr[j], s2_limb);
                   ~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   lib/mpi/longlong.h:652:20: note: expanded from macro 'umul_ppmm'
           : "=l" ((USItype)(w0)), \
                   ~~~~~~~~~~^~~
...
> lib/mpi/generic_mpih-mul1.c:50:3: error: invalid output
constraint '=h' in asm                    umul_ppmm(prod_high, prod_low,
s1_ptr[j], s2_limb);
                   ^
   lib/mpi/longlong.h:653:7: note: expanded from macro 'umul_ppmm'
                "=h" ((USItype)(w1)) \
                ^
   7 warnings and 2 errors generated.
--
   In file included from lib/mpi/generic_mpih-mul2.c:29:
   In file included from lib/mpi/mpi-internal.h:33:
   In file included from include/linux/module.h:9:
   In file included from include/linux/list.h:9:
   In file included from include/linux/kernel.h:11:
   In file included from include/linux/bitops.h:19:
   In file included from arch/mips/include/asm/bitops.h:19:
   In file included from arch/mips/include/uapi/asm/byteorder.h:15:
   In file included from include/linux/byteorder/little_endian.h:11:
   include/linux/byteorder/generic.h:195:16: warning: comparison of integers of different
signs: 'int' and 'size_t' (aka 'unsigned int') [-Wsign-compare]
           for (i = 0; i < len; i++)
                       ~ ^ ~~~
   include/linux/byteorder/generic.h:203:16: warning: comparison of integers of different
signs: 'int' and 'size_t' (aka 'unsigned int') [-Wsign-compare]
           for (i = 0; i < len; i++)
                       ~ ^ ~~~
   In file included from lib/mpi/generic_mpih-mul2.c:29:
   In file included from lib/mpi/mpi-internal.h:33:
   In file included from include/linux/module.h:10:
   In file included from include/linux/stat.h:19:
   In file included from include/linux/time.h:6:
   In file included from include/linux/seqlock.h:36:
   In file included from include/linux/spinlock.h:51:
   In file included from include/linux/preempt.h:81:
   In file included from ./arch/mips/include/generated/asm/preempt.h:1:
   In file included from include/asm-generic/preempt.h:5:
   include/linux/thread_info.h:141:29: warning: comparison of integers of different signs:
'int' and 'size_t' (aka 'unsigned int') [-Wsign-compare]
           if (unlikely(sz >= 0 && sz < bytes)) {
                                   ~~ ^ ~~~~~
   include/linux/compiler.h:77:42: note: expanded from macro 'unlikely'
   # define unlikely(x)    __builtin_expect(!!(x), 0)
                                               ^
   In file included from lib/mpi/generic_mpih-mul2.c:29:
   In file included from lib/mpi/mpi-internal.h:33:
   In file included from include/linux/module.h:10:
   In file included from include/linux/stat.h:19:
   In file included from include/linux/time.h:6:
   In file included from include/linux/seqlock.h:36:
   In file included from include/linux/spinlock.h:88:
   In file included from arch/mips/include/asm/spinlock.h:13:
   In file included from ./arch/mips/include/generated/asm/qrwlock.h:1:
   include/asm-generic/qrwlock.h:75:36: warning: comparison of integers of different
signs: 'int' and 'u32' (aka 'unsigned int') [-Wsign-compare]
                                                cnts, cnts | _QW_LOCKED) == cnts);
                                                ~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~
   include/linux/compiler.h:76:40: note: expanded from macro 'likely'
   # define likely(x)      __builtin_expect(!!(x), 1)
                                               ^
   In file included from lib/mpi/generic_mpih-mul2.c:29:
   In file included from lib/mpi/mpi-internal.h:33:
   In file included from include/linux/module.h:13:
   In file included from include/linux/kmod.h:22:
   In file included from include/linux/umh.h:4:
   In file included from include/linux/gfp.h:6:
   include/linux/mmzone.h:984:44: warning: comparison of integers of different signs:
'int' and 'enum zone_type' [-Wsign-compare]
           if (likely(!nodes && zonelist_zone_idx(z) <= highest_zoneidx))
                                ~~~~~~~~~~~~~~~~~~~~ ^  ~~~~~~~~~~~~~~~
   include/linux/compiler.h:76:40: note: expanded from macro 'likely'
   # define likely(x)      __builtin_expect(!!(x), 1)
                                               ^
   In file included from lib/mpi/generic_mpih-mul2.c:29:
   In file included from lib/mpi/mpi-internal.h:37:
   In file included from include/linux/mpi.h:34:
   In file included from include/linux/scatterlist.h:8:
   In file included from include/linux/mm.h:26:
   In file included from include/linux/page_ref.h:7:
   include/linux/page-flags.h:162:21: warning: comparison of integers of different signs:
'const unsigned long' and 'long' [-Wsign-compare]
           return page->flags == PAGE_POISON_PATTERN;
                  ~~~~~~~~~~~ ^  ~~~~~~~~~~~~~~~~~~~
   In file included from lib/mpi/generic_mpih-mul2.c:29:
   In file included from lib/mpi/mpi-internal.h:37:
   In file included from include/linux/mpi.h:34:
   In file included from include/linux/scatterlist.h:8:
   In file included from include/linux/mm.h:1154:
   include/linux/vmstat.h:221:2: warning: comparison of integers of different signs:
'int' and 'unsigned int' [-Wsign-compare]
           for_each_online_cpu(cpu)
           ^~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/cpumask.h:778:36: note: expanded from macro
'for_each_online_cpu'
   #define for_each_online_cpu(cpu)   for_each_cpu((cpu), cpu_online_mask)
                                      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/cpumask.h:243:9: note: expanded from macro 'for_each_cpu'
                   (cpu) < nr_cpu_ids;)
                    ~~~  ^ ~~~~~~~~~~
...
> lib/mpi/generic_mpih-mul2.c:49:24: error: invalid use of a cast
in a inline asm context requiring an lvalue: remove the cast or build with
-fheinous-gnu-extensions                    umul_ppmm(prod_high, prod_low,
s1_ptr[j], s2_limb);
                   ~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   lib/mpi/longlong.h:652:20: note: expanded from macro 'umul_ppmm'
           : "=l" ((USItype)(w0)), \
                   ~~~~~~~~~~^~~
...
> lib/mpi/generic_mpih-mul2.c:49:3: error: invalid output
constraint '=h' in asm                    umul_ppmm(prod_high, prod_low,
s1_ptr[j], s2_limb);
                   ^
   lib/mpi/longlong.h:653:7: note: expanded from macro 'umul_ppmm'
                "=h" ((USItype)(w1)) \
                ^
   7 warnings and 2 errors generated.
--
   In file included from lib/mpi/generic_mpih-mul3.c:29:
   In file included from lib/mpi/mpi-internal.h:33:
   In file included from include/linux/module.h:9:
   In file included from include/linux/list.h:9:
   In file included from include/linux/kernel.h:11:
   In file included from include/linux/bitops.h:19:
   In file included from arch/mips/include/asm/bitops.h:19:
   In file included from arch/mips/include/uapi/asm/byteorder.h:15:
   In file included from include/linux/byteorder/little_endian.h:11:
   include/linux/byteorder/generic.h:195:16: warning: comparison of integers of different
signs: 'int' and 'size_t' (aka 'unsigned int') [-Wsign-compare]
           for (i = 0; i < len; i++)
                       ~ ^ ~~~
   include/linux/byteorder/generic.h:203:16: warning: comparison of integers of different
signs: 'int' and 'size_t' (aka 'unsigned int') [-Wsign-compare]
           for (i = 0; i < len; i++)
                       ~ ^ ~~~
   In file included from lib/mpi/generic_mpih-mul3.c:29:
   In file included from lib/mpi/mpi-internal.h:33:
   In file included from include/linux/module.h:10:
   In file included from include/linux/stat.h:19:
   In file included from include/linux/time.h:6:
   In file included from include/linux/seqlock.h:36:
   In file included from include/linux/spinlock.h:51:
   In file included from include/linux/preempt.h:81:
   In file included from ./arch/mips/include/generated/asm/preempt.h:1:
   In file included from include/asm-generic/preempt.h:5:
   include/linux/thread_info.h:141:29: warning: comparison of integers of different signs:
'int' and 'size_t' (aka 'unsigned int') [-Wsign-compare]
           if (unlikely(sz >= 0 && sz < bytes)) {
                                   ~~ ^ ~~~~~
   include/linux/compiler.h:77:42: note: expanded from macro 'unlikely'
   # define unlikely(x)    __builtin_expect(!!(x), 0)
                                               ^
   In file included from lib/mpi/generic_mpih-mul3.c:29:
   In file included from lib/mpi/mpi-internal.h:33:
   In file included from include/linux/module.h:10:
   In file included from include/linux/stat.h:19:
   In file included from include/linux/time.h:6:
   In file included from include/linux/seqlock.h:36:
   In file included from include/linux/spinlock.h:88:
   In file included from arch/mips/include/asm/spinlock.h:13:
   In file included from ./arch/mips/include/generated/asm/qrwlock.h:1:
   include/asm-generic/qrwlock.h:75:36: warning: comparison of integers of different
signs: 'int' and 'u32' (aka 'unsigned int') [-Wsign-compare]
                                                cnts, cnts | _QW_LOCKED) == cnts);
                                                ~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~
   include/linux/compiler.h:76:40: note: expanded from macro 'likely'
   # define likely(x)      __builtin_expect(!!(x), 1)
                                               ^
   In file included from lib/mpi/generic_mpih-mul3.c:29:
   In file included from lib/mpi/mpi-internal.h:33:
   In file included from include/linux/module.h:13:
   In file included from include/linux/kmod.h:22:
   In file included from include/linux/umh.h:4:
   In file included from include/linux/gfp.h:6:
   include/linux/mmzone.h:984:44: warning: comparison of integers of different signs:
'int' and 'enum zone_type' [-Wsign-compare]
           if (likely(!nodes && zonelist_zone_idx(z) <= highest_zoneidx))
                                ~~~~~~~~~~~~~~~~~~~~ ^  ~~~~~~~~~~~~~~~
   include/linux/compiler.h:76:40: note: expanded from macro 'likely'
   # define likely(x)      __builtin_expect(!!(x), 1)
                                               ^
   In file included from lib/mpi/generic_mpih-mul3.c:29:
   In file included from lib/mpi/mpi-internal.h:37:
   In file included from include/linux/mpi.h:34:
   In file included from include/linux/scatterlist.h:8:
   In file included from include/linux/mm.h:26:
   In file included from include/linux/page_ref.h:7:
   include/linux/page-flags.h:162:21: warning: comparison of integers of different signs:
'const unsigned long' and 'long' [-Wsign-compare]
           return page->flags == PAGE_POISON_PATTERN;
                  ~~~~~~~~~~~ ^  ~~~~~~~~~~~~~~~~~~~
   In file included from lib/mpi/generic_mpih-mul3.c:29:
   In file included from lib/mpi/mpi-internal.h:37:
   In file included from include/linux/mpi.h:34:
   In file included from include/linux/scatterlist.h:8:
   In file included from include/linux/mm.h:1154:
   include/linux/vmstat.h:221:2: warning: comparison of integers of different signs:
'int' and 'unsigned int' [-Wsign-compare]
           for_each_online_cpu(cpu)
           ^~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/cpumask.h:778:36: note: expanded from macro
'for_each_online_cpu'
   #define for_each_online_cpu(cpu)   for_each_cpu((cpu), cpu_online_mask)
                                      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/cpumask.h:243:9: note: expanded from macro 'for_each_cpu'
                   (cpu) < nr_cpu_ids;)
                    ~~~  ^ ~~~~~~~~~~
...
> lib/mpi/generic_mpih-mul3.c:49:24: error: invalid use of a cast
in a inline asm context requiring an lvalue: remove the cast or build with
-fheinous-gnu-extensions                    umul_ppmm(prod_high, prod_low,
s1_ptr[j], s2_limb);
                   ~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   lib/mpi/longlong.h:652:20: note: expanded from macro 'umul_ppmm'
           : "=l" ((USItype)(w0)), \
                   ~~~~~~~~~~^~~
...
> lib/mpi/generic_mpih-mul3.c:49:3: error: invalid output
constraint '=h' in asm                    umul_ppmm(prod_high, prod_low,
s1_ptr[j], s2_limb);
                   ^
   lib/mpi/longlong.h:653:7: note: expanded from macro 'umul_ppmm'
                "=h" ((USItype)(w1)) \
                ^
   7 warnings and 2 errors generated.
--
   In file included from lib/mpi/mpih-div.c:30:
   In file included from lib/mpi/mpi-internal.h:33:
   In file included from include/linux/module.h:9:
   In file included from include/linux/list.h:9:
   In file included from include/linux/kernel.h:11:
   In file included from include/linux/bitops.h:19:
   In file included from arch/mips/include/asm/bitops.h:19:
   In file included from arch/mips/include/uapi/asm/byteorder.h:15:
   In file included from include/linux/byteorder/little_endian.h:11:
   include/linux/byteorder/generic.h:195:16: warning: comparison of integers of different
signs: 'int' and 'size_t' (aka 'unsigned int') [-Wsign-compare]
           for (i = 0; i < len; i++)
                       ~ ^ ~~~
   include/linux/byteorder/generic.h:203:16: warning: comparison of integers of different
signs: 'int' and 'size_t' (aka 'unsigned int') [-Wsign-compare]
           for (i = 0; i < len; i++)
                       ~ ^ ~~~
   In file included from lib/mpi/mpih-div.c:30:
   In file included from lib/mpi/mpi-internal.h:33:
   In file included from include/linux/module.h:10:
   In file included from include/linux/stat.h:19:
   In file included from include/linux/time.h:6:
   In file included from include/linux/seqlock.h:36:
   In file included from include/linux/spinlock.h:51:
   In file included from include/linux/preempt.h:81:
   In file included from ./arch/mips/include/generated/asm/preempt.h:1:
   In file included from include/asm-generic/preempt.h:5:
   include/linux/thread_info.h:141:29: warning: comparison of integers of different signs:
'int' and 'size_t' (aka 'unsigned int') [-Wsign-compare]
           if (unlikely(sz >= 0 && sz < bytes)) {
                                   ~~ ^ ~~~~~
   include/linux/compiler.h:77:42: note: expanded from macro 'unlikely'
   # define unlikely(x)    __builtin_expect(!!(x), 0)
                                               ^
   In file included from lib/mpi/mpih-div.c:30:
   In file included from lib/mpi/mpi-internal.h:33:
   In file included from include/linux/module.h:10:
   In file included from include/linux/stat.h:19:
   In file included from include/linux/time.h:6:
   In file included from include/linux/seqlock.h:36:
   In file included from include/linux/spinlock.h:88:
   In file included from arch/mips/include/asm/spinlock.h:13:
   In file included from ./arch/mips/include/generated/asm/qrwlock.h:1:
   include/asm-generic/qrwlock.h:75:36: warning: comparison of integers of different
signs: 'int' and 'u32' (aka 'unsigned int') [-Wsign-compare]
                                                cnts, cnts | _QW_LOCKED) == cnts);
                                                ~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~
   include/linux/compiler.h:76:40: note: expanded from macro 'likely'
   # define likely(x)      __builtin_expect(!!(x), 1)
                                               ^
   In file included from lib/mpi/mpih-div.c:30:
   In file included from lib/mpi/mpi-internal.h:33:
   In file included from include/linux/module.h:13:
   In file included from include/linux/kmod.h:22:
   In file included from include/linux/umh.h:4:
   In file included from include/linux/gfp.h:6:
   include/linux/mmzone.h:984:44: warning: comparison of integers of different signs:
'int' and 'enum zone_type' [-Wsign-compare]
           if (likely(!nodes && zonelist_zone_idx(z) <= highest_zoneidx))
                                ~~~~~~~~~~~~~~~~~~~~ ^  ~~~~~~~~~~~~~~~
   include/linux/compiler.h:76:40: note: expanded from macro 'likely'
   # define likely(x)      __builtin_expect(!!(x), 1)
                                               ^
   In file included from lib/mpi/mpih-div.c:30:
   In file included from lib/mpi/mpi-internal.h:37:
   In file included from include/linux/mpi.h:34:
   In file included from include/linux/scatterlist.h:8:
   In file included from include/linux/mm.h:26:
   In file included from include/linux/page_ref.h:7:
   include/linux/page-flags.h:162:21: warning: comparison of integers of different signs:
'const unsigned long' and 'long' [-Wsign-compare]
           return page->flags == PAGE_POISON_PATTERN;
                  ~~~~~~~~~~~ ^  ~~~~~~~~~~~~~~~~~~~
   In file included from lib/mpi/mpih-div.c:30:
   In file included from lib/mpi/mpi-internal.h:37:
   In file included from include/linux/mpi.h:34:
   In file included from include/linux/scatterlist.h:8:
   In file included from include/linux/mm.h:1154:
   include/linux/vmstat.h:221:2: warning: comparison of integers of different signs:
'int' and 'unsigned int' [-Wsign-compare]
           for_each_online_cpu(cpu)
           ^~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/cpumask.h:778:36: note: expanded from macro
'for_each_online_cpu'
   #define for_each_online_cpu(cpu)   for_each_cpu((cpu), cpu_online_mask)
                                      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/cpumask.h:243:9: note: expanded from macro 'for_each_cpu'
                   (cpu) < nr_cpu_ids;)
                    ~~~  ^ ~~~~~~~~~~
...
> lib/mpi/mpih-div.c:142:20: error: invalid use of a cast in a
inline asm context requiring an lvalue: remove the cast or build with
-fheinous-gnu-extensions                                            umul_ppmm(n1,
n0, d0, q);
                                           ~~~~~~~~~~~~~~^~~~~~~~~~
   lib/mpi/longlong.h:652:20: note: expanded from macro 'umul_ppmm'
           : "=l" ((USItype)(w0)), \
                   ~~~~~~~~~~^~~
...
> lib/mpi/mpih-div.c:142:6: error: invalid output constraint
'=h' in asm                                            umul_ppmm(n1, n0, d0,
q);
                                           ^
   lib/mpi/longlong.h:653:7: note: expanded from macro 'umul_ppmm'
                "=h" ((USItype)(w1)) \
                ^
   lib/mpi/mpih-div.c:205:20: error: invalid use of a cast in a inline asm context
requiring an lvalue: remove the cast or build with -fheinous-gnu-extensions
                                           umul_ppmm(n1, n0, d1, q);
                                           ~~~~~~~~~~~~~~^~~~~~~~~~
   lib/mpi/longlong.h:652:20: note: expanded from macro 'umul_ppmm'
           : "=l" ((USItype)(w0)), \
                   ~~~~~~~~~~^~~
   lib/mpi/mpih-div.c:205:6: error: invalid output constraint '=h' in asm
                                           umul_ppmm(n1, n0, d1, q);
                                           ^
   lib/mpi/longlong.h:653:7: note: expanded from macro 'umul_ppmm'
                "=h" ((USItype)(w1)) \
                ^
   7 warnings and 4 errors generated.

vim +50 lib/mpi/generic_mpih-mul1.c

cdec9cb5167ab1 Dmitry Kasatkin 2011-08-31  31  
cdec9cb5167ab1 Dmitry Kasatkin 2011-08-31  32  mpi_limb_t
cdec9cb5167ab1 Dmitry Kasatkin 2011-08-31  33  mpihelp_mul_1(mpi_ptr_t res_ptr, mpi_ptr_t
s1_ptr, mpi_size_t s1_size,
cdec9cb5167ab1 Dmitry Kasatkin 2011-08-31  34  	      mpi_limb_t s2_limb)
cdec9cb5167ab1 Dmitry Kasatkin 2011-08-31  35  {
cdec9cb5167ab1 Dmitry Kasatkin 2011-08-31  36  	mpi_limb_t cy_limb;
cdec9cb5167ab1 Dmitry Kasatkin 2011-08-31  37  	mpi_size_t j;
cdec9cb5167ab1 Dmitry Kasatkin 2011-08-31  38  	mpi_limb_t prod_high, prod_low;
cdec9cb5167ab1 Dmitry Kasatkin 2011-08-31  39  
cdec9cb5167ab1 Dmitry Kasatkin 2011-08-31  40  	/* The loop counter and index J goes from
-S1_SIZE to -1.  This way
cdec9cb5167ab1 Dmitry Kasatkin 2011-08-31  41  	 * the loop becomes faster.  */
cdec9cb5167ab1 Dmitry Kasatkin 2011-08-31  42  	j = -s1_size;
cdec9cb5167ab1 Dmitry Kasatkin 2011-08-31  43  
cdec9cb5167ab1 Dmitry Kasatkin 2011-08-31  44  	/* Offset the base pointers to compensate
for the negative indices.  */
cdec9cb5167ab1 Dmitry Kasatkin 2011-08-31  45  	s1_ptr -= j;
cdec9cb5167ab1 Dmitry Kasatkin 2011-08-31  46  	res_ptr -= j;
cdec9cb5167ab1 Dmitry Kasatkin 2011-08-31  47  
cdec9cb5167ab1 Dmitry Kasatkin 2011-08-31  48  	cy_limb = 0;
cdec9cb5167ab1 Dmitry Kasatkin 2011-08-31  49  	do {
cdec9cb5167ab1 Dmitry Kasatkin 2011-08-31 @50  		umul_ppmm(prod_high, prod_low, s1_ptr[j],
s2_limb);

:::::: The code at line 50 was first introduced by commit
:::::: cdec9cb5167ab1113ba9c58e395f664d9d3f9acb crypto: GnuPG based MPI lib - source files
(part 1)

:::::: TO: Dmitry Kasatkin <dmitry.kasatkin(a)intel.com&gt;
:::::: CC: Dmitry Kasatkin <dmitry.kasatkin(a)intel.com&gt;

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