# git rev-parse -q --verify 90e603ca59646651c0f13d54d7b2b0c630c96998^{commit}
90e603ca59646651c0f13d54d7b2b0c630c96998
already have revision, skipping fetch
# git checkout -q -f -B kisskb 90e603ca59646651c0f13d54d7b2b0c630c96998
# git clean -qxdf
# < git log -1
# commit 90e603ca59646651c0f13d54d7b2b0c630c96998
# Author: Christophe Leroy <christophe.leroy@csgroup.eu>
# Date:   Mon Oct 19 10:13:39 2020 +0000
# 
#     powerpc/uaccess: Don't use "m<>" constraint with GCC 4.9
#     
#     GCC 4.9 sometimes fails to build with "m<>" constraint in
#     inline assembly.
#     
#       CC      lib/iov_iter.o
#     In file included from ./arch/powerpc/include/asm/cmpxchg.h:6:0,
#                      from ./arch/powerpc/include/asm/atomic.h:11,
#                      from ./include/linux/atomic.h:7,
#                      from ./include/linux/crypto.h:15,
#                      from ./include/crypto/hash.h:11,
#                      from lib/iov_iter.c:2:
#     lib/iov_iter.c: In function 'iovec_from_user.part.30':
#     ./arch/powerpc/include/asm/uaccess.h:287:2: error: 'asm' operand has impossible constraints
#       __asm__ __volatile__(    \
#       ^
#     ./include/linux/compiler.h:78:42: note: in definition of macro 'unlikely'
#      # define unlikely(x) __builtin_expect(!!(x), 0)
#                                               ^
#     ./arch/powerpc/include/asm/uaccess.h:583:34: note: in expansion of macro 'unsafe_op_wrap'
#      #define unsafe_get_user(x, p, e) unsafe_op_wrap(__get_user_allowed(x, p), e)
#                                       ^
#     ./arch/powerpc/include/asm/uaccess.h:329:10: note: in expansion of macro '__get_user_asm'
#       case 4: __get_user_asm(x, (u32 __user *)ptr, retval, "lwz"); break; \
#               ^
#     ./arch/powerpc/include/asm/uaccess.h:363:3: note: in expansion of macro '__get_user_size_allowed'
#        __get_user_size_allowed(__gu_val, __gu_addr, __gu_size, __gu_err); \
#        ^
#     ./arch/powerpc/include/asm/uaccess.h:100:2: note: in expansion of macro '__get_user_nocheck'
#       __get_user_nocheck((x), (ptr), sizeof(*(ptr)), false)
#       ^
#     ./arch/powerpc/include/asm/uaccess.h:583:49: note: in expansion of macro '__get_user_allowed'
#      #define unsafe_get_user(x, p, e) unsafe_op_wrap(__get_user_allowed(x, p), e)
#                                                      ^
#     lib/iov_iter.c:1663:3: note: in expansion of macro 'unsafe_get_user'
#        unsafe_get_user(len, &uiov[i].iov_len, uaccess_end);
#        ^
#     make[1]: *** [scripts/Makefile.build:283: lib/iov_iter.o] Error 1
#     
#     Define a UPD_CONSTR macro that is "<>" by default and
#     only "" with GCC prior to GCC 5.
#     
#     Fixes: fcf1f26895a4 ("powerpc/uaccess: Add pre-update addressing to __put_user_asm_goto()")
#     Fixes: 2f279eeb68b8 ("powerpc/uaccess: Add pre-update addressing to __get_user_asm() and __put_user_asm()")
#     Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
#     Acked-by: Segher Boessenkool <segher@kernel.crashing.org>
#     ---
#     v2: Moved UPD_CONSTR to asm-const.h to avoid circular inclusion issues with patch 3.
# < /opt/cross/kisskb/korg/gcc-4.9.4-nolibc/ia64-linux/bin/ia64-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-4.9.4-nolibc/ia64-linux/bin/ia64-linux-ld --version
# < git log --format=%s --max-count=1 90e603ca59646651c0f13d54d7b2b0c630c96998
# < make -s -j 120 ARCH=ia64 O=/kisskb/build/chleroy_ia64-defconfig_ia64-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/ia64-linux/bin/ia64-linux-  defconfig
arch/ia64/configs/generic_defconfig:58:warning: override: reassigning to symbol ATA
arch/ia64/configs/generic_defconfig:59:warning: override: reassigning to symbol ATA_PIIX
# make -s -j 120 ARCH=ia64 O=/kisskb/build/chleroy_ia64-defconfig_ia64-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/ia64-linux/bin/ia64-linux-  
<stdin>:1511:2: warning: #warning syscall clone3 not implemented [-Wcpp]
In file included from /kisskb/src/arch/ia64/include/uapi/asm/intrinsics.h:22:0,
                 from /kisskb/src/arch/ia64/include/asm/intrinsics.h:11,
                 from /kisskb/src/arch/ia64/include/asm/timex.h:14,
                 from /kisskb/src/include/linux/timex.h:65,
                 from /kisskb/src/include/linux/time32.h:13,
                 from /kisskb/src/include/linux/time.h:73,
                 from /kisskb/src/fs/nfs/read.c:11:
/kisskb/src/fs/nfs/read.c: In function 'nfs_read_completion':
/kisskb/src/arch/ia64/include/uapi/asm/cmpxchg.h:57:2: warning: value computed is not used [-Wunused-value]
 ((__typeof__(*(ptr))) __xchg((unsigned long) (x), (ptr), sizeof(*(ptr))))
  ^
/kisskb/src/fs/nfs/read.c:196:5: note: in expansion of macro 'xchg'
     xchg(&nfs_req_openctx(req)->error, error);
     ^
/kisskb/src/fs/nfs/read.c: In function 'nfs_readpage':
/kisskb/src/arch/ia64/include/uapi/asm/cmpxchg.h:57:2: warning: value computed is not used [-Wunused-value]
 ((__typeof__(*(ptr))) __xchg((unsigned long) (x), (ptr), sizeof(*(ptr))))
  ^
/kisskb/src/fs/nfs/read.c:355:2: note: in expansion of macro 'xchg'
  xchg(&ctx->error, 0);
  ^
No errors detected in 22160 functions.
Completed OK
# rm -rf /kisskb/build/chleroy_ia64-defconfig_ia64-gcc4.9
# Build took: 0:01:21.285076