# git rev-parse -q --verify abc3fce76adbdfa8f87272c784b388cd20b46049^{commit}
abc3fce76adbdfa8f87272c784b388cd20b46049
already have revision, skipping fetch
# git checkout -q -f -B kisskb abc3fce76adbdfa8f87272c784b388cd20b46049
# git clean -qxdf
# < git log -1
# commit abc3fce76adbdfa8f87272c784b388cd20b46049
# Author: Nicholas Piggin <npiggin@gmail.com>
# Date:   Thu Apr 2 22:04:01 2020 +1000
# 
#     Revert "powerpc/64: irq_work avoid interrupt when called with hardware irqs enabled"
#     
#     This reverts commit ebb37cf3ffd39fdb6ec5b07111f8bb2f11d92c5f.
#     
#     That commit does not play well with soft-masked irq state
#     manipulations in idle, interrupt replay, and possibly others due to
#     tracing code sometimes using irq_work_queue (e.g., in
#     trace_hardirqs_on()). That can cause PACA_IRQ_DEC to become set when
#     it is not expected, and be ignored or cleared or cause warnings.
#     
#     The net result seems to be missing an irq_work until the next timer
#     interrupt in the worst case which is usually not going to be noticed,
#     however it could be a long time if the tick is disabled, which is
#     against the spirit of irq_work and might cause real problems.
#     
#     The idea is still solid, but it would need more work. It's not really
#     clear if it would be worth added complexity, so revert this for
#     now (not a straight revert, but replace with a comment explaining why
#     we might see interrupts happening, and gives git blame something to
#     find).
#     
#     Fixes: ebb37cf3ffd3 ("powerpc/64: irq_work avoid interrupt when called with hardware irqs enabled")
#     Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
#     Link: https://lore.kernel.org/r/20200402120401.1115883-1-npiggin@gmail.com
# < /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 abc3fce76adbdfa8f87272c784b388cd20b46049
# < make -s -j 80 ARCH=ia64 O=/kisskb/build/powerpc-next_ia64-defconfig_ia64-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/ia64-linux/bin/ia64-linux-  defconfig
# < make -s -j 80 ARCH=ia64 O=/kisskb/build/powerpc-next_ia64-defconfig_ia64-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/ia64-linux/bin/ia64-linux-  help
# make -s -j 80 ARCH=ia64 O=/kisskb/build/powerpc-next_ia64-defconfig_ia64-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/ia64-linux/bin/ia64-linux-  olddefconfig
# make -s -j 80 ARCH=ia64 O=/kisskb/build/powerpc-next_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/bitops.h:19,
                 from /kisskb/src/include/linux/bitops.h:29,
                 from /kisskb/src/include/linux/kernel.h:12,
                 from /kisskb/src/include/linux/list.h:9,
                 from /kisskb/src/include/linux/preempt.h:11,
                 from /kisskb/src/include/linux/spinlock.h:51,
                 from /kisskb/src/include/linux/seqlock.h:36,
                 from /kisskb/src/include/linux/time.h:6,
                 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:353:2: note: in expansion of macro 'xchg'
  xchg(&ctx->error, 0);
  ^
/kisskb/src/drivers/gpu/drm/drm_dp_mst_topology.c: In function 'drm_dp_mst_dsc_aux_for_port':
/kisskb/src/drivers/gpu/drm/drm_dp_mst_topology.c:5400:9: warning: missing braces around initializer [-Wmissing-braces]
  struct drm_dp_desc desc = { 0 };
         ^
/kisskb/src/drivers/gpu/drm/drm_dp_mst_topology.c:5400:9: warning: (near initialization for 'desc.ident') [-Wmissing-braces]
No errors detected in 21897 functions.
Completed OK
# rm -rf /kisskb/build/powerpc-next_ia64-defconfig_ia64-gcc4.9
# Build took: 0:02:14.179823