# git rev-parse -q --verify bb5a93aaf25261321db0c499cde7da6ee9d8b164^{commit}
bb5a93aaf25261321db0c499cde7da6ee9d8b164
already have revision, skipping fetch
# git checkout -q -f -B kisskb bb5a93aaf25261321db0c499cde7da6ee9d8b164
# git clean -qxdf
# < git log -1
# commit bb5a93aaf25261321db0c499cde7da6ee9d8b164
# Author: Linus Torvalds <torvalds@linux-foundation.org>
# Date:   Sun Jul 5 12:50:20 2020 -0700
# 
#     x86/ldt: use "pr_info_once()" instead of open-coding it badly
#     
#     Using a mutex for "print this warning only once" is so overdesigned as
#     to be actively offensive to my sensitive stomach.
#     
#     Just use "pr_info_once()" that already does this, although in a
#     (harmlessly) racy manner that can in theory cause the message to be
#     printed twice if more than one CPU races on that "is this the first
#     time" test.
#     
#     [ If somebody really cares about that harmless data race (which sounds
#       very unlikely indeed), that person can trivially fix printk_once() by
#       using a simple atomic access, preferably with an optimistic non-atomic
#       test first before even bothering to treat the pointless "make sure it
#       is _really_ just once" case.
#     
#       A mutex is most definitely never the right primitive to use for
#       something like this. ]
#     
#     Yes, this is a small and meaningless detail in a code path that hardly
#     matters.  But let's keep some code quality standards here, and not
#     accept outrageously bad code.
#     
#     Link: https://lore.kernel.org/lkml/CAHk-=wgV9toS7GU3KmNpj8hCS9SeF+A0voHS8F275_mgLhL4Lw@mail.gmail.com/
#     Cc: Andy Lutomirski <luto@kernel.org>
#     Cc: Thomas Gleixner <tglx@linutronix.de>
#     Cc: Peter Zijlstra (Intel) <peterz@infradead.org>
#     Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
# < /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 bb5a93aaf25261321db0c499cde7da6ee9d8b164
# < make -s -j 48 ARCH=ia64 O=/kisskb/build/linus_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 48 ARCH=ia64 O=/kisskb/build/linus_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 48 ARCH=ia64 O=/kisskb/build/linus_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 48 ARCH=ia64 O=/kisskb/build/linus_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:355:2: note: in expansion of macro 'xchg'
  xchg(&ctx->error, 0);
  ^
No errors detected in 22247 functions.
Completed OK
# rm -rf /kisskb/build/linus_ia64-defconfig_ia64-gcc4.9
# Build took: 0:02:16.529593