# git rev-parse -q --verify 5cf0fd591f2e7833405bdc7ce2176c3502e8a11e^{commit}
5cf0fd591f2e7833405bdc7ce2176c3502e8a11e
already have revision, skipping fetch
# git checkout -q -f -B kisskb 5cf0fd591f2e7833405bdc7ce2176c3502e8a11e
# git clean -qxdf
# < git log -1
# commit 5cf0fd591f2e7833405bdc7ce2176c3502e8a11e
# Author: Linus Torvalds <torvalds@linux-foundation.org>
# Date:   Tue Feb 23 12:21:58 2021 -0800
# 
#     Kbuild: disable TRIM_UNUSED_KSYMS option
#     
#     The removal of EXPORT_UNUSED_SYMBOL() in commit 367948220fce looks like
#     (and was sold as) a no-op, but it actually had a rather serious and
#     subtle side effect: the UNUSED_SYMBOLS option not only enabled the
#     removed (unused) functionality, it also _disabled_ the TRIM_UNUSED_KSYMS
#     functionality.
#     
#     And it turns out that TRIM_UNUSED_KSYMS is a huge time waste, and takes
#     up a third of the kernel build time for me.  For no actual upside, since
#     no distro is likely to ever be able to enable it (because they all
#     support external kernel modules).
#     
#     Rather than re-enable EXPORT_UNUSED_SYMBOL, this just disables the
#     TRIM_UNUSED_KSYMS option by marking it broken.  I'm tempted to just
#     remove the support entirely, but maybe somebody has a use-case and can
#     fix the behavior of it.
#     
#     I could have just disabled it for COMPILE_TEST, but it really smells
#     like the TRIM_UNUSED_KSYMS option is badly done and not really useful,
#     so this takes the more direct approach - let's see if anybody ever
#     actually notices or complains.
#     
#     Cc: Miroslav Benes <mbenes@suse.cz>
#     Cc: Emil Velikov <emil.l.velikov@gmail.com>
#     Cc: Christoph Hellwig <hch@lst.de>
#     Cc: Jessica Yu <jeyu@kernel.org>
#     Fixes: 367948220fce ("module: remove EXPORT_UNUSED_SYMBOL*")
#     Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
# < /opt/cross/kisskb/korg/gcc-8.1.0-nolibc/nds32le-linux/bin/nds32le-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-8.1.0-nolibc/nds32le-linux/bin/nds32le-linux-ld --version
# < git log --format=%s --max-count=1 5cf0fd591f2e7833405bdc7ce2176c3502e8a11e
# < make -s -j 48 ARCH=nds32 O=/kisskb/build/linus_nds32-allmodconfig_nds32le-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/nds32le-linux/bin/nds32le-linux-  allmodconfig
# < make -s -j 48 ARCH=nds32 O=/kisskb/build/linus_nds32-allmodconfig_nds32le-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/nds32le-linux/bin/nds32le-linux-  help
# make -s -j 48 ARCH=nds32 O=/kisskb/build/linus_nds32-allmodconfig_nds32le-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/nds32le-linux/bin/nds32le-linux-  olddefconfig
# make -s -j 48 ARCH=nds32 O=/kisskb/build/linus_nds32-allmodconfig_nds32le-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/nds32le-linux/bin/nds32le-linux-  
<stdin>:1511:2: warning: #warning syscall clone3 not implemented [-Wcpp]
/kisskb/src/arch/nds32/kernel/setup.c: In function 'setup_memory':
/kisskb/src/arch/nds32/kernel/setup.c:247:26: warning: unused variable 'region' [-Wunused-variable]
  struct memblock_region *region;
                          ^~~~~~
/kisskb/src/drivers/input/joystick/analog.c:160:2: warning: #warning Precise timer not defined for this architecture. [-Wcpp]
 #warning Precise timer not defined for this architecture.
  ^~~~~~~
In file included from /kisskb/src/drivers/net/wireless/ath/ath11k/qmi.c:10:
/kisskb/src/drivers/net/wireless/ath/ath11k/qmi.c: In function 'ath11k_qmi_respond_fw_mem_request':
/kisskb/src/drivers/net/wireless/ath/ath11k/qmi.c:1690:8: warning: format '%llx' expects argument of type 'long long unsigned int', but argument 5 has type 'dma_addr_t' {aka 'unsigned int'} [-Wformat=]
        "qmi req mem_seg[%d] 0x%llx %u %u\n", i,
        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
         ab->qmi.target_mem[i].paddr,
         ~~~~~~~~~~~~~~~~~~~~~~~~~~~
/kisskb/src/drivers/net/wireless/ath/ath11k/debug.h:64:30: note: in definition of macro 'ath11k_dbg'
   __ath11k_dbg(ar, dbg_mask, fmt, ##__VA_ARGS__); \
                              ^~~
WARNING: modpost: EXPORT symbol "clear_page" [vmlinux] version generation failed, symbol will not be versioned.
WARNING: modpost: EXPORT symbol "copy_page" [vmlinux] version generation failed, symbol will not be versioned.
Completed OK
# rm -rf /kisskb/build/linus_nds32-allmodconfig_nds32le-gcc8
# Build took: 0:13:26.577658