# git rev-parse -q --verify 4356e9f841f7fbb945521cef3577ba394c65f3fc^{commit}
4356e9f841f7fbb945521cef3577ba394c65f3fc
already have revision, skipping fetch
# git checkout -q -f -B kisskb 4356e9f841f7fbb945521cef3577ba394c65f3fc
# git clean -qxdf
# < git log -1
# commit 4356e9f841f7fbb945521cef3577ba394c65f3fc
# Author: Linus Torvalds <torvalds@linux-foundation.org>
# Date:   Fri Feb 9 12:39:31 2024 -0800
# 
#     work around gcc bugs with 'asm goto' with outputs
#     
#     We've had issues with gcc and 'asm goto' before, and we created a
#     'asm_volatile_goto()' macro for that in the past: see commits
#     3f0116c3238a ("compiler/gcc4: Add quirk for 'asm goto' miscompilation
#     bug") and a9f180345f53 ("compiler/gcc4: Make quirk for
#     asm_volatile_goto() unconditional").
#     
#     Then, much later, we ended up removing the workaround in commit
#     43c249ea0b1e ("compiler-gcc.h: remove ancient workaround for gcc PR
#     58670") because we no longer supported building the kernel with the
#     affected gcc versions, but we left the macro uses around.
#     
#     Now, Sean Christopherson reports a new version of a very similar
#     problem, which is fixed by re-applying that ancient workaround.  But the
#     problem in question is limited to only the 'asm goto with outputs'
#     cases, so instead of re-introducing the old workaround as-is, let's
#     rename and limit the workaround to just that much less common case.
#     
#     It looks like there are at least two separate issues that all hit in
#     this area:
#     
#      (a) some versions of gcc don't mark the asm goto as 'volatile' when it
#          has outputs:
#     
#             https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98619
#             https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110420
#     
#          which is easy to work around by just adding the 'volatile' by hand.
#     
#      (b) Internal compiler errors:
#     
#             https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110422
#     
#          which are worked around by adding the extra empty 'asm' as a
#          barrier, as in the original workaround.
#     
#     but the problem Sean sees may be a third thing since it involves bad
#     code generation (not an ICE) even with the manually added 'volatile'.
#     
#     but the same old workaround works for this case, even if this feels a
#     bit like voodoo programming and may only be hiding the issue.
#     
#     Reported-and-tested-by: Sean Christopherson <seanjc@google.com>
#     Link: https://lore.kernel.org/all/20240208220604.140859-1-seanjc@google.com/
#     Cc: Nick Desaulniers <ndesaulniers@google.com>
#     Cc: Uros Bizjak <ubizjak@gmail.com>
#     Cc: Jakub Jelinek <jakub@redhat.com>
#     Cc: Andrew Pinski <quic_apinski@quicinc.com>
#     Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
# < /opt/cross/kisskb/korg/gcc-13.1.0-nolibc/sh4-linux/bin/sh4-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-13.1.0-nolibc/sh4-linux/bin/sh4-linux-ld --version
# < git log --format=%s --max-count=1 4356e9f841f7fbb945521cef3577ba394c65f3fc
# make -s -j 160 ARCH=sh O=/kisskb/build/linus_allmodconfig_sh4-gcc13 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-13.1.0-nolibc/sh4-linux/bin/sh4-linux-  allmodconfig
# Added to kconfig CONFIG_BUILD_DOCSRC=n
# Added to kconfig CONFIG_MODULE_SIG=n
# Added to kconfig CONFIG_SAMPLES=n
# < make -s -j 160 ARCH=sh O=/kisskb/build/linus_allmodconfig_sh4-gcc13 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-13.1.0-nolibc/sh4-linux/bin/sh4-linux-  help
# make -s -j 160 ARCH=sh O=/kisskb/build/linus_allmodconfig_sh4-gcc13 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-13.1.0-nolibc/sh4-linux/bin/sh4-linux-  olddefconfig
# make -s -j 160 ARCH=sh O=/kisskb/build/linus_allmodconfig_sh4-gcc13 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-13.1.0-nolibc/sh4-linux/bin/sh4-linux-  
  Generating include/generated/machtypes.h
<stdin>:1519:2: warning: #warning syscall clone3 not implemented [-Wcpp]
/kisskb/src/arch/sh/kernel/cpu/sh2/../../entry-common.S: Assembler messages:
/kisskb/src/arch/sh/kernel/cpu/sh2/../../entry-common.S:85: Warning: overflow in branch to __restore_all; converted into longer instruction sequence
/kisskb/src/arch/sh/kernel/cpu/sh2/../../entry-common.S:357: Warning: overflow in branch to syscall_exit_work; converted into longer instruction sequence
/kisskb/src/arch/sh/kernel/cpu/sh2/../../entry-common.S:360: Warning: overflow in branch to syscall_exit_work; converted into longer instruction sequence
/kisskb/src/arch/sh/math-emu/math.c:492:5: error: no previous prototype for 'do_fpu_inst' [-Werror=missing-prototypes]
  492 | int do_fpu_inst(unsigned short inst, struct pt_regs *regs)
      |     ^~~~~~~~~~~
/kisskb/src/arch/sh/mm/cache-sh2.c:85:13: error: no previous prototype for 'sh2_cache_init' [-Werror=missing-prototypes]
   85 | void __init sh2_cache_init(void)
      |             ^~~~~~~~~~~~~~
cc1: all warnings being treated as errors
make[5]: *** [/kisskb/src/scripts/Makefile.build:243: arch/sh/mm/cache-sh2.o] Error 1
make[5]: *** Waiting for unfinished jobs....
/kisskb/src/arch/sh/mm/nommu.c:76:13: error: no previous prototype for 'kmap_coherent_init' [-Werror=missing-prototypes]
   76 | void __init kmap_coherent_init(void)
      |             ^~~~~~~~~~~~~~~~~~
/kisskb/src/arch/sh/mm/nommu.c:80:7: error: no previous prototype for 'kmap_coherent' [-Werror=missing-prototypes]
   80 | void *kmap_coherent(struct page *page, unsigned long addr)
      |       ^~~~~~~~~~~~~
/kisskb/src/arch/sh/mm/nommu.c:86:6: error: no previous prototype for 'kunmap_coherent' [-Werror=missing-prototypes]
   86 | void kunmap_coherent(void *kvaddr)
      |      ^~~~~~~~~~~~~~~
cc1: all warnings being treated as errors
make[5]: *** [/kisskb/src/scripts/Makefile.build:243: arch/sh/mm/nommu.o] Error 1
make[4]: *** [/kisskb/src/scripts/Makefile.build:481: arch/sh/mm] Error 2
make[4]: *** Waiting for unfinished jobs....
cc1: all warnings being treated as errors
make[5]: *** [/kisskb/src/scripts/Makefile.build:243: arch/sh/math-emu/math.o] Error 1
make[4]: *** [/kisskb/src/scripts/Makefile.build:481: arch/sh/math-emu] Error 2
/kisskb/src/arch/sh/kernel/cpu/init.c:99:29: error: no previous prototype for 'l2_cache_init' [-Werror=missing-prototypes]
   99 | void __attribute__ ((weak)) l2_cache_init(void)
      |                             ^~~~~~~~~~~~~
cc1: all warnings being treated as errors
make[6]: *** [/kisskb/src/scripts/Makefile.build:243: arch/sh/kernel/cpu/init.o] Error 1
make[5]: *** [/kisskb/src/scripts/Makefile.build:481: arch/sh/kernel/cpu] Error 2
make[5]: *** Waiting for unfinished jobs....
make[4]: *** [/kisskb/src/scripts/Makefile.build:481: arch/sh/kernel] Error 2
make[3]: *** [/kisskb/src/scripts/Makefile.build:481: arch/sh] Error 2
make[3]: *** Waiting for unfinished jobs....
{standard input}: Assembler messages:
{standard input}:1094: Warning: end of file not at end of a line; newline inserted
{standard input}:1095: Error: expected symbol name
sh4-linux-gcc: internal compiler error: Segmentation fault signal terminated program cc1
Please submit a full bug report, with preprocessed source (by using -freport-bug).
See <https://gcc.gnu.org/bugs/> for instructions.
make[6]: *** [/kisskb/src/scripts/Makefile.build:243: drivers/net/pcs/pcs-xpcs.o] Error 4
make[6]: *** Waiting for unfinished jobs....
make[5]: *** [/kisskb/src/scripts/Makefile.build:481: drivers/net/pcs] Error 2
make[5]: *** Waiting for unfinished jobs....
make[4]: *** [/kisskb/src/scripts/Makefile.build:481: drivers/net] Error 2
make[4]: *** Waiting for unfinished jobs....
make[3]: *** [/kisskb/src/scripts/Makefile.build:481: drivers] Error 2
make[2]: *** [/kisskb/src/Makefile:1921: .] Error 2
make[1]: *** [/kisskb/src/Makefile:240: __sub-make] Error 2
make: *** [Makefile:240: __sub-make] Error 2
Command 'make -s -j 160 ARCH=sh O=/kisskb/build/linus_allmodconfig_sh4-gcc13 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-13.1.0-nolibc/sh4-linux/bin/sh4-linux-  ' returned non-zero exit status 2.
# rm -rf /kisskb/build/linus_allmodconfig_sh4-gcc13
# Build took: 0:04:52.936677