[PATCH] D72222: [Driver][CodeGen] Add -fpatchable-function-entry=N[,0]

[Nick Desaulniers via Phabricator via cfe-commits]

nickdesaulniers added a comment.

In D72222#1837184 <https://reviews.llvm.org/D72222#1837184>, @MaskRay wrote:

> @peter.smith The build was smooth. Do I need other options to reproduce?


I was able to reproduce:

  $ git clone --depth 1 git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
  $ cd linux-next
  $ ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- make CC=clang -j71 allyesconfig
  $ ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- make CC=clang -j71 mm/kasan/quarantine.o

The exact compiler invocation (via tacking on `V=1` to the above `make` command is:

  $ clang -Wp,-MD,mm/kasan/.quarantine.o.d  -nostdinc -isystem /android0/llvm-project/llvm/build/lib/clang/11.0.0/include -I./arch/arm64/include -I./arch/arm64/include/generated  -I./include -I./arch/arm64/include/uapi -I./arch/arm64/include/generated/uapi -I./include/uapi -I./include/generated/uapi -include ./include/linux/kconfig.h -include ./include/linux/compiler_types.h -D__KERNEL__ -mlittle-endian -DCC_USING_PATCHABLE_FUNCTION_ENTRY -DKASAN_SHADOW_SCALE_SHIFT=3 -Qunused-arguments -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE -Werror=implicit-function-declaration -Werror=implicit-int -Wno-format-security -std=gnu89 --target=aarch64-linux-gnu --prefix=/usr/bin/ --gcc-toolchain=/usr -no-integrated-as -Werror=unknown-warning-option -mgeneral-regs-only -DCONFIG_CC_HAS_K_CONSTRAINT=1 -fno-asynchronous-unwind-tables -DKASAN_SHADOW_SCALE_SHIFT=3 -fno-delete-null-pointer-checks -Wno-address-of-packed-member -O2 -Wframe-larger-than=2048 -fstack-protector-strong -Wno-format-invalid-specifier -Wno-gnu -Wno-tautological-compare -mno-global-merge -Wno-unused-const-variable -fno-omit-frame-pointer -fno-optimize-sibling-calls -ftrivial-auto-var-init=pattern -fpatchable-function-entry=2 -Wdeclaration-after-statement -Wvla -Wno-pointer-sign -fno-strict-overflow -fno-merge-all-constants -fno-stack-check -Werror=date-time -Werror=incompatible-pointer-types -fmacro-prefix-map=./= -Wno-initializer-overrides -Wno-format -Wno-sign-compare -Wno-format-zero-length   -fno-builtin      -DKBUILD_MODFILE='"mm/kasan/quarantine"' -DKBUILD_BASENAME='"quarantine"' -DKBUILD_MODNAME='"quarantine"' -c -o mm/kasan/quarantine.o mm/kasan/quarantine.c

creduce spits out:

  // $ clang -O2 quarantine.i
  __attribute__((patchable_function_entry(0))) a() {
    b(({
      c:
        &&c;
    }));
  }


Repository:
  rG LLVM Github Monorepo

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  https://reviews.llvm.org/D72222/new/

https://reviews.llvm.org/D72222