Clang's integrated assembler does not allow symbols with non-absolute values to be reassigned. This patch allows the affected code to be compatible with IAS.
Link: https://github.com/ClangBuiltLinux/linux/issues/1043 Reported-by: Nick Desaulniers <ndesaulni...@google.com> Reported-by: Sedat Dilek <sedat.di...@gmail.com> Suggested-by: Nick Desaulniers <ndesaulni...@google.com> Suggested-by: Brian Gerst <brge...@gmail.com> Suggested-by: Arvind Sankar <nived...@alum.mit.edu> Tested-by: Sedat Dilek <sedat.di...@gmail.com> # Compile-/Assemble-tested against Linux v5.8-rc5 with LLVM/Clang v11.0.0-git Signed-off-by: Jian Cai <caij2...@gmail.com> --- Thanks Nick and Sedat for explaining the process of submitting patches. Include the changelog as follows, Changes v1 -> v2: Update the patch based on Arvind Sankar <nived...@alum.mit.edu>'s comments. Also include addtional information in the Tested-by tag. arch/x86/include/asm/idtentry.h | 14 ++++++-------- 1 file changed, 6 insertions(+), 8 deletions(-) diff --git a/arch/x86/include/asm/idtentry.h b/arch/x86/include/asm/idtentry.h index f3d70830bf2a..5efaaed34eda 100644 --- a/arch/x86/include/asm/idtentry.h +++ b/arch/x86/include/asm/idtentry.h @@ -469,16 +469,15 @@ __visible noinstr void func(struct pt_regs *regs, \ .align 8 SYM_CODE_START(irq_entries_start) vector=FIRST_EXTERNAL_VECTOR - pos = . .rept (FIRST_SYSTEM_VECTOR - FIRST_EXTERNAL_VECTOR) UNWIND_HINT_IRET_REGS +0 : .byte 0x6a, vector jmp asm_common_interrupt nop /* Ensure that the above is 8 bytes max */ - . = pos + 8 - pos=pos+8 - vector=vector+1 + . = 0b + 8 + vector = vector+1 .endr SYM_CODE_END(irq_entries_start) @@ -486,16 +485,15 @@ SYM_CODE_END(irq_entries_start) .align 8 SYM_CODE_START(spurious_entries_start) vector=FIRST_SYSTEM_VECTOR - pos = . .rept (NR_VECTORS - FIRST_SYSTEM_VECTOR) UNWIND_HINT_IRET_REGS +0 : .byte 0x6a, vector jmp asm_spurious_interrupt nop /* Ensure that the above is 8 bytes max */ - . = pos + 8 - pos=pos+8 - vector=vector+1 + . = 0b + 8 + vector = vector+1 .endr SYM_CODE_END(spurious_entries_start) #endif -- 2.27.0.389.gc38d7665816-goog
