On Sat, Oct 15, 2022 at 12:18:57PM +0100, Conor Dooley wrote: > From: Aurelien Jarno <aurelien@xxxxxxxxxxx> > > commit 6df2a016c0c8a3d0933ef33dd192ea6606b115e3 upstream. > > >From version 2.38, binutils default to ISA spec version 20191213. This > means that the csr read/write (csrr*/csrw*) instructions and fence.i > instruction has separated from the `I` extension, become two standalone > extensions: Zicsr and Zifencei. As the kernel uses those instruction, > this causes the following build failure: > > CC arch/riscv/kernel/vdso/vgettimeofday.o > <<BUILDDIR>>/arch/riscv/include/asm/vdso/gettimeofday.h: Assembler messages: > <<BUILDDIR>>/arch/riscv/include/asm/vdso/gettimeofday.h:71: Error: unrecognized opcode `csrr a5,0xc01' > <<BUILDDIR>>/arch/riscv/include/asm/vdso/gettimeofday.h:71: Error: unrecognized opcode `csrr a5,0xc01' > <<BUILDDIR>>/arch/riscv/include/asm/vdso/gettimeofday.h:71: Error: unrecognized opcode `csrr a5,0xc01' > <<BUILDDIR>>/arch/riscv/include/asm/vdso/gettimeofday.h:71: Error: unrecognized opcode `csrr a5,0xc01' > > The fix is to specify those extensions explicitly in -march. However as > older binutils version do not support this, we first need to detect > that. > > Signed-off-by: Aurelien Jarno <aurelien@xxxxxxxxxxx> > Tested-by: Alexandre Ghiti <alexandre.ghiti@xxxxxxxxxxxxx> > Cc: stable@xxxxxxxxxxxxxxx > Signed-off-by: Palmer Dabbelt <palmer@xxxxxxxxxxxx> > [Conor: converted to the 4.19 style of march string generation] > Signed-off-by: Conor Dooley <conor.dooley@xxxxxxxxxxxxx> > --- > CC: Palmer Dabbelt <palmer@xxxxxxxxxxx> > CC: linux-riscv@xxxxxxxxxxxxxxxxxxx > CC: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> > > lkp has yet to complain, so here you go Greg.. Now queued up, thanks. greg k-h
