Commit fe663df7 authored by Anders Roxell's avatar Anders Roxell Committed by Michael Ellerman

powerpc/lib/sstep: fix 'ptesync' build error

Building tinyconfig with gcc (Debian 11.2.0-16) and assembler (Debian
2.37.90.20220207) the following build error shows up:

  {standard input}: Assembler messages:
  {standard input}:2088: Error: unrecognized opcode: `ptesync'
  make[3]: *** [/builds/linux/scripts/Makefile.build:287: arch/powerpc/lib/sstep.o] Error 1

Add the 'ifdef CONFIG_PPC64' around the 'ptesync' in function
'emulate_update_regs()' to like it is in 'analyse_instr()'. Since it looks like
it got dropped inadvertently by commit 3cdfcbfd ("powerpc: Change
analyse_instr so it doesn't modify *regs").

A key detail is that analyse_instr() will never recognise lwsync or
ptesync on 32-bit (because of the existing ifdef), and as a result
emulate_update_regs() should never be called with an op specifying
either of those on 32-bit. So removing them from emulate_update_regs()
should be a nop in terms of runtime behaviour.

Fixes: 3cdfcbfd ("powerpc: Change analyse_instr so it doesn't modify *regs")
Cc: stable@vger.kernel.org # v4.14+
Suggested-by: default avatarArnd Bergmann <arnd@arndb.de>
Signed-off-by: default avatarAnders Roxell <anders.roxell@linaro.org>
[mpe: Add last paragraph of change log mentioning analyse_instr() details]
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220211005113.1361436-1-anders.roxell@linaro.org
parent 9bb162fa
......@@ -3264,12 +3264,14 @@ void emulate_update_regs(struct pt_regs *regs, struct instruction_op *op)
case BARRIER_EIEIO:
eieio();
break;
#ifdef CONFIG_PPC64
case BARRIER_LWSYNC:
asm volatile("lwsync" : : : "memory");
break;
case BARRIER_PTESYNC:
asm volatile("ptesync" : : : "memory");
break;
#endif
}
break;
......
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