On Thu, 04 May 2017 14:54:19 +0530 Abdul Haleem <abdha...@linux.vnet.ibm.com> wrote:
> Hi, > > linux-next build fails on BE config with next-20170424 onwards > > the patch https://lkml.org/lkml/2017/4/20/994 fixes a similar issue > with kvm guest build failure. > > arch/powerpc/kernel/exceptions-64s.S: Assembler messages: > arch/powerpc/kernel/exceptions-64s.S:395: Error: operand out of range > (0xffffffffffff8280 is not between 0x0000000000000000 and > 0x000000000000ffff) > make[1]: *** [arch/powerpc/kernel/head_64.o] Error 1 > > Bisection resulted with the below bad commit. > > commit 1945bc4549e5cb1f9aa873ec29191aa54dc851d > Author: Nicholas Piggin <npig...@gmail.com> > Date: Wed Apr 19 23:05:47 2017 +1000 > > powerpc/64s: Fix POWER9 machine check handler from stop state > > Reviewed-by: Gautham R. Shenoy <e...@linux.vnet.ibm.com> > Reviewed-by: Mahesh J Salgaonkar <mah...@linux.vnet.ibm.com> > Signed-off-by: Nicholas Piggin <npig...@gmail.com> > Signed-off-by: Michael Ellerman <m...@ellerman.id.au> > > arch/powerpc/include/asm/reg.h | 1 + > arch/powerpc/kernel/exceptions-64s.S | 79 > ++++++++++++++++++++++++++++++++++++++++++++----------------------------------- > arch/powerpc/kernel/idle_book3s.S | 25 +++++++++++++++++++++++++ > 3 files changed, 70 insertions(+), 35 deletions(-) > > the BE configuration file is attached. > Thanks for the report. I wouldn't reproduce it with this config. I suspect the following patch should fix it, can you test? powerpc/64s: Fix unnecessary machine check handler relocation branch Similarly to 2563a70c3b ("powerpc/64s: Remove unnecessary relocation branch from idle handler"), the machine check handler has a BRANCH_TO from relocated to relocated code, which is unnecessary. It has also caused build errors with some toolchains: arch/powerpc/kernel/exceptions-64s.S: Assembler messages: arch/powerpc/kernel/exceptions-64s.S:395: Error: operand out of range (0xffffffffffff8280 is not between 0x0000000000000000 and 0x000000000000ffff) Fixes: 1945bc4549 ("powerpc/64s: Fix POWER9 machine check handler from stop state") Signed-off-by: Nicholas Piggin <npig...@gmail.com> --- arch/powerpc/kernel/exceptions-64s.S | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S index 3840a7700285..ef72065f684c 100644 --- a/arch/powerpc/kernel/exceptions-64s.S +++ b/arch/powerpc/kernel/exceptions-64s.S @@ -391,9 +391,7 @@ EXC_COMMON_BEGIN(machine_check_handle_early) */ BEGIN_FTR_SECTION rlwinm. r11,r12,47-31,30,31 - beq- 4f - BRANCH_TO_COMMON(r10, machine_check_idle_common) -4: + bne machine_check_idle_common END_FTR_SECTION_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206) #endif -- 2.11.0