[linux-next][bisected 1945bc45] build brakes for PowerPC BE configuration on LPAR
Nicholas Piggin
npiggin at gmail.com
Thu May 4 20:41:12 AEST 2017
On Thu, 04 May 2017 14:54:19 +0530
Abdul Haleem <abdhalee at 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 <npiggin at 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 <ego at linux.vnet.ibm.com>
> Reviewed-by: Mahesh J Salgaonkar <mahesh at linux.vnet.ibm.com>
> Signed-off-by: Nicholas Piggin <npiggin at gmail.com>
> Signed-off-by: Michael Ellerman <mpe at 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 <npiggin at 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
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