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Date: Wed, 24 Feb 2016 13:21:04 +0530
From: Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>
To: Torsten Duwe <duwe@....de>
Cc: Michael Ellerman <mpe@...erman.id.au>,
Petr Mladek <pmladek@...e.com>, Jessica Yu <jeyu@...hat.com>,
Jiri Kosina <jkosina@...e.cz>, linux-kernel@...r.kernel.org,
Steven Rostedt <rostedt@...dmis.org>,
live-patching@...r.kernel.org, Miroslav Benes <mbenes@...e.cz>,
linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v8 8/8] livepatch: Detect offset for the ftrace location
during build
* Torsten Duwe <duwe@....de> [2016-02-23 18:00:17]:
> On Wed, Feb 17, 2016 at 02:08:41PM +1100, Michael Ellerman wrote:
> >
> > That stub uses r2 to find the location of itself, but it only works if r2 holds
> > the TOC for scsi_mod.ko. In this case r2 still contains ibmvscsi.ko's TOC.
>
> Here's my solution, a bit rough still. This replaces the module_64.c change
> from patch 2/8:
>
> I shuffle the trampoline instructions so the R2-save-to-stack comes first.
> This allows me to construct a profiling trampoline code that
> looks very similar. The first instruction, harmful to -mprofile-kernel
> can now be replaced with a load of the *kernel* TOC value via paca.
> Arithmetic is done in r11, to keep it bitwise identical where possible.
> Likewise the result is "moved" to r12 via an addi.
>
> What do you think?
>
Hi Torsten,
I hit build failure, after replacing this patch with patch 2/8 module_64.c
hunk.
CC arch/powerpc/kernel/module.o
CC arch/powerpc/kernel/module_64.o
In file included from ./arch/powerpc/include/asm/asm-offsets.h:1:0,
from arch/powerpc/kernel/module_64.c:30:
include/generated/asm-offsets.h:14:0: error: "NMI_MASK" redefined [-Werror]
#define NMI_MASK 1048576 /* NMI_MASK # */
^
In file included from include/linux/spinlock.h:50:0,
from include/linux/seqlock.h:35,
from include/linux/time.h:5,
from include/linux/stat.h:18,
from include/linux/module.h:10,
from arch/powerpc/kernel/module_64.c:21:
include/linux/preempt.h:46:0: note: this is the location of the previous definition
#define NMI_MASK (__IRQ_MASK(NMI_BITS) << NMI_SHIFT)
^
In file included from ./arch/powerpc/include/asm/asm-offsets.h:1:0,
from arch/powerpc/kernel/module_64.c:30:
include/generated/asm-offsets.h:148:0: error: "CLONE_VM" redefined [-Werror]
#define CLONE_VM 256 /* CLONE_VM # */
^
In file included from include/linux/sched.h:4:0,
from ./arch/powerpc/include/asm/elf.h:12,
from include/linux/elf.h:4,
from include/linux/module.h:15,
from arch/powerpc/kernel/module_64.c:21:
include/uapi/linux/sched.h:8:0: note: this is the location of the previous definition
#define CLONE_VM 0x00000100 /* set if VM shared between processes */
^
In file included from ./arch/powerpc/include/asm/asm-offsets.h:1:0,
from arch/powerpc/kernel/module_64.c:30:
include/generated/asm-offsets.h:149:0: error: "CLONE_UNTRACED" redefined [-Werror]
#define CLONE_UNTRACED 8388608 /* CLONE_UNTRACED # */
^
In file included from include/linux/sched.h:4:0,
from ./arch/powerpc/include/asm/elf.h:12,
from include/linux/elf.h:4,
from include/linux/module.h:15,
from arch/powerpc/kernel/module_64.c:21:
include/uapi/linux/sched.h:22:0: note: this is the location of the previous definition
#define CLONE_UNTRACED 0x00800000 /* set if the tracing process can't force CLONE_PTRACE on this clone */
^
In file included from ./arch/powerpc/include/asm/asm-offsets.h:1:0,
from arch/powerpc/kernel/module_64.c:30:
include/generated/asm-offsets.h:185:0: error: "NSEC_PER_SEC" redefined [-Werror]
#define NSEC_PER_SEC 1000000000 /* NSEC_PER_SEC # */
^
In file included from include/linux/time.h:7:0,
from include/linux/stat.h:18,
from include/linux/module.h:10,
from arch/powerpc/kernel/module_64.c:21:
include/linux/time64.h:35:0: note: this is the location of the previous definition
#define NSEC_PER_SEC 1000000000L
^
In file included from ./arch/powerpc/include/asm/asm-offsets.h:1:0,
from arch/powerpc/kernel/module_64.c:30:
include/generated/asm-offsets.h:188:0: error: "PGD_TABLE_SIZE" redefined [-Werror]
#define PGD_TABLE_SIZE 32768 /* PGD_TABLE_SIZE # */
^
In file included from ./arch/powerpc/include/asm/book3s/64/hash.h:58:0,
from ./arch/powerpc/include/asm/book3s/64/pgtable.h:8,
from ./arch/powerpc/include/asm/mmu-hash64.h:24,
from ./arch/powerpc/include/asm/mmu.h:185,
from ./arch/powerpc/include/asm/lppaca.h:36,
from ./arch/powerpc/include/asm/paca.h:21,
from ./arch/powerpc/include/asm/hw_irq.h:42,
from ./arch/powerpc/include/asm/irqflags.h:11,
from include/linux/irqflags.h:15,
from include/linux/spinlock.h:53,
from include/linux/seqlock.h:35,
from include/linux/time.h:5,
from include/linux/stat.h:18,
from include/linux/module.h:10,
from arch/powerpc/kernel/module_64.c:21:
./arch/powerpc/include/asm/book3s/64/hash-64k.h:133:0: note: this is the location of the previous definition
#define PGD_TABLE_SIZE (sizeof(pgd_t) << PGD_INDEX_SIZE)
^
cc1: all warnings being treated as errors
scripts/Makefile.build:258: recipe for target 'arch/powerpc/kernel/module_64.o' failed
make[1]: *** [arch/powerpc/kernel/module_64.o] Error 1
Makefile:950: recipe for target 'arch/powerpc/kernel' failed
make: *** [arch/powerpc/kernel] Error 2
Thanks,
Kamalesh.
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