Greetings!!!
I am seeing below kernel crash from 6.11.0-rc4-next-20240820.
Tried to do git bisect, but it didnt point to right patch. Attached is
the bisect log.
Any help in fixing this is much appriciated.
[ 1246.652547] WARNING: CPU: 0 PID: 45927 at kernel/sched/fair.c:6049
unthrottle_
Hi all,
On Sat, 14 Sep 2024 12:02:09 +1000 Michael Ellerman wrote:
>
> Mina Almasry writes:
> > Building net-next with powerpc with GCC 14 compiler results in this
> > build error:
> >
> > /home/sfr/next/tmp/ccuSzwiR.s: Assembler messages:
> > /home/sfr/next/tmp/ccuSzwiR.s:2579: Error: operand o
From: Naveen N Rao
Add support for bpf_arch_text_poke() and arch_prepare_bpf_trampoline()
for 64-bit powerpc. While the code is generic, BPF trampolines are only
enabled on 64-bit powerpc. 32-bit powerpc will need testing and some
updates.
BPF Trampolines adhere to the existing ftrace ABI utiliz
From: Naveen N Rao
Add powerpc 32-bit and 64-bit samples for ftrace direct. This serves to
show the sample instruction sequence to be used by ftrace direct calls
to adhere to the ftrace ABI.
On 64-bit powerpc, TOC setup requires some additional work.
Signed-off-by: Naveen N Rao
---
arch/power
From: Naveen N Rao
Add support for DYNAMIC_FTRACE_WITH_DIRECT_CALLS similar to the arm64
implementation.
ftrace direct calls allow custom trampolines to be called into directly
from function ftrace call sites, bypassing the ftrace trampoline
completely. This functionality is currently utilized b
From: Naveen N Rao
Implement support for DYNAMIC_FTRACE_WITH_CALL_OPS similar to the
arm64 implementation.
This works by patching-in a pointer to an associated ftrace_ops
structure before each traceable function. If multiple ftrace_ops are
associated with a call site, then a special ftrace_list_
From: Naveen N Rao
Function profile sequence on powerpc includes two instructions at the
beginning of each function:
mflrr0
bl ftrace_caller
The call to ftrace_caller() gets nop'ed out during kernel boot and is
patched in when ftrace is enabled.
Given the sequence, we c
From: Naveen N Rao
We are restricted to a .text size of ~32MB when using out-of-line
function profile sequence. Allow this to be extended up to the previous
limit of ~64MB by reserving space in the middle of .text.
A new config option CONFIG_PPC_FTRACE_OUT_OF_LINE_NUM_RESERVE is
introduced to sp
From: Naveen N Rao
On powerpc, we would like to be able to make a pass on vmlinux.o and
generate a new object file to be linked into vmlinux. Add a generic pass
in Makefile.vmlinux that architectures can use for this purpose.
Architectures need to select CONFIG_ARCH_WANTS_PRE_LINK_VMLINUX and mu
From: Naveen N Rao
Function tracer on powerpc can only work with vmlinux having a .text
size of up to ~64MB due to powerpc branch instruction having a limited
relative branch range of 32MB. Today, this is only detected on kernel
boot when ftrace is init'ed. Add a post-link script to check the siz
From: Naveen N Rao
Move the ftrace stub used to cover inittext before _einittext so that it
is within kernel text, as seen through core_kernel_text(). This is
required for a subsequent change to ftrace.
Signed-off-by: Naveen N Rao
---
arch/powerpc/kernel/vmlinux.lds.S | 3 +--
1 file changed,
From: Naveen N Rao
Commit 61688a82e047 ("powerpc/bpf: enable kfunc call") enhanced
bpf_jit_emit_func_call_hlp() to handle calls out to module region, where
bpf progs are generated. The only difference now between
bpf_jit_emit_func_call_hlp() and bpf_jit_emit_func_call_rel() is in
handling of the
From: Naveen N Rao
To simplify upcoming changes to ftrace, add a check to skip actual
instruction patching if the old and new instructions are the same. We
still validate that the instruction is what we expect, but don't
actually patch the same instruction again.
Signed-off-by: Naveen N Rao
---
From: Naveen N Rao
Pointer to struct module is only relevant for ftrace records belonging
to kernel modules. Having this field in dyn_arch_ftrace wastes memory
for all ftrace records belonging to the kernel. Remove the same in
favour of looking up the module from the ftrace record address, simila
From: Naveen N Rao
Minor refactor for converting #ifdef to IS_ENABLED().
Reviewed-by: Nicholas Piggin
Signed-off-by: Naveen N Rao
---
arch/powerpc/kernel/module_64.c | 10 ++
1 file changed, 2 insertions(+), 8 deletions(-)
diff --git a/arch/powerpc/kernel/module_64.c b/arch/powerpc/k
From: Naveen N Rao
On 32-bit powerpc, gcc generates a three instruction sequence for
function profiling:
mflrr0
stw r0, 4(r1)
bl _mcount
On kernel boot, the call to _mcount() is nop-ed out, to be patched back
in when ftrace is actually enabled. The 'stw' inst
From: Naveen N Rao
Rather than hard-coding the offset into a function to be used to
determine if a kprobe is at function entry, use ftrace_location() to
determine the ftrace location within the function and categorize all
instructions till that offset to be function entry.
For functions that can
From: Naveen N Rao
Gcc v5.x emits a 3-instruction sequence for -mprofile-kernel:
mflrr0
std r0, 16(r1)
bl _mcount
Gcc v6.x moved to a simpler 2-instruction sequence by removing the 'std'
instruction. The store saved the return address in the LR save area in
t
This is v5 of the series posted here:
https://lore.kernel.org/all/cover.1720942106.git.nav...@kernel.org/
This series reworks core ftrace support on powerpc to have the function
profiling sequence moved out of line. This enables us to have a single
nop at kernel function entry virtually eliminatin
From: Naveen N Rao
So far, we have relied on the fact that gcc supports both
-mprofile-kernel, as well as -fpatchable-function-entry, and clang
supports neither. Our Makefile only checks for CONFIG_MPROFILE_KERNEL to
decide which files to build. Clang has a feature request out [*] to
implement -f
Hello:
This patch was applied to netdev/net-next.git (main)
by Jakub Kicinski :
On Sat, 14 Sep 2024 10:18:20 +0200 you wrote:
> Some platforms that use fs_enet don't have the PER register clock. This
> optional dependency on the clock was incorrectly made mandatory when
> switching to devm_ acces
Hi Ard,
On Fri, Sep 13, 2024 at 05:00:42PM +0200, Ard Biesheuvel wrote:
> Hi Mike,
>
> On Mon, 9 Sept 2024 at 08:51, Mike Rapoport wrote:
...
> > +static void execmem_fill_trapping_insns(void *ptr, size_t size, bool
> > writable)
> > +{
> > + if (execmem_info->fill_trapping_insns)
> > +
Christophe Leroy writes:
> Le 14/09/2024 à 04:02, Michael Ellerman a écrit :
...
>>
>> diff --git a/arch/powerpc/include/asm/atomic.h
>> b/arch/powerpc/include/asm/atomic.h
>> index 5bf6a4d49268..0e41c1da82dd 100644
>> --- a/arch/powerpc/include/asm/atomic.h
>> +++ b/arch/powerpc/include/asm/ato
On Sat, Sep 14, 2024 at 08:50:46AM +0200, Christophe Leroy wrote:
> Hi,
>
> Le 13/09/2024 à 21:22, Matthew Wilcox a écrit :
> > On Fri, Sep 13, 2024 at 07:20:36PM +, Mina Almasry wrote:
> > > +++ b/include/linux/page-flags.h
> > > @@ -239,8 +239,8 @@ static inline unsigned long _compound_head(
Can I get an Acked-by from the POWERPC maintainers for this patch?
Thanks!
-- Steve
[ Note this is modifies the return side ]
On Fri, 13 Sep 2024 00:09:02 +0900
"Masami Hiramatsu (Google)" wrote:
> From: Masami Hiramatsu (Google)
>
> Pass ftrace_regs to the fgraph_ops::retfunc(). If ftrac
Can I get an Acked-by from the POWERPC maintainers for this patch?
Thanks!
-- Steve
On Fri, 13 Sep 2024 00:08:40 +0900
"Masami Hiramatsu (Google)" wrote:
> From: Masami Hiramatsu (Google)
>
> Pass ftrace_regs to the fgraph_ops::entryfunc(). If ftrace_regs is not
> available, it passes a N
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