[V3,0/7] riscv: Add GENERIC_ENTRY, irq stack support

Message

Guo Ren Sept. 6, 2022, 3:54 a.m. UTC

From: Guo Ren <[e-mail]>

The patches convert riscv to use the generic entry infrastructure from
kernel/entry/*. Add independent irq stacks (IRQ_STACKS) for percpu to
prevent kernel stack overflows. Add the HAVE_SOFTIRQ_ON_OWN_STACK
feature for the IRQ_STACKS config. You can try it directly with [1].

[1] https://github.com/guoren83/linux/tree/generic_entry_v3

V3:
 - Fixup CONFIG_COMPAT=n compile error
 - Add THREAD_SIZE_ORDER config
 - Optimize elf_kexec.c warning fixup
 - Add static to irq_stack_ptr definition

V2:
 Link: https://lore.kernel.org/linux-riscv/[e-mail]/
 - Fixup compile error by include "riscv: ptrace: Remove duplicate
   operation"
 - Fixup compile warning
   Reported-by: kernel test robot <[e-mail]>
 - Add test repo link in cover letter

V1:
 Link: https://lore.kernel.org/linux-riscv/[e-mail]/ 

Guo Ren (7):
  riscv: elf_kexec: Fixup compile warning
  riscv: compat_syscall_table: Fixup compile warning
  riscv: ptrace: Remove duplicate operation
  riscv: convert to generic entry
  riscv: Support HAVE_IRQ_EXIT_ON_IRQ_STACK
  riscv: Support HAVE_SOFTIRQ_ON_OWN_STACK
  riscv: Add config of thread stack size

 arch/riscv/Kconfig                    |  19 ++
 arch/riscv/include/asm/csr.h          |   1 -
 arch/riscv/include/asm/entry-common.h |   8 +
 arch/riscv/include/asm/irq.h          |   3 +
 arch/riscv/include/asm/ptrace.h       |  10 +-
 arch/riscv/include/asm/stacktrace.h   |   5 +
 arch/riscv/include/asm/syscall.h      |   6 +
 arch/riscv/include/asm/thread_info.h  |  19 +-
 arch/riscv/include/asm/vmap_stack.h   |  28 +++
 arch/riscv/kernel/Makefile            |   1 +
 arch/riscv/kernel/elf_kexec.c         |   2 +-
 arch/riscv/kernel/entry.S             | 255 +++++---------------------
 arch/riscv/kernel/irq.c               |  75 ++++++++
 arch/riscv/kernel/ptrace.c            |  41 -----
 arch/riscv/kernel/signal.c            |  21 +--
 arch/riscv/kernel/sys_riscv.c         |  27 +++
 arch/riscv/kernel/traps.c             |  11 ++
 arch/riscv/mm/fault.c                 |  12 +-
 18 files changed, 259 insertions(+), 285 deletions(-)
 create mode 100644 arch/riscv/include/asm/entry-common.h
 create mode 100644 arch/riscv/include/asm/vmap_stack.h

Comments

Conor Dooley Sept. 6, 2022, 5:42 p.m. UTC | #1

On 06/09/2022 04:54, [e-mail] wrote:
> From: Guo Ren <[e-mail]>
> 
> The patches convert riscv to use the generic entry infrastructure from
> kernel/entry/*. Add independent irq stacks (IRQ_STACKS) for percpu to
> prevent kernel stack overflows. Add the HAVE_SOFTIRQ_ON_OWN_STACK
> feature for the IRQ_STACKS config. You can try it directly with [1].

Hey Guo Ren,
I applied this patchset to v6.0-rc4 & ran into a build error:
/stuff/linux/arch/riscv/kernel/entry.S:347:9: error: operand must be a bare symbol name
 la a3, ((1 << (12)) << (2 + 0))
        ^
  CC      arch/riscv/kernel/process.o
make[5]: *** [/stuff/linux/scripts/Makefile.build:322: arch/riscv/kernel/entry.o] Error 1
make[5]: *** Waiting for unfinished jobs....

Thanks,
Conor.
> 
> [1] https://github.com/guoren83/linux/tree/generic_entry_v3
> 
> V3:
>  - Fixup CONFIG_COMPAT=n compile error
>  - Add THREAD_SIZE_ORDER config
>  - Optimize elf_kexec.c warning fixup
>  - Add static to irq_stack_ptr definition
> 
> V2:
>  Link: https://lore.kernel.org/linux-riscv/[e-mail]/
>  - Fixup compile error by include "riscv: ptrace: Remove duplicate
>    operation"
>  - Fixup compile warning
>    Reported-by: kernel test robot <[e-mail]>
>  - Add test repo link in cover letter
> 
> V1:
>  Link: https://lore.kernel.org/linux-riscv/[e-mail]/ 
> 
> Guo Ren (7):
>   riscv: elf_kexec: Fixup compile warning
>   riscv: compat_syscall_table: Fixup compile warning
>   riscv: ptrace: Remove duplicate operation
>   riscv: convert to generic entry
>   riscv: Support HAVE_IRQ_EXIT_ON_IRQ_STACK
>   riscv: Support HAVE_SOFTIRQ_ON_OWN_STACK
>   riscv: Add config of thread stack size
> 
>  arch/riscv/Kconfig                    |  19 ++
>  arch/riscv/include/asm/csr.h          |   1 -
>  arch/riscv/include/asm/entry-common.h |   8 +
>  arch/riscv/include/asm/irq.h          |   3 +
>  arch/riscv/include/asm/ptrace.h       |  10 +-
>  arch/riscv/include/asm/stacktrace.h   |   5 +
>  arch/riscv/include/asm/syscall.h      |   6 +
>  arch/riscv/include/asm/thread_info.h  |  19 +-
>  arch/riscv/include/asm/vmap_stack.h   |  28 +++
>  arch/riscv/kernel/Makefile            |   1 +
>  arch/riscv/kernel/elf_kexec.c         |   2 +-
>  arch/riscv/kernel/entry.S             | 255 +++++---------------------
>  arch/riscv/kernel/irq.c               |  75 ++++++++
>  arch/riscv/kernel/ptrace.c            |  41 -----
>  arch/riscv/kernel/signal.c            |  21 +--
>  arch/riscv/kernel/sys_riscv.c         |  27 +++
>  arch/riscv/kernel/traps.c             |  11 ++
>  arch/riscv/mm/fault.c                 |  12 +-
>  18 files changed, 259 insertions(+), 285 deletions(-)
>  create mode 100644 arch/riscv/include/asm/entry-common.h
>  create mode 100644 arch/riscv/include/asm/vmap_stack.h
>

Guo Ren Sept. 7, 2022, 12:54 a.m. UTC | #2

On Wed, Sep 7, 2022 at 1:42 AM <[e-mail]> wrote:
>
> On 06/09/2022 04:54, [e-mail] wrote:
> > From: Guo Ren <[e-mail]>
> >
> > The patches convert riscv to use the generic entry infrastructure from
> > kernel/entry/*. Add independent irq stacks (IRQ_STACKS) for percpu to
> > prevent kernel stack overflows. Add the HAVE_SOFTIRQ_ON_OWN_STACK
> > feature for the IRQ_STACKS config. You can try it directly with [1].
>
> Hey Guo Ren,
> I applied this patchset to v6.0-rc4 & ran into a build error:
> /stuff/linux/arch/riscv/kernel/entry.S:347:9: error: operand must be a bare symbol name
>  la a3, ((1 << (12)) << (2 + 0))
Yes, please try:
-       la      a3, IRQ_STACK_SIZE
+       li      a3, IRQ_STACK_SIZE

la is for the symbol, not immediate. But why does my toolchain not
report the error?

➜  linux git:(generic_entry_v3) make ARCH=riscv
CROSS_COMPILE=riscv64-unknown-linux-gnu- EXTRA_CFLAGS+=-g
O=../build-riscv/ -kj62 all -kj
➜  linux git:(generic_entry_v3) riscv64-unknown-linux-gnu-gcc -v
Using built-in specs.
COLLECT_GCC=riscv64-unknown-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/opt/riscv/libexec/gcc/riscv64-unknown-linux-gnu/11.1.0/lto-wrapper
Target: riscv64-unknown-linux-gnu
Configured with:
/home/guoren/source/riscv-gnu-toolchain/riscv-gcc/configure
--target=riscv64-unknown-linux-gnu --prefix=/opt/riscv
--with-sysroot=/opt/riscv/sysroot --with-pkgversion=g5964b5cd7272
--with-system-zlib --enable-shared --enable-tls
--enable-languages=c,c++,fortran --disable-libmudflap --disable-libssp
--disable-libquadmath --disable-libsanitizer --disable-nls
--disable-bootstrap --src=.././riscv-gcc --enable-multilib
--with-abi=lp64d --with-arch=rv64imafdc --with-tune=rocket
--with-isa-spec=2.2 'CFLAGS_FOR_TARGET=-O2   -mcmodel=medlow'
'CXXFLAGS_FOR_TARGET=-O2   -mcmodel=medlow'
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 11.1.0 (g5964b5cd7272)



>         ^
>   CC      arch/riscv/kernel/process.o
> make[5]: *** [/stuff/linux/scripts/Makefile.build:322: arch/riscv/kernel/entry.o] Error 1
> make[5]: *** Waiting for unfinished jobs....
>
> Thanks,
> Conor.
> >
> > [1] https://github.com/guoren83/linux/tree/generic_entry_v3
> >
> > V3:
> >  - Fixup CONFIG_COMPAT=n compile error
> >  - Add THREAD_SIZE_ORDER config
> >  - Optimize elf_kexec.c warning fixup
> >  - Add static to irq_stack_ptr definition
> >
> > V2:
> >  Link: https://lore.kernel.org/linux-riscv/[e-mail]/
> >  - Fixup compile error by include "riscv: ptrace: Remove duplicate
> >    operation"
> >  - Fixup compile warning
> >    Reported-by: kernel test robot <[e-mail]>
> >  - Add test repo link in cover letter
> >
> > V1:
> >  Link: https://lore.kernel.org/linux-riscv/[e-mail]/
> >
> > Guo Ren (7):
> >   riscv: elf_kexec: Fixup compile warning
> >   riscv: compat_syscall_table: Fixup compile warning
> >   riscv: ptrace: Remove duplicate operation
> >   riscv: convert to generic entry
> >   riscv: Support HAVE_IRQ_EXIT_ON_IRQ_STACK
> >   riscv: Support HAVE_SOFTIRQ_ON_OWN_STACK
> >   riscv: Add config of thread stack size
> >
> >  arch/riscv/Kconfig                    |  19 ++
> >  arch/riscv/include/asm/csr.h          |   1 -
> >  arch/riscv/include/asm/entry-common.h |   8 +
> >  arch/riscv/include/asm/irq.h          |   3 +
> >  arch/riscv/include/asm/ptrace.h       |  10 +-
> >  arch/riscv/include/asm/stacktrace.h   |   5 +
> >  arch/riscv/include/asm/syscall.h      |   6 +
> >  arch/riscv/include/asm/thread_info.h  |  19 +-
> >  arch/riscv/include/asm/vmap_stack.h   |  28 +++
> >  arch/riscv/kernel/Makefile            |   1 +
> >  arch/riscv/kernel/elf_kexec.c         |   2 +-
> >  arch/riscv/kernel/entry.S             | 255 +++++---------------------
> >  arch/riscv/kernel/irq.c               |  75 ++++++++
> >  arch/riscv/kernel/ptrace.c            |  41 -----
> >  arch/riscv/kernel/signal.c            |  21 +--
> >  arch/riscv/kernel/sys_riscv.c         |  27 +++
> >  arch/riscv/kernel/traps.c             |  11 ++
> >  arch/riscv/mm/fault.c                 |  12 +-
> >  18 files changed, 259 insertions(+), 285 deletions(-)
> >  create mode 100644 arch/riscv/include/asm/entry-common.h
> >  create mode 100644 arch/riscv/include/asm/vmap_stack.h
> >

Guo Ren Sept. 7, 2022, 2:52 a.m. UTC | #3

Hi Conor,

I've found the root cause, you are using llvm:

$ grep "bare sym" llvm -rn |grep RISCV
llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp:1296: return
Error(ErrorLoc, "operand must be a bare symbol name");
llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp:1304: return
Error(ErrorLoc, "operand must be a bare symbol name");

That means we could fix up Binutils with a warning at least.

Thx for pointing it out.

On Wed, Sep 7, 2022 at 8:54 AM Guo Ren <[e-mail]> wrote:
>
> On Wed, Sep 7, 2022 at 1:42 AM <[e-mail]> wrote:
> >
> > On 06/09/2022 04:54, [e-mail] wrote:
> > > From: Guo Ren <[e-mail]>
> > >
> > > The patches convert riscv to use the generic entry infrastructure from
> > > kernel/entry/*. Add independent irq stacks (IRQ_STACKS) for percpu to
> > > prevent kernel stack overflows. Add the HAVE_SOFTIRQ_ON_OWN_STACK
> > > feature for the IRQ_STACKS config. You can try it directly with [1].
> >
> > Hey Guo Ren,
> > I applied this patchset to v6.0-rc4 & ran into a build error:
> > /stuff/linux/arch/riscv/kernel/entry.S:347:9: error: operand must be a bare symbol name
> >  la a3, ((1 << (12)) << (2 + 0))
> Yes, please try:
> -       la      a3, IRQ_STACK_SIZE
> +       li      a3, IRQ_STACK_SIZE
>
> la is for the symbol, not immediate. But why does my toolchain not
> report the error?
>
> ➜  linux git:(generic_entry_v3) make ARCH=riscv
> CROSS_COMPILE=riscv64-unknown-linux-gnu- EXTRA_CFLAGS+=-g
> O=../build-riscv/ -kj62 all -kj
> ➜  linux git:(generic_entry_v3) riscv64-unknown-linux-gnu-gcc -v
> Using built-in specs.
> COLLECT_GCC=riscv64-unknown-linux-gnu-gcc
> COLLECT_LTO_WRAPPER=/opt/riscv/libexec/gcc/riscv64-unknown-linux-gnu/11.1.0/lto-wrapper
> Target: riscv64-unknown-linux-gnu
> Configured with:
> /home/guoren/source/riscv-gnu-toolchain/riscv-gcc/configure
> --target=riscv64-unknown-linux-gnu --prefix=/opt/riscv
> --with-sysroot=/opt/riscv/sysroot --with-pkgversion=g5964b5cd7272
> --with-system-zlib --enable-shared --enable-tls
> --enable-languages=c,c++,fortran --disable-libmudflap --disable-libssp
> --disable-libquadmath --disable-libsanitizer --disable-nls
> --disable-bootstrap --src=.././riscv-gcc --enable-multilib
> --with-abi=lp64d --with-arch=rv64imafdc --with-tune=rocket
> --with-isa-spec=2.2 'CFLAGS_FOR_TARGET=-O2   -mcmodel=medlow'
> 'CXXFLAGS_FOR_TARGET=-O2   -mcmodel=medlow'
> Thread model: posix
> Supported LTO compression algorithms: zlib
> gcc version 11.1.0 (g5964b5cd7272)
>
>
>
> >         ^
> >   CC      arch/riscv/kernel/process.o
> > make[5]: *** [/stuff/linux/scripts/Makefile.build:322: arch/riscv/kernel/entry.o] Error 1
> > make[5]: *** Waiting for unfinished jobs....
> >
> > Thanks,
> > Conor.
> > >
> > > [1] https://github.com/guoren83/linux/tree/generic_entry_v3
> > >
> > > V3:
> > >  - Fixup CONFIG_COMPAT=n compile error
> > >  - Add THREAD_SIZE_ORDER config
> > >  - Optimize elf_kexec.c warning fixup
> > >  - Add static to irq_stack_ptr definition
> > >
> > > V2:
> > >  Link: https://lore.kernel.org/linux-riscv/[e-mail]/
> > >  - Fixup compile error by include "riscv: ptrace: Remove duplicate
> > >    operation"
> > >  - Fixup compile warning
> > >    Reported-by: kernel test robot <[e-mail]>
> > >  - Add test repo link in cover letter
> > >
> > > V1:
> > >  Link: https://lore.kernel.org/linux-riscv/[e-mail]/
> > >
> > > Guo Ren (7):
> > >   riscv: elf_kexec: Fixup compile warning
> > >   riscv: compat_syscall_table: Fixup compile warning
> > >   riscv: ptrace: Remove duplicate operation
> > >   riscv: convert to generic entry
> > >   riscv: Support HAVE_IRQ_EXIT_ON_IRQ_STACK
> > >   riscv: Support HAVE_SOFTIRQ_ON_OWN_STACK
> > >   riscv: Add config of thread stack size
> > >
> > >  arch/riscv/Kconfig                    |  19 ++
> > >  arch/riscv/include/asm/csr.h          |   1 -
> > >  arch/riscv/include/asm/entry-common.h |   8 +
> > >  arch/riscv/include/asm/irq.h          |   3 +
> > >  arch/riscv/include/asm/ptrace.h       |  10 +-
> > >  arch/riscv/include/asm/stacktrace.h   |   5 +
> > >  arch/riscv/include/asm/syscall.h      |   6 +
> > >  arch/riscv/include/asm/thread_info.h  |  19 +-
> > >  arch/riscv/include/asm/vmap_stack.h   |  28 +++
> > >  arch/riscv/kernel/Makefile            |   1 +
> > >  arch/riscv/kernel/elf_kexec.c         |   2 +-
> > >  arch/riscv/kernel/entry.S             | 255 +++++---------------------
> > >  arch/riscv/kernel/irq.c               |  75 ++++++++
> > >  arch/riscv/kernel/ptrace.c            |  41 -----
> > >  arch/riscv/kernel/signal.c            |  21 +--
> > >  arch/riscv/kernel/sys_riscv.c         |  27 +++
> > >  arch/riscv/kernel/traps.c             |  11 ++
> > >  arch/riscv/mm/fault.c                 |  12 +-
> > >  18 files changed, 259 insertions(+), 285 deletions(-)
> > >  create mode 100644 arch/riscv/include/asm/entry-common.h
> > >  create mode 100644 arch/riscv/include/asm/vmap_stack.h
> > >
>
>
>
> --
> Best Regards
>  Guo Ren

Conor Dooley Sept. 7, 2022, 6:23 a.m. UTC | #4

On 07/09/2022 03:52, Guo Ren wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> 
> Hi Conor,
> 
> I've found the root cause, you are using llvm:

Yup, probably should have specified - sorry. I didn't realise that
that was something GCC wouldn't complain about. It was an LLVM=1
build with clang-15.

I usually do builds with clang while testing patches as it seems
to be lesser used.

Thanks,
Conor.

> 
> $ grep "bare sym" llvm -rn |grep RISCV
> llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp:1296: return
> Error(ErrorLoc, "operand must be a bare symbol name");
> llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp:1304: return
> Error(ErrorLoc, "operand must be a bare symbol name");
> 
> That means we could fix up Binutils with a warning at least.
> 
> Thx for pointing it out.
> 
> On Wed, Sep 7, 2022 at 8:54 AM Guo Ren <[e-mail]> wrote:
>>
>> On Wed, Sep 7, 2022 at 1:42 AM <[e-mail]> wrote:
>>>
>>> On 06/09/2022 04:54, [e-mail] wrote:
>>>> From: Guo Ren <[e-mail]>
>>>>
>>>> The patches convert riscv to use the generic entry infrastructure from
>>>> kernel/entry/*. Add independent irq stacks (IRQ_STACKS) for percpu to
>>>> prevent kernel stack overflows. Add the HAVE_SOFTIRQ_ON_OWN_STACK
>>>> feature for the IRQ_STACKS config. You can try it directly with [1].
>>>
>>> Hey Guo Ren,
>>> I applied this patchset to v6.0-rc4 & ran into a build error:
>>> /stuff/linux/arch/riscv/kernel/entry.S:347:9: error: operand must be a bare symbol name
>>>   la a3, ((1 << (12)) << (2 + 0))
>> Yes, please try:
>> -       la      a3, IRQ_STACK_SIZE
>> +       li      a3, IRQ_STACK_SIZE
>>
>> la is for the symbol, not immediate. But why does my toolchain not
>> report the error?
>>
>> ➜  linux git:(generic_entry_v3) make ARCH=riscv
>> CROSS_COMPILE=riscv64-unknown-linux-gnu- EXTRA_CFLAGS+=-g
>> O=../build-riscv/ -kj62 all -kj
>> ➜  linux git:(generic_entry_v3) riscv64-unknown-linux-gnu-gcc -v
>> Using built-in specs.
>> COLLECT_GCC=riscv64-unknown-linux-gnu-gcc
>> COLLECT_LTO_WRAPPER=/opt/riscv/libexec/gcc/riscv64-unknown-linux-gnu/11.1.0/lto-wrapper
>> Target: riscv64-unknown-linux-gnu
>> Configured with:
>> /home/guoren/source/riscv-gnu-toolchain/riscv-gcc/configure
>> --target=riscv64-unknown-linux-gnu --prefix=/opt/riscv
>> --with-sysroot=/opt/riscv/sysroot --with-pkgversion=g5964b5cd7272
>> --with-system-zlib --enable-shared --enable-tls
>> --enable-languages=c,c++,fortran --disable-libmudflap --disable-libssp
>> --disable-libquadmath --disable-libsanitizer --disable-nls
>> --disable-bootstrap --src=.././riscv-gcc --enable-multilib
>> --with-abi=lp64d --with-arch=rv64imafdc --with-tune=rocket
>> --with-isa-spec=2.2 'CFLAGS_FOR_TARGET=-O2   -mcmodel=medlow'
>> 'CXXFLAGS_FOR_TARGET=-O2   -mcmodel=medlow'
>> Thread model: posix
>> Supported LTO compression algorithms: zlib
>> gcc version 11.1.0 (g5964b5cd7272)
>>
>>
>>
>>>          ^
>>>    CC      arch/riscv/kernel/process.o
>>> make[5]: *** [/stuff/linux/scripts/Makefile.build:322: arch/riscv/kernel/entry.o] Error 1
>>> make[5]: *** Waiting for unfinished jobs....
>>>
>>> Thanks,
>>> Conor.
>>>>
>>>> [1] https://github.com/guoren83/linux/tree/generic_entry_v3
>>>>
>>>> V3:
>>>>   - Fixup CONFIG_COMPAT=n compile error
>>>>   - Add THREAD_SIZE_ORDER config
>>>>   - Optimize elf_kexec.c warning fixup
>>>>   - Add static to irq_stack_ptr definition
>>>>
>>>> V2:
>>>>   Link: https://lore.kernel.org/linux-riscv/[e-mail]/
>>>>   - Fixup compile error by include "riscv: ptrace: Remove duplicate
>>>>     operation"
>>>>   - Fixup compile warning
>>>>     Reported-by: kernel test robot <[e-mail]>
>>>>   - Add test repo link in cover letter
>>>>
>>>> V1:
>>>>   Link: https://lore.kernel.org/linux-riscv/[e-mail]/
>>>>
>>>> Guo Ren (7):
>>>>    riscv: elf_kexec: Fixup compile warning
>>>>    riscv: compat_syscall_table: Fixup compile warning
>>>>    riscv: ptrace: Remove duplicate operation
>>>>    riscv: convert to generic entry
>>>>    riscv: Support HAVE_IRQ_EXIT_ON_IRQ_STACK
>>>>    riscv: Support HAVE_SOFTIRQ_ON_OWN_STACK
>>>>    riscv: Add config of thread stack size
>>>>
>>>>   arch/riscv/Kconfig                    |  19 ++
>>>>   arch/riscv/include/asm/csr.h          |   1 -
>>>>   arch/riscv/include/asm/entry-common.h |   8 +
>>>>   arch/riscv/include/asm/irq.h          |   3 +
>>>>   arch/riscv/include/asm/ptrace.h       |  10 +-
>>>>   arch/riscv/include/asm/stacktrace.h   |   5 +
>>>>   arch/riscv/include/asm/syscall.h      |   6 +
>>>>   arch/riscv/include/asm/thread_info.h  |  19 +-
>>>>   arch/riscv/include/asm/vmap_stack.h   |  28 +++
>>>>   arch/riscv/kernel/Makefile            |   1 +
>>>>   arch/riscv/kernel/elf_kexec.c         |   2 +-
>>>>   arch/riscv/kernel/entry.S             | 255 +++++---------------------
>>>>   arch/riscv/kernel/irq.c               |  75 ++++++++
>>>>   arch/riscv/kernel/ptrace.c            |  41 -----
>>>>   arch/riscv/kernel/signal.c            |  21 +--
>>>>   arch/riscv/kernel/sys_riscv.c         |  27 +++
>>>>   arch/riscv/kernel/traps.c             |  11 ++
>>>>   arch/riscv/mm/fault.c                 |  12 +-
>>>>   18 files changed, 259 insertions(+), 285 deletions(-)
>>>>   create mode 100644 arch/riscv/include/asm/entry-common.h
>>>>   create mode 100644 arch/riscv/include/asm/vmap_stack.h
>>>>
>>
>>
>>
>> --
>> Best Regards
>>   Guo Ren
> 
> 
> 
> --
> Best Regards
>   Guo Ren

Guo Ren Sept. 7, 2022, 7:06 a.m. UTC | #5

On Wed, Sep 7, 2022 at 2:23 PM <[e-mail]> wrote:
>
> On 07/09/2022 03:52, Guo Ren wrote:
> > EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> >
> > Hi Conor,
> >
> > I've found the root cause, you are using llvm:
>
> Yup, probably should have specified - sorry. I didn't realise that
It's my typo bug. You reminded me of using clang.

> that was something GCC wouldn't complain about. It was an LLVM=1
> build with clang-15.
>
> I usually do builds with clang while testing patches as it seems
> to be lesser used.
>
> Thanks,
> Conor.
>
> >
> > $ grep "bare sym" llvm -rn |grep RISCV
> > llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp:1296: return
> > Error(ErrorLoc, "operand must be a bare symbol name");
> > llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp:1304: return
> > Error(ErrorLoc, "operand must be a bare symbol name");
> >
> > That means we could fix up Binutils with a warning at least.
> >
> > Thx for pointing it out.
> >
> > On Wed, Sep 7, 2022 at 8:54 AM Guo Ren <[e-mail]> wrote:
> >>
> >> On Wed, Sep 7, 2022 at 1:42 AM <[e-mail]> wrote:
> >>>
> >>> On 06/09/2022 04:54, [e-mail] wrote:
> >>>> From: Guo Ren <[e-mail]>
> >>>>
> >>>> The patches convert riscv to use the generic entry infrastructure from
> >>>> kernel/entry/*. Add independent irq stacks (IRQ_STACKS) for percpu to
> >>>> prevent kernel stack overflows. Add the HAVE_SOFTIRQ_ON_OWN_STACK
> >>>> feature for the IRQ_STACKS config. You can try it directly with [1].
> >>>
> >>> Hey Guo Ren,
> >>> I applied this patchset to v6.0-rc4 & ran into a build error:
> >>> /stuff/linux/arch/riscv/kernel/entry.S:347:9: error: operand must be a bare symbol name
> >>>   la a3, ((1 << (12)) << (2 + 0))
> >> Yes, please try:
> >> -       la      a3, IRQ_STACK_SIZE
> >> +       li      a3, IRQ_STACK_SIZE
> >>
> >> la is for the symbol, not immediate. But why does my toolchain not
> >> report the error?
> >>
> >> ➜  linux git:(generic_entry_v3) make ARCH=riscv
> >> CROSS_COMPILE=riscv64-unknown-linux-gnu- EXTRA_CFLAGS+=-g
> >> O=../build-riscv/ -kj62 all -kj
> >> ➜  linux git:(generic_entry_v3) riscv64-unknown-linux-gnu-gcc -v
> >> Using built-in specs.
> >> COLLECT_GCC=riscv64-unknown-linux-gnu-gcc
> >> COLLECT_LTO_WRAPPER=/opt/riscv/libexec/gcc/riscv64-unknown-linux-gnu/11.1.0/lto-wrapper
> >> Target: riscv64-unknown-linux-gnu
> >> Configured with:
> >> /home/guoren/source/riscv-gnu-toolchain/riscv-gcc/configure
> >> --target=riscv64-unknown-linux-gnu --prefix=/opt/riscv
> >> --with-sysroot=/opt/riscv/sysroot --with-pkgversion=g5964b5cd7272
> >> --with-system-zlib --enable-shared --enable-tls
> >> --enable-languages=c,c++,fortran --disable-libmudflap --disable-libssp
> >> --disable-libquadmath --disable-libsanitizer --disable-nls
> >> --disable-bootstrap --src=.././riscv-gcc --enable-multilib
> >> --with-abi=lp64d --with-arch=rv64imafdc --with-tune=rocket
> >> --with-isa-spec=2.2 'CFLAGS_FOR_TARGET=-O2   -mcmodel=medlow'
> >> 'CXXFLAGS_FOR_TARGET=-O2   -mcmodel=medlow'
> >> Thread model: posix
> >> Supported LTO compression algorithms: zlib
> >> gcc version 11.1.0 (g5964b5cd7272)
> >>
> >>
> >>
> >>>          ^
> >>>    CC      arch/riscv/kernel/process.o
> >>> make[5]: *** [/stuff/linux/scripts/Makefile.build:322: arch/riscv/kernel/entry.o] Error 1
> >>> make[5]: *** Waiting for unfinished jobs....
> >>>
> >>> Thanks,
> >>> Conor.
> >>>>
> >>>> [1] https://github.com/guoren83/linux/tree/generic_entry_v3
> >>>>
> >>>> V3:
> >>>>   - Fixup CONFIG_COMPAT=n compile error
> >>>>   - Add THREAD_SIZE_ORDER config
> >>>>   - Optimize elf_kexec.c warning fixup
> >>>>   - Add static to irq_stack_ptr definition
> >>>>
> >>>> V2:
> >>>>   Link: https://lore.kernel.org/linux-riscv/[e-mail]/
> >>>>   - Fixup compile error by include "riscv: ptrace: Remove duplicate
> >>>>     operation"
> >>>>   - Fixup compile warning
> >>>>     Reported-by: kernel test robot <[e-mail]>
> >>>>   - Add test repo link in cover letter
> >>>>
> >>>> V1:
> >>>>   Link: https://lore.kernel.org/linux-riscv/[e-mail]/
> >>>>
> >>>> Guo Ren (7):
> >>>>    riscv: elf_kexec: Fixup compile warning
> >>>>    riscv: compat_syscall_table: Fixup compile warning
> >>>>    riscv: ptrace: Remove duplicate operation
> >>>>    riscv: convert to generic entry
> >>>>    riscv: Support HAVE_IRQ_EXIT_ON_IRQ_STACK
> >>>>    riscv: Support HAVE_SOFTIRQ_ON_OWN_STACK
> >>>>    riscv: Add config of thread stack size
> >>>>
> >>>>   arch/riscv/Kconfig                    |  19 ++
> >>>>   arch/riscv/include/asm/csr.h          |   1 -
> >>>>   arch/riscv/include/asm/entry-common.h |   8 +
> >>>>   arch/riscv/include/asm/irq.h          |   3 +
> >>>>   arch/riscv/include/asm/ptrace.h       |  10 +-
> >>>>   arch/riscv/include/asm/stacktrace.h   |   5 +
> >>>>   arch/riscv/include/asm/syscall.h      |   6 +
> >>>>   arch/riscv/include/asm/thread_info.h  |  19 +-
> >>>>   arch/riscv/include/asm/vmap_stack.h   |  28 +++
> >>>>   arch/riscv/kernel/Makefile            |   1 +
> >>>>   arch/riscv/kernel/elf_kexec.c         |   2 +-
> >>>>   arch/riscv/kernel/entry.S             | 255 +++++---------------------
> >>>>   arch/riscv/kernel/irq.c               |  75 ++++++++
> >>>>   arch/riscv/kernel/ptrace.c            |  41 -----
> >>>>   arch/riscv/kernel/signal.c            |  21 +--
> >>>>   arch/riscv/kernel/sys_riscv.c         |  27 +++
> >>>>   arch/riscv/kernel/traps.c             |  11 ++
> >>>>   arch/riscv/mm/fault.c                 |  12 +-
> >>>>   18 files changed, 259 insertions(+), 285 deletions(-)
> >>>>   create mode 100644 arch/riscv/include/asm/entry-common.h
> >>>>   create mode 100644 arch/riscv/include/asm/vmap_stack.h
> >>>>
> >>
> >>
> >>
> >> --
> >> Best Regards
> >>   Guo Ren
> >
> >
> >
> > --
> > Best Regards
> >   Guo Ren
>