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 <mhng-ab858def-1533-4cec-9ee9-f6c3f712fd93@palmer-ri-x1c9>
In-Reply-To: <mhng-ab858def-1533-4cec-9ee9-f6c3f712fd93@palmer-ri-x1c9>
From:   Guo Ren <guoren@kernel.org>
Date:   Sat, 30 Apr 2022 13:43:41 +0800
Message-ID: <CAJF2gTT3Uo6wtGs8g-iOEAULE5X4chEtg1eYsZuuPsm6_B-j-w@mail.gmail.com>
Subject: Re: [PATCH V12 00/20] riscv: Add COMPAT mode support for 64BIT
To:     Palmer Dabbelt <palmer@dabbelt.com>
Cc:     Arnd Bergmann <arnd@arndb.de>,
        Greg KH <gregkh@linuxfoundation.org>,
        Christoph Hellwig <hch@lst.de>,
        Nathan Chancellor <nathan@kernel.org>,
        Naresh Kamboju <naresh.kamboju@linaro.org>,
        linux-arch <linux-arch@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        linux-riscv <linux-riscv@lists.infradead.org>,
        linux-s390 <linux-s390@vger.kernel.org>,
        sparclinux <sparclinux@vger.kernel.org>,
        linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
        Parisc List <linux-parisc@vger.kernel.org>,
        "open list:BROADCOM NVRAM DRIVER" <linux-mips@vger.kernel.org>,
        Linux ARM <linux-arm-kernel@lists.infradead.org>,
        "the arch/x86 maintainers" <x86@kernel.org>,
        =?UTF-8?Q?Heiko_St=C3=BCbner?= <heiko@sntech.de>,
        Guo Ren <guoren@linux.alibaba.com>
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On Fri, Apr 29, 2022 at 2:22 AM Palmer Dabbelt <palmer@dabbelt.com> wrote:
>
> On Thu, 28 Apr 2022 05:25:19 PDT (-0700), guoren@kernel.org wrote:
> > Hi Palmer,
> >
> > I see you have taken v12 into your riscv-compat branch and added
> > asm/signal32.h. Do you need me help put compat_sigcontext &
> > compat_ucontext & compat_rt_sigframe into signal32.h? And could we
> > rename signal32.h to compat_signal.h to match compat_signal.c?
> >
> > In the end, thx for taking care of compat patch series.
>
> No problem.  I was just trying to get something clean through all the
> autobuilders before making it look good, I think it didn't fail this
> time so I'll do a bit more refactoring.  Shouldn't be too much longer at
> this point.
Cool, thank you. Hope it could be in v5.19.

>
> >
> >
> > On Tue, Apr 5, 2022 at 3:13 PM <guoren@kernel.org> wrote:
> >>
> >> From: Guo Ren <guoren@linux.alibaba.com>
> >>
> >> Currently, most 64-bit architectures (x86, parisc, powerpc, arm64,
> >> s390, mips, sparc) have supported COMPAT mode. But they all have
> >> history issues and can't use standard linux unistd.h. RISC-V would
> >> be first standard __SYSCALL_COMPAT user of include/uapi/asm-generic
> >> /unistd.h.
> >>
> >> The patchset are based on v5.18-rc1, you can compare rv64-compat
> >> v.s. rv32-native in qemu with following steps:
> >>
> >>  - Prepare rv32 rootfs & fw_jump.bin by buildroot.org
> >>    $ git clone git://git.busybox.net/buildroot
> >>    $ cd buildroot
> >>    $ make qemu_riscv32_virt_defconfig O=3Dqemu_riscv32_virt_defconfig
> >>    $ make -C qemu_riscv32_virt_defconfig
> >>    $ make qemu_riscv64_virt_defconfig O=3Dqemu_riscv64_virt_defconfig
> >>    $ make -C qemu_riscv64_virt_defconfig
> >>    (Got fw_jump.bin & rootfs.ext2 in qemu_riscvXX_virt_defconfig/image=
s)
> >>
> >>  - Prepare Linux rv32 & rv64 Image
> >>    $ git clone git@github.com:c-sky/csky-linux.git -b riscv_compat_v12=
 linux
> >>    $ cd linux
> >>    $ echo "CONFIG_STRICT_KERNEL_RWX=3Dn" >> arch/riscv/configs/defconf=
ig
> >>    $ echo "CONFIG_STRICT_MODULE_RWX=3Dn" >> arch/riscv/configs/defconf=
ig
> >>    $ make ARCH=3Driscv CROSS_COMPILE=3Driscv32-buildroot-linux-gnu- O=
=3D../build-rv32/ rv32_defconfig
> >>    $ make ARCH=3Driscv CROSS_COMPILE=3Driscv32-buildroot-linux-gnu- O=
=3D../build-rv32/ Image
> >>    $ make ARCH=3Driscv CROSS_COMPILE=3Driscv64-buildroot-linux-gnu- O=
=3D../build-rv64/ defconfig
> >>    $ make ARCH=3Driscv CROSS_COMPILE=3Driscv64-buildroot-linux-gnu- O=
=3D../build-rv64/ Image
> >>
> >>  - Prepare Qemu:
> >>    $ git clone https://gitlab.com/qemu-project/qemu.git -b master linu=
x
> >>    $ cd qemu
> >>    $ ./configure --target-list=3D"riscv64-softmmu riscv32-softmmu"
> >>    $ make
> >>
> >> Now let's compare rv64-compat with rv32-native memory footprint with a=
lmost the same
> >> defconfig, rootfs, opensbi in one qemu.
> >>
> >>  - Run rv64 with rv32 rootfs in compat mode:
> >>    $ ./build/qemu-system-riscv64 -cpu rv64 -M virt -m 64m -nographic -=
bios qemu_riscv64_virt_defconfig/images/fw_jump.bin -kernel build-rv64/Imag=
e -drive file qemu_riscv32_virt_defconfig/images/rootfs.ext2,format=3Draw,i=
d=3Dhd0 -device virtio-blk-device,drive=3Dhd0 -append "rootwait root=3D/dev=
/vda ro console=3DttyS0 earlycon=3Dsbi" -netdev user,id=3Dnet0 -device virt=
io-net-device,netdev=3Dnet0
> >>
> >> QEMU emulator version 6.2.50 (v6.2.0-29-g196d7182c8)
> >> OpenSBI v0.9
> >> [    0.000000] Linux version 5.16.0-rc6-00017-g750f87086bdd-dirty (guo=
ren@guoren-Z87-HD3) (riscv64-unknown-linux-gnu-gcc (GCC) 10.2.0, GNU ld (GN=
U Binutils) 2.37) #96 SMP Tue Dec 28 21:01:55 CST 2021
> >> [    0.000000] OF: fdt: Ignoring memory range 0x80000000 - 0x80200000
> >> [    0.000000] Machine model: riscv-virtio,qemu
> >> [    0.000000] earlycon: sbi0 at I/O port 0x0 (options '')
> >> [    0.000000] printk: bootconsole [sbi0] enabled
> >> [    0.000000] efi: UEFI not found.
> >> [    0.000000] Zone ranges:
> >> [    0.000000]   DMA32    [mem 0x0000000080200000-0x0000000083ffffff]
> >> [    0.000000]   Normal   empty
> >> [    0.000000] Movable zone start for each node
> >> [    0.000000] Early memory node ranges
> >> [    0.000000]   node   0: [mem 0x0000000080200000-0x0000000083ffffff]
> >> [    0.000000] Initmem setup node 0 [mem 0x0000000080200000-0x00000000=
83ffffff]
> >> [    0.000000] SBI specification v0.2 detected
> >> [    0.000000] SBI implementation ID=3D0x1 Version=3D0x9
> >> [    0.000000] SBI TIME extension detected
> >> [    0.000000] SBI IPI extension detected
> >> [    0.000000] SBI RFENCE extension detected
> >> [    0.000000] SBI v0.2 HSM extension detected
> >> [    0.000000] riscv: ISA extensions acdfhimsu
> >> [    0.000000] riscv: ELF capabilities acdfim
> >> [    0.000000] percpu: Embedded 17 pages/cpu s30696 r8192 d30744 u6963=
2
> >> [    0.000000] Built 1 zonelists, mobility grouping on.  Total pages: =
15655
> >> [    0.000000] Kernel command line: rootwait root=3D/dev/vda ro consol=
e=3DttyS0 earlycon=3Dsbi
> >> [    0.000000] Dentry cache hash table entries: 8192 (order: 4, 65536 =
bytes, linear)
> >> [    0.000000] Inode-cache hash table entries: 4096 (order: 3, 32768 b=
ytes, linear)
> >> [    0.000000] mem auto-init: stack:off, heap alloc:off, heap free:off
> >> [    0.000000] Virtual kernel memory layout:
> >> [    0.000000]       fixmap : 0xffffffcefee00000 - 0xffffffceff000000 =
  (2048 kB)
> >> [    0.000000]       pci io : 0xffffffceff000000 - 0xffffffcf00000000 =
  (  16 MB)
> >> [    0.000000]      vmemmap : 0xffffffcf00000000 - 0xffffffcfffffffff =
  (4095 MB)
> >> [    0.000000]      vmalloc : 0xffffffd000000000 - 0xffffffdfffffffff =
  (65535 MB)
> >> [    0.000000]       lowmem : 0xffffffe000000000 - 0xffffffe003e00000 =
  (  62 MB)
> >> [    0.000000]       kernel : 0xffffffff80000000 - 0xffffffffffffffff =
  (2047 MB)
> >> [    0.000000] Memory: 52788K/63488K available (6184K kernel code, 888=
K rwdata, 1917K rodata, 294K init, 297K bss, 10700K reserved, 0K cma-reserv=
ed)
> >> [    0.000000] SLUB: HWalign=3D64, Order=3D0-3, MinObjects=3D0, CPUs=
=3D1, Nodes=3D1
> >> [    0.000000] rcu: Hierarchical RCU implementation.
> >> [    0.000000] rcu:     RCU restricting CPUs from NR_CPUS=3D8 to nr_cp=
u_ids=3D1.
> >> [    0.000000] rcu:     RCU debug extended QS entry/exit.
> >> [    0.000000]  Tracing variant of Tasks RCU enabled.
> >> [    0.000000] rcu: RCU calculated value of scheduler-enlistment delay=
 is 25 jiffies.
> >> [    0.000000] rcu: Adjusting geometry for rcu_fanout_leaf=3D16, nr_cp=
u_ids=3D1
> >> [    0.000000] NR_IRQS: 64, nr_irqs: 64, preallocated irqs: 0
> >> [    0.000000] riscv-intc: 64 local interrupts mapped
> >> [    0.000000] plic: plic@c000000: mapped 53 interrupts with 1 handler=
s for 2 contexts.
> >> ...
> >> Welcome to Buildroot
> >> buildroot login: root
> >> # cat /proc/cpuinfo
> >> processor       : 0
> >> hart            : 0
> >> isa             : rv64imafdcsuh
> >> mmu             : sv48
> >>
> >> # file /bin/busybox
> >> /bin/busybox: setuid ELF 32-bit LSB shared object, UCB RISC-V, version=
 1 (SYSV), dynamically linked, interpreter /lib/ld-linux-riscv32-ilp32d.so.=
1, for GNU/Linux 5.15.0, stripped
> >> # ca[   78.386630] random: fast init done
> >> # cat /proc/meminfo
> >> MemTotal:          53076 kB
> >> MemFree:           40264 kB
> >> MemAvailable:      40244 kB
> >> Buffers:             236 kB
> >> Cached:             1560 kB
> >> SwapCached:            0 kB
> >> Active:             1700 kB
> >> Inactive:            516 kB
> >> Active(anon):         40 kB
> >> Inactive(anon):      424 kB
> >> Active(file):       1660 kB
> >> Inactive(file):       92 kB
> >> Unevictable:           0 kB
> >> Mlocked:               0 kB
> >> SwapTotal:             0 kB
> >> SwapFree:              0 kB
> >> Dirty:                 0 kB
> >> Writeback:             0 kB
> >> AnonPages:           444 kB
> >> Mapped:             1188 kB
> >> Shmem:                44 kB
> >> KReclaimable:        952 kB
> >> Slab:               5744 kB
> >> SReclaimable:        952 kB
> >> SUnreclaim:         4792 kB
> >> KernelStack:         624 kB
> >> PageTables:          156 kB
> >> NFS_Unstable:          0 kB
> >> Bounce:                0 kB
> >> WritebackTmp:          0 kB
> >> CommitLimit:       26536 kB
> >> Committed_AS:       1748 kB
> >> VmallocTotal:   67108863 kB
> >> VmallocUsed:         652 kB
> >> VmallocChunk:          0 kB
> >> Percpu:               80 kB
> >> #
> >>
> >>  - Run rv32 with rv32 rootfs:
> >>    $ ./build/qemu-system-riscv32 -cpu rv32 -M virt -m 64m -nographic -=
bios qemu_riscv32_virt_defconfig/images/fw_jump.bin -kernel build-rv32/Imag=
e -drive file qemu_riscv32_virt_defconfig/images/rootfs.ext2,format=3Draw,i=
d=3Dhd0 -device virtio-blk-device,drive=3Dhd0 -append "rootwait root=3D/dev=
/vda ro console=3DttyS0 earlycon=3Dsbi" -netdev user,id=3Dnet0 -device virt=
io-net-device,netdev=3Dnet0
> >>
> >> QEMU emulator version 6.2.50 (v6.2.0-29-g196d7182c8)
> >> OpenSBI v0.9
> >> [    0.000000] Linux version 5.16.0-rc6-00017-g750f87086bdd-dirty (guo=
ren@guoren-Z87-HD3) (riscv32-buildroot-linux-gnu-gcc.br_real (Buildroot 202=
1.11-201-g7600ca7960-dirty) 10.3.0, GNU ld (GNU Binutils) 2.36.1) #7 SMP Tu=
e Dec 28 21:02:21 CST 2021
> >> [    0.000000] OF: fdt: Ignoring memory range 0x80000000 - 0x80400000
> >> [    0.000000] Machine model: riscv-virtio,qemu
> >> [    0.000000] earlycon: sbi0 at I/O port 0x0 (options '')
> >> [    0.000000] printk: bootconsole [sbi0] enabled
> >> [    0.000000] efi: UEFI not found.
> >> [    0.000000] Zone ranges:
> >> [    0.000000]   Normal   [mem 0x0000000080400000-0x0000000083ffffff]
> >> [    0.000000] Movable zone start for each node
> >> [    0.000000] Early memory node ranges
> >> [    0.000000]   node   0: [mem 0x0000000080400000-0x0000000083ffffff]
> >> [    0.000000] Initmem setup node 0 [mem 0x0000000080400000-0x00000000=
83ffffff]
> >> [    0.000000] SBI specification v0.2 detected
> >> [    0.000000] SBI implementation ID=3D0x1 Version=3D0x9
> >> [    0.000000] SBI TIME extension detected
> >> [    0.000000] SBI IPI extension detected
> >> [    0.000000] SBI RFENCE extension detected
> >> [    0.000000] SBI v0.2 HSM extension detected
> >> [    0.000000] riscv: ISA extensions acdfhimsu
> >> [    0.000000] riscv: ELF capabilities acdfim
> >> [    0.000000] percpu: Embedded 12 pages/cpu s16600 r8192 d24360 u4915=
2
> >> [    0.000000] Built 1 zonelists, mobility grouping on.  Total pages: =
15240
> >> [    0.000000] Kernel command line: rootwait root=3D/dev/vda ro consol=
e=3DttyS0 earlycon=3Dsbi
> >> [    0.000000] Dentry cache hash table entries: 8192 (order: 3, 32768 =
bytes, linear)
> >> [    0.000000] Inode-cache hash table entries: 4096 (order: 2, 16384 b=
ytes, linear)
> >> [    0.000000] mem auto-init: stack:off, heap alloc:off, heap free:off
> >> [    0.000000] Virtual kernel memory layout:
> >> [    0.000000]       fixmap : 0x9dc00000 - 0x9e000000   (4096 kB)
> >> [    0.000000]       pci io : 0x9e000000 - 0x9f000000   (  16 MB)
> >> [    0.000000]      vmemmap : 0x9f000000 - 0x9fffffff   (  15 MB)
> >> [    0.000000]      vmalloc : 0xa0000000 - 0xbfffffff   ( 511 MB)
> >> [    0.000000]       lowmem : 0xc0000000 - 0xc3c00000   (  60 MB)
> >> [    0.000000] Memory: 51924K/61440K available (6117K kernel code, 695=
K rwdata, 1594K rodata, 255K init, 241K bss, 9516K reserved, 0K cma-reserve=
d)
> >> [    0.000000] SLUB: HWalign=3D64, Order=3D0-3, MinObjects=3D0, CPUs=
=3D1, Nodes=3D1
> >> [    0.000000] rcu: Hierarchical RCU implementation.
> >> [    0.000000] rcu:     RCU restricting CPUs from NR_CPUS=3D8 to nr_cp=
u_ids=3D1.
> >> [    0.000000] rcu:     RCU debug extended QS entry/exit.
> >> [    0.000000]  Tracing variant of Tasks RCU enabled.
> >> [    0.000000] rcu: RCU calculated value of scheduler-enlistment delay=
 is 25 jiffies.
> >> [    0.000000] rcu: Adjusting geometry for rcu_fanout_leaf=3D16, nr_cp=
u_ids=3D1
> >> [    0.000000] NR_IRQS: 64, nr_irqs: 64, preallocated irqs: 0
> >> [    0.000000] riscv-intc: 32 local interrupts mapped
> >> [    0.000000] plic: plic@c000000: mapped 53 interrupts with 1 handler=
s for 2 contexts.
> >> ...
> >> Welcome to Buildroot
> >> buildroot login: root
> >> # cat /proc/cpuinfo
> >> processor       : 0
> >> hart            : 0
> >> isa             : rv32imafdcsuh
> >> mmu             : sv32
> >>
> >> # file /bin/busybox
> >> /bin/busybox: setuid ELF 32-bit LSB shared object, UCB RISC-V, version=
 1 (SYSV), dynamically linked, interpreter /lib/ld-linux-riscv32-ilp32d.so.=
1, for GNU/Linux 5.15.0, stripped
> >> [   79.320589] random: fast init done
> >> # cat /proc/meminfo
> >> MemTotal:          52176 kB
> >> MemFree:           41012 kB
> >> MemAvailable:      42176 kB
> >> Buffers:             644 kB
> >> Cached:             2724 kB
> >> SwapCached:            0 kB
> >> Active:             3128 kB
> >> Inactive:            752 kB
> >> Active(anon):         40 kB
> >> Inactive(anon):      516 kB
> >> Active(file):       3088 kB
> >> Inactive(file):      236 kB
> >> Unevictable:           0 kB
> >> Mlocked:               0 kB
> >> SwapTotal:             0 kB
> >> SwapFree:              0 kB
> >> Dirty:                 4 kB
> >> Writeback:             0 kB
> >> AnonPages:           556 kB
> >> Mapped:             2172 kB
> >> Shmem:                44 kB
> >> KReclaimable:        656 kB
> >> Slab:               3684 kB
> >> SReclaimable:        656 kB
> >> SUnreclaim:         3028 kB
> >> KernelStack:         312 kB
> >> PageTables:           88 kB
> >> NFS_Unstable:          0 kB
> >> Bounce:                0 kB
> >> WritebackTmp:          0 kB
> >> CommitLimit:       26088 kB
> >> Committed_AS:       2088 kB
> >> VmallocTotal:     524287 kB
> >> VmallocUsed:          12 kB
> >> VmallocChunk:          0 kB
> >> Percpu:               60 kB
> >> #
> >>
> >>  Some conclusions:
> >>  - kernel statics:
> >>    64: Memory: 52788K/63488K available (6184K kernel code, 888K rwdata=
, 1917K rodata, 294K init, 297K bss, 10700K reserved)
> >>    32: Memory: 51924K/61440K available (6117K kernel code, 695K rwdata=
, 1594K rodata, 255K init, 241K bss,  9516K reserved)
> >>    rv32 better than rv64:                  1%               22%       =
    17%          13%        19%         11%
> >>    The code size is very similar, but data size rv32 would be better.
> >>
> >>  - rv32 kernel runtime KernelStack, Slab... are smaller,
> >>    rv64: MemTotal: 53076 kB,        MemFree: 40264 kB
> >>    rv32: MemTotal: 52176 + 2048 kB, MemFree: 41012  + 2048 kB
> >>    rv32 better than rv64:       2%                         6%
> >>
> >>    (Because opensbi problem, we could add another 2MB for rv32.)
> >>    Overall in 64MB memory situation, rv64-compat is 6% worse than rv32=
-native
> >>    at memory footprint. If the userspace memory usage increases, I thi=
nk
> >>    the gap will be further reduced.
> >>
> >> Changes in v12:
> >>  - Rebase on 5.18-rc1
> >>  - Fixup compile conflicts with 5.18-rc1
> >>  - Fixup $(srctree) =3D=3D $(objtree) compile error reported by Nathan
> >>
> >> Changes in v11:
> >>  - Using arch instead of kconfig for commit subject by Masahiro Yamada
> >>
> >> Changes in v10:
> >>  - Fixup arm64 compile error with compat_statfs definition
> >>  - Fixup compat_sys_fadvise64_64 function arguments error cause ltp fa=
ilure
> >>
> >> Changes in v9:
> >>  - Fixup rv32 call rv64 segment fault
> >>  - Ready for 5.18
> >>
> >> Changes in v8:
> >>  - Enhanced elf_check_arch with EI_CLASS
> >>  - Fixup SR_UXL doesn't exist in CONFIG_32BIT
> >>  - Add Tested-by with Heiko
> >>  - Update qemu compile tips with upstream repo
> >>
> >> Changes in v7:
> >>  - Re-construct compat_vdso/Makefile
> >>  - Fixup disable COMPAT compile error by csr.h's macro.
> >>  - Optimize coding convention for lo/hi in compat.h
> >>
> >> Changes in v6:
> >>  - Rebase on linux-5.17-rc5
> >>  - Optimize hw capability check for elf
> >>  - Optimize comment in thread_info.h
> >>  - Optimize start_thread with SR_UXL setting
> >>  - Optimize vdso.c with direct panic
> >>
> >> Changes in v5:
> >>  - Rebase on linux-5.17-rc2
> >>  - Include consolidate the fcntl patches by Christoph Hellwig
> >>  - Remove F_GETLK64/F_SETLK64/F_SETLKW64 from asm/compat.h
> >>  - Change COMPAT_RLIM_INFINITY from 0x7fffffff to 0xffffffff
> >>  - Bring back "Add hw-cap detect in setup_arch patch" in v1
> >>
> >> Changes in v4:
> >>  - Rebase on linux-5.17-rc1
> >>  - Optimize compat_sys_call_table implementation with Arnd's advice
> >>  - Add reviewed-by for Arnd. Thx :)
> >>  - Remove FIXME comment in elf.h
> >>  - Optimize Cleanup duplicate definitions in compat.h with Arnd's advi=
ce
> >>
> >> Changes in v3:
> >>  - Rebase on newest master (pre linux-5.17-rc1)
> >>  - Using newest qemu version v7 for test
> >>  - Remove fcntl common modification
> >>  - Fixup SET_PERSONALITY in elf.h by Arnd
> >>  - Fixup KVM Kconfig
> >>  - Update Acked-by & Reviewed-by
> >>
> >> Changes in v2:
> >>  - Add __ARCH_WANT_COMPAT_STAT suggested
> >>  - Cleanup fcntl compatduplicate definitions
> >>  - Cleanup compat.h
> >>  - Move rv32_defconfig into Makefile
> >>  - Fixup rv64 rootfs boot failed, remove hw_compat_mode_detect
> >>  - Move SYSVIPC_COMPAT into init/Kconfig
> >>  - Simplify compat_elf_check
> >>
> >> Christoph Hellwig (3):
> >>   uapi: simplify __ARCH_FLOCK{,64}_PAD a little
> >>   uapi: always define F_GETLK64/F_SETLK64/F_SETLKW64 in fcntl.h
> >>   compat: consolidate the compat_flock{,64} definition
> >>
> >> Guo Ren (17):
> >>   arch: Add SYSVIPC_COMPAT for all architectures
> >>   fs: stat: compat: Add __ARCH_WANT_COMPAT_STAT
> >>   asm-generic: compat: Cleanup duplicate definitions
> >>   syscalls: compat: Fix the missing part for __SYSCALL_COMPAT
> >>   riscv: Fixup difference with defconfig
> >>   riscv: compat: Add basic compat data type implementation
> >>   riscv: compat: Support TASK_SIZE for compat mode
> >>   riscv: compat: syscall: Add compat_sys_call_table implementation
> >>   riscv: compat: syscall: Add entry.S implementation
> >>   riscv: compat: process: Add UXL_32 support in start_thread
> >>   riscv: compat: Add elf.h implementation
> >>   riscv: compat: Add hw capability check for elf
> >>   riscv: compat: vdso: Add COMPAT_VDSO base code implementation
> >>   riscv: compat: vdso: Add setup additional pages implementation
> >>   riscv: compat: signal: Add rt_frame implementation
> >>   riscv: compat: ptrace: Add compat_arch_ptrace implement
> >>   riscv: compat: Add COMPAT Kbuild skeletal support
> >>
> >>  arch/arm64/Kconfig                            |   4 -
> >>  arch/arm64/include/asm/compat.h               |  93 +------
> >>  arch/arm64/include/asm/unistd.h               |   1 +
> >>  arch/mips/Kconfig                             |   5 -
> >>  arch/mips/include/asm/compat.h                |  41 +--
> >>  arch/mips/include/asm/unistd.h                |   2 +
> >>  arch/mips/include/uapi/asm/fcntl.h            |  30 +--
> >>  arch/parisc/Kconfig                           |   4 -
> >>  arch/parisc/include/asm/compat.h              |  45 +---
> >>  arch/parisc/include/asm/unistd.h              |   1 +
> >>  arch/powerpc/Kconfig                          |   5 -
> >>  arch/powerpc/include/asm/compat.h             |  50 +---
> >>  arch/powerpc/include/asm/unistd.h             |   1 +
> >>  arch/riscv/Kconfig                            |  19 ++
> >>  arch/riscv/Makefile                           |   9 +
> >>  arch/riscv/include/asm/compat.h               | 129 ++++++++++
> >>  arch/riscv/include/asm/csr.h                  |   7 +
> >>  arch/riscv/include/asm/elf.h                  |  50 +++-
> >>  arch/riscv/include/asm/mmu.h                  |   1 +
> >>  arch/riscv/include/asm/pgtable.h              |  13 +-
> >>  arch/riscv/include/asm/processor.h            |   6 +-
> >>  arch/riscv/include/asm/syscall.h              |   1 +
> >>  arch/riscv/include/asm/thread_info.h          |   1 +
> >>  arch/riscv/include/asm/unistd.h               |  11 +
> >>  arch/riscv/include/asm/vdso.h                 |   9 +
> >>  arch/riscv/include/uapi/asm/unistd.h          |   2 +-
> >>  arch/riscv/kernel/Makefile                    |   3 +
> >>  arch/riscv/kernel/compat_signal.c             | 242 +++++++++++++++++=
+
> >>  arch/riscv/kernel/compat_syscall_table.c      |  19 ++
> >>  arch/riscv/kernel/compat_vdso/.gitignore      |   2 +
> >>  arch/riscv/kernel/compat_vdso/Makefile        |  78 ++++++
> >>  arch/riscv/kernel/compat_vdso/compat_vdso.S   |   8 +
> >>  .../kernel/compat_vdso/compat_vdso.lds.S      |   3 +
> >>  arch/riscv/kernel/compat_vdso/flush_icache.S  |   3 +
> >>  .../compat_vdso/gen_compat_vdso_offsets.sh    |   5 +
> >>  arch/riscv/kernel/compat_vdso/getcpu.S        |   3 +
> >>  arch/riscv/kernel/compat_vdso/note.S          |   3 +
> >>  arch/riscv/kernel/compat_vdso/rt_sigreturn.S  |   3 +
> >>  arch/riscv/kernel/entry.S                     |  18 +-
> >>  arch/riscv/kernel/process.c                   |  37 +++
> >>  arch/riscv/kernel/ptrace.c                    |  87 ++++++-
> >>  arch/riscv/kernel/signal.c                    |  13 +-
> >>  arch/riscv/kernel/sys_riscv.c                 |   6 +-
> >>  arch/riscv/kernel/vdso.c                      | 105 +++++---
> >>  arch/riscv/kernel/vdso/vdso.S                 |   6 +-
> >>  arch/s390/Kconfig                             |   3 -
> >>  arch/s390/include/asm/compat.h                |  99 +------
> >>  arch/s390/include/asm/unistd.h                |   1 +
> >>  arch/sparc/Kconfig                            |   5 -
> >>  arch/sparc/include/asm/compat.h               |  61 ++---
> >>  arch/sparc/include/asm/unistd.h               |   1 +
> >>  arch/x86/Kconfig                              |   4 -
> >>  arch/x86/include/asm/compat.h                 | 104 ++------
> >>  arch/x86/include/asm/unistd.h                 |   1 +
> >>  fs/open.c                                     |  24 ++
> >>  fs/read_write.c                               |  16 ++
> >>  fs/stat.c                                     |   2 +-
> >>  fs/sync.c                                     |   9 +
> >>  include/asm-generic/compat.h                  | 113 ++++++++
> >>  include/linux/compat.h                        |  68 +++++
> >>  include/uapi/asm-generic/fcntl.h              |  23 +-
> >>  include/uapi/asm-generic/unistd.h             |   4 +-
> >>  init/Kconfig                                  |   4 +
> >>  mm/fadvise.c                                  |  11 +
> >>  mm/readahead.c                                |   7 +
> >>  tools/include/uapi/asm-generic/fcntl.h        |  21 +-
> >>  tools/include/uapi/asm-generic/unistd.h       |   4 +-
> >>  67 files changed, 1206 insertions(+), 563 deletions(-)
> >>  create mode 100644 arch/riscv/include/asm/compat.h
> >>  create mode 100644 arch/riscv/kernel/compat_signal.c
> >>  create mode 100644 arch/riscv/kernel/compat_syscall_table.c
> >>  create mode 100644 arch/riscv/kernel/compat_vdso/.gitignore
> >>  create mode 100644 arch/riscv/kernel/compat_vdso/Makefile
> >>  create mode 100644 arch/riscv/kernel/compat_vdso/compat_vdso.S
> >>  create mode 100644 arch/riscv/kernel/compat_vdso/compat_vdso.lds.S
> >>  create mode 100644 arch/riscv/kernel/compat_vdso/flush_icache.S
> >>  create mode 100755 arch/riscv/kernel/compat_vdso/gen_compat_vdso_offs=
ets.sh
> >>  create mode 100644 arch/riscv/kernel/compat_vdso/getcpu.S
> >>  create mode 100644 arch/riscv/kernel/compat_vdso/note.S
> >>  create mode 100644 arch/riscv/kernel/compat_vdso/rt_sigreturn.S
> >>
> >> --
> >> 2.25.1
> >>


--=20
Best Regards
 Guo Ren

ML: https://lore.kernel.org/linux-csky/