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Message-ID: <CAJF2gTR995JG_fyhSx2q5dO3YkBg-zTc8qstOZNjZ8qmpT1n1w@mail.gmail.com>
Date: Sat, 21 May 2022 02:18:46 +0800
From: Guo Ren <guoren@...nel.org>
To: Palmer Dabbelt <palmer@...belt.com>
Cc: Arnd Bergmann <arnd@...db.de>,
Greg KH <gregkh@...uxfoundation.org>,
Christoph Hellwig <hch@....de>,
Nathan Chancellor <nathan@...nel.org>,
Naresh Kamboju <naresh.kamboju@...aro.org>,
linux-arch <linux-arch@...r.kernel.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
linux-riscv <linux-riscv@...ts.infradead.org>,
linux-s390 <linux-s390@...r.kernel.org>,
sparclinux <sparclinux@...r.kernel.org>,
linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
Parisc List <linux-parisc@...r.kernel.org>,
"open list:BROADCOM NVRAM DRIVER" <linux-mips@...r.kernel.org>,
Linux ARM <linux-arm-kernel@...ts.infradead.org>,
"the arch/x86 maintainers" <x86@...nel.org>,
Heiko Stübner <heiko@...ech.de>,
Guo Ren <guoren@...ux.alibaba.com>
Subject: Re: [PATCH V12 00/20] riscv: Add COMPAT mode support for 64BIT
On Fri, May 20, 2022 at 1:50 AM Palmer Dabbelt <palmer@...belt.com> wrote:
>
> On Tue, 05 Apr 2022 00:12:54 PDT (-0700), guoren@...nel.org wrote:
> > From: Guo Ren <guoren@...ux.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=qemu_riscv32_virt_defconfig
> > $ make -C qemu_riscv32_virt_defconfig
> > $ make qemu_riscv64_virt_defconfig O=qemu_riscv64_virt_defconfig
> > $ make -C qemu_riscv64_virt_defconfig
> > (Got fw_jump.bin & rootfs.ext2 in qemu_riscvXX_virt_defconfig/images)
> >
> > - Prepare Linux rv32 & rv64 Image
> > $ git clone git@...hub.com:c-sky/csky-linux.git -b riscv_compat_v12 linux
> > $ cd linux
> > $ echo "CONFIG_STRICT_KERNEL_RWX=n" >> arch/riscv/configs/defconfig
> > $ echo "CONFIG_STRICT_MODULE_RWX=n" >> arch/riscv/configs/defconfig
> > $ make ARCH=riscv CROSS_COMPILE=riscv32-buildroot-linux-gnu- O=../build-rv32/ rv32_defconfig
> > $ make ARCH=riscv CROSS_COMPILE=riscv32-buildroot-linux-gnu- O=../build-rv32/ Image
> > $ make ARCH=riscv CROSS_COMPILE=riscv64-buildroot-linux-gnu- O=../build-rv64/ defconfig
> > $ make ARCH=riscv CROSS_COMPILE=riscv64-buildroot-linux-gnu- O=../build-rv64/ Image
> >
> > - Prepare Qemu:
> > $ git clone https://gitlab.com/qemu-project/qemu.git -b master linux
> > $ cd qemu
> > $ ./configure --target-list="riscv64-softmmu riscv32-softmmu"
> > $ make
> >
> > Now let's compare rv64-compat with rv32-native memory footprint with almost 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/Image -drive file qemu_riscv32_virt_defconfig/images/rootfs.ext2,format=raw,id=hd0 -device virtio-blk-device,drive=hd0 -append "rootwait root=/dev/vda ro console=ttyS0 earlycon=sbi" -netdev user,id=net0 -device virtio-net-device,netdev=net0
> >
> > 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 (guoren@...ren-Z87-HD3) (riscv64-unknown-linux-gnu-gcc (GCC) 10.2.0, GNU ld (GNU 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 0x0000000080200000-0x0000000083ffffff]
> > [ 0.000000] SBI specification v0.2 detected
> > [ 0.000000] SBI implementation ID=0x1 Version=0x9
> > [ 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 u69632
> > [ 0.000000] Built 1 zonelists, mobility grouping on. Total pages: 15655
> > [ 0.000000] Kernel command line: rootwait root=/dev/vda ro console=ttyS0 earlycon=sbi
> > [ 0.000000] Dentry cache hash table entries: 8192 (order: 4, 65536 bytes, linear)
> > [ 0.000000] Inode-cache hash table entries: 4096 (order: 3, 32768 bytes, 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, 888K rwdata, 1917K rodata, 294K init, 297K bss, 10700K reserved, 0K cma-reserved)
> > [ 0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
> > [ 0.000000] rcu: Hierarchical RCU implementation.
> > [ 0.000000] rcu: RCU restricting CPUs from NR_CPUS=8 to nr_cpu_ids=1.
> > [ 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=16, nr_cpu_ids=1
> > [ 0.000000] NR_IRQS: 64, nr_irqs: 64, preallocated irqs: 0
> > [ 0.000000] riscv-intc: 64 local interrupts mapped
> > [ 0.000000] plic: plic@...0000: mapped 53 interrupts with 1 handlers 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/Image -drive file qemu_riscv32_virt_defconfig/images/rootfs.ext2,format=raw,id=hd0 -device virtio-blk-device,drive=hd0 -append "rootwait root=/dev/vda ro console=ttyS0 earlycon=sbi" -netdev user,id=net0 -device virtio-net-device,netdev=net0
> >
> > 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 (guoren@...ren-Z87-HD3) (riscv32-buildroot-linux-gnu-gcc.br_real (Buildroot 2021.11-201-g7600ca7960-dirty) 10.3.0, GNU ld (GNU Binutils) 2.36.1) #7 SMP Tue 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 0x0000000080400000-0x0000000083ffffff]
> > [ 0.000000] SBI specification v0.2 detected
> > [ 0.000000] SBI implementation ID=0x1 Version=0x9
> > [ 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 u49152
> > [ 0.000000] Built 1 zonelists, mobility grouping on. Total pages: 15240
> > [ 0.000000] Kernel command line: rootwait root=/dev/vda ro console=ttyS0 earlycon=sbi
> > [ 0.000000] Dentry cache hash table entries: 8192 (order: 3, 32768 bytes, linear)
> > [ 0.000000] Inode-cache hash table entries: 4096 (order: 2, 16384 bytes, 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, 695K rwdata, 1594K rodata, 255K init, 241K bss, 9516K reserved, 0K cma-reserved)
> > [ 0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
> > [ 0.000000] rcu: Hierarchical RCU implementation.
> > [ 0.000000] rcu: RCU restricting CPUs from NR_CPUS=8 to nr_cpu_ids=1.
> > [ 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=16, nr_cpu_ids=1
> > [ 0.000000] NR_IRQS: 64, nr_irqs: 64, preallocated irqs: 0
> > [ 0.000000] riscv-intc: 32 local interrupts mapped
> > [ 0.000000] plic: plic@...0000: mapped 53 interrupts with 1 handlers 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 think
> > the gap will be further reduced.
> >
> > Changes in v12:
> > - Rebase on 5.18-rc1
> > - Fixup compile conflicts with 5.18-rc1
> > - Fixup $(srctree) == $(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 failure
> >
> > 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 advice
> >
> > 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_offsets.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
>
> Thanks.
>
> This touches a bunch of other trees, which I try to avoid without the
> relevant acks and such. In this case I'm OK taking it because Arnd and
> Christoph have written/reviewed/ack'd so much of it, and because some
> autobuilders found build issues (and thus I'm assuming there aren't any
> more).
>
> There's been a bunch of versions of this and I'm pretty sure I've said
> this a handful of times without any comments. Now that it's passing all
> my tests and I'm not getting any autobuilding breakages I've put it on
> for-next, but happy to try and spin up some sort of multi-tree merge if
Sounds good to me. Thx.
> that's an issue for anyone.
--
Best Regards
Guo Ren
ML: https://lore.kernel.org/linux-csky/
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