Re: [PATCH] riscv: asm/gdb_xml.h: use __maybe_used to make W=1 warnings go away

On Thu, Jul 2, 2020 at 2:48 AM Pierre-Louis Bossart wrote: > > 0day/kbuild reports warnings with the ASoC codecs compiled with W=1. > > In file included from arch/riscv/include/asm/kgdb.h:109, > from include/linux/kgdb.h:20, > from include/linux/fb.h:5, >

Re: [PATCH] riscv: Fixup __vdso_gettimeofday broke dynamic ftrace

t; > > > CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE) -Os $(CC_FLAGS_SCS) > > > > - CC_FLAGS_SCS is ShadowCallStack feature in Clang and only > >implemented for arm64, no use for riscv. > > > > The bug comes from the following commit: > > > &g

Re: riscv64-linux-objcopy: 'arch/riscv/kernel/vdso/vdso.so.dbg': No such file

On Sat, Jun 20, 2020 at 6:11 PM kernel test robot wrote: > > Hi Vincent, > > FYI, the error/warning still remains. > I have found out the root cause of this error and I will send a patch to fix it in a couple of days. Thanks for pointing out my mistake. > tree: https://git.kernel.org/pub/scm/li

Re: [GIT PULL] RISC-V Patches for the 5.8 Merge Window, Part 1

; >> > >> Damien Le Moal (1): > >> riscv: K210: Update defconfig > >> > >> Palmer Dabbelt (5): > >> riscv: Allow device trees to be built into the kernel > >> ri

Re: [PATCH 4/4] riscv: remove the switch statement in do_trap_break()

Sorry, I missed the comment. Christoph's suggestion is also good to me. I will modify it as you suggested. Thanks On Tue, Oct 8, 2019 at 12:31 AM Paul Walmsley wrote: > > On Mon, 7 Oct 2019, Christoph Hellwig wrote: > > > On Mon, Oct 07, 2019 at 09:08:23AM -0700, Paul Walmsley wrote: > > >

Re: [PATCH 2/4] rsicv: avoid sending a SIGTRAP to a user thread trapped in WARN()

On Sat, Sep 28, 2019 at 6:56 AM Christoph Hellwig wrote: > > Oh and s/rsicv/riscv/ in the subject, please. Oh! Thank you for finding this typo. I will correct it.

[PATCH 1/4] riscv: avoid kernel hangs when trapped in BUG()

deal with the break exception as the type of break is BUG_TRAP_TYPE_BUG. Signed-off-by: Vincent Chen --- arch/riscv/kernel/traps.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/arch/riscv/kernel/traps.c b/arch/riscv/kernel/traps.c index 424eb72d56b1..055a937aca70 100644

[PATCH 0/4] riscv: correct the do_trap_break()

ebreak, it may cause the kernel thread to be stuck in the ebreak instruction. This patch set will solve the above problems by adjusting the implementations of the do_trap_break(). Vincent Chen (4): riscv: avoid kernel hangs when trapped in BUG() rsicv: avoid sending a SIGTRAP to a user

[PATCH 2/4] rsicv: avoid sending a SIGTRAP to a user thread trapped in WARN()

On RISC-V, when the kernel runs code on behalf of a user thread, and the kernel executes a WARN() or WARN_ON(), the user thread will be sent a bogus SIGTRAP. Fix the RISC-V kernel code to not send a SIGTRAP when a WARN()/WARN_ON() is executed. Signed-off-by: Vincent Chen --- arch/riscv/kernel

[PATCH 4/4] riscv: remove the switch statement in do_trap_break()

To make the code more straightforward, replacing the switch statement with if statement. Suggested-by: Paul Walmsley Signed-off-by: Vincent Chen --- arch/riscv/kernel/traps.c | 23 --- 1 file changed, 12 insertions(+), 11 deletions(-) diff --git a/arch/riscv/kernel/traps.c

[PATCH 3/4] riscv: Correct the handling of unexpected ebreak in do_trap_break()

the trapped process only when the ebreak is in userspace. Signed-off-by: Vincent Chen --- arch/riscv/kernel/traps.c | 7 +++ 1 file changed, 3 insertions(+), 4 deletions(-) diff --git a/arch/riscv/kernel/traps.c b/arch/riscv/kernel/traps.c index 82f42a55451e..dd13bc90aeb6 100644 --- a/arch

[PATCH] riscv: Avoid interrupts being erroneously enabled in handle_exception()

be taken when interrupts are enabled. In this case, it may cause a deadlock problem if the rq.lock is locked again in the timer ISR. Hence, the handle_exception() can only enable interrupts when the state of sstatus.SPIE is 1. This patch is tested on HiFive Unleashed board. Signed-off-by: Vincent

Re: [PATCH v2 2/2] riscv: Make __fstate_clean() work correctly.

On Thu, Aug 15, 2019 at 6:17 AM Andreas Schwab wrote: > > On Aug 14 2019, Palmer Dabbelt wrote: > > > On Wed, 14 Aug 2019 13:32:50 PDT (-0700), Paul Walmsley wrote: > >> On Wed, 14 Aug 2019, Vincent Chen wrote: > >> > >>> Make the __fstate_clea

[PATCH v2 1/2] riscv: Correct the initialized flow of FP register

state is set to SR_FS_INITIAL in start_trhead(). Signed-off-by: Vincent Chen Reviewed-by: Anup Patel Reviewed-by: Christoph Hellwig --- arch/riscv/include/asm/switch_to.h | 6 ++ arch/riscv/kernel/process.c| 11 +-- 2 files changed, 15 insertions(+), 2 deletions(-) dif

[PATCH v2 2/2] riscv: Make __fstate_clean() work correctly.

Make the __fstate_clean() function correctly set the state of sstatus.FS in pt_regs to SR_FS_CLEAN. Fixes: 7db91e5 ("RISC-V: Task implementation") Cc: linux-stable Signed-off-by: Vincent Chen Reviewed-by: Anup Patel Reviewed-by: Christoph Hellwig --- arch/riscv/include/asm/switc

[PATCH v2 0/2] riscv: Correct the initialized flow of FP and __fstate_clean()

rectly set the state of sstatus.FS to SR_FS_CLEAN. These problems will be solved in this patch set. Changes since v1: - Remove unneeded braces - Remove unneeded ifdef condition - Make the correction for __fstate_clean() be a RC fix Vincent Chen (2): riscv: Correct the initialized flow of FP re

Re: [PATCH 2/2] riscv: Make __fstate_clean() can work correctly.

Reviewed-by: Christoph Hellwig Thanks for your comments Regards, Vincent Chen

Re: [PATCH 2/2] riscv: Make __fstate_clean() can work correctly.

On Thu, Aug 8, 2019 at 6:17 PM Anup Patel wrote: > > On Thu, Aug 8, 2019 at 1:30 PM Vincent Chen wrote: > > > > Make the __fstate_clean() function can correctly set the > > state of sstatus.FS in pt_regs to SR_FS_CLEAN. > > > > Tested on both QEMU an

Re: [PATCH 1/2] riscv: Correct the initialized flow of FP register

rogram. > > + */ > > + fstate_restore(current, regs); > > +#endif > > fstate_restore has a no-op stub for the !CONFIG_FPU case, so the ifdef > here is not needed. > You are right. I will remove the Ifdef condition. > Otherwise this looks good to me: > > Reviewed-by: Christoph Hellwig Thanks for your comments. Regards, Vincent Chen

Re: [PATCH 1/2] riscv: Correct the initialized flow of FP register

On Thu, Aug 8, 2019 at 11:50 PM Paul Walmsley wrote: > > On Thu, 8 Aug 2019, Anup Patel wrote: > > > On Thu, Aug 8, 2019 at 1:30 PM Vincent Chen wrote: > > > > > > +static inline void fstate_off(struct task_struct *task, > > > +

[PATCH 2/2] riscv: Make __fstate_clean() can work correctly.

Make the __fstate_clean() function can correctly set the state of sstatus.FS in pt_regs to SR_FS_CLEAN. Tested on both QEMU and HiFive Unleashed using BBL + Linux. Signed-off-by: Vincent Chen --- arch/riscv/include/asm/switch_to.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff

[PATCH 1/2] riscv: Correct the initialized flow of FP register

state is set to SR_FS_INITIAL in start_trhead(). Tested on both QEMU and HiFive Unleashed using BBL + Linux. Signed-off-by: Vincent Chen --- arch/riscv/include/asm/switch_to.h | 6 ++ arch/riscv/kernel/process.c| 13 +++-- 2 files changed, 17 insertions(+), 2 deletions

[PATCH 0/2] riscv: Correct the initialized flow of FP and __fstate_clean()

rectly set the state of sstatus.FS to SR_FS_CLEAN. These problems will be solved in this patch set. Vincent Chen (2): riscv: Correct the initialized flow of FP register riscv: Make __fstate_clean() can work correctly. arch/riscv/include/asm/switch_to.h | 8 +++- arch/riscv/kernel/pro

[PATCH v2 3/3] math-emu: Use statement expressions to fix Wshift-count-overflow warning

To avoid "shift count >= width of type" warning, using statement expressions to implement the conditional controlling before constant shift The modification in op-2.h is taken from the glibc commit 'sysdeps/unix/sysv/lin ("fe0b1e854ad32")'. Signed-off-by: Vincent

[PATCH v2 0/3] nds32: Prevent FPU emulator from incorrectly modifying IEX status

data type so that many Wshift-count-overflow warning is issued. These warnings are fixed in the 3rd patch. Vincent Chen (3): nds32: Avoid IEX status being incorrectly modified nds32: add new emulations for floating point instruction math-emu: Use statement expressions to fix Wshift-count

[PATCH v2 2/3] nds32: add new emulations for floating point instruction

patch adds the emulations of such floating point instructions. Signed-off-by: Vincent Chen --- Changes in v2 - No changes arch/nds32/include/asm/fpuemu.h | 12 arch/nds32/math-emu/Makefile|5 +++- arch/nds32/math-emu/fd2si.c | 30 arch/nds32/math

[PATCH v2 1/3] nds32: Avoid IEX status being incorrectly modified

$fpcsr be raised in each denormalized output handling, the IEX trap shall be always enabled. Signed-off-by: Vincent Chen --- Changes in v2 - No changes arch/nds32/include/asm/bitfield.h|2 +- arch/nds32/include/asm/fpu.h |2 +- arch/nds32/include/asm

[PATCH 2/2] nds32: add new emulations for floating point instruction

patch adds the emulations of such floating point instructions. Signed-off-by: Vincent Chen --- arch/nds32/include/asm/fpuemu.h | 12 arch/nds32/math-emu/Makefile|5 +++- arch/nds32/math-emu/fd2si.c | 30 arch/nds32/math-emu/fd2siz.c| 30

[PATCH 1/2] nds32: Avoid IEX status being incorrectly modified

$fpcsr be raised in each denormalized output handling, the IEX trap shall be always enabled. Signed-off-by: Vincent Chen --- arch/nds32/include/asm/bitfield.h|2 +- arch/nds32/include/asm/fpu.h |2 +- arch/nds32/include/asm/syscalls.h|2 +- arch

[PATCH 0/2] nds32: Prevent FPU emulator from incorrectly modifying IEX status

sufficient when IEx Trap is enabled because some floating point instructions only issue inexact exception. The 2nd patch adds the emulations of such floating point instructions. Vincent Chen (2): nds32: enable IEX trap too when kernel supports denormalized output nds32: add new emulations for

[PATCH v2 3/3] riscv: Support BUG() in kernel module

pc < VMALLOC_START. Signed-off-by: Vincent Chen --- arch/riscv/kernel/traps.c |2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/arch/riscv/kernel/traps.c b/arch/riscv/kernel/traps.c index 0cd0137..9551388 100644 --- a/arch/riscv/kernel/traps.c +++ b/arch/riscv/kernel/traps.c @@

[PATCH v2 0/3] riscv: Support trap-based WARN() and fix bug in do_trap_break

echanism in is_valid_bugaddr(bugaddr) to think that the trap triggered by "c.ebreak" occurs in an invalidate bug address. This patch set will add "c.ebreak" into the check mechanism. In addition, BUG() is also unable to work in the kernel module due to an inappropriate condition in

[PATCH v2 1/3] riscv: support trap-based WARN()

The WARN() related function will trigger a debug exception. This can help developers to analyze the cause of WARN() because if the debugger is connected, the control flow will be transferred to debugging environment. Signed-off-by: Vincent Chen --- arch/riscv/include/asm/bug.h | 28

[PATCH v2 2/3] riscv: Add the support for c.ebreak check in is_valid_bugaddr()

s possibly erroneous because if C extension is supported, the expected trap instruction "ebreak" is possibly translated to "c.ebreak" by the assembler. Therefore, it requires a mechanism to distinguish the length of the instruction in $spec and compare it to the correct trap i

Re: [PATCH 08/14] Move EM_NDS32 to uapi/linux/elf-em.h

is required to extend > the generic ptrace API with PTRACE_GET_SYSCALL_INFO request. > > Acked-by: Paul Moore > Cc: Greentime Hu > Cc: Vincent Chen > Cc: Elvira Khabirova > Cc: Eugene Syromyatnikov > Cc: Oleg Nesterov > Cc: Andy Lutomirski > Cc: linux-au..

Re: [PATCH 0/3] riscv: Fix debug instruction check and support trap-based WARN()

e due to an inappropriated condition in is_valid_bugaddr(). > > This issue will be fixed in this patchset. Finally, this patchset enables > > WARN() related functions to trap the code to help developers debug it. > > > > > > > > > > > > Vincent Chen (3): > &g

Re: [PATCH 09/14] nds32: define syscall_get_arch()

end the generic > ptrace API with PTRACE_GET_SYSCALL_INFO request. > > Acked-by: Paul Moore > Cc: Elvira Khabirova > Cc: Eugene Syromyatnikov > Cc: Greentime Hu > Cc: Vincent Chen > Cc: Oleg Nesterov > Cc: Andy Lutomirski > Cc: linux-au...@redhat.com > Signed-

[PATCH 1/3] riscv: Add the support for c.ebreak check in is_valid_bugaddr()

die() like BUG() when the trap type is BUG_TRAP_TYPE_WARN because currently the WARN() does not trigger any trap exception. Signed-off-by: Vincent Chen --- arch/riscv/include/asm/bug.h |7 ++- arch/riscv/kernel/traps.c|8 +--- 2 files changed, 11 insertions(+), 4 deletions(-) d

[PATCH 3/3] riscv: Make WARN() related functions able to trigger a trap exception

This can help developers to analyze the cause of WARN() because the control will be transferred to debugging environment if the debugger is connected. Signed-off-by: Vincent Chen --- arch/riscv/include/asm/bug.h | 27 ++- arch/riscv/kernel/traps.c| 19

[PATCH 2/3] riscv: Support BUG() in kernel module

pc < VMALLOC_START. Signed-off-by: Vincent Chen --- arch/riscv/kernel/traps.c |2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/arch/riscv/kernel/traps.c b/arch/riscv/kernel/traps.c index deae0e5..dee0e5e 100644 --- a/arch/riscv/kernel/traps.c +++ b/arch/riscv/kernel/traps.c @@

[PATCH 0/3] riscv: Fix debug instruction check and support trap-based WARN()

. Vincent Chen (3): riscv: Add the support for c.ebreak check in is_valid_bugaddr() riscv: Support BUG() in kernel module riscv: Make WARN() related functions able to trigger a trap exception

Re: [PATCH] RISC-V: Add _TIF_NEED_RESCHED check for kernel thread when CONFIG_PREEMPT=y

On Wed, Jan 23, 2019 at 02:58:51AM +0800, Palmer Dabbelt wrote: > On Wed, 02 Jan 2019 21:45:55 PST (-0800), li...@roeck-us.net wrote: > > On Thu, Jan 03, 2019 at 11:32:33AM +0800, Vincent Chen wrote: > >> The cond_resched() can be used to yield the CPU resource if > >

[PATCH] RISC-V: Add _TIF_NEED_RESCHED check for kernel thread when CONFIG_PREEMPT=y

. Signed-off-by: Vincent Chen --- arch/riscv/kernel/asm-offsets.c |1 + arch/riscv/kernel/entry.S | 18 +- 2 files changed, 18 insertions(+), 1 deletions(-) diff --git a/arch/riscv/kernel/asm-offsets.c b/arch/riscv/kernel/asm-offsets.c index 6a92a2f..dac9834 100644 --- a

Re: [PATCH v4 2/5] nds32: Support FP emulation

On Mon, Nov 26, 2018 at 06:18:01PM +0800, David Laight wrote: > From: Vincent Chen > > Sent: 26 November 2018 01:23 > > On Fri, Nov 23, 2018 at 06:53:37PM +0800, David Laight wrote: > > > From: Vincent Chen > > > > Sent: 22 November 2018 03:15 > > >

Re: [PATCH v4 2/5] nds32: Support FP emulation

On Fri, Nov 23, 2018 at 06:53:37PM +0800, David Laight wrote: > From: Vincent Chen > > Sent: 22 November 2018 03:15 > > > > The Andes FPU coprocessor does not support denormalized number handling. > > According to the specification, FPU generates a denorm input exce

[PATCH v4 3/5] nds32: support denormalized result through FP emulator

. Performance loss due to extra FPU exception 2. Need another scheme to control real underflow trap A new parameter, UDF_trap, which is belong to FPU context is used to control underflow trap. User can configure this feature via CONFIG_SUPPORT_DENORMAL_ARITHMETIC Signed-off-by: Vincent Chen

[PATCH v4 4/5] math-emu/op-2.h: Use statement expressions to prevent negative constant shift

This modification is quoted from glibc 'commit < sysdeps/unix/sysv/linux/sparc/sparc64/dl-procinfo.c: Moved to> (fe0b1e854ad32a69b260)' Signed-off-by: Vincent Chen --- include/math-emu/op-2.h | 97 ++ 1 files changed, 46 insertions(

[PATCH v4 2/5] nds32: Support FP emulation

required to meet requirement. Signed-off-by: Vincent Chen Signed-off-by: Nickhu --- arch/nds32/Makefile |1 + arch/nds32/include/asm/fpu.h|1 + arch/nds32/include/asm/fpuemu.h | 32 +++ arch/nds32/include/asm/nds32_fpu_inst.h | 109

[PATCH v4 5/5] math-emu/soft-fp.h: (_FP_ROUND_ZERO) cast 0 to void to fix warning

#x27; Signed-off-by: Vincent Chen --- include/math-emu/soft-fp.h |2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/include/math-emu/soft-fp.h b/include/math-emu/soft-fp.h index 3f284bc..5650c16 100644 --- a/include/math-emu/soft-fp.h +++ b/include/math-emu/soft-f

[PATCH v4 0/5] nds32 FPU port

CONFIG_LAYZ_FPU - Rename _switch() to _switch_fpu() - Store FPU context when kernel suspends - Modify the comments in code and patch Changes in v2: - Remove the initilzation for floating pointer register before entering to signal handler. Vincent Chen (5): nds32: nds32 FPU port nds32: Support FP

[PATCH v4 1/5] nds32: nds32 FPU port

This patch set contains basic components for supporting the nds32 FPU, such as exception handlers and context switch for FPU registers. By default, the lazy FPU scheme is supported and the user can configure it via CONFIG_LZAY_FPU. Signed-off-by: Vincent Chen --- arch/nds32/Kconfig

Re: [RFC 0/2] RISC-V: A proposal to add vendor-specific code

; >> > On Wed, 31 Oct 2018 04:16:10 PDT (-0700), a...@brainfault.org wrote: > >> > > On Wed, Oct 31, 2018 at 4:06 PM Vincent Chen > >> > > wrote: > >> > > > > >> > > > RISC-V permits each vendor to develop respective

Re: [RFC 0/2] RISC-V: A proposal to add vendor-specific code

On Fri, Nov 02, 2018 at 01:48:57AM +0800, Karsten Merker wrote: > On Wed, Oct 31, 2018 at 10:27:05AM -0700, Palmer Dabbelt wrote: > > On Wed, 31 Oct 2018 04:16:10 PDT (-0700), a...@brainfault.org wrote: > > > On Wed, Oct 31, 2018 at 4:06 PM Vincent Chen > > > wrote

[PATCH v3 5/5] math-emu/soft-fp.h: (_FP_ROUND_ZERO) cast 0 to void to fix warning

#x27; Signed-off-by: Vincent Chen --- include/math-emu/soft-fp.h |2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/include/math-emu/soft-fp.h b/include/math-emu/soft-fp.h index 3f284bc..5650c16 100644 --- a/include/math-emu/soft-fp.h +++ b/include/math-emu/soft-f

[PATCH v3 1/5] nds32: nds32 FPU port

This patch set contains basic components for supporting the nds32 FPU, such as exception handlers and context switch for FPU registers. By default, the lazy FPU scheme is supported and the user can configure it via CONFIG_LZAY_FPU. Signed-off-by: Vincent Chen --- arch/nds32/Kconfig

[PATCH v3 4/5] math-emu/op-2.h: Use statement expressions to prevent negative constant shift

This modification is quoted from glibc 'commit < sysdeps/unix/sysv/linux/sparc/sparc64/dl-procinfo.c: Moved to> (fe0b1e854ad32a69b260)' Signed-off-by: Vincent Chen --- include/math-emu/op-2.h | 97 ++ 1 files changed, 46 insertions(

[PATCH v3 3/5] nds32: support denormalized result through FP emulator

. Performance loss due to extra FPU exception 2. Need another scheme to control real underflow trap A new parameter, UDF_trap, which is belong to FPU context is used to control underflow trap. User can configure this feature via CONFIG_SUPPORT_DENORMAL_ARITHMETIC Signed-off-by: Vincent Chen

[PATCH v3 2/5] nds32: Support FP emulation

required to meet the requirement. Signed-off-by: Vincent Chen Signed-off-by: Nickhu --- arch/nds32/Makefile |1 + arch/nds32/include/asm/fpu.h|1 + arch/nds32/include/asm/fpuemu.h | 32 +++ arch/nds32/include/asm/nds32_fpu_inst.h | 109

[PATCH v3 0/5] nds32 FPU port

() - Store FPU context when kernel suspends - Modify the comments in code and patch Changes in v2: - Remove the initilzation for floating pointer register before entering to signal handler. Vincent Chen (5): nds32: nds32 FPU port nds32: Support FP emulation nds32: support denormalized

[RFC 1/2] RISC-V: An infrastructure to add vendor-specific code.

heck here only needs to ensure that the vendor can safely call self-checking mechanism. Hence, the macro CHECK_VENDOR_XEXT_ISA_COMPATIBLE which is used to check compatibility only compares the vendor's JEDEC manufacturer ID with the content of csr $mvendorid. Signed-off-b

[RFC 0/2] RISC-V: A proposal to add vendor-specific code

the first commit. I am glad to discuss any ideas, so if you have any idea, please give me some feedback. Vincent Chen (2): RISC-V: An infrastructure to add vendor-specific code. RISC-V: make dma_map_ops work without cache coherent agent arch/riscv/Kconfig | 49

[RFC 2/2] RISC-V: make dma_map_ops work without cache coherent agent

send the vendor-defined SBI call in this commit. We glad to change the implementation when determining the SBI usage for vendor. Signed-off-by: Vincent Chen --- arch/riscv/include/asm/sbi.h|1 + arch/riscv/vendor-nds/cache.c | 83 arch/riscv

Re: [PATCH v2 1/5] nds32: nds32 FPU port

On Thu, Oct 11, 2018 at 03:30:30PM +0800, Arnd Bergmann wrote: > On Thu, Oct 11, 2018 at 4:56 AM Vincent Chen wrote: > > > > This commit contains basic components for nds32 FPU support such as > > FPU exception handler and context switch for FPU register. > >

[PATCH v2 2/5] nds32: Support FP emulation

ent. Signed-off-by: Vincent Chen --- arch/nds32/Makefile |1 + arch/nds32/include/asm/fpu.h|1 + arch/nds32/include/asm/fpuemu.h | 32 +++ arch/nds32/include/asm/nds32_fpu_inst.h | 109 ++ arch/nds32/include/asm/sfp-machine.h|

[PATCH v2 4/5] math-emu/op-2.h: Use statement expressions to prevent negative constant shift

This modification is quoted from glibc 'commit < sysdeps/unix/sysv/linux/sparc/sparc64/dl-procinfo.c: Moved to> (fe0b1e854ad32a69b260)' Signed-off-by: Vincent Chen --- include/math-emu/op-2.h | 97 ++ 1 files changed, 46 insertions(

[PATCH v2 5/5] math-emu/soft-fp.h: (_FP_ROUND_ZERO) cast 0 to void to fix warning

#x27; Signed-off-by: Vincent Chen --- include/math-emu/soft-fp.h |2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/include/math-emu/soft-fp.h b/include/math-emu/soft-fp.h index 3f284bc..5650c16 100644 --- a/include/math-emu/soft-fp.h +++ b/include/math-emu/soft-f

[PATCH v2 3/5] nds32: support denormalized result through FP emulator

. Need another scheme to control real underflow trap A new parameter, UDF_trap, which is belong to FPU context is used to control underflow trap. User can though CONFIG_SUPPORT_DENORMAL_ARITHMETIC to configure this feature. Signed-off-by: Vincent Chen --- arch/nds32/Kconfig.cpu

[PATCH v2 0/5] nds32 FPU port

-date to pass the check by current compiler. The needed modification for soft-fp is included in this patchset Changes in v2: - Remove the initilzation for floating pointer register before entering to signal handler. Vincent Chen (5): nds32: nds32 FPU port nds32: Support FP emulation nds32

[PATCH v2 1/5] nds32: nds32 FPU port

This commit contains basic components for nds32 FPU support such as FPU exception handler and context switch for FPU register. Signed-off-by: Vincent Chen --- arch/nds32/Kconfig |1 + arch/nds32/Kconfig.cpu | 22 +++ arch/nds32/Makefile

[PATCH 3/5] nds32: support denormalized result through FP emulator

2. Need another scheme to control real underflow trap A new parameter, UDF_trap, which is belong to FPU context is used to control underflow trap. User can though CONFIG_SUPPORT_DENORMAL_ARITHMETIC to configure this feature. Signed-off-by: Vincent Chen Signed-off-by: Nickhu

[PATCH 2/5] nds32: Support FP emulation

the requirement. Signed-off-by: Vincent Chen --- arch/nds32/Makefile |1 + arch/nds32/include/asm/fpu.h|1 + arch/nds32/include/asm/fpuemu.h | 32 +++ arch/nds32/include/asm/nds32_fpu_inst.h | 109 ++ arch/nds32/include/asm/sfp-machine.h|

[PATCH 1/5] nds32: nds32 FPU port

This commit contains basic components for nds32 FPU support such as FPU exception handler and context switch for FPU register. Signed-off-by: Vincent Chen --- arch/nds32/Kconfig |1 + arch/nds32/Kconfig.cpu | 22 +++ arch/nds32/Makefile

[PATCH 0/5] nds32 FPU port

-date to pass the check by current compiler. The needed modification for soft-fp is included in this patchset Vincent Chen (5): nds32: nds32 FPU port nds32: Support FP emulation nds32: support denormalized result through FP emulator math-emu/op-2.h: Use statement expressions to prevent

[PATCH 4/5] math-emu/op-2.h: Use statement expressions to prevent negative constant shift

This modification is quoted from glibc 'commit (fe0b1e854ad32a69b260)' Signed-off-by: Vincent Chen --- include/math-emu/op-2.h | 97 ++ 1 files changed, 46 insertions(+), 51 deletions(-) diff --git a/include/math-emu/op-2.h b/include/m

[PATCH 5/5] math-emu/soft-fp.h: (_FP_ROUND_ZERO) cast 0 to void to fix warning

#x27; Signed-off-by: Vincent Chen --- include/math-emu/soft-fp.h |2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/include/math-emu/soft-fp.h b/include/math-emu/soft-fp.h index 3f284bc..5650c16 100644 --- a/include/math-emu/soft-fp.h +++ b/include/math-emu/soft-f

[PATCH 2/2] math-emu/soft-fp.h: (_FP_ROUND_ZERO) cast 0 to void to fix warning

bc 'commit (8ed1e7d5894000c155acbd06f)' Signed-off-by: Vincent Chen --- include/math-emu/soft-fp.h |2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/include/math-emu/soft-fp.h b/include/math-emu/soft-fp.h index 3f284bc..5650c16 100644 --- a/include/math-emu/soft-fp.h +++ b/i

[PATCH 1/2] math-emu/op-2.h: Use statement expressions to prevent negative constant shift

This modification references the content of glibc 'commit < sysdeps/unix/sysv/linux/sparc/sparc64/dl-procinfo.c: Moved to> (fe0b1e854ad32a69b260)' Signed-off-by: Vincent Chen --- include/math-emu/op-2.h | 97 ++ 1 files changed, 46 i

Re: nds32 build failures

On Fri, May 11, 2018 at 01:17:05PM +0800, Kito Cheng wrote: > Hi Arnd: > > I am GCC guy from Andes, we've missed the release schedule for GCC 8, > we didn't upstream the Linux support on time. > > Our plan is put our GCC 8 on github and continue commit rest patches > to upstream. > And we'll put

[PATCH 2/3] nds32: Flush the cache of the page at vmaddr instead of kaddr in flush_anon_page

According to Documentation/cachetlb.txt, the cache of the page at vmaddr shall be flushed in flush_anon_page instead of the cache of the page at page_address(page). Signed-off-by: Vincent Chen --- arch/nds32/mm/cacheflush.c |9 +++-- 1 files changed, 7 insertions(+), 2 deletions

[PATCH 1/3] nds32: Correct flush_dcache_page function

same page color as page_address(page) needs to execute data write-back in flush_dcache_page function. Signed-off-by: Vincent Chen --- arch/nds32/mm/cacheflush.c | 21 - 1 files changed, 12 insertions(+), 9 deletions(-) diff --git a/arch/nds32/mm/cacheflush.c b/arch

[PATCH 3/3] nds32: Disable local irq before calling cpu_dcache_wb_page in copy_user_highpage

In order to ensure that all data in source page has been written back to memory before copy_page, the local irq shall be disabled before calling cpu_dcache_wb_page(). In addition, removing unneeded page invalidation for 'to' page. Signed-off-by: Vincent Chen --- arch/nds32/mm/ca

[PATCH 0/3]nds32: Correct the cache operation for catch aliasing case

. Removing unneeded cache invalidation in copy_user_highpage function. Vincent Chen (3): nds32: Correct flush_dcache_page function nds32: Flush the cache of the page at vmaddr instead of kaddr in flush_anon_page nds32: Disable local irq before calling cpu_dcache_wb_page in

Re: [PATCH] signal/nds32: More information in do_revinsn

2018-04-26 0:13 GMT+08:00 Eric W. Biederman : > > While reviewing f6ed1ecad56f ("signal/nds32: Use force_sig(SIGILL) in > do_revisn") > Vincent Chen asked if it was possible to provide more information in > do_revinsn > with force_sig_fault. > > That seems reas

Re: [REVIEW][PATCH 04/17] signal/nds32: Use force_sig in unhandled_interruption and unhandled_exceptions

cess to read any of the siginfo fields. So simplfy things and > just use force_sig instead of force_sig_info. > > Fixes: 2923f5ea7738 ("nds32: Exception handling") > Cc: Vincent Chen > Cc: Greentime Hu > Cc: Arnd Bergmann > Signed-off-by: "Eric W. Bie

Re: [REVIEW][PATCH 05/17] signal/nds32: Use force_sig(SIGILL) in do_revisn

force_sig(SIG_ILL, current)" instead. > > Fixes: 2923f5ea7738 ("nds32: Exception handling") > Cc: Vincent Chen > Cc: Greentime Hu > Cc: Arnd Bergmann > Signed-off-by: "Eric W. Biederman" > --- > arch/nds32/kernel/traps.c | 5 + > 1 file chang

Re: [REVIEW][PATCH 09/22] signal/nds32: Use force_sig_fault where appropriate

o > is called, which makes the calling function clearer. > > Cc: Greentime Hu > Cc: Vincent Chen > Signed-off-by: "Eric W. Biederman" > --- > arch/nds32/kernel/traps.c | 20 > arch/nds32/mm/fault.c | 19 +-- > 2 files ch

Re: [PATCH v6 19/36] nds32: VDSO support

t;> counter). >> >> Signed-off-by: Vincent Chen >> Signed-off-by: Greentime Hu > > Acked-by: Arnd Bergmann Dear Arnd Bergmann: We find a small bug here which make LTP 20170929 clock_getres01 fail. The bug is in __vdso_clock_getres() function. When argument res is NU

Re: [PATCH v6 20/36] nds32: Signal handling support

ll recover it. We verify all modifications by LTP 2017 related cases and glibc 2.26 testsuite. We plan to add it in the next version patch and hope you can give us some comments as before. Thanks Vincent 2018-01-24 19:13 GMT+08:00 Arnd Bergmann : > On Wed, Jan 24, 2018 at 1:56 AM, Vincent C

Re: [PATCH v6 07/36] nds32: Exception handling

2018-01-24 19:10 GMT+08:00 Arnd Bergmann : > On Wed, Jan 24, 2018 at 12:09 PM, Arnd Bergmann wrote: >> On Wed, Jan 24, 2018 at 11:53 AM, Vincent Chen wrote: >>> 2018-01-18 18:14 GMT+08:00 Arnd Bergmann : > >> Ok. I still wonder about the kernel part of this though: is

Re: [PATCH v6 07/36] nds32: Exception handling

2018-01-18 18:14 GMT+08:00 Arnd Bergmann : > On Mon, Jan 15, 2018 at 6:53 AM, Greentime Hu wrote: >> From: Greentime Hu >> >> This patch includes the exception/interrupt entries, pt_reg structure and >> related accessors. >> >> Signed-off-by: Vince

Re: [PATCH v6 20/36] nds32: Signal handling support

2018-01-18 18:30 GMT+08:00 Arnd Bergmann : > On Mon, Jan 15, 2018 at 6:53 AM, Greentime Hu wrote: >> From: Greentime Hu >> >> This patch adds support for signal handling. >> >> Signed-off-by: Vincent Chen >> Signed-off-by: Greentime Hu > > I n

Re: [PATCH v6 22/36] nds32: Debugging support

2018-01-18 18:37 GMT+08:00 Arnd Bergmann : > On Mon, Jan 15, 2018 at 6:53 AM, Greentime Hu wrote: >> From: Greentime Hu >> >> This patch adds ptrace support. >> >> Signed-off-by: Vincent Chen >> Signed-off-by: Greentime Hu > > I must have missed th

Re: [PATCH v6 2/3] clocksource/drivers/atcpit100: VDSO support

er by summation of __get_timerpage() and counter register offset where __get_timerpage() is used to derive the virtual address of memory-mapped clock. 2018-01-20 19:11 GMT+08:00 Vincent Chen : > 2018-01-18 19:08 GMT+08:00 Arnd Bergmann : >> On Mon, Jan 15, 2018 at 6:57 AM, Greentime Hu w

Re: [PATCH v6 2/3] clocksource/drivers/atcpit100: VDSO support

DSO needs atcpit100 offering real-time cycle count >> to derive the correct time. >> >> Signed-off-by: Vincent Chen >> Signed-off-by: Rick Chen >> Signed-off-by: Greentime Hu > > I'm a bit puzzled by this patch, can you explain how the vdso actually >

Re: [PATCH v4 16/36] nds32: System calls handling

2017-12-18 19:19 GMT+08:00 Arnd Bergmann : > On Mon, Dec 18, 2017 at 7:46 AM, Greentime Hu wrote: > > >> new file mode 100644 >> index 000..90da745 >> --- /dev/null >> +++ b/arch/nds32/include/uapi/asm/unistd.h >> @@ -0,0 +1,12 @@ >> +// SPDX-License-Identifier: GPL-2.0 >> +// Copyright (C) 20

Re: [PATCH v3 17/33] nds32: VDSO support

2017-12-08 20:14 GMT+08:00 Mark Rutland : > On Fri, Dec 08, 2017 at 07:54:42PM +0800, Greentime Hu wrote: >> 2017-12-08 18:21 GMT+08:00 Mark Rutland : >> > On Fri, Dec 08, 2017 at 05:12:00PM +0800, Greentime Hu wrote: >> >> +static int grab_timer_node_info(void) >> >> +{ >> >> + struct device_n

Re: [PATCH v2 10/35] nds32: Atomic operations

2017-11-27 21:57 GMT+08:00 Mark Rutland : > Hi, > > On Mon, Nov 27, 2017 at 08:27:57PM +0800, Greentime Hu wrote: >> +static inline void arch_spin_unlock(arch_spinlock_t * lock) >> +{ >> + asm volatile( >> + "xor$r15, $r15, $r15\n" >> + "swi$r15, [%0]\n" >> +

Re: [PATCH v2 18/35] nds32: Debugging support

2017-11-27 22:34 GMT+08:00 Arnd Bergmann : > On Mon, Nov 27, 2017 at 1:28 PM, Greentime Hu wrote: >> +struct user_pt_regs { >> + long uregs[26]; >> + long fp; >> + long gp; >> + long lp; >> + long sp; >> + long ipc; >> +#if defined(CONFIG_HWZOL) >> + long

Re: [PATCH v2 16/35] nds32: Signal handling support

2017-11-27 22:37 GMT+08:00 Arnd Bergmann : > On Mon, Nov 27, 2017 at 1:28 PM, Greentime Hu wrote: > >> +#ifndef _ASMNDS32_SIGNAL_H >> +#define _ASMNDS32_SIGNAL_H >> + >> +#define SA_RESTORER0x0400 >> + >> +#include >> +#endif > > As documented in asm-generic/signal.h, new architectures sh

Re: [PATCH v2 14/35] nds32: System calls handling

2017-11-27 22:46 GMT+08:00 Arnd Bergmann : > On Mon, Nov 27, 2017 at 1:28 PM, Greentime Hu wrote: > >> diff --git a/arch/nds32/include/asm/syscalls.h >> b/arch/nds32/include/asm/syscalls.h >> new file mode 100644 >> index 000..741ccdc >> --- /dev/null >> +++ b/arch/nds32/include/asm/syscalls.

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