Re: [PATCH 16/20] ARC: entry: Add more common chores to EXCEPTION_PROLOGUE
Hi Vineet, > Subject: [PATCH 16/20] ARC: entry: Add more common chores to > EXCEPTION_PROLOGUE > > THe high level structure of most ARC exception handlers is > 1. save regfile with EXCEPTION_PROLOGUE > 2. setup r0: EFA (not part of pt_regs) > 3. setup r1: pointer to pt_regs (SP) > 4. drop down to pure kernel mode (from exception) > 5. call the Linux "C" handler > > Remove the boiler plate code by moving #2, #3, #4 into #1. > > The exceptions to most exceptions are syscall Trap and Machine check > which don't do some of above for various reasons, so call a newly > introduced variant EXCEPTION_PROLOGUE_KEEP_AE (same as original > EXCEPTION_PROLOGUE) I'm observing the ARC700 (nSIM) system freeze after this patch. ... f000.serial: ttyS0 at MMIO 0xf000 (irq = 24, base_baud = 3125000) is a 16550A printk: console [ttyS0] enabled printk: console [ttyS0] enabled printk: bootconsole [uart8250] disabled printk: bootconsole [uart8250] disabled NET: Registered PF_PACKET protocol family NET: Registered PF_KEY protocol family clk: Disabling unused clocks Freeing unused kernel image (initmem) memory: 2856K This architecture does not have kernel memory protection. Run /init as init process > @@ -128,11 +123,6 @@ ENTRY(EV_PrivilegeV) > > EXCEPTION_PROLOGUE > > - lr r0, [efa] > - mov r1, sp > - > - FAKE_RET_FROM_EXCPN > - > bl do_privilege_fault > b ret_from_exception The same update is also required for the call_do_page_fault wrapper for ARcompact. Regards, Pavel ___ linux-snps-arc mailing list linux-snps-arc@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-snps-arc
Re: [PATCH] treewide: drop CONFIG_EMBEDDED
Hi Jesse, I replied to your comment a few days ago, but for some reason your email to me contains: Reply-To: 20230816055010.31534-1-rdun...@infradead.org so it wasn't sent directly to you. My former reply is below. On 8/16/23 20:15, Randy Dunlap wrote: > Hi Jesse, > > On 8/16/23 15:45, Jesse Taube wrote: >> Hi, Randy >> >>> diff -- a/init/Kconfig b/init/Kconfig >>> --- a/init/Kconfig >>> +++ b/init/Kconfig >>> @@ -1790,14 +1790,6 @@ config DEBUG_RSEQ >>> >>> If unsure, say N. >>> >>> -config EMBEDDED >>> - bool "Embedded system" >>> - select EXPERT >>> - help >>> - This option should be enabled if compiling the kernel for >>> - an embedded system so certain expert options are available >>> - for configuration. >> >> Wouldn't removing this break many out of tree configs? > > I'm not familiar with out-of-tree configs. > Do you have some examples of some that use CONFIG_EMBEDDED? > (not distros) > >> Should there be a warning here to update change it instead of removal? > > kconfig doesn't have a warning mechanism AFAIK. > Do you have an idea of how this would work? > > We could make a smaller change to init/Kconfig, like so: > > config EMBEDDED > - bool "Embedded system" > + bool "Embedded system (DEPRECATED)" > select EXPERT > help > - This option should be enabled if compiling the kernel for > - an embedded system so certain expert options are available > - for configuration. > + This option is being removed after Linux 6.6. > + Use EXPERT instead of EMBEDDED. > > but there is no way to produce a warning message. I.e., even with this > change, the message will probably be overlooked. > > --- > ~Randy -- ~Randy ___ linux-snps-arc mailing list linux-snps-arc@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-snps-arc
Re: [PATCH] treewide: drop CONFIG_EMBEDDED
On Fri, Aug 18, 2023 at 7:44 PM Randy Dunlap wrote: > > Hi Jesse, > > I replied to your comment a few days ago, but for some reason > your email to me contains: > Reply-To: 20230816055010.31534-1-rdun...@infradead.org > so it wasn't sent directly to you. Sorry about that I messed up the email headers... > > My former reply is below. > > On 8/16/23 20:15, Randy Dunlap wrote: > > Hi Jesse, > > > > On 8/16/23 15:45, Jesse Taube wrote: > >> Hi, Randy > >> > >>> diff -- a/init/Kconfig b/init/Kconfig > >>> --- a/init/Kconfig > >>> +++ b/init/Kconfig > >>> @@ -1790,14 +1790,6 @@ config DEBUG_RSEQ > >>> > >>> If unsure, say N. > >>> > >>> -config EMBEDDED > >>> -bool "Embedded system" > >>> -select EXPERT > >>> -help > >>> - This option should be enabled if compiling the kernel for > >>> - an embedded system so certain expert options are available > >>> - for configuration. > >> > >> Wouldn't removing this break many out of tree configs? > > > > I'm not familiar with out-of-tree configs. > > Do you have some examples of some that use CONFIG_EMBEDDED? > > (not distros) Buildroot has a few. It won't immediately break Buildroot and Yocto as they have a set version, but it could be confusing for anyone updating the kernel. > > > >> Should there be a warning here to update change it instead of removal? > > > > kconfig doesn't have a warning mechanism AFAIK. > > Do you have an idea of how this would work? No, unfortunately. As you said without a warning it would be overlooked so a change would not be necessary. A possible solution is to check in a header file with: #ifdef CONFIG_EMBEDDED #warning "CONFIG_EMBEDDED has changed to CONFIG_EXPERT" #endif Does anyone else have an opinion on this? Since kconfig doesn't have a warning mechanism the patch seems fine as is. Thanks, Jesse Taube > > > > We could make a smaller change to init/Kconfig, like so: > > > > config EMBEDDED > > - bool "Embedded system" > > + bool "Embedded system (DEPRECATED)" > > select EXPERT > > help > > - This option should be enabled if compiling the kernel for > > - an embedded system so certain expert options are available > > - for configuration. > > + This option is being removed after Linux 6.6. > > + Use EXPERT instead of EMBEDDED. > > > > but there is no way to produce a warning message. I.e., even with this > > change, the message will probably be overlooked. > > > > --- > > ~Randy > > -- > ~Randy ___ linux-snps-arc mailing list linux-snps-arc@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-snps-arc
