TODO

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= PA-RISC Linux TODO (actually this is Helge's TODO list) =
 
= PA-RISC Linux TODO (actually this is Helge's TODO list) =
  
== Status & TODO 2020-08-05 ==
+
== Status & TODO 2020-12-08 ==
 +
* Fix PGD_ORDER and pgd_spinlock() as suggested by Matthew Wilcox, see: https://lore.kernel.org/linux-parisc/20201204124402.GN11935@casper.infradead.org/
 +
* parisc timers: convert to generic clockevent (Arnd Bergmann) - https://patchwork.kernel.org/project/linux-parisc/patch/20201008154651.1901126-14-arnd@arndb.de/
 +
* qemu: Check "HPPA support for IGNITE-UX install discs" for HP Logic Analyzer 16700A (Mail from Keith Monahan <keith@techtravels.org> Sept 2020)
 +
** ncr53c710 driver from amiga: https://github.com/tonioni/WinUAE/blob/master/qemuvga/lsi53c710.cpp
 +
* Check Sven's HPMC patch, against https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b845f66f78bf42a4ce98e5cfe0e94fab41dd0742
 +
* Check if https://lkml.org/lkml/2020/7/23/1246 was added to avoid TLB stalls (commits https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c6fe44d96fc1536af5b11cd859686453d1b7bfd1 and https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=2a9127fcf2296674d58024f83981f40b128fffea) - kernel v5.9 seems good.
 +
* STARTED by Sven: Fix kexec on PA8800/PA8900 CPUs: how to restart the CPUs on these systems?
 
* Add TOC handler - CC_MC_OS_TOC_MISSING on c8000 (Sven)
 
* Add TOC handler - CC_MC_OS_TOC_MISSING on c8000 (Sven)
 +
** Enable TOC button on c8000, sending TOC via IPMI interface "toc s",
 
* upgrade libgcc via:
 
* upgrade libgcc via:
 
** apt install -f -o Dpkg::Options::="--force-overwrite"
 
** apt install -f -o Dpkg::Options::="--force-overwrite"
 
** see: https://raphaelhertzog.com/2011/08/01/understanding-dpkgs-file-overwrite-error/
 
** see: https://raphaelhertzog.com/2011/08/01/understanding-dpkgs-file-overwrite-error/
 
* qemu
 
* qemu
** Add pvpanic kernel support?
+
** Check "IGNITE-UX install discs" from Keith Monahan (09/20)
** Add kernel fw_cfg support (drivers/firmware/qemu_fw_cfg.c) ?
+
** Add pvpanic kernel support? - maybe?
 
** STARTED: Finish LASI and 82596 NIC for QEMU -> https://github.com/hdeller/qemu-hppa/commits/lasi
 
** STARTED: Finish LASI and 82596 NIC for QEMU -> https://github.com/hdeller/qemu-hppa/commits/lasi
* Analyze futex hang situation with test-lock testcase in the libprelude debian package
+
* DONE: autofs/automounter is broken, patch sent to list, https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=892953
* Fix kexec on PA8800/PA8900 CPUs: how to restart the CPUs on these systems?
+
* automounter/autofs is broken, most likely compiler problem: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=892953
+
 
* Fix stifb kernel hangs with latest kernels (4.9ff)
 
* Fix stifb kernel hangs with latest kernels (4.9ff)
 
* Add BPF assember implementation
 
* Add BPF assember implementation
Line 18: Line 24:
 
* ONGOING: Enable UBSAN and fix fallouts
 
* ONGOING: Enable UBSAN and fix fallouts
 
* STARTED: implement CONFIG_VMAP_STACK "virtually mapped stacks and thread_info cleanup" -> https://lwn.net/Articles/693026/
 
* STARTED: implement CONFIG_VMAP_STACK "virtually mapped stacks and thread_info cleanup" -> https://lwn.net/Articles/693026/
* Enable TOC button on c8000, sending TOC via IPMI interface "toc s",
 
 
* PALO - add regular rewind & load to avoid tftp boot timing issues. See mail from Frank Schreiner "PALO issues" (Dec 2018).
 
* PALO - add regular rewind & load to avoid tftp boot timing issues. See mail from Frank Schreiner "PALO issues" (Dec 2018).
** Modify palo to be able to load lifimage file
 
 
* STARTED: Implement kernel VDSO support - https://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux.git/log/?h=vdso
 
* STARTED: Implement kernel VDSO support - https://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux.git/log/?h=vdso
** Get rid of executable stack, maybe use gateway page instead for signal returns?
 
 
** [https://lore.kernel.org/linux-parisc/4544A34A.6080700@tausq.org/ Randolphs patch]
 
** [https://lore.kernel.org/linux-parisc/4544A34A.6080700@tausq.org/ Randolphs patch]
 
** [[Vdso]]
 
** [[Vdso]]
** Review gettimeofday and clock_gettime() implementation, possibly use a light-weight-syscall and rely on cr16 and cpu speed for more accurate timing? similiar to commit http://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/?id=18ad51dd342a7eb09dbcd059d0b451b616d4dafc  
+
*** Get rid of executable stack, maybe use gateway page instead for signal returns?
 +
*** Review gettimeofday and clock_gettime() implementation, possibly use a light-weight-syscall and rely on cr16 and cpu speed for more accurate timing? similiar to commit http://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/?id=18ad51dd342a7eb09dbcd059d0b451b616d4dafc  
 
* STARTED: convert old-style rtc driver drivers/input/misc/hp_sdc_rtc.c to new RTC model, remove the procfs and miscdevice interfaces first and replace the ioctl with a struct rtc_class_ops. Arnd Bergmann can review those patches, but Alexandre and Alessandro are the ones who would merge them once the driver is moved to drivers/rtc. (Mail from Arnd Bergmann, 28.04.2016) - see https://patchwork.kernel.org/patch/10701397/
 
* STARTED: convert old-style rtc driver drivers/input/misc/hp_sdc_rtc.c to new RTC model, remove the procfs and miscdevice interfaces first and replace the ioctl with a struct rtc_class_ops. Arnd Bergmann can review those patches, but Alexandre and Alessandro are the ones who would merge them once the driver is moved to drivers/rtc. (Mail from Arnd Bergmann, 28.04.2016) - see https://patchwork.kernel.org/patch/10701397/
 
* check usage of CONFIG_MLONGCALLS, only 14MB/s with debian kernel and dd if=/dev/zero of=here bs=1k count=100000  ?
 
* check usage of CONFIG_MLONGCALLS, only 14MB/s with debian kernel and dd if=/dev/zero of=here bs=1k count=100000  ?
Line 37: Line 41:
 
* Enable BlockTLB on PA1.x for STI framebuffer (see block tlb info in sti.pdf documentation) and ftp://parisc.parisc-linux.org/docs/pdc32.pdf
 
* Enable BlockTLB on PA1.x for STI framebuffer (see block tlb info in sti.pdf documentation) and ftp://parisc.parisc-linux.org/docs/pdc32.pdf
 
* convert unaligned handler to use get_user/put_user inline asm
 
* convert unaligned handler to use get_user/put_user inline asm
* Fix shutdown: I had issued a "shutdown -r".  As noted above, a panic occurred during the reboot (all CPUs were up). After this, stall messages were output to console after the bios version was printed.  So yes, maybe CPUs should be "stopped" before a panic reboot? (by Dave, mail from 2017-03-31)
 
 
* Fix boot crash from Al Viro with sti gfx card (24.03.17)
 
* Fix boot crash from Al Viro with sti gfx card (24.03.17)
 
* debian parisc perl bug (http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=721537) shows that mmap on parisc linux is horribly inefficient.  We allocate huge maps for small files. This should be improved. Mailthread: " parisc mmap: private file maps" ,http://www.spinics.net/lists/linux-parisc/msg05083.html  or  https://rt.perl.org/Public/Bug/Display.html?id=119567  https://rt.perl.org/Public/Bug/Display.html?id=119567  
 
* debian parisc perl bug (http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=721537) shows that mmap on parisc linux is horribly inefficient.  We allocate huge maps for small files. This should be improved. Mailthread: " parisc mmap: private file maps" ,http://www.spinics.net/lists/linux-parisc/msg05083.html  or  https://rt.perl.org/Public/Bug/Display.html?id=119567  https://rt.perl.org/Public/Bug/Display.html?id=119567  
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** Revert "parisc: Use ldcw instruction for SMP spinlock release barrier"
 
** Revert "parisc: Use ldcw instruction for SMP spinlock release barrier"
 
** Revert "parisc: Revert "Release spinlocks using ordered store""
 
** Revert "parisc: Revert "Release spinlocks using ordered store""
** parisc: Do not use an ordered store in pa_tlb_lock()
+
** [http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e72b23dec1da5e62a0090c5da1d926778284e230 '''parisc: Do not use an ordered store in pa_tlb_lock()'''] (backported to 5.0+)
 
** parisc: elf.h: delete a duplicated word
 
** parisc: elf.h: delete a duplicated word
 
** parisc: make the log level string for register dumps const
 
** parisc: make the log level string for register dumps const
 +
** sections.h: dereference_function_descriptor() returns void pointer
 +
** parisc: Whitespace cleanups in atomic.h
 +
** [http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e96ebd589debd9a6a793608c4ec7019c38785dea '''parisc: Implement __smp_store_release and __smp_load_acquire barriers'''] (backported to 4.14+)
 +
** parisc/kernel/ftrace: Remove function callback casts
 +
** [http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5b24993c21cbf2de11aff077a48c5cb0505a0450 '''parisc: mask out enable and reserved bits from sba imask'''] (backported to all)
 +
** [http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=6f6aea7e966cda5a817d091e938c2d9b52209893 '''parisc: fix PMD pages allocation by restoring pmd_alloc_one()''']
 +
* Kernel 5.10
 +
** parisc: disable CONFIG_IDE in defconfigs
 +
** fw_cfg: Add support for parisc architecture
 +
** [http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=024f5b597564acced9e69305f7a9ef1202186a61 '''parisc: Add qemu fw_cfg interface''']
 +
** parisc: Avoid external interrupts when IPI finishes
 +
** [http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=41f5a81c07cd410917c9ae3c165b9b761d48ba75 parisc: Drop HP-UX specific fcntl and signal flags]
 +
** [http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=75ae04206a4d0e4f541c1d692b7febd1c0fdb814 '''parisc: Define O_NONBLOCK to become 000200000''']
 +
** parisc: Drop useless comments in uapi/asm/signal.h
 +
** parisc: Add ioread64_hi_lo() and iowrite64_hi_lo()
 +
** parisc: Install vmlinuz instead of zImage file
 +
** parisc: Add MAP_UNINITIALIZED define
 +
** parisc/sticon: Always register sticon console driver
 +
** [http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7ff3f14ddc355bfbc94c766f43b90606b1f79e83 '''parisc/sticon: Add user font support''']
 +
** parisc: Add alternative patching to synchronize_caches define
 +
** parisc: Fix comments and enable interrupts later
 +
** parisc: Mark pointers volatile in __xchg8(), __xchg32() and __xchg64()
 +
** [http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=53a42b6324b8ddce1e9d2f34da2ca68ef21c2084 '''parisc: Switch to more fine grained lws locks''']
 +
** parisc: Rewrite tlb flush threshold calculation
 +
** parisc: Improve spinlock handling
 +
** parisc: Improve error return codes when setting rtc time
 +
** [http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=879bc2d27904354b98ca295b6168718e045c4aa2 '''hil/parisc: Disable HIL driver when it gets stuck''']
 +
** [http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=44a4c9e443674e6cd3368d3e642dfe9c429d5525 '''parisc: Add wrapper syscalls to fix O_NONBLOCK flag usage''']
 +
** ata: pata_ns87415.c: Document support on parisc with superio chip
 +
* Kernel 5.11
 +
** parisc: pci-dma: fix warning unused-function
 +
** parisc/uapi: Use Kbuild logic to provide <asm/types.h>
 +
** parisc: Drop loops_per_jiffy from per_cpu struct
 +
** parisc: Use _TIF_USER_WORK_MASK in entry.S
 +
** [http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=22ee3ea588dfc84ccb8cea5ea37051dfed91b9b9 parisc: Make user stack size configurable]
 +
  
 
== Debian kernel and userspace programs ==
 
== Debian kernel and userspace programs ==
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** DONE: Fix fallouts from strace: http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b7dc5a071ddf69c0350396b203cba32fe5bab510,  
 
** DONE: Fix fallouts from strace: http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b7dc5a071ddf69c0350396b203cba32fe5bab510,  
 
** DONE: implement kexec syscall
 
** DONE: implement kexec syscall
 +
** DONE: Analyze futex hang (CPU soft lockup) situation with test-lock testcase in the libprelude debian package - fixed by [http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=be6577af0cef934ccb036445314072e8cb9217b9 '''parisc: Add atomic64_set_release() define to avoid CPU soft lockups''']
  
 
* Debian installer:
 
* Debian installer:
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** DONE: Fix sbuild not returning used disc size: /usr/share/perl5/Sbuild/Build.pm line 2786, see https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=923484
 
** DONE: Fix sbuild not returning used disc size: /usr/share/perl5/Sbuild/Build.pm line 2786, see https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=923484
  
== ABI breakages (HP-UX support) ==
+
QEMU:
 +
* DONE: Add kernel fw_cfg support (drivers/firmware/qemu_fw_cfg.c)
 +
 
 +
== ABI breakages (e.g. dropped HP-UX support) ==
 
* [http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=f5a408d53edef3af07ac7697b8bc54a755628450 We dropped HP-UX support in kernel 3.14 by changing EWOULDBLOCK==EAGAIN.] HP-UX could be run in a VM instead or since machines are relatively cheap now, if someone needs hpux, they can buy a machine for it.  
 
* [http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=f5a408d53edef3af07ac7697b8bc54a755628450 We dropped HP-UX support in kernel 3.14 by changing EWOULDBLOCK==EAGAIN.] HP-UX could be run in a VM instead or since machines are relatively cheap now, if someone needs hpux, they can buy a machine for it.  
* [http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=1f25df2eff5b25f52c139d3ff31bc883eee9a0ab Changed RTSIGMIN to 32 (from 37)]
+
* [http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=1f25df2eff5b25f52c139d3ff31bc883eee9a0ab Changed SIGRTMIN to 32 (from 37)]
 
** [http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=766605 debian glibc report]  and  [http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=766635 debian kernel bug report]
 
** [http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=766605 debian glibc report]  and  [http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=766635 debian kernel bug report]
 
** September 7th 2014: First delivery with vmlinux-3.16.0-4 (aka linux-image-3.16.0-4-parisc64-smp_3.16.7-1_hppa.deb)
 
** September 7th 2014: First delivery with vmlinux-3.16.0-4 (aka linux-image-3.16.0-4-parisc64-smp_3.16.7-1_hppa.deb)
 +
** How to install:
 +
*** Install the new glibc debian package, then install systemd, then install the new kernel package (this will create a new initrd), reboot
 
** rebuild of following packages needed:
 
** rebuild of following packages needed:
 
*** unxz-utils: rebuild unxz to fix usage of SIGXFSZ
 
*** unxz-utils: rebuild unxz to fix usage of SIGXFSZ
Line 822: Line 867:
 
*** dietlibc (patch sent upstream) - https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=769105  TODO: make patch for dietlibc to use LONG_LONG_PAIR for ftruncate64() and then rebuild util-vserver package
 
*** dietlibc (patch sent upstream) - https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=769105  TODO: make patch for dietlibc to use LONG_LONG_PAIR for ftruncate64() and then rebuild util-vserver package
 
* [http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=93cb8e20d56be40c541475f77b5f565fbb385a4b Dropped ENOTSUP (252) constant from kernel with v4.19]. Gave problems and parisc is only platform which defined it because of HP-UX, see libuv bug: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=900237. Nevertheless rebuild of libattr, libseliux and fakeroot necessary.
 
* [http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=93cb8e20d56be40c541475f77b5f565fbb385a4b Dropped ENOTSUP (252) constant from kernel with v4.19]. Gave problems and parisc is only platform which defined it because of HP-UX, see libuv bug: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=900237. Nevertheless rebuild of libattr, libseliux and fakeroot necessary.
 +
* '''Kernel 5.10: Define O_NONBLOCK to become 000200000 (instead of 000200004):'''
 +
** [http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=75ae04206a4d0e4f541c1d692b7febd1c0fdb814 '''parisc: Define O_NONBLOCK to become 000200000''']
 +
** [http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=44a4c9e443674e6cd3368d3e642dfe9c429d5525 '''parisc: Add wrapper syscalls to fix O_NONBLOCK flag usage''']
 +
** [https://sourceware.org/git?p=glibc.git;a=commit;h=a24f414ba11a7acdf3c5ccec3fb327fc72166556 '''GLIBC PATCH: Remove obsolete defines for HPUX support from fcntl.h and update O_NONBLOCK.''']
 +
** [https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=974690 ''dietlibc Debian bug report'']
  
 
== Considerations between Debian unstable and Debian Jessie release ==
 
== Considerations between Debian unstable and Debian Jessie release ==

Latest revision as of 20:29, 16 December 2020

Contents

[edit] PA-RISC Linux TODO (actually this is Helge's TODO list)

[edit] Status & TODO 2020-12-08

  • Kernel: still missing Linux kernel development (no patches available yet):
    • maybe implement transparent huge pages (due to cache coherency technically only possible on PA8500-PA8700 CPUs, not possible on PA8800-PA8900 CPUs)
    • optimize flush_dcache_page() implementation like sparc. See Documentation/cachetlb.txt, e.g. used in aio subsystem
    • NO_IRQ -> should be converted to (0) instead of (-1) -> Helge (check assembly, check in drivers/parisc/*)
    • check assembly in drivers/parisc/*
    • use pdc_add_valid() in kern_addr_valid(), protect against crashable acesses (like for superio-pc-drivers-detection in lp), add pdc_add_valid() to create a probe_kernel_read() implementation.
    • arch/parisc/kernel/sys_parisc.c -> use SYSCALL_ALIAS() -> maybe
  • Kernel: Low priority patches needs further work
    • disable FP-register save/restore at kernel entry? - https://patchwork.kernel.org/patch/3975291/
    • enable 16k/64k kernel page sizes (still cacheflushing-issues with SCSI driver, additional work in glibc needed to deal with >4k page size, e.g. ld-loader alignments of data/code segments)
    • Superdome support - can someone test? Should work better now with latest kernels (maybe ask Dennis Clarke <dclarke@blastwave.org>, Jan 2019).
    • Visualize FX support (will probably never happen!)
    • implement BUG() and WARN() with inline assembly so that interrupt happens in delay branch of "or,<> %r0,cond,%r0". Probably not possible, because gcc will report "control reaches end of non-void function" warnings/errors.
  • 64-bit userspace support (from Dave Anglin, Nick Hudson):
    • 64-bit userspace, Binutils 64-bit binutils needs to be fixed to get multiple stub section support.
    • glibc port (hppa64 can use the generic thread code)
    • 64-bit support in gcc is probably pretty good as 64-bit HP-UX works fine.
    • gdb could be a problem due to a lack of a maintainer.
  • Debian packages / Userspace work
    • IMPORTANT: fix OpenJDK - fixes required in zeroport (stack grows up!).
    • gcc -> join 32- and 64bit compiler, make "-m64" work, get rid of hppa64-linux-gnu-gcc
  • userspace
  • palo (PA-RISC Boot Loader):
    • Fix palo deb package to build iplboot natively (https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=851792)
    • Palo needs better user interaction instead of "0", "1".... Howtos.
    • Modify (if possible), that palo can read (sequential) tftpbootable-vmlinuxes as well as the current boot-vmlinux images (simplifies build/handling)

[edit] Upstream PA-RISC-related kernel patch history


[edit] Debian kernel and userspace programs

Debian kernel / Generic Kernel bugs fixed

    • DONE: Fixed 64bit SMP kernel & sticon on machines with more than 4GB RAM (Kernel 3.12)
    • DONE: Lots of syscall fixes regarding compat kernel
    • DONE: send patches to remove UP from debian kernels, use sil680 instead of siimage, see http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=721191 -> fixed in 3.12 / 3.13
    • DONE: Enable BMC in c8000 default kernel config - ipmi driver (CONFIG_IPMI_HANDLER=y) - http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=747482
    • DONE: remove HIL RTC from debian kernel - it creates a backtrace at boot because we have already another rtc0 active.
    • DONE: add ppdev driver, needed by CUPS, systemd reports missing module load (3.17 & 3.16 kernel)
    • DONE: Add crc-modules, event, isofs, jfs, mouse, sata, sound, squashfs, udf, uinput, scsi-common, scsi-extra, loop, serial and usb-serial debian-installer packages
    • DONE: Kernel build problem: a) disable -mfast-indirect-calls in Makefile, b) gcc compiler bug in > gcc-4.8.3-3
    • DONE: Drop HPUX-support from kernel (Kernel 4.0)
    • DONE: implemented HUGE pages
    • DONE: kernel timerfd_settime/timerfd_gettime issue, test with debian package: liblinux-fd-perl -> https://patchwork.kernel.org/patch/7951661/, backported to all kernels
    • DONE: kernel ptrace bug: http://thread.gmane.org/gmane.linux.ports.parisc/26273, possible fix: https://patchwork.kernel.org/patch/8063301/
    • DONE: Implement CONFIG_DEBUG_STACK_USAGE, in kernel 4.6
    • DONE: Use 32bit exception table entries, in kernel 4.6
    • DONE: implemented seccomp syscal, including SECCOMP_MODE_STRICT and mode 2
    • DONE: Fixed FTRACE support (http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=366dd4ea9d5f0eb78fdf4982d76506f99480ec0a)
    • DONE: Add syscall ftrace support
    • DONE: Simplify get_user()/put_user() with regard to %sr0/%sr2 usage.
    • DONE: Add tracehook support (needed for seccomp testcases, gdb, ...)
    • DONE: Added high-resolution sched_clock clocksources in 4.7, needed for debian packages: ismrmrd, haskell-http-conduit, ...
    • DONE: Detect physically broken memory via Page Deallocation Table (PDT), initial support in kernel 4.13
    • DONE: Make kernel self-decompressing (instead of palo reading gzipped kernels)
    • DONE: fix %pF and %pS usage in all kernel code
    • DONE: Enabled BMC/IPMI including Remote power on/off on C8000 and rp3410 machines (kernel 4.17 and above)
    • DONE: use CONFIG_COMPAT_BINFMT_ELF and get rid of arch/parisc/kernel/binfmt_elf32.c
    • DONE: Fix kernel writing core file, gdb reporting: BFD: Warning: /tmp/core.http.1655.ls3011.1465554447 is truncated: expected core file size >= 2187264, found: 2121728.
    • DONE: Find way to extract vmlinux out of vmlinuz (Kernel 4.19)
    • DONE: Implement alternative coding for UP & SMP, one debian kernel for UP and SMP, optimizations to avoid cache flushes on cache-less systems and other qemu-related speed-ups to avoid unnecessary syncronization (Kernel 4.20)
    • DONE: IRQ Balancing was broken, http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f73493eb4aecdd6edd8a749890e6e2dcfa0a7978
    • DONE: Added kgdb and kprobes in kernel 5.2, by Sven Schnelle
    • DONE: report on C8000 one socket with 2 cores
    • DONE: Check Kernel boot code if RAM of machine is big enough (e.g. is booting on 710 machine with 60MB possible?) - https://patchwork.kernel.org/patch/10888283/
    • DONE: convert to SPARSEMEM, instead of DISCONTIGMEM
    • DONE: (NOT POSSIBLE:) Enable huge pages on kernel text for C8000 as well - not possible, will crash due to required equivalent aliasing of caches.
    • DONE: Enable __ro_after_init
    • DONE: add dynamic ftrace support - provided by Sven in kernel 5.3
    • DONE: Fix fallouts from strace: http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b7dc5a071ddf69c0350396b203cba32fe5bab510,
    • DONE: implement kexec syscall
    • DONE: Analyze futex hang (CPU soft lockup) situation with test-lock testcase in the libprelude debian package - fixed by parisc: Add atomic64_set_release() define to avoid CPU soft lockups

QEMU:

  • DONE: Add kernel fw_cfg support (drivers/firmware/qemu_fw_cfg.c)

[edit] ABI breakages (e.g. dropped HP-UX support)

[edit] Considerations between Debian unstable and Debian Jessie release

Jessie was not stable on SMP machines, particularly those with PA8800/PA8900 processors. It's recommended to use kernel 4.4.15 or later. The current default gcc for unstable is gcc 5.4. Most hppa fixes have been back ported to 4.9 but not all. It shouldn't hurt to use binutils from unstable. Debian glibc 2.23 is best. Most old packages should still work although there maybe inequivalent aliasing issues which are relevant on PA8800. There's also a nasty issue with gmon_start being in every shared library in Jessie. This caused a few headaches and potentially breaks applications when it's removed from a library. If you stick with the glibc in Jessie, multithreaded applications may not work as well as they could, but maybe that's not important. The kernel update is the most important one. Since hppa moved to ports, there has been a huge number of bug fixes. System stability is dramatically improved and I believe more packages are available than ever before. It's better to run unstable and just be selective about running "apt-get upgrade". (by Dave Anglin)

[edit] parisc-linux.org Homepage and Debian build server infrastructure work

[edit] Linus Torvalds barking at parisc

[edit] Testsuites, kernel and userspace testing tools

[edit] TODO Drivers

  • write Lasi floppy driver
  • write Suckyio floppy driver
  • write spifi driver (rbrad)
  • modify ncr53c8xx driver for Outfield (735 & 755)
  • write GSC FDDI driver
  • write Timi ASIC (74x) support
  • EISA DMA support

[edit] Review all the todo entries below!

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