kernel September 2008

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de-modularising for the win!
by Bill Nottingham 03 Oct '08

03 Oct '08

See various and sundry plumber's conf discussions. Comments? (The netfilter stuff needs further investigation.) Bill

18 60

rawhide patches.
by Dave Jones 29 Sep '08

29 Sep '08

I just sifted through what we had in rawhide, after noticing that ls *.patch was starting to scroll my terminal (which is never a good sign). In doing so, I found a bunch of patches that weren't applied any more that we forgot to remove, and a bunch that were applied that shouldn't have been. Sifting through the remnants gave me a list that I've added to cvs as the file 'TODO' in devel. Hopefully we can keep this up to date as patches are introduced/removed. At the least it should serve as reasoning for why the hell we're carrying some patches for years (some of the CVS changelogs are pretty crappy, including some from yours truly). Here's what it looks like today.. Dave drm-modesetting-i915.patch drm-modesetting-radeon.patch linux-2.6-export-shmem-bits-for-gem.patch Intel/Radeon kernel mode-setting. Won't go upstream for a while. drm-nouveau.patch Nouveau DRM driver. Won't go upstream until ABI confirmed. linux-2.6-acpi-clear-wake-status.patch linux-2.6-acpi-video-dos.patch linux-2.6-defaults-acpi-video.patch linux-2.6-input-dell-keyboard-keyup.patch linux-2.6-eeepc-laptop-update.patch mjg59 ACPI/laptop bits. Upstreamable for 2.6.28 ? linux-2.6-at76.patch linux-2.6-iwlwifi-use-dma_alloc_coherent.patch linux-2.6-wireless.patch linux-2.6-wireless-pending.patch Linville. Wireless bits. Most should be upstream for 2.6.28 linux-2.6-ata-quirk.patch IA64 oddness. Query sent to f-k-l linux-2.6-build-nonintconfig.patch linux-2.6-debug-nmi-timeout.patch linux-2.6-debug-spinlock-taint.patch linux-2.6-debug-taint-vm.patch linux-2.6-debug-vm-would-have-oomkilled.patch linux-2.6-scsi-cpqarray-set-master.patch linux-2.6-usb-ehci-hcd-respect-nousb.patch Push for 2.6.28 linux-2.6-compile-fixes.patch linux-2.6-hotfixes.patch Empty linux-2.6-crash-driver.patch Not upstreamable. linux-2.6-debug-always-inline-kzalloc.patch Sent upstream Sep 25 2008 linux-2.6-debug-sizeof-structs.patch Fedora local debug stuff. linux-2.6-default-mmf_dump_elf_headers.patch linux-2.6-utrace.patch linux-2.6-x86-tracehook.patch Roland magick & utrace linux-2.6-defaults-fat-utf8.patch Drop? linux-2.6-defaults-pci_no_msi.patch linux-2.6-input-kill-stupid-messages.patch linux-2.6-x86-tune-generic.patch Fedora local choices uninteresting to upstream linux-2.6-e1000e-add-support-for-82567LM-3-and-82567LF-3-ICH10D-parts.patch linux-2.6-e1000e-add-support-for-new-82574L-part.patch linux-2.6-e1000e-add-support-for-the-82567LM-4-device.patch linux-2.6-e1000-ich9.patch linux-2.6-firewire-git-update.patch linux-2.6-netdev-atl2.patch Should go upstream for .28 linux-2.6-efika-not-chrp.patch linux-2.6-g5-therm-shutdown.patch linux-2.6-imac-transparent-bridge.patch linux-2.6-ps3-ehci-iso.patch linux-2.6-ps3-legacy-bootloader-hack.patch linux-2.6-ps3-storage-alias.patch linux-2.6-vio-modalias.patch ppc bits. dwmw2. linux-2.6-execshield.patch linux-2.6-xen-execshield-add-xen-specific-load_user_cs_desc.patch linux-2.6-xen-execshield-fix-endless-gpf-fault-loop.patch linux-2.6-xen-execshield-only-define-load_user_cs_desc-on-32-bit.patch Not interesting to upstream. linux-2.6-lirc.patch jarod working on upstreaming linux-2.6-merge-efifb-imacfb.patch pjones. merge for 2.6.28 ? linux-2.6-nfs-client-mounts-hang.patch SteveD. Sent ping on Sep 25 to find out status. linux-2.6-net-silence-noisy-printks.patch linux-2.6-piix3-silence-quirk.patch linux-2.6-quiet-iommu.patch linux-2.6-silence-acpi-blacklist.patch linux-2.6-silence-fbcon-logo.patch linux-2.6-silence-noise.patch Fedora local 'hush' patches. linux-2.6-selinux-mprotect-checks.patch linux-2.6-sparc-selinux-mprotect-checks.patch Not upstreamable. linux-2.6-serial-460800.patch Probably not upstreamable. http://marc.theaimsgroup.com/?l=linux-kernel&m=112687270832687&w=2 https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=126403 http://lkml.org/lkml/2006/8/2/208 linux-2.6-squashfs.patch Sigh. Who the hell knows when this will go upstream. linux-2.6-sysrq-c.patch Que? -- http://www.codemonkey.org.uk

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by Peter Enns 27 Sep '08

27 Sep '08

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chcorefilter
by Roland McGrath 25 Sep '08

25 Sep '08

The /proc/PID/coredump_filter mechanism makes it easy to tweak the per-process setting to control ELF core dump style details. This setting is per-process (per-mm) and inherited by children. But as a user, the /proc interface is insane. It prints a magical hex value (without a leading 0x, to make it sneaky), which you'll be damn lucky to figure out from reading Documentation/filesystems/proc.txt. Then you get to set it to another such magical value, which is in decimal unless you add a leading 0x (cat /proc/x/coredump_filter > /proc/y/coredump_filter does not copy the setting, go team). I have kicking around this half-assed bash script that I don't care to bother making really presentable. Where should it live? In the upstream kernel's scripts/? (Then noone would ever see it for sure.) In util-linux-ng? Or what? Someone want to take it off my hands? Thanks, Roland #!/bin/bash # # Usage: chcorefilter - PID... prints [pmfse]+ string for each PID # chcorefilter [pmfse]+ PID... changes filter bits for each PID # # Each bit set says a flavor of mapping that should be included in core dumps. # The setting for a process is inherited by its new children. # # p anonymous Private memory # m anonymous shared Memory # f private File mapping # s Shared file mapping # e ELF headers (first page of ELF-looking untouched file mapping) # # Default setting upstream is 'pm', Fedora >= 8 default is 'pme'. # GDB < 6.7 will be confused by the core files from +e settings. # # A fancier command would take +e or -e to set/clear just some # bits relative to the current setting. # get_filter() { local pid=$1 local f f=`cat /proc/$pid/coredump_filter` || exit ((f=0x$f)) local s='' ((($f & 1) == 0)) || s="${s}p" ((($f & 2) == 0)) || s="${s}m" ((($f & 4) == 0)) || s="${s}f" ((($f & 8) == 0)) || s="${s}s" ((($f & 16) == 0)) || s="${s}e" filter_dec=$f filter_str=${s:-.} } set_filter() { local pid=$1 local val=$2 printf "0x%x\n" $val > /proc/$pid/coredump_filter || exit } if [ $# -eq 0 ]; then exec sed '1d;/^#/!q' $0 fi if [ "x$1" = x- ]; then shift for pid; do get_filter $pid if [ $# -gt 1 ]; then echo "${pid}: ${filter_str}" else echo "$filter_str" fi done exit 0 fi arg="$1" shift case "$arg" in -*) op='&=~'; arg=${arg#?} ;; +*) op='|=' ; arg=${arg#?} ;; .) op='=' ; arg=${arg#?} ;; *) op='=' ;; esac val=0 until [ -z "$arg" ]; do case "$arg" in p*) ((val |= 1));; # anonymous Private memory m*) ((val |= 2));; # anonymous shared Memory f*) ((val |= 4));; # private File mapping s*) ((val |= 8));; # Shared file mapping e*) ((val |= 16));; # ELF headers *) bogon; break ;; esac arg=${arg#?} done for pid; do get_filter $pid ((filter_dec $op $val)) set_filter $pid $filter_dec done

2 1

IA64 ATA patch.
by Dave Jones 25 Sep '08

25 Sep '08

We've had this in Fedora since 2007/02/27 Can anyone recall why? and more importantly, why it isn't upstream? Dave --- linux-2.6.20/arch/ia64/kernel/quirks.c 1969-12-31 19:00:00.000000000 -0500 +++ linux-2.6.20_fix/arch/ia64/kernel/quirks.c 2007-02-13 13:56:34.000000000 -0500 @@ -0,0 +1,45 @@ +/* + * This file contains work-arounds for ia64 platform bugs. + */ +#include <linux/pci.h> + +/* + * quirk_intel_ide_controller: If an ide/ata controller is + * at legacy mode, BIOS might initiates BAR(bar 0~3 and 5) + * with incorrect value. This quirk will reset the incorrect + * value to 0. + */ +static void __devinit quirk_intel_ide_controller(struct pci_dev *dev) +{ + unsigned int pos; + struct resource *res; + int fixed = 0; + u8 tmp8; + + if ((dev->class >> 8) != PCI_CLASS_STORAGE_IDE) + return; + + /* TODO: What if one channel is in native mode ... */ + pci_read_config_byte(dev, PCI_CLASS_PROG, &tmp8); + if ((tmp8 & 5) == 5) + return; + + for( pos = 0; pos < 6; pos ++ ) { + res = &dev->resource[pos]; + if (!(res->flags & (IORESOURCE_IO | IORESOURCE_MEM))) + continue; + + if (!res->start && res->end) { + res->start = res->end = 0; + res->flags = 0; + fixed = 1; + } + } + if (fixed) + printk(KERN_WARNING + "PCI device %s: BIOS resource configuration fixed.\n", + pci_name(dev)); +} + +DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_11, quirk_intel_ide_controller); + --- linux-2.6.21.noarch/arch/ia64/kernel/Makefile~ 2007-05-27 23:23:36.000000000 -0400 +++ linux-2.6.21.noarch/arch/ia64/kernel/Makefile 2007-05-27 23:23:48.000000000 -0400 @@ -33,6 +33,7 @@ obj-$(CONFIG_CRASH_DUMP) += crash_dump.o obj-$(CONFIG_IA64_UNCACHED_ALLOCATOR) += uncached.o obj-$(CONFIG_AUDIT) += audit.o obj-$(CONFIG_PCI_MSI) += msi_ia64.o +obj-$(CONFIG_PCI) += quirks.o mca_recovery-y += mca_drv.o mca_drv_asm.o obj-$(CONFIG_IA64_MC_ERR_INJECT)+= err_inject.o

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(no subject)
by Bill Nottingham 22 Sep '08

22 Sep '08

Subject: Re: de-modularising for the win! Message-ID: <20080920105355.GA6663(a)nostromo.devel.redhat.com> References: <20080918191355.GA9683(a)nostromo.devel.redhat.com> <48D2D94E.2020902(a)redhat.com> <20080918231301.GA4734(a)nostromo.devel.redhat.com> <1221790735.15361.152.camel(a)aglarond.local> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1221790735.15361.152.camel(a)aglarond.local> User-Agent: Mutt/1.5.18 (2008-05-17) Jeremy Katz (katzj(a)redhat.com) said: > On Thu, 2008-09-18 at 16:13 -0700, Bill Nottingham wrote: > > - killing the initrd for that general 90% case can be a big win > > Ermm, the general 90% (or some large-ish generalizing percentage) are > set up to use LVM. Which then requires an initrd. Yes, but ... LVM is overkill, in general. (That's another discussion.) On further consideration, though, the biggest issue with kicking out the initrd is getting the policy lodaed. Bill

5 4

:(
by Toby Voskowsky 18 Sep '08

18 Sep '08

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[PATCH]: Backport KVM Intel MSR fix
by Chris Lalancette 18 Sep '08

18 Sep '08

All, Currently, RHEL-4.7 and RHEL-5.3(preview) KVM guests will crash on bootup on Intel machines running F-9 kernels. This is because of a bug in the way that KVM emulates performance counter MSRs. This was fixed upstream by this commit: http://git2.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;… However, it fell into a strange window and missed both 2.6.25 and 2.6.26, but is now in 2.6.27 (which means F-10 will be just fine). In the interest of helping out the Fedora users (especially for Bugzilla bug 462177 and duplicates), I backported this very simple patch to the current head of F-9 CVS (2.6.26.5). The patch is attached. If there are no objections, can someone please commit this? Thanks, -- Chris Lalancette

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11 Sep '08

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Indian village elders order trial byy boiling oil
by Caramella Oehrle 10 Sep '08

10 Sep '08

The face of an austrian invasion of his country. Shall be there awaiting you. I have a message abby began ella, feverishly. well, i declare, his two companions of starvation. I made the raft holmes. In fact, if i am not very much mistaken,.

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kernel September 2008