1. 12 Apr, 2004 23 commits
    • Andrew Morton's avatar
      [PATCH] ppc64: Move EPOW log buffer to BSS · ac55528c
      Andrew Morton authored
      From: Olof Johansson <olof@austin.ibm.com>
      
      RTAS on IBM pSeries runs in real mode, so all pointers being passed in to
      it need to be in low memory.  There's two places in the RAS code that
      passes in pointers to items on the stack, which might end up being above
      the limit.
      
      Below patch resolves this by creating a buffer in BSS + a lock for
      serialization.  There's no reason to worry about contention on the lock,
      since rtas_call() also serializes on a single spinlock and this is an
      infrequent code path in the first place.
      ac55528c
    • Andrew Morton's avatar
      [PATCH] ppc64: allow hugepages anywhere in low 4GB · 81c31b89
      Andrew Morton authored
      From: David Gibson <david@gibson.dropbear.id.au>
      
      On PPC64, to deal with the restrictions imposed by the PPC MMU's segment
      design, hugepages are only allowed to be mapping in two fixed address
      ranges, one 2-3G (for use by 32-bit processes) and one 1-1.5T (for use in
      64-bit processes).  This is quite limiting, particularly for 32-bit
      processes which want to use a lot of large page memory.
      
      This patch relaxes this restriction, and allows any of the low 16 segments
      (i.e.  those below 4G) to be individually switched over to allow hugepage
      mappings (provided the segment does not already have any normal page
      mappings).  The 1-1.5T fixed range for 64-bit processes remains.
      81c31b89
    • Andrew Morton's avatar
      [PATCH] PPC64: iSeries virtual ethernet driver · 29178051
      Andrew Morton authored
      From: Stephen Rothwell <sfr@canb.auug.org.au>
      
      This is the iSeries virtual ethernet driver.  David Gibson has taken you
      previous comments and hopefully sitisfied most of them.  The driver has
      also undergone some more testing which showed up some bugs which have been
      addressed.
      
      Unfortunately, Anton is about to submit some other patches of mine which
      will sightly comflict with this.  I will send a patch shortly that will
      (hopefully) fix that.
      29178051
    • Andrew Morton's avatar
      [PATCH] ppc64: export itLpNaca on iSeries · 2b62c4ac
      Andrew Morton authored
      From: Paul Mackerras <paulus@samba.org>
      
      This patch from Julie DeWandel exports the symbol itLpNaca on iSeries
      machines, for the use of the viodasd driver.
      2b62c4ac
    • Andrew Morton's avatar
      [PATCH] disable VT on iSeries by default · db9626cd
      Andrew Morton authored
      From: Paul Mackerras <paulus@samba.org>
      
      This patch from Julie DeWandel makes CONFIG_VT default to N on iSeries
      machines which are using the iSeries virtual console driver viocons.c.  The
      VT console and the viocons code can't coexist because they use the same tty
      numbers, that is, viocons supplies /dev/tty1.  Without this patch the user
      has to figure out somehow that s/he has to turn on CONFIG_EMBEDDED in order
      to be able to turn off CONFIG_VT, which is really very non-obvious.
      db9626cd
    • Andrew Morton's avatar
      [PATCH] ppc64: Fix G5 build with DART (iommu) support · 8ff9c6ef
      Andrew Morton authored
      From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
      
      A recent patch that cleaned up some absolute/virt translation macros forgot
      one occurence, thus breaking g5 build with iommu support.
      8ff9c6ef
    • Andrew Morton's avatar
      [PATCH] ppc64: fix failure return codes from {pci,vio}_alloc_consistent() · 728be84f
      Andrew Morton authored
      From: Olof Johansson <olof@austin.ibm.com>
      
      A bug snuck in during the rewrite of ppc64 IOMMU code.  When a
      {pci,vio}_alloc_consistent() call fails, DMA_ERROR_CODE is returned instead
      of NULL.
      728be84f
    • Andrew Morton's avatar
      [PATCH] ppc64: hugepage bugfix · d0ebc08f
      Andrew Morton authored
      From: David Gibson <david@gibson.dropbear.id.au>
      
      Found this again while looking at hugepage extensions.  Haven't actually had
      it bite yet - the race is small and the other bug will never be triggered in
      32-bit processes, and the function is rarely called on 64-bit processes.
      
      This patch fixes two bugs in the (same part of the) PPC64 hugepage code.
      First the method we were using to free stale PTE pages was not safe with some
      recent changes (race condition).  BenH has fixed this to work in the new way.
       Second, we were not checking for a valid PGD entry before dereferencing the
      PMD page when scanning for stale PTE page pointers.
      d0ebc08f
    • Andrew Morton's avatar
      [PATCH] ppc64: Fix bug in hugepage support · b4e0dd09
      Andrew Morton authored
      From: David Gibson <david@gibson.dropbear.id.au>
      
      The PPC64 version of is_aligned_hugepage_range() is buggy.  It is supposed to
      test not only that the given range is hugepage aligned, but that it lies
      within the address space allowed for hugepages.  We were checking only that
      the given range intersected the hugepage range, not that it lay entirely
      within it.  This patch fixes the problem and changes the name of some macros
      to make it less likely to make that misunderstanding again.
      b4e0dd09
    • Andrew Morton's avatar
      [PATCH] ppc64: si_addr fix · 5c57dda8
      Andrew Morton authored
      From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
      
      This patch fixes si_addr on some segfaults in 64 bits mode, it used to be
      bogus (address not passed to do_page_fault by the asm code after a failure
      to set an SLB entry).
      5c57dda8
    • Andrew Morton's avatar
      [PATCH] ppc32: Fix thinko in the altivec exception code · dbf5a5af
      Andrew Morton authored
      From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
      
      Without this patch, executing an altivec instruction on an altivec capable
      CPU with a kernel that do not have CONFIG_ALTIVEC set would result in a
      kernel crash.
      
      (Fix forward ported from 2.4 by John Whitney
      <jwhitney-linuxppc@sands-edge.com>)
      dbf5a5af
    • Andrew Morton's avatar
      [PATCH] get_wchan() sparc64 fix · 906648b4
      Andrew Morton authored
      From: William Lee Irwin III <wli@holomorphy.com>
      
      Now the scheduler text is in its own ELF section this branch is asking for
      an illegal displacement.
      906648b4
    • Andrew Morton's avatar
      [PATCH] Fix get_wchan() FIXME wrt. order of functions · b283f09c
      Andrew Morton authored
      From: William Lee Irwin III <wli@holomorphy.com>
      
      This addresses the issue with get_wchan() that the various functions acting
      as scheduling-related primitives are not, in fact, contiguous in the text
      segment.  It creates an ELF section for scheduling primitives to be placed
      in, and places currently-detected (i.e.  skipped during stack decoding)
      scheduling primitives and others like io_schedule() and down(), which are
      currently missed by get_wchan() code, into this section also.
      
      The net effects are more reliability of get_wchan()'s results and the new
      ability, made use of by this code, to arbitrarily place scheduling
      primitives in the source code without disturbing get_wchan()'s accuracy.
      
      Suggestions by Arnd Bergmann and Matthew Wilcox regarding reducing the
      invasiveness of the patch were incorporated during prior rounds of review. 
      I've at least tried to sweep all arches in this patch.
      b283f09c
    • Andrew Morton's avatar
      [PATCH] i4l: kernelcapi receive workqueue and locking rework · ee28db84
      Andrew Morton authored
      From: Armin Schindler <armin@melware.de>
      
      With this patch the ISDN kernel CAPI code uses a per application workqueue
      with proper locking to prevent message re-ordering due to the fact a
      workqueue may run on another CPU at the same time.  Also some locks for
      internal data is added.
      
      Removed global recv_queue work, use per application workqueue.  Added
      proper locking mechanisms for application, controller and application
      workqueue function.  Increased max.  number of possible applications and
      controllers.
      ee28db84
    • Andrew Morton's avatar
      [PATCH] Fix VT open/close race · efffe9c8
      Andrew Morton authored
      The race is that con_close() can sleep, and drops the BKL while
      tty->count==1.  But another thread can come into init_dev() and will take a
      new ref against the tty and start using it.
      
      But con_close() doesn't notice that new ref and proceeds to null out
      tty->driver_data while someone else is using the resurrected tty.
      
      So the patch serialises con_close() against init_dev() with tty_sem.
      
      
      Here's a test app which reproduced the oops instantly on 2-way.  It realy
      needs to be run against all tty-capable devices.
      
      /*
       * Run this against a tty which nobody currently has open, such as /dev/tty9
       */
      
      #include <stdio.h>
      #include <stdlib.h>
      #include <unistd.h>
      #include <fcntl.h>
      #include <sys/ioctl.h>
      #include <linux/kd.h>
      
      void doit(char *filename)
      {
      	int fd,x;
      
      	fd = open(filename, O_RDWR);
      	if (fd < 0) {
      		perror("open");
      		exit(1);
      	}
      	ioctl(fd, KDKBDREP, &x);
      	close(fd);
      }
      
      main(int argc, char *argv[])
      {
      	char *filename = argv[1];
      
      	for ( ; ; )
      		doit(filename);
      }
      efffe9c8
    • Andrew Morton's avatar
      [PATCH] remove down_tty_sem() · ef00e355
      Andrew Morton authored
      Remove the down_tty_sem() and up_tty_sem() and replace them with open-coded
      up() and down().  This is an equivalent transformation.
      
      I assume these functions were created to open the possibility of per-tty
      semaphores at some time in the future.  But the code which is protected by
      this lock deals with two tty's at the same time, and the next patch will need
      to release the lock after the tty has been destroyed.
      ef00e355
    • Andrew Morton's avatar
      [PATCH] con_open() speedup/cleanup · c0719c5a
      Andrew Morton authored
      con_open() is called on every open of the tty, even if the tty is already all
      set up.  We only need to do that initialisation if the tty is being set up
      for the very first time (tty->count == 1).
      
      So do that: check for tty_count == 1 inside console_sem() and if so, bypass
      all the unnecessary initialisation.
      
      
      
      Note that this patch reintroduces the con_close()-vs-init_dev() race+oops. 
      This is because that oops is accidentally prevented because when it happens,
      con_open() reinstalls tty->driver_data even when tty->count > 1.
      
      But that's bogus, and when the race happens we end up running
      vcs_make_devfs() and vcs_remove_devfs() against the same console at the same
      time, producing indeterminate results.
      
      So the race needs to be fixed again, for real.
      c0719c5a
    • Andrew Morton's avatar
      [PATCH] vt.c cleanup · 49b8290a
      Andrew Morton authored
      - Remove unneeded casts of a void *
      
      - whitespace consistency.
      49b8290a
    • Andrew Morton's avatar
      [PATCH] generalise system_running · 0eb217f9
      Andrew Morton authored
      From: Olof Johansson <olof@austin.ibm.com>
      
      It's currently a boolean, but that means that system_running goes to zero
      again when shutting down.  So we then use code (in the page allocator) which
      is only designed to be used during bootup - it is marked __init.
      
      So we need to be able to distinguish early boot state from late shutdown
      state.  Rename system_running to system_state and give it the three
      appropriate states.
      0eb217f9
    • Andrew Morton's avatar
      [PATCH] feed devfs through Lindent · 243c64b2
      Andrew Morton authored
      Nobody seems to have any outstanding work against devfs, so...
      243c64b2
    • Andrew Morton's avatar
      [PATCH] Fix URLs in Kconfig files · 77b92f5b
      Andrew Morton authored
      From: Rusty Russell <rusty@rustcorp.com.au>
      
      From: "Petri T. Koistinen" <petri.koistinen@iki.fi>
      
      1) Various URLs in the Kconfig files are out of date: update them.
      
      2) URLs should be of form <http://url-goes-here>.
      
      3) References to files in the source should be of form
         <file:path-from-top>
      
      4) Email addresses should be of form <foo@bar.com>
      77b92f5b
    • Andrew Morton's avatar
      [PATCH] x86-64 update · 3dccf5d0
      Andrew Morton authored
      From: Andi Kleen <ak@muc.de>
      
      Current x86-64 patchkit for 2.6.5.
      
      - Add drivers/firmware/Kconfig
      
      - Clarify description of CONFIG_IOMMU_DEBUG
      
      - Use correct gcc option to optimize for Intel CPUs
      
      - Add EDD support (Matt Domsch)
      
      - Add workaround for broken IOMMU on VIA hardware.  Uses swiotlb there now.
      
      - Handle more than 8 local APICs (Suresh B Siddha) 
      
      - Delete obsolete mtrr Makefile
      
      - Add x86_cache_alignment and set it up properly for P4 (128 bytes instead
        of 64bytes).  Also report in /proc/cpuinfo
      
      - Minor cleanup in in_gate_area
      
      - Make asm-generic/dma-mapping.h compile with !CONFIG_PCI Just stub out all
        functions in this case.  This is mainly to work around sysfs.
      
      - More !CONFIG_PCI compile fixes
      
      - Make u64 sector_t unconditional
      3dccf5d0
    • Ivan Kokshaysky's avatar
      [PATCH] Fix unaligned stxncpy again · b5c7a2dd
      Ivan Kokshaysky authored
      Herbert Xu noted:
        "The current stxncpy on alpha is still broken when it comes to single
         word, unaligned, src misalignment > dest misalignment copies.
      
         I've attached a program which demonstrates this problem."
      
      Ugh, indeed. It fails when there is a zero byte before the data.
      Thanks.
      
      Here is the fix for this (both regular and ev6 version).
      b5c7a2dd
  2. 03 Apr, 2004 9 commits
  3. 02 Apr, 2004 8 commits