This patch, by Jake Moilanen with some further hacking from me, adds a
real execute permission bit to the linux PTEs on PPC64, and connects
that into the kernel infrastructure for implementing non-executable
stacks and heaps.  This means that on any PPC64 cpu since the POWER4
(i.e. POWER4, PPC970, PPC970FX, POWER4+, POWER5) you will get a
segfault if you try to execute instructions from a region that doesn't
have PROT_EXEC permission.  The patch also marks the pages of the
linear mapping that aren't part of the kernel text as non-executable.

Andrew and Linus, could you try this on your G5s?  I have tried it
here on a Debian system and a SLES9 system and everything runs fine,
but I haven't been able to try it on YDL, FC or RHEL4.

With this patch we default to executable stack and read-implies-exec
behaviour when there is no PT_GNU_STACK program header entry, or when
there is one and it indicates the stack is executable.  For 32-bit
processes, the heap is always executable, because the PLT contains
instructions and it ends up in the bss segment.
Signed-off-by: Jake Moilanen <moilanen@austin.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Setting the block size back to the original blocksize at umount time
is unnecessary, and can cause buffer errors and infinite loops in
__getblk_slow, and possibly other problems. 

Just getting bdev_lock instead causes other issues, namely AB-BA deadlocks
with /proc/meminfo etc. Just drop it, and replace with a "sync_blockdev()"
to cause a flush (which was a side effect of changing the blocksize before).

Debugging and testing by Jeff Mahoney <jeffm@suse.com>

Thanks to Michal Zalewski for testing.

into intel.com:/data/home/aegl/BK/linux-ia64-release-2.6.12

into ppc970.osdl.org:/home/torvalds/v2.6/linux

into ppc970.osdl.org:/home/torvalds/v2.6/linux

Keyword here being 'slightly'. The code is a mess.

into ppc970.osdl.org:/home/torvalds/v2.6/linux

On 4-way SMP, about one reboot in twenty hangs while killing processes:
exit needs exclusive tasklist_lock, but something still holds read_lock.
do_signal_stop race case misses unlock, and fixing it fixes the symptom.
Signed-off-by: Hugh Dickins <hugh@veritas.com>
Acked-by: Roland McGrath <roland@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

Also a minor fixup from Adrian Bunk.
Signed-off-by: David S. Miller <davem@davemloft.net>

Signed-off-by: David S. Miller <davem@davemloft.net>

As it is ipt_REJECT doesn't work at all with IPsec.  Despite my efforts
previously in making the policy lookups work there I neglected to change
the final call to dst_output so the policy lookup is useless.

ipt_REJECT also had a number of deviations from icmp_send which seems to
be unjustified.  For examples it ignored source routing IP options.

There was a bug in icmp_send too :) It didn't set the ICMP type/code
values for the policy lookup.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

Signed-off-by: David S. Miller <davem@davemloft.net>

into sunset.davemloft.net:/home/davem/src/BK/net-2.6

Signed-off-by: David S. Miller <davem@davemloft.net>

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

TCP options are not guaranteed to be aligned at all, so we should use
get_unaligned when accessing u16- or u32-values in the TCP
options header to avoid alignment errors on some platforms. The patch
applies to vanilla 2.6.11.
Signed-off-by: Sven Henkel <shenkel@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

This patch is wrong.  This is the *one* place where we do need to
use the path MTU.  The reason is that when the packet is fragmented
we only pay for the IPsec overhead once over all and not once for
each fragment.

Please revert it for now.

The trailer_len in ip_append_data is not quite right as the trailer's
length depends on the length of the entire packet.  However, it should
be harmless since ESP knows how to extend the packet when necessary.

Cset exclude: herbert@gondor.apana.org.au|ChangeSet|20050315181807|13007

Every user region has a hole in the middle where we don't have
enough bits in pgd+pmd+pte so pgd_addr_end needs some extra math
to compute the virtual address base of the next pgd entry.

Thanks to Dave Miller for pointing me in the right direction.
Signed-off-by: Tony Luck <tony.luck@intel.com>

Reorders struct tcp_options_received to avoid padding and shrinks the
following fields to more appropriate sizes saving 8 bytes.

saw_tstamp: char -> 1 bit
tstamp_ok: char -> 1 bit
sack_ok: char -> 4 bits
wscale_ok: char -> 1 bit
snd_wscale: u8 -> 4 bits
rcv_wscale: u8 -> 4 bits
dsack: u8 -> 1 bit
Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

Converts hop_limit and mcast_hops to signed 16 bit types saving 4 bytes
on 32bit archs and another 4 bytes on 64bit archs.
Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

Reorders struct sock to avoid padding and shrinks the following
fields to more appropriate sizes saving 12 bytes and some more
on 64bit architectures.

sk_shutdown: char -> 2 bits
sk_no_checks: char -> 2 bits
sk_userlocks: char -> 4 bits
Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

tos: int -> 8bit
uc_ttl: int -> 16 bit
cmsg_flags: int -> 16 bit
hdrincl: 8bit -> 1 bit
mc_loop: 8bit -> 1 bit

Saves 12 bytes together with the reordering.  
Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

Fix prototype of __ide_mm_{in,out}{sw,sl} function prototypes
Signed-off-by: Randolph Chung <tausq@parisc-linux.org>
Signed-off-by: Matthew Wilcox <willy@parisc-linux.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Some put_user() callers mismatch the type of the object and the pointer.
Since PA-RISC is big-endian, the wrong bits were being copied to userspace.
Signed-off-by: Randolph Chung <tausq@parisc-linux.org>
Signed-off-by: Matthew Wilcox <willy@parisc-linux.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Minor line wrapping fix

From: Kyle McMartin <kyle@parisc-linux.org>
Signed-off-by: Matthew Wilcox <willy@parisc-linux.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

MUX should never have had CON_BOOT set
Signed-off-by: Matthew Wilcox <willy@parisc-linux.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

convert from pci_module_init to pci_register_driver
(from:http://kerneljanitors.org/TODO).
Signed-off-by: Christophe Lucas <c.lucas@ifrance.com>
Signed-off-by: Domen Puncer <domen@coderock.org>
Signed-off-by: Matthew Wilcox <willy@parisc-linux.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

 - Small cleanups to LED/LCD support code

From: Grant Grundler <grundler@parisc-linux.org>
 - asm/irq.h is unnecessary
Signed-off-by: Matthew Wilcox <willy@parisc-linux.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

IODC.txt and mm were removed ages ago
Signed-off-by: Matthew Wilcox <willy@parisc-linux.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>