linux-toradex.git/arch/um, branch v2.6.25.17

uml: PATH_MAX needs limits.h

2008-08-20T18:15:42+00:00

commit b6d8adf477439e7086224bc9674c6b6638780783 upstream.

Include limits.h to get a definition of PATH_MAX.

Signed-off-by: Ingo Molnar 
Signed-off-by: Jeff Dike 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds 
Signed-off-by: Greg Kroah-Hartman

uml: Fix boot crash

2008-08-20T18:15:41+00:00

commit 7c1fed03b9fa32d4323d5caa6a9c7dcdd7eba767 upstream

My copying of linux/init.h didn't go far enough.  The definition of
__used singled out gcc minor version 3, but didn't care what the major
version was.  This broke when unit-at-a-time was added and gcc started
throwing out initcalls.

This results in an early boot crash when ptrace tries to initialize a
process with an empty, uninitialized register set.

Signed-off-by: Jeff Dike 
Signed-off-by: Linus Torvalds 
Signed-off-by: Greg Kroah-Hartman

uml: fix gcc ICEs and unresolved externs

2008-08-20T18:15:41+00:00

commit 4f81c5350b44bcc501ab6f8a089b16d064b4d2f6 upstream

There are various constraints on the use of unit-at-a-time:
 - i386 uses no-unit-at-a-time for pre-4.0 (not 4.3)
 - x86_64 uses unit-at-a-time always

Uli reported a crash on x86_64 with gcc 4.1.2 with unit-at-a-time,
resulting in commit c0a18111e571138747a98af18b3a2124df56a0d1

Ingo reported a gcc internal error with gcc 4.3 with no-unit-at-a-timem,
resulting in 22eecde2f9034764a3fd095eecfa3adfb8ec9a98

Benny Halevy is seeing extern inlines not resolved with gcc 4.3 with
no-unit-at-a-time

This patch reintroduces unit-at-a-time for gcc >= 4.0, bringing back the
possibility of Uli's crash.  If that happens, we'll debug it.

I started seeing both the internal compiler errors and unresolved
inlines on Fedora 9.  This patch fixes both problems, without so far
reintroducing the crash reported by Uli.

Signed-off-by: Jeff Dike 
Cc: Benny Halevy 
Cc: Adrian Bunk 
Cc: Ingo Molnar 
Cc: Ulrich Drepper 
Signed-off-by: Linus Torvalds 
Signed-off-by: Greg Kroah-Hartman

uml: work around broken host PTRACE_SYSEMU

2008-08-20T18:15:40+00:00

commit f1ef9167ca4494a8c6d71d0031c73e9c8841eadd upstream

Fedora broke PTRACE_SYSEMU again, and UML crashes as a result when it
doesn't need to.  This patch makes the PTRACE_SYSEMU check fail gracefully
and makes UML fall back to PTRACE_SYSCALL.

Signed-off-by: Jeff Dike 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds 
Signed-off-by: Greg Kroah-Hartman

uml: stub needs to tolerate SIGWINCH

2008-08-20T18:15:40+00:00

commit 3d5ede6f776bdb1483bcd086f79c3bf41fed3865 upstream

We lost the marking of SIGWINCH as being OK to receive during stub
execution, causing a panic should that happen.

Cc: Benedict Verheyen 
Signed-off-by: Jeff Dike 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds 
Signed-off-by: Greg Kroah-Hartman

uml: memcpy export needs to follow host declaration

2008-08-20T18:15:38+00:00

commit 8bfd04b974689f700bbd053ad6e66b0a95fb80c9 upstream

x86_64 defines either memcpy or __memcpy depending on the gcc version, and
it looks like UML needs to follow that in its exporting.

Cc: Gabriel C 
Signed-off-by: Jeff Dike 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds 
Signed-off-by: Greg Kroah-Hartman

uml: missing export of csum_partial() on uml/amd64

2008-08-20T18:15:38+00:00

commit 3e3b48e5198544dd90e27265a70c1a834139e025 upstream

Signed-off-by: Al Viro 
Cc: Jeff Dike 
Signed-off-by: Linus Torvalds 
Signed-off-by: Greg Kroah-Hartman

uml: deal with inaccessible address space start

2008-08-20T18:15:37+00:00

commit 40fb16a360d9c6459afee91dc793c1e3374feb94 upstream

This patch makes os_get_task_size locate the bottom of the address space,
as well as the top.  This is for systems which put a lower limit on mmap
addresses.  It works by manually scanning pages from zero onwards until a
valid page is found.

Because the bottom of the address space may not be zero, it's not
sufficient to assume the top of the address space is the size of the
address space.  The size is the difference between the top address and
bottom address.

[jdike@addtoit.com: changed the name to reflect that this function is
supposed to return the top of the process address space, not its size and
changed the return value to reflect that.  Also some minor formatting
changes]

Signed-off-by: Tom Spink 
Signed-off-by: Jeff Dike 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds 
Signed-off-by: Greg Kroah-Hartman

uml: deal with host time going backwards

2008-08-20T18:15:35+00:00

commit 06e1e4ffbd1932e288839b3140cda6b8141eb684 upstream

Protection against the host's time going backwards (eg, ntp activity on
the host) by keeping track of the time at the last tick and if it's
greater than the current time, keep time stopped until the host catches
up.

Cc: Nix 
Signed-off-by: Jeff Dike 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds 
Signed-off-by: Greg Kroah-Hartman

uml: missed kmalloc() in pcap_user.c

2008-08-20T18:15:35+00:00

commit 296cd66f7f6e130fe08e6880ecb13c3fc615a8db upstream

Signed-off-by: Al Viro 
Acked-by: Jeff Dike 
Signed-off-by: Linus Torvalds 
Signed-off-by: Greg Kroah-Hartman