litmus-rt.git/arch/um/sys-i386/shared/sysdep, branch master The LITMUS^RT kernel. um: merge arch/um/sys-{i386,x86_64}/shared 2011-11-02T13:14:50+00:00 Al Viro viro@ftp.linux.org.uk 2011-08-18T19:03:09+00:00 858ba94499b4f48e9eb0be7cf0092f1ea9460fef Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Richard Weinberger <richard@nod.at> 
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Richard Weinberger <richard@nod.at>
um: get rid of unused macros in ptrace_user.h 2011-11-02T13:14:49+00:00 Al Viro viro@ftp.linux.org.uk 2011-08-18T19:02:49+00:00 3655c4d3c4bc105a36080c665b7294f471b0a1de Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Richard Weinberger <richard@nod.at> 
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Richard Weinberger <richard@nod.at>
um: get rid of sysdep/sc.h 2011-11-02T13:14:48+00:00 Al Viro viro@ftp.linux.org.uk 2011-08-18T19:02:39+00:00 ad694df534568b6072baebdb784b63c6209fe1cc only sysdep/sigcontext.h uses it and very few definitions are actually used. The rest refers to symbols that don't even exist anymore anyway. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Richard Weinberger <richard@nod.at> 
only sysdep/sigcontext.h uses it and very few definitions are
actually used.  The rest refers to symbols that don't even
exist anymore anyway.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Richard Weinberger <richard@nod.at>
um: Get rid of UPT_SET/UPT_REG macros 2011-11-02T13:14:48+00:00 Al Viro viro@ftp.linux.org.uk 2011-08-18T19:02:29+00:00 412f90ed13c86f066a4ab14ed5bcd0793ef0355d the only users are arch getreg()/putreg() and it's easier to handle it there instead of playing with macros from hell Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Richard Weinberger <richard@nod.at> 
the only users are arch getreg()/putreg() and it's easier to handle
it there instead of playing with macros from hell

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Richard Weinberger <richard@nod.at>
um: take vm-flags.h to sys-*/asm 2011-11-02T13:14:47+00:00 Al Viro viro@ftp.linux.org.uk 2011-08-18T19:02:19+00:00 ab785c1dd4bef85f308504c83bcf47ce787e1565 Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Richard Weinberger <richard@nod.at> 
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Richard Weinberger <richard@nod.at>
um: get rid of sysdep/checksum.h 2011-11-02T13:14:47+00:00 Al Viro viro@ftp.linux.org.uk 2011-08-18T19:02:09+00:00 c16d56a37ac6889ae9b199c02e76a03ec8a8c419 Move those to sys-.../asm/checksum.h, kill include/asm/checksum.h Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Richard Weinberger <richard@nod.at> 
Move those to sys-.../asm/checksum.h, kill include/asm/checksum.h

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Richard Weinberger <richard@nod.at>
um: -include user.h for USER_OBJ, trim includes 2011-11-02T13:14:44+00:00 Al Viro viro@ftp.linux.org.uk 2011-08-18T19:01:29+00:00 078073a3d48ce7c140f1538d249da3ac545065a6 Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Richard Weinberger <richard@nod.at> 
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Richard Weinberger <richard@nod.at>
um: take user_constants.h to include/generated 2011-11-02T13:14:44+00:00 Al Viro viro@ftp.linux.org.uk 2011-08-18T19:01:19+00:00 4de1c5f65c7dd4965a2a58b93205b747d7826110 Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Richard Weinberger <richard@nod.at> 
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Richard Weinberger <richard@nod.at>
um: kill skas_ptregs.h 2011-11-02T13:14:43+00:00 Al Viro viro@ftp.linux.org.uk 2011-08-18T19:01:09+00:00 9f270de8361d9cbbfd79e874de125a02b2d73697 It's a plain include of user_constants.h and all (2) users are including user_constants.h directly prior to that. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Richard Weinberger <richard@nod.at> 
It's a plain include of user_constants.h and all (2) users are
including user_constants.h directly prior to that.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Richard Weinberger <richard@nod.at>
um: Save FPU registers between task switches 2011-09-15T01:09:37+00:00 Ingo van Lil inguin@gmx.de 2011-09-14T23:21:23+00:00 fbfe9c847edf57ac8232aeafb290f272289893a3 Some time ago Jeff prepared 42daba316557 ("uml: stop saving process FP state") for UML to stop saving the process FP state between task switches. The assumption was that since with SKAS0 every guest process runs inside a host process context the host OS will take care of keeping the proper FP state. Unfortunately this is not true for multi-threaded applications, where all guest threads share a single host process context yet all may use the FPU on their own. Although I haven't verified it I suspect things to be even worse in SKAS3 mode where all guest processes run inside a single host process. The patch reintroduces the saving and restoring of the FP context between task switches. [richard@nod.at: Ingo posted this patch in 2009, sadly it was never applied and got lost. Now in 2011 the problem was reported by Gunnar.] Signed-off-by: Ingo van Lil <inguin@gmx.de> Signed-off-by: Richard Weinberger <richard@nod.at> Reported-by: <gunnarlindroth@hotmail.com> Tested-by: <gunnarlindroth@hotmail.com> Cc: Stanislav Meduna <stano@meduna.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> 
Some time ago Jeff prepared 42daba316557 ("uml: stop saving process FP
state") for UML to stop saving the process FP state between task
switches.  The assumption was that since with SKAS0 every guest process
runs inside a host process context the host OS will take care of keeping
the proper FP state.

Unfortunately this is not true for multi-threaded applications, where
all guest threads share a single host process context yet all may use
the FPU on their own.  Although I haven't verified it I suspect things
to be even worse in SKAS3 mode where all guest processes run inside a
single host process.

The patch reintroduces the saving and restoring of the FP context
between task switches.

[richard@nod.at: Ingo posted this patch in 2009, sadly it was never applied
and got lost. Now in 2011 the problem was reported by Gunnar.]

Signed-off-by: Ingo van Lil <inguin@gmx.de>
Signed-off-by: Richard Weinberger <richard@nod.at>
Reported-by: <gunnarlindroth@hotmail.com>
Tested-by: <gunnarlindroth@hotmail.com>
Cc: Stanislav Meduna <stano@meduna.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>