linux-toradex.git/arch/x86/math-emu, branch v4.4.142

x86/fpu/math-emu: Fix possible uninitialized variable use

2018-02-25T10:03:43+00:00

commit 75e2f0a6b16141cb347f442033ec907380d4d66e upstream.

When building the kernel with "make EXTRA_CFLAGS=...", this overrides
the "PARANOID" preprocessor macro defined in arch/x86/math-emu/Makefile,
and we run into a build warning:

  arch/x86/math-emu/reg_compare.c: In function ‘compare_i_st_st’:
  arch/x86/math-emu/reg_compare.c:254:6: error: ‘f’ may be used uninitialized in this function [-Werror=maybe-uninitialized]

This fixes the implementation to work correctly even without the PARANOID
flag, and also fixes the Makefile to not use the EXTRA_CFLAGS variable
but instead use the ccflags-y variable in the Makefile that is meant
for this purpose.

Signed-off-by: Arnd Bergmann 
Cc: Bill Metzenthen 
Cc: Linus Torvalds 
Cc: Peter Zijlstra 
Cc: Thomas Gleixner 
Link: http://lkml.kernel.org/r/20170719125310.2487451-3-arnd@arndb.de
Signed-off-by: Ingo Molnar 
Signed-off-by: Greg Kroah-Hartman

Merge branch 'x86-headers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2015-11-04T05:05:40+00:00

Pull x86 sigcontext header cleanups from Ingo Molnar:
 "This series reorganizes and cleans up various aspects of the main
  sigcontext UAPI headers, such as unifying the data structures and
  updating/adding lots of comments to explain all the ABI details and
  quirks.  The headers can now also be built in user-space standalone"

* 'x86-headers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/headers: Clean up too long lines
  x86/headers: Remove  references on the kernel side
  x86/headers: Remove direct sigcontext32.h uses
  x86/headers: Convert sigcontext_ia32 uses to sigcontext_32
  x86/headers: Unify 'struct sigcontext_ia32' and 'struct sigcontext_32'
  x86/headers: Make sigcontext pointers bit independent
  x86/headers: Move the 'struct sigcontext' definitions into the UAPI header
  x86/headers: Clean up the kernel's struct sigcontext types to be ABI-clean
  x86/headers: Convert uses of _fpstate_ia32 to _fpstate_32
  x86/headers: Unify 'struct _fpstate_ia32' and i386 struct _fpstate
  x86/headers: Unify register type definitions between 32-bit compat and i386
  x86/headers: Use ABI types consistently in sigcontext*.h
  x86/headers: Separate out legacy user-space structure definitions
  x86/headers: Clean up and better document uapi/asm/sigcontext.h
  x86/headers: Clean up uapi/asm/sigcontext32.h
  x86/headers: Fix (old) header file dependency bug in uapi/asm/sigcontext32.h

x86/fpu/math-emu: Add support for FISTTP instructions

2015-09-20T14:19:02+00:00

These FPU instructions were added in SSE3-enabled CPUs.

Run-tested by booting with "no387 nofxsr" and running test
program:

	[RUN]	Testing fisttp instructions
	[OK]	fisttp

Signed-off-by: Denys Vlasenko 
Cc: Andy Lutomirski 
Cc: Borislav Petkov 
Cc: Brian Gerst 
Cc: H. Peter Anvin 
Cc: Kees Cook 
Cc: Linus Torvalds 
Cc: Peter Zijlstra 
Cc: Shuah Khan 
Cc: Thomas Gleixner 
Cc: linux-kernel@vger.kernel.org
Link: http://lkml.kernel.org/r/1442600614-28428-1-git-send-email-dvlasenk@redhat.com
Signed-off-by: Ingo Molnar

x86/fpu/math-emu: Add support for FCMOVcc insns

2015-09-20T08:19:53+00:00

Run-tested by booting with "no387 nofxsr" and running test
program:

  [RUN]   Testing fcmovCC instructions
  [OK]    fcmovCC

Signed-off-by: Denys Vlasenko 
Cc: Andy Lutomirski 
Cc: Borislav Petkov 
Cc: Brian Gerst 
Cc: H. Peter Anvin 
Cc: Kees Cook 
Cc: Linus Torvalds 
Cc: Peter Zijlstra 
Cc: Thomas Gleixner 
Cc: linux-kernel@vger.kernel.org
Link: http://lkml.kernel.org/r/1442588010-20055-3-git-send-email-dvlasenk@redhat.com
Signed-off-by: Ingo Molnar

x86/fpu/math-emu: Add support for F[U]COMI[P] insns

2015-09-20T08:19:53+00:00

Run-tested by booting with "no387 nofxsr" and running test
program:

  [RUN]   Testing f[u]comi[p] instructions

  [OK]    f[u]comi[p]

Signed-off-by: Denys Vlasenko 
Cc: Andy Lutomirski 
Cc: Borislav Petkov 
Cc: Brian Gerst 
Cc: H. Peter Anvin 
Cc: Kees Cook 
Cc: Linus Torvalds 
Cc: Peter Zijlstra 
Cc: Thomas Gleixner 
Cc: linux-kernel@vger.kernel.org
Link: http://lkml.kernel.org/r/1442588010-20055-2-git-send-email-dvlasenk@redhat.com
Signed-off-by: Ingo Molnar

x86/fpu/math-emu: Remove define layer for undocumented opcodes

2015-09-20T08:19:52+00:00

No code changes.

Signed-off-by: Denys Vlasenko 
Cc: Andy Lutomirski 
Cc: Borislav Petkov 
Cc: Brian Gerst 
Cc: H. Peter Anvin 
Cc: Kees Cook 
Cc: Linus Torvalds 
Cc: Peter Zijlstra 
Cc: Thomas Gleixner 
Cc: linux-kernel@vger.kernel.org
Link: http://lkml.kernel.org/r/1442588010-20055-1-git-send-email-dvlasenk@redhat.com
Signed-off-by: Ingo Molnar

x86/fpu/math-emu: Remove !NO_UNDOC_CODE

2015-09-15T06:01:46+00:00

We always want to support all FPU opcodes, including
undocumented ones. That define was fully justified ~20 years ago
but not today. Let's not complicate the code with it.

Signed-off-by: Denys Vlasenko 
Cc: Andy Lutomirski 
Cc: Borislav Petkov 
Cc: H. Peter Anvin 
Cc: Kees Cook 
Cc: Linus Torvalds 
Cc: Peter Zijlstra 
Cc: Thomas Gleixner 
Link: http://lkml.kernel.org/r/1440699330-1305-1-git-send-email-dvlasenk@redhat.com
Signed-off-by: Ingo Molnar

x86/headers: Remove references on the kernel side

2015-09-08T08:06:05+00:00

Now that all type definitions are in the UAPI header, include it
directly, instead of through .

[ We still keep asm/sigcontext.h, so that uapi/asm/sigcontext32.h
  can include . ]

Acked-by: Mikko Rapeli 
Cc: Andy Lutomirski 
Cc: Borislav Petkov 
Cc: Brian Gerst 
Cc: Denys Vlasenko 
Cc: H. Peter Anvin 
Cc: Linus Torvalds 
Cc: Oleg Nesterov 
Cc: Peter Zijlstra 
Cc: Thomas Gleixner 
Cc: linux-kernel@vger.kernel.org
Link: http://lkml.kernel.org/r/1441438363-9999-16-git-send-email-mingo@kernel.org
Signed-off-by: Ingo Molnar

Merge branch 'x86/urgent' into x86/asm to fix up conflicts and to pick up fixes

2015-08-18T07:39:47+00:00

Conflicts:
	arch/x86/entry/entry_64_compat.S
	arch/x86/math-emu/get_address.c

Signed-off-by: Ingo Molnar

x86/ldt: Further fix FPU emulation

2015-08-16T22:11:05+00:00

The previous fix confused a selector with a segment prefix.  Fix it.

Compile-tested only.

Cc: stable@vger.kernel.org
Cc: Juergen Gross 
Reported-by: Linus Torvalds 
Fixes: 4809146b86c3 ("x86/ldt: Correct FPU emulation access to LDT")
Signed-off-by: Andy Lutomirski 
Signed-off-by: Linus Torvalds