linux-stable.git/arch/mips/kernel/syscall.c, branch v4.12.7

MIPS: Save static registers before sysmips

2017-07-27T22:10:18+00:00

commit 49955d84cd9ccdca5a16a495e448e1a06fad9e49 upstream.

The MIPS sysmips system call handler may return directly from the
MIPS_ATOMIC_SET case (mips_atomic_set()) to syscall_exit. This path
restores the static (callee saved) registers, however they won't have
been saved on entry to the system call.

Use the save_static_function() macro to create a __sys_sysmips wrapper
function which saves the static registers before calling sys_sysmips, so
that the correct static register state is restored by syscall_exit.

Fixes: f1e39a4a616c ("MIPS: Rewrite sysmips(MIPS_ATOMIC_SET, ...) in C with inline assembler")
Signed-off-by: James Hogan 
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/16149/
Signed-off-by: Ralf Baechle 
Signed-off-by: Greg Kroah-Hartman

MIPS: Fix mips_atomic_set() with EVA

2017-07-27T22:10:17+00:00

commit 4915e1b043d6286928207b1f6968197b50407294 upstream.

EVA linked loads (LLE) and conditional stores (SCE) should be used on
EVA kernels for the MIPS_ATOMIC_SET operation of the sysmips system
call, or else the atomic set will apply to the kernel view of the
virtual address space (potentially unmapped on EVA kernels) rather than
the user view (TLB mapped).

Signed-off-by: James Hogan 
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/16151/
Signed-off-by: Ralf Baechle 
Signed-off-by: Greg Kroah-Hartman

MIPS: Fix mips_atomic_set() retry condition

2017-07-27T22:10:17+00:00

commit 2ec420b26f7b6ff332393f0bb5a7d245f7ad87f0 upstream.

The inline asm retry check in the MIPS_ATOMIC_SET operation of the
sysmips system call has been backwards since commit f1e39a4a616c ("MIPS:
Rewrite sysmips(MIPS_ATOMIC_SET, ...) in C with inline assembler")
merged in v2.6.32, resulting in the non R10000_LLSC_WAR case retrying
until the operation was inatomic, before returning the new value that
was probably just written multiple times instead of the old value.

Invert the branch condition to fix that particular issue.

Fixes: f1e39a4a616c ("MIPS: Rewrite sysmips(MIPS_ATOMIC_SET, ...) in C with inline assembler")
Signed-off-by: James Hogan 
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/16148/
Signed-off-by: Ralf Baechle 
Signed-off-by: Greg Kroah-Hartman

mips: sanitize __access_ok()

2017-04-06T06:08:06+00:00

for one thing, the last argument is always __access_mask and had been such
since 2.4.0-test3pre8; for another, it can bloody well be a static inline -
-O2 or -Os, __builtin_constant_p() propagates through static inline calls.

Signed-off-by: Al Viro

sched/headers: Prepare for new header dependencies before moving code to

2017-03-02T07:42:36+00:00

We are going to split  out of , which
will have to be picked up from other headers and a couple of .c files.

Create a trivial placeholder  file that just
maps to  to make this patch obviously correct and
bisectable.

Include the new header in the files that are going to need it.

Acked-by: Linus Torvalds 
Cc: Mike Galbraith 
Cc: Peter Zijlstra 
Cc: Thomas Gleixner 
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar

MIPS: sysmips: Remove duplicated include from syscall.c

2017-02-14T09:00:27+00:00

Remove duplicated include.

Fixes: 7c0f6ba682b9 ("Replace  with  globally")
Signed-off-by: Wei Yongjun 
Cc: Ralf Baechle 
Cc: Markus Elfring 
Cc: Wei Yongjun 
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/15213/
Signed-off-by: James Hogan

MIPS: syscall: Return directly in mips_mmap()

2017-01-25T01:51:11+00:00

* Return an error code without storing it in an intermediate variable.

* Delete the local variable "result" which became unnecessary with
  this refactoring.

Signed-off-by: Markus Elfring 
Cc: Paul Gortmaker 
Cc: linux-mips@linux-mips.org
Cc: LKML 
Cc: kernel-janitors@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/15073/
Signed-off-by: Ralf Baechle

Replace with globally

2016-12-24T19:46:01+00:00

This was entirely automated, using the script by Al:

  PATT='^[[:blank:]]*#[[:blank:]]*include[[:blank:]]*'
  sed -i -e "s!$PATT!#include !" \
        $(git grep -l "$PATT"|grep -v ^include/linux/uaccess.h)

to do the replacement at the end of the merge window.

Requested-by: Al Viro 
Signed-off-by: Linus Torvalds

MIPS: kernel: syscall: Set the appropriate ISA level for MIPS R6

2015-02-17T15:37:29+00:00

MIPS R6 changed the opcodes for LL/SC instructions so we need to set
the appropriate ISA level.

Cc: Matthew Fortune 
Signed-off-by: Markos Chandras

MIPS: Apply `.insn' to fixup labels throughout

2014-11-24T06:45:36+00:00

Fix the issue with the ISA bit being lost in fixups that jump to labels
placed just before a section switch.  Such a switch leads to the ISA bit
being lost, because GAS concludes there is no code that follows and
therefore the label refers to data.  Use the `.insn' pseudo-op to
convince the tool this is not the case.

This lack of label annotation leads to microMIPS compilation errors
like:

mips-linux-gnu-ld: arch/mips/built-in.o: .fixup+0x3b8: Unsupported jump between ISA modes; consider recompiling with interlinking enabled.
mips-linux-gnu-ld: final link failed: Bad value

Signed-off-by: Maciej W. Rozycki 
Signed-off-by: Steven J. Hill 
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/8483/
Signed-off-by: Ralf Baechle