evie/android_kernel_oneplus_msm8998
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

MIPS: Fix mips_atomic_set() with EVA

Browse source 
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 <james.hogan@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/16151/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
James Hogan 2017-05-31 16:19:49 +01:00 • committed by Greg Kroah-Hartman
parent de34c0799d
commit 4d9f109ff9
1 changed files with 5 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

7
arch/mips/kernel/syscall.c
View file

@ -28,6 +28,7 @@
#include <linux/elf.h>
#include <asm/asm.h>
#include <asm/asm-eva.h>
#include <asm/branch.h>
#include <asm/cachectl.h>
#include <asm/cacheflush.h>
@ -138,9 +139,11 @@ static inline int mips_atomic_set(unsigned long addr, unsigned long new)
__asm__ __volatile__ (
" .set "MIPS_ISA_ARCH_LEVEL" \n"
" li %[err], 0 \n"
"1: ll %[old], (%[addr]) \n"
"1: \n"
user_ll("%[old]", "(%[addr])")
" move %[tmp], %[new] \n"
"2: sc %[tmp], (%[addr]) \n"
"2: \n"
user_sc("%[tmp]", "(%[addr])")
" beqz %[tmp], 4f \n"
"3: \n"
" .insn \n"