From 0bcefe495afec2c2be1b047c174ae402595232c2 Mon Sep 17 00:00:00 2001 From: James Hogan Date: Wed, 31 May 2017 16:19:49 +0100 Subject: [PATCH] MIPS: Fix mips_atomic_set() with EVA 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 --- arch/mips/kernel/syscall.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/arch/mips/kernel/syscall.c b/arch/mips/kernel/syscall.c index 4b88ba95dfa0..720bc8ef26ba 100644 --- a/arch/mips/kernel/syscall.c +++ b/arch/mips/kernel/syscall.c @@ -28,6 +28,7 @@ #include #include +#include #include #include #include @@ -137,9 +138,11 @@ static inline int mips_atomic_set(unsigned long addr, unsigned long new) __asm__ __volatile__ ( " .set arch=r4000 \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" " .subsection 2 \n" -- 2.43.0