diff options
| author | Nicholas Piggin <npiggin@gmail.com> | 2018-10-13 00:15:16 +1100 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2018-10-14 18:04:09 +1100 |
| commit | 4c2de74cc8696154b283f241d74ec0bb24438e22 (patch) | |
| tree | 85fe4333599db98756971f364ef4beb654abc162 /arch/powerpc/kernel/process.c | |
| parent | 3eeacd9f4ea33546f272fcf131d6a11edbe3b4a6 (diff) | |
powerpc/64: Interrupts save PPR on stack rather than thread_struct
PPR is the odd register out when it comes to interrupt handling, it is
saved in current->thread.ppr while all others are saved on the stack.
The difficulty with this is that accessing thread.ppr can cause a SLB
fault, but the SLB fault handler implementation in C change had
assumed the normal exception entry handlers would not cause an SLB
fault.
Fix this by allocating room in the interrupt stack to save PPR.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/kernel/process.c')
| -rw-r--r-- | arch/powerpc/kernel/process.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c index 0ed8d0968515..f9d1cca28cce 100644 --- a/arch/powerpc/kernel/process.c +++ b/arch/powerpc/kernel/process.c @@ -1710,7 +1710,7 @@ int copy_thread(unsigned long clone_flags, unsigned long usp, p->thread.dscr = mfspr(SPRN_DSCR); } if (cpu_has_feature(CPU_FTR_HAS_PPR)) - p->thread.ppr = INIT_PPR; + childregs->ppr = DEFAULT_PPR; p->thread.tidr = 0; #endif |