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[V2,5/5] powerpc: Preserve the SPR values across fork() syscalls

Message ID 1459814367-3057-5-git-send-email-cyrilbur@gmail.com (mailing list archive)
State Changes Requested
Headers show

Commit Message

Cyril Bur April 4, 2016, 11:59 p.m. UTC 
Currently copy_thread() doesn't flush SPRs to the parent thread struct.
Currently this only affects the TAR register as perf takes care of some of the
others and the remaining ones are all Event Based Branch (EBB) registers which
are cleared across fork().

Signed-off-by: Cyril Bur <cyrilbur@gmail.com>
---
 arch/powerpc/kernel/process.c | 2 ++
 1 file changed, 2 insertions(+)
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Patch

diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index 7625976..892c76d 100644
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -1037,6 +1037,8 @@  void flush_all_to_thread(struct task_struct *tsk)
 		BUG_ON(tsk != current);
 		save_all(tsk);
 
+		save_sprs(&tsk->thread);
+
 #ifdef CONFIG_SPE
 		if (tsk->thread.regs->msr & MSR_SPE)
 			tsk->thread.spefscr = mfspr(SPRN_SPEFSCR);