Re: [PATCH v2 2/6] powerpc/pkeys: Save the pkey registers before fork
flat view
From: Michael Ellerman <mpe@ellerman.id.au>
Date: 2018-06-19 12:39:57
Ram Pai [off-list ref] writes:
When a thread forks the contents of AMR, IAMR, UAMOR registers in the newly forked thread are not inherited. Save the registers before forking, for content of those registers to be automatically copied into the new thread. CC: Michael Ellerman <mpe@ellerman.id.au> CC: Florian Weimer <redacted> CC: Andy Lutomirski <luto@kernel.org> CC: Thiago Jung Bauermann <redacted> Signed-off-by: Ram Pai <redacted>
Again this is an ABI change but we'll call it a bug fix I guess.
I'll add:
Fixes: cf43d3b26452 ("powerpc: Enable pkey subsystem")
Cc: stable@vger.kernel.org # v4.16+
cheers
quoted hunk ↗ jump to hunk
diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c index 9ef4aea..991d097 100644 --- a/arch/powerpc/kernel/process.c +++ b/arch/powerpc/kernel/process.c@@ -583,6 +583,7 @@ static void save_all(struct task_struct *tsk) __giveup_spe(tsk); msr_check_and_clear(msr_all_available); + thread_pkey_regs_save(&tsk->thread); } void flush_all_to_thread(struct task_struct *tsk)-- 1.7.1