diff options
| author | Srinivasarao P <spathi@codeaurora.org> | 2018-10-15 14:35:13 +0530 |
|---|---|---|
| committer | Srinivasarao P <spathi@codeaurora.org> | 2018-10-15 14:35:31 +0530 |
| commit | 02d722f11f25bf90751ea82888850501cc255629 (patch) | |
| tree | 3fd8c2ffc1418d82cfe8f0dcd0a21aafbe3ff512 /arch/arc/kernel/process.c | |
| parent | f25fed271059c7a4afe6db46f085e80e2c4db073 (diff) | |
| parent | 8e7f196597f3f917aa4825b296bdc3082f669f8d (diff) | |
Merge android-4.4.161 (8e7f196) into msm-4.4
* refs/heads/tmp-8e7f196
Linux 4.4.161
ebtables: arpreply: Add the standard target sanity check
ath10k: fix scan crash due to incorrect length calculation
tcp: add tcp_ooo_try_coalesce() helper
tcp: call tcp_drop() from tcp_data_queue_ofo()
tcp: free batches of packets in tcp_prune_ofo_queue()
tcp: fix a stale ooo_last_skb after a replace
tcp: use an RB tree for ooo receive queue
tcp: increment sk_drops for dropped rx packets
ubifs: Check for name being NULL while mounting
ucma: fix a use-after-free in ucma_resolve_ip()
ARC: clone syscall to setp r25 as thread pointer
powerpc/fadump: Return error when fadump registration fails
ath10k: fix use-after-free in ath10k_wmi_cmd_send_nowait
cgroup: Fix deadlock in cpu hotplug path
ext4: always verify the magic number in xattr blocks
of: unittest: Disable interrupt node tests for old world MAC systems
USB: serial: simple: add Motorola Tetra MTP6550 id
xhci: Add missing CAS workaround for Intel Sunrise Point xHCI
dm cache: fix resize crash if user doesn't reload cache table
PM / core: Clear the direct_complete flag on errors
mac80211: fix setting IEEE80211_KEY_FLAG_RX_MGMT for AP mode keys
PCI: Reprogram bridge prefetch registers on resume
x86/vdso: Fix vDSO syscall fallback asm constraint regression
x86/vdso: Fix asm constraints on vDSO syscall fallbacks
fbdev/omapfb: fix omapfb_memory_read infoleak
mm/vmstat.c: skip NR_TLB_REMOTE_FLUSH* properly
Change-Id: If31f9e57679a3b1deb1049c86aeaead5ccbd64a6
Signed-off-by: Srinivasarao P <spathi@codeaurora.org>
Diffstat (limited to 'arch/arc/kernel/process.c')
| -rw-r--r-- | arch/arc/kernel/process.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/arch/arc/kernel/process.c b/arch/arc/kernel/process.c index b5db9e7fd649..79109de38ea4 100644 --- a/arch/arc/kernel/process.c +++ b/arch/arc/kernel/process.c @@ -153,6 +153,26 @@ int copy_thread(unsigned long clone_flags, task_thread_info(current)->thr_ptr; } + + /* + * setup usermode thread pointer #1: + * when child is picked by scheduler, __switch_to() uses @c_callee to + * populate usermode callee regs: this works (despite being in a kernel + * function) since special return path for child @ret_from_fork() + * ensures those regs are not clobbered all the way to RTIE to usermode + */ + c_callee->r25 = task_thread_info(p)->thr_ptr; + +#ifdef CONFIG_ARC_CURR_IN_REG + /* + * setup usermode thread pointer #2: + * however for this special use of r25 in kernel, __switch_to() sets + * r25 for kernel needs and only in the final return path is usermode + * r25 setup, from pt_regs->user_r25. So set that up as well + */ + c_regs->user_r25 = c_callee->r25; +#endif + return 0; } |