Patch "Revert: "powerpc/tm: Check for already reclaimed tasks"" has been added to the 4.4-stable tree

Patch "Revert: "powerpc/tm: Check for already reclaimed tasks"" has been added to the 4.4-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    Revert: "powerpc/tm: Check for already reclaimed tasks"

to the 4.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     revert-powerpc-tm-check-for-already-reclaimed-tasks.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Fri May  6 12:03:29 EDT 2016
Date: Fri, 06 May 2016 12:03:29 -0400
To: Greg KH <gregkh@linuxfoundation.org>
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Subject: Revert: "powerpc/tm: Check for already reclaimed tasks"

This reverts commit e924c60db1b4891e45d15a33474ac5fab62cf029 which was
commit 7f821fc9c77a9b01fe7b1d6e72717b33d8d64142 upstream.

It shouldn't have been applied as the original was already in 4.4.

Reported-by: Jiri Slaby <jslaby@suse.cz>
Cc: Michael Neuling <mikey@neuling.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/powerpc/kernel/process.c |   18 ------------------
 1 file changed, 18 deletions(-)

--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -569,24 +569,6 @@ static void tm_reclaim_thread(struct thr
 	if (!MSR_TM_SUSPENDED(mfmsr()))
 		return;
 
-	/*
-	 * Use the current MSR TM suspended bit to track if we have
-	 * checkpointed state outstanding.
-	 * On signal delivery, we'd normally reclaim the checkpointed
-	 * state to obtain stack pointer (see:get_tm_stackpointer()).
-	 * This will then directly return to userspace without going
-	 * through __switch_to(). However, if the stack frame is bad,
-	 * we need to exit this thread which calls __switch_to() which
-	 * will again attempt to reclaim the already saved tm state.
-	 * Hence we need to check that we've not already reclaimed
-	 * this state.
-	 * We do this using the current MSR, rather tracking it in
-	 * some specific thread_struct bit, as it has the additional
-	 * benifit of checking for a potential TM bad thing exception.
-	 */
-	if (!MSR_TM_SUSPENDED(mfmsr()))
-		return;
-
 	tm_reclaim(thr, thr->regs->msr, cause);
 
 	/* Having done the reclaim, we now have the checkpointed


Patches currently in stable-queue which might be from gregkh@linuxfoundation.org are

queue-4.4/rdma-iw_cxgb4-fix-bar2-virt-addr-calculation-for-t4-chips.patch
queue-4.4/revert-powerpc-tm-check-for-already-reclaimed-tasks.patch
queue-4.4/ata-ahci_xgene-dereferencing-uninitialized-pointer-in-probe.patch
queue-4.4/lpfc-fix-misleading-indentation.patch
queue-4.4/ipvs-handle-ip_vs_fill_iph_skb_off-failure.patch
queue-4.4/clk-qcom-msm8960-fix-ce3_src-register-offset.patch
queue-4.4/clk-versatile-sp810-support-reentrance.patch
queue-4.4/clk-rockchip-free-memory-in-error-cases-when-registering-clock-branches.patch
queue-4.4/ipvs-correct-initial-offset-of-call-id-header-search-in-sip-persistence-engine.patch
queue-4.4/clk-divider-make-sure-read-only-dividers-do-not-write-to-their-register.patch
queue-4.4/mfd-intel-lpss-remove-clock-tree-on-error-path.patch
queue-4.4/nbd-ratelimit-error-msgs-after-socket-close.patch
queue-4.4/mwifiex-fix-corner-case-association-failure.patch
queue-4.4/cns3xxx-fix-pci-cns3xxx_write_config.patch
queue-4.4/clk-qcom-msm8960-fix-ce3_core-clk-enable-register.patch
queue-4.4/ipvs-drop-first-packet-to-redirect-conntrack.patch
queue-4.4/soc-rockchip-power-domain-fix-err-handle-while-probing.patch
queue-4.4/clk-meson-fix-meson_clk_register_clks-signature-type-mismatch.patch