Patch "x86/retpoline: Remove the esp/rsp thunk" has been added to the 4.9-stable tree

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

x86/retpoline: Remove the esp/rsp thunk

to the 4.9-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:
x86-retpoline-remove-the-esp-rsp-thunk.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Waiman Long <[email protected]>
Date: Mon, 22 Jan 2018 17:09:34 -0500
Subject: x86/retpoline: Remove the esp/rsp thunk

From: Waiman Long <[email protected]>

(cherry picked from commit 1df37383a8aeabb9b418698f0bcdffea01f4b1b2)

It doesn't make sense to have an indirect call thunk with esp/rsp as retpoline code won't work correctly with the stack pointer register. Removing it will help compiler writers to catch error in case such a thunk call is emitted incorrectly.

---
 arch/x86/include/asm/asm-prototypes.h |    1 -
 arch/x86/lib/retpoline.S              |    1 -
 2 files changed, 2 deletions(-)

@@ -37,5 +37,4 @@ INDIRECT_THUNK(dx)
 INDIRECT_THUNK(si)
 INDIRECT_THUNK(di)
 INDIRECT_THUNK(bp)
-INDIRECT_THUNK(sp)
 #endif /* CONFIG_RETPOLINE */

@@ -36,7 +36,6 @@ GENERATE_THUNK(_ASM_DX)
 GENERATE_THUNK(_ASM_SI)
 GENERATE_THUNK(_ASM_DI)
 GENERATE_THUNK(_ASM_BP)
-GENERATE_THUNK(_ASM_SP)
 #ifdef CONFIG_64BIT
 GENERATE_THUNK(r8)
 GENERATE_THUNK(r9)

Patches currently in stable-queue which might be from [email protected] are

queue-4.9/x86-retpoline-remove-the-esp-rsp-thunk.patch