[tip:x86/cpu] kbuild: Raise the minimum required binutils version to 2.21

[tip-bot for Chang S. Bae]

Commit-ID:  1fb12b35e5ffe379d109b22cb3069830d0136d9a
Gitweb:     https://git.kernel.org/tip/1fb12b35e5ffe379d109b22cb3069830d0136d9a
Author:     Chang S. Bae <chang.seok.bae@xxxxxxxxx>
AuthorDate: Wed, 8 May 2019 03:02:19 -0700
Committer:  Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitDate: Sat, 22 Jun 2019 11:38:51 +0200

kbuild: Raise the minimum required binutils version to 2.21

It helps to use some new instructions directly in assembly code.

Suggested-by: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Signed-off-by: Chang S. Bae <chang.seok.bae@xxxxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Reviewed-by: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Acked-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxx>
Cc: Ravi Shankar <ravi.v.shankar@xxxxxxxxx>
Cc: Linux Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: H. Peter Anvin <hpa@xxxxxxxxx>
Link: https://lkml.kernel.org/r/1557309753-24073-5-git-send-email-chang.seok.bae@xxxxxxxxx

---
 Documentation/process/changes.rst | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/Documentation/process/changes.rst b/Documentation/process/changes.rst
index 18735dc460a0..0a18075c485e 100644
--- a/Documentation/process/changes.rst
+++ b/Documentation/process/changes.rst
@@ -31,7 +31,7 @@ you probably needn't concern yourself with isdn4k-utils.
 ====================== ===============  ========================================
 GNU C                  4.6              gcc --version
 GNU make               3.81             make --version
-binutils               2.20             ld -v
+binutils               2.21             ld -v
 flex                   2.5.35           flex --version
 bison                  2.0              bison --version
 util-linux             2.10o            fdformat --version
@@ -77,9 +77,7 @@ You will need GNU make 3.81 or later to build the kernel.
 Binutils
 --------
 
-The build system has, as of 4.13, switched to using thin archives (`ar T`)
-rather than incremental linking (`ld -r`) for built-in.a intermediate steps.
-This requires binutils 2.20 or newer.
+Binutils 2.21 or newer is needed to build the kernel.
 
 pkg-config
 ----------