patches: add notes about CONFIG_WERROR

patches/v3.0/0000-cover-letter.patch

@@ -1,6 +1,6 @@
-From d005c3b310f93a00709a82b51c897f869c8178c0 Mon Sep 17 00:00:00 2001
+From 28b4ad5dfa7f77f490b6c321c131f7ea694d5e76 Mon Sep 17 00:00:00 2001
 From: Wentao Zhang <[email protected]>
-Date: Mon, 16 Sep 2024 19:16:54 -0500
+Date: Wed, 25 Sep 2024 14:39:04 -0500
 Subject: [PATCH v3 0/4] Enable measuring the kernel's Source-based Code Coverage and MC/DC with Clang
 
 This series adds support for building x86-64 kernels with Clang's Source-
@@ -128,7 +128,9 @@ due to kernel size. As of LLVM 19 the max number of conditions possible is
 32767.
 
 As of LLVM 19, certain expressions are still not covered, and will produce
-build warnings when they are encountered:
+build warnings when they are encountered. Consequently, to measure kernel's
+MC/DC, CONFIG_WERROR has to be disabled at this moment for successfully
+build the kernel.
 
 "[...] if a boolean expression is embedded in the nest of another boolean
  expression but separated by a non-logical operator, this is also not
@@ -150,7 +152,9 @@ build warnings when they are encountered:
 ---
 v2 -> v3:
 
-* Rebased onto v6.11 from v6.11-rc7.
+* No functional changes.
+* Rebased onto v6.11 from v6.11-rc6.
+* Add notes about CONFIG_WERROR.
 
 ---
 
@@ -167,13 +171,13 @@ Wentao Zhang (4):
  arch/x86/kernel/vmlinux.lds.S     |   2 +
  include/asm-generic/vmlinux.lds.h |  36 +++++
  kernel/Makefile                   |   1 +
- kernel/llvm-cov/Kconfig           | 100 ++++++++++++
+ kernel/llvm-cov/Kconfig           | 101 ++++++++++++
  kernel/llvm-cov/Makefile          |   5 +
  kernel/llvm-cov/fs.c              | 253 ++++++++++++++++++++++++++++++
  kernel/llvm-cov/llvm-cov.h        | 156 ++++++++++++++++++
  scripts/Makefile.lib              |  23 +++
  scripts/mod/modpost.c             |   2 +
- 13 files changed, 592 insertions(+), 1 deletion(-)
+ 13 files changed, 593 insertions(+), 1 deletion(-)
  create mode 100644 kernel/llvm-cov/Kconfig
  create mode 100644 kernel/llvm-cov/Makefile
  create mode 100644 kernel/llvm-cov/fs.c

patches/v3.0/0002-llvm-cov-add-Clang-s-MC-DC-support.patch

@@ -1,4 +1,4 @@
-From 16c9591109564f353e31769f7775f38dca195496 Mon Sep 17 00:00:00 2001
+From bd8e4b2282e4051b6f349c020e7ebff8e262dcab Mon Sep 17 00:00:00 2001
 From: Wentao Zhang <[email protected]>
 Date: Fri, 30 Aug 2024 14:49:24 -0500
 Subject: [PATCH v3 2/4] llvm-cov: add Clang's MC/DC support
@@ -73,9 +73,9 @@ Reviewed-by: Chuck Wolber <[email protected]>
 Tested-by: Chuck Wolber <[email protected]>
 ---
  Makefile                |  6 ++++++
- kernel/llvm-cov/Kconfig | 36 ++++++++++++++++++++++++++++++++++++
+ kernel/llvm-cov/Kconfig | 37 +++++++++++++++++++++++++++++++++++++
  scripts/Makefile.lib    | 12 ++++++++++++
- 3 files changed, 54 insertions(+)
+ 3 files changed, 55 insertions(+)
 
 diff --git a/Makefile b/Makefile
 index 323af7343..590e96532 100644
@@ -95,10 +95,10 @@ index 323af7343..590e96532 100644
  ifdef CONFIG_CC_IS_GCC
  CFLAGS_GCOV	+= -fno-tree-loop-im
 diff --git a/kernel/llvm-cov/Kconfig b/kernel/llvm-cov/Kconfig
-index 9241fdfb0..66259e1f2 100644
+index 9241fdfb0..8482d94f0 100644
 --- a/kernel/llvm-cov/Kconfig
 +++ b/kernel/llvm-cov/Kconfig
-@@ -61,4 +61,40 @@ config LLVM_COV_PROFILE_ALL
+@@ -61,4 +61,41 @@ config LLVM_COV_PROFILE_ALL
  	  Note that a kernel compiled with profiling flags will be significantly
  	  larger and run slower.
 
@@ -115,7 +115,8 @@ index 9241fdfb0..66259e1f2 100644
 +	  This will add Clang's Source-based Code Coverage MC/DC
 +	  instrumentation to your kernel. As of LLVM 19, certain expressions
 +	  are still not covered, and will produce build warnings when they are
-+	  encountered.
++	  encountered. Consequently, this option should not coexist with
++	  CONFIG_WERROR=y that is the default of x86-64.
 +
 +	  "[...] if a boolean expression is embedded in the nest of another
 +	   boolean expression but separated by a non-logical operator, this is

patches/v3.0/0003-x86-disable-llvm-cov-instrumentation.patch

@@ -1,4 +1,4 @@
-From 90bb13a445e95fade37930fd83322f9e2cf3202a Mon Sep 17 00:00:00 2001
+From 5344da08af40fa40e634076084967e7ef7407d16 Mon Sep 17 00:00:00 2001
 From: Wentao Zhang <[email protected]>
 Date: Fri, 30 Aug 2024 14:48:53 -0500
 Subject: [PATCH v3 3/4] x86: disable llvm-cov instrumentation

patches/v3.0/0004-x86-enable-llvm-cov-support.patch

@@ -1,4 +1,4 @@
-From d005c3b310f93a00709a82b51c897f869c8178c0 Mon Sep 17 00:00:00 2001
+From 28b4ad5dfa7f77f490b6c321c131f7ea694d5e76 Mon Sep 17 00:00:00 2001
 From: Wentao Zhang <[email protected]>
 Date: Fri, 30 Aug 2024 14:49:06 -0500
 Subject: [PATCH v3 4/4] x86: enable llvm-cov support