Merge tag 'kbuild-v5.20' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild

Pull Kbuild updates from Masahiro Yamada:

 - Remove the support for -O3 (CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3)

 - Fix error of rpm-pkg cross-builds

 - Support riscv for checkstack tool

 - Re-enable -Wformwat warnings for Clang

 - Clean up modpost, Makefiles, and misc scripts

* tag 'kbuild-v5.20' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild: (30 commits)
  modpost: remove .symbol_white_list field entirely
  modpost: remove unneeded .symbol_white_list initializers
  modpost: add PATTERNS() helper macro
  modpost: shorten warning messages in report_sec_mismatch()
  Revert "Kbuild, lto, workaround: Don't warn for initcall_reference in modpost"
  modpost: use more reliable way to get fromsec in section_rel(a)()
  modpost: add array range check to sec_name()
  modpost: refactor get_secindex()
  kbuild: set EXIT trap before creating temporary directory
  modpost: remove unused Elf_Sword macro
  Makefile.extrawarn: re-enable -Wformat for clang
  kbuild: add dtbs_prepare target
  kconfig: Qt5: tell the user which packages are required
  modpost: use sym_get_data() to get module device_table data
  modpost: drop executable ELF support
  checkstack: add riscv support for scripts/checkstack.pl
  kconfig: shorten the temporary directory name for cc-option
  scripts: headers_install.sh: Update config leak ignore entries
  kbuild: error out if $(INSTALL_MOD_PATH) contains % or :
  kbuild: error out if $(KBUILD_EXTMOD) contains % or :
  ...

1 files changed, 5 insertions, 11 deletions

diff --git a/init/Kconfig b/init/Kconfig
index 922848a094d7..80fe60fa77fb 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1411,13 +1411,6 @@ config CC_OPTIMIZE_FOR_PERFORMANCE
 	  with the "-O2" compiler flag for best performance and most
 	  helpful compile-time warnings.
 
-config CC_OPTIMIZE_FOR_PERFORMANCE_O3
-	bool "Optimize more for performance (-O3)"
-	depends on ARC
-	help
-	  Choosing this option will pass "-O3" to your compiler to optimize
-	  the kernel yet more for performance.
-
 config CC_OPTIMIZE_FOR_SIZE
 	bool "Optimize for size (-Os)"
 	help
@@ -1733,16 +1726,17 @@ config KALLSYMS_ALL
 	help
 	  Normally kallsyms only contains the symbols of functions for nicer
 	  OOPS messages and backtraces (i.e., symbols from the text and inittext
-	  sections). This is sufficient for most cases. And only in very rare
-	  cases (e.g., when a debugger is used) all symbols are required (e.g.,
-	  names of variables from the data sections, etc).
+	  sections). This is sufficient for most cases. And only if you want to
+	  enable kernel live patching, or other less common use cases (e.g.,
+	  when a debugger is used) all symbols are required (i.e., names of
+	  variables from the data sections, etc).
 
 	  This option makes sure that all symbols are loaded into the kernel
 	  image (i.e., symbols from all sections) in cost of increased kernel
 	  size (depending on the kernel configuration, it may be 300KiB or
 	  something like this).
 
-	  Say N unless you really need all symbols.
+	  Say N unless you really need all symbols, or kernel live patching.
 
 config KALLSYMS_ABSOLUTE_PERCPU
 	bool