Kbuild fixes for 6.18 #1

- Fix UAPI types check in headers_check.pl
 
 - Only enable -Werror for hostprogs with CONFIG_WERROR / W=e
 
 - Ignore fsync() error when output of gen_init_cpio is a pipe
 
 - Several little build fixes for recent modules.builtin.modinfo series
 
 Signed-off-by: Nathan Chancellor <nathan@kernel.org>
 -----BEGIN PGP SIGNATURE-----
 
 iHUEABYKAB0WIQR74yXHMTGczQHYypIdayaRccAalgUCaOqyGgAKCRAdayaRccAa
 lhIaAP4owzRbZv/KnwVgXt3IDlAN7tOJQyiNbuAOTTH9IewvhAEA24zfrlav7CQl
 WSc0d/poWAdmQJc0T/bdQ71G69j6dgQ=
 =ljuS
 -----END PGP SIGNATURE-----

Merge tag 'kbuild-fixes-6.18-1' of git://git.kernel.org/pub/scm/linux/kernel/git/kbuild/linux

Pull Kbuild fixes from Nathan Chancellor:

 - Fix UAPI types check in headers_check.pl

 - Only enable -Werror for hostprogs with CONFIG_WERROR / W=e

 - Ignore fsync() error when output of gen_init_cpio is a pipe

 - Several little build fixes for recent modules.builtin.modinfo series

* tag 'kbuild-fixes-6.18-1' of git://git.kernel.org/pub/scm/linux/kernel/git/kbuild/linux:
  kbuild: Use '--strip-unneeded-symbol' for removing module device table symbols
  s390/vmlinux.lds.S: Move .vmlinux.info to end of allocatable sections
  kbuild: Add '.rel.*' strip pattern for vmlinux
  kbuild: Restore pattern to avoid stripping .rela.dyn from vmlinux
  gen_init_cpio: Ignore fsync() returning EINVAL on pipes
  scripts/Makefile.extrawarn: Respect CONFIG_WERROR / W=e for hostprogs
  kbuild: uapi: Strip comments before size type check
This commit is contained in:
Linus Torvalds 2025-10-11 15:47:12 -07:00
commit c04022dccb
5 changed files with 38 additions and 28 deletions

View File

@ -214,6 +214,28 @@ SECTIONS
DWARF_DEBUG
ELF_DETAILS
/*
* Make sure that the .got.plt is either completely empty or it
* contains only the three reserved double words.
*/
.got.plt : {
*(.got.plt)
}
ASSERT(SIZEOF(.got.plt) == 0 || SIZEOF(.got.plt) == 0x18, "Unexpected GOT/PLT entries detected!")
/*
* Sections that should stay zero sized, which is safer to
* explicitly check instead of blindly discarding.
*/
.plt : {
*(.plt) *(.plt.*) *(.iplt) *(.igot .igot.plt)
}
ASSERT(SIZEOF(.plt) == 0, "Unexpected run-time procedure linkages detected!")
.rela.dyn : {
*(.rela.*) *(.rela_*)
}
ASSERT(SIZEOF(.rela.dyn) == 0, "Unexpected run-time relocations (.rela) detected!")
/*
* uncompressed image info used by the decompressor
* it should match struct vmlinux_info
@ -244,28 +266,6 @@ SECTIONS
#endif
} :NONE
/*
* Make sure that the .got.plt is either completely empty or it
* contains only the three reserved double words.
*/
.got.plt : {
*(.got.plt)
}
ASSERT(SIZEOF(.got.plt) == 0 || SIZEOF(.got.plt) == 0x18, "Unexpected GOT/PLT entries detected!")
/*
* Sections that should stay zero sized, which is safer to
* explicitly check instead of blindly discarding.
*/
.plt : {
*(.plt) *(.plt.*) *(.iplt) *(.igot .igot.plt)
}
ASSERT(SIZEOF(.plt) == 0, "Unexpected run-time procedure linkages detected!")
.rela.dyn : {
*(.rela.*) *(.rela_*)
}
ASSERT(SIZEOF(.rela.dyn) == 0, "Unexpected run-time relocations (.rela) detected!")
/* Sections to be discarded */
DISCARDS
/DISCARD/ : {

View File

@ -223,9 +223,11 @@ KBUILD_USERCFLAGS += -Werror
KBUILD_USERLDFLAGS += -Wl,--fatal-warnings
KBUILD_RUSTFLAGS += -Dwarnings
endif
# Hostprog flags are used during build bootstrapping and can not rely on CONFIG_ symbols.
# While hostprog flags are used during build bootstrapping (thus should not
# depend on CONFIG_ symbols), -Werror is disruptive and should be opted into.
# Only apply -Werror to hostprogs built after the initial Kconfig stage.
KBUILD_HOSTCFLAGS += -Werror
KBUILD_HOSTLDFLAGS += -Wl,--fatal-warnings
KBUILD_HOSTRUSTFLAGS += -Dwarnings
endif

View File

@ -82,9 +82,12 @@ endif
# ---------------------------------------------------------------------------
remove-section-y := .modinfo
remove-section-$(CONFIG_ARCH_VMLINUX_NEEDS_RELOCS) += '.rel*'
remove-section-$(CONFIG_ARCH_VMLINUX_NEEDS_RELOCS) += '.rel*' '!.rel*.dyn'
# for compatibility with binutils < 2.32
# https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=c12d9fa2afe7abcbe407a00e15719e1a1350c2a7
remove-section-$(CONFIG_ARCH_VMLINUX_NEEDS_RELOCS) += '.rel.*'
remove-symbols := -w --strip-symbol='__mod_device_table__*'
remove-symbols := -w --strip-unneeded-symbol='__mod_device_table__*'
# To avoid warnings: "empty loadable segment detected at ..." from GNU objcopy,
# it is necessary to remove the PT_LOAD flag from the segment.

View File

@ -112,7 +112,10 @@ static int cpio_trailer(void)
push_pad(padlen(offset, 512)) < 0)
return -1;
return fsync(outfd);
if (fsync(outfd) < 0 && errno != EINVAL)
return -1;
return 0;
}
static int cpio_mkslink(const char *name, const char *target,

View File

@ -155,6 +155,8 @@ sub check_sizetypes
if (my $included = ($line =~ /^\s*#\s*include\s+[<"](\S+)[>"]/)[0]) {
check_include_typesh($included);
}
# strip single-line comments, as types may be referenced within them
$line =~ s@/\*.*?\*/@@;
if ($line =~ m/__[us](8|16|32|64)\b/) {
printf STDERR "$filename:$lineno: " .
"found __[us]{8,16,32,64} type " .