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x86/percpu: Enable named address spaces for all capable GCC versions

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Enable named address spaces also for GCC 6, GCC 7 and GCC 8
releases. These compilers all produce kernel images that boot
without problems.

Use compile-time test to detect compiler support for named
address spaces. The test passes with GCC 6 as the earliest
compiler version where the support for named address spaces
was introduced.

Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20240520082134.121320-1-ubizjak@gmail.com
This commit is contained in:
Uros Bizjak 2024-05-20 10:21:14 +02:00 committed by Ingo Molnar
parent 9130ea0616
commit 47ff30cc1b
1 changed files with 2 additions and 1 deletions
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arch/x86/Kconfig
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@ -2430,7 +2430,8 @@ source "kernel/livepatch/Kconfig"
endmenu
config CC_HAS_NAMED_AS
def_bool CC_IS_GCC && GCC_VERSION >= 90100
def_bool $(success,echo 'int __seg_fs fs; int __seg_gs gs;' | $(CC) -x c - -S -o /dev/null)
depends on CC_IS_GCC
config CC_HAS_NAMED_AS_FIXED_SANITIZERS
def_bool CC_IS_GCC && GCC_VERSION >= 130300