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arm64: kconfig: Update and comment GCC version check for kernel BTI 

Some versions of GCC are known to suffer from a BTI code generation bug,
meaning that CONFIG_CC_HAS_BRANCH_PROT_PAC_RET_BTI cannot be solely used
to determine whether or not we can compile with kernel with BTI enabled.

Update the BTI Kconfig entry to refer to the relevant GCC bugzilla entry
(https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94697) and update the check
now that the fix has been merged into GCC release 10.1.

Acked-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Will Deacon 2020-05-12 12:45:40 +01:00
parent bf740a905f
commit 3a88d7c5c9
1 changed files with 2 additions and 1 deletions
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arch/arm64/Kconfig
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@ -1616,7 +1616,8 @@ config ARM64_BTI_KERNEL
depends on ARM64_BTI
depends on ARM64_PTR_AUTH
depends on CC_HAS_BRANCH_PROT_PAC_RET_BTI
depends on !CC_IS_GCC || GCC_VERSION >= 100000
# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94697
depends on !CC_IS_GCC || GCC_VERSION >= 100100
depends on !(CC_IS_CLANG && GCOV_KERNEL)
depends on (!FUNCTION_GRAPH_TRACER || DYNAMIC_FTRACE_WITH_REGS)
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