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start_kernel: Omit prevent_tail_call_optimization() for newer toolchains

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prevent_tail_call_optimization() was added in
commit a9a3ed1eff ("x86: Fix early boot crash on gcc-10, third try")
to work around stack canaries getting inserted into functions that would
initialize the stack canary in the first place.

Now that we have no_stack_protector function attribute (gcc-11+,
clang-7+) and use it on start_kernel(), remove the call to
prevent_tail_call_optimization() such that we may one day remove it
outright.

Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
Link: https://lore.kernel.org/r/20230412-no_stackp-v2-2-116f9fe4bbe7@google.com
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
This commit is contained in:
ndesaulniers@google.com 2023-04-17 15:00:06 -07:00 committed by Josh Poimboeuf
parent 514ca14ed5
commit dc1d05536f
1 changed files with 6 additions and 0 deletions
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6
init/main.c
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@ -1088,7 +1088,13 @@ void start_kernel(void)
/* Do the rest non-__init'ed, we're now alive */
arch_call_rest_init();
/*
* Avoid stack canaries in callers of boot_init_stack_canary for gcc-10
* and older.
*/
#if !__has_attribute(__no_stack_protector__)
prevent_tail_call_optimization();
#endif
}
/* Call all constructor functions linked into the kernel. */