0276ebf166
commit e9666d10a5677a494260d60d1fa0b73cc7646eb3 upstream.
Currently, CONFIG_JUMP_LABEL just means "I _want_ to use jump label".
The jump label is controlled by HAVE_JUMP_LABEL, which is defined
like this:
#if defined(CC_HAVE_ASM_GOTO) && defined(CONFIG_JUMP_LABEL)
# define HAVE_JUMP_LABEL
#endif
We can improve this by testing 'asm goto' support in Kconfig, then
make JUMP_LABEL depend on CC_HAS_ASM_GOTO.
Ugly #ifdef HAVE_JUMP_LABEL will go away, and CONFIG_JUMP_LABEL will
match to the real kernel capability.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc)
Tested-by: Sedat Dilek <sedat.dilek@gmail.com>
[nc: Fix trivial conflicts in 4.19
arch/xtensa/kernel/jump_label.c doesn't exist yet
Ensured CC_HAVE_ASM_GOTO and HAVE_JUMP_LABEL were sufficiently
eliminated]
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
22 lines
511 B
Bash
Executable file
22 lines
511 B
Bash
Executable file
#!/bin/sh
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# SPDX-License-Identifier: GPL-2.0
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# Test for gcc 'asm goto' support
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# Copyright (C) 2010, Jason Baron <jbaron@redhat.com>
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cat << "END" | $@ -x c - -fno-PIE -c -o /dev/null
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int main(void)
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{
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#if defined(__arm__) || defined(__aarch64__)
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/*
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* Not related to asm goto, but used by jump label
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* and broken on some ARM GCC versions (see GCC Bug 48637).
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*/
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static struct { int dummy; int state; } tp;
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asm (".long %c0" :: "i" (&tp.state));
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#endif
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entry:
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asm goto ("" :::: entry);
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return 0;
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}
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END
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