mirror of
https://gitee.com/openharmony/kernel_linux
synced 2025-04-16 22:30:43 +00:00
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>
43 lines
1.1 KiB
C
43 lines
1.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _TOOLS_LINUX_ASM_X86_RMWcc
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#define _TOOLS_LINUX_ASM_X86_RMWcc
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#ifdef CONFIG_CC_HAS_ASM_GOTO
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#define __GEN_RMWcc(fullop, var, cc, ...) \
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do { \
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asm_volatile_goto (fullop "; j" cc " %l[cc_label]" \
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: : "m" (var), ## __VA_ARGS__ \
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: "memory" : cc_label); \
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return 0; \
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cc_label: \
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return 1; \
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} while (0)
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#define GEN_UNARY_RMWcc(op, var, arg0, cc) \
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__GEN_RMWcc(op " " arg0, var, cc)
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#define GEN_BINARY_RMWcc(op, var, vcon, val, arg0, cc) \
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__GEN_RMWcc(op " %1, " arg0, var, cc, vcon (val))
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#else /* !CONFIG_CC_HAS_ASM_GOTO */
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#define __GEN_RMWcc(fullop, var, cc, ...) \
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do { \
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char c; \
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asm volatile (fullop "; set" cc " %1" \
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: "+m" (var), "=qm" (c) \
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: __VA_ARGS__ : "memory"); \
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return c != 0; \
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} while (0)
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#define GEN_UNARY_RMWcc(op, var, arg0, cc) \
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__GEN_RMWcc(op " " arg0, var, cc)
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#define GEN_BINARY_RMWcc(op, var, vcon, val, arg0, cc) \
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__GEN_RMWcc(op " %2, " arg0, var, cc, vcon (val))
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#endif /* CONFIG_CC_HAS_ASM_GOTO */
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#endif /* _TOOLS_LINUX_ASM_X86_RMWcc */
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