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684f978347
Letting WARN_ON/WARN_ON_ONCE return the condition means that you could do
if (WARN_ON(blah)) {
handle_impossible_case
}
Rather than
if (unlikely(blah)) {
WARN_ON(1)
handle_impossible_case
}
I checked all the newly added WARN_ON_ONCE users and none of them test the
return status so we can still change it.
[akpm@osdl.org: warning fix]
[akpm@osdl.org: build fix]
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
101 lines
2.5 KiB
C
101 lines
2.5 KiB
C
#ifndef _ASM_POWERPC_BUG_H
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#define _ASM_POWERPC_BUG_H
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#ifdef __KERNEL__
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#include <asm/asm-compat.h>
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/*
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* Define an illegal instr to trap on the bug.
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* We don't use 0 because that marks the end of a function
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* in the ELF ABI. That's "Boo Boo" in case you wonder...
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*/
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#define BUG_OPCODE .long 0x00b00b00 /* For asm */
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#define BUG_ILLEGAL_INSTR "0x00b00b00" /* For BUG macro */
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#ifndef __ASSEMBLY__
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struct bug_entry {
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unsigned long bug_addr;
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long line;
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const char *file;
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const char *function;
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};
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struct bug_entry *find_bug(unsigned long bugaddr);
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/*
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* If this bit is set in the line number it means that the trap
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* is for WARN_ON rather than BUG or BUG_ON.
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*/
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#define BUG_WARNING_TRAP 0x1000000
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#ifdef CONFIG_BUG
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/*
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* BUG_ON() and WARN_ON() do their best to cooperate with compile-time
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* optimisations. However depending on the complexity of the condition
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* some compiler versions may not produce optimal results.
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*/
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#define BUG() do { \
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__asm__ __volatile__( \
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"1: twi 31,0,0\n" \
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".section __bug_table,\"a\"\n" \
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"\t"PPC_LONG" 1b,%0,%1,%2\n" \
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".previous" \
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: : "i" (__LINE__), "i" (__FILE__), "i" (__FUNCTION__)); \
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} while (0)
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#define BUG_ON(x) do { \
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if (__builtin_constant_p(x)) { \
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if (x) \
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BUG(); \
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} else { \
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__asm__ __volatile__( \
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"1: "PPC_TLNEI" %0,0\n" \
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".section __bug_table,\"a\"\n" \
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"\t"PPC_LONG" 1b,%1,%2,%3\n" \
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".previous" \
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: : "r" ((long)(x)), "i" (__LINE__), \
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"i" (__FILE__), "i" (__FUNCTION__)); \
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} \
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} while (0)
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#define __WARN() do { \
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__asm__ __volatile__( \
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"1: twi 31,0,0\n" \
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".section __bug_table,\"a\"\n" \
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"\t"PPC_LONG" 1b,%0,%1,%2\n" \
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".previous" \
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: : "i" (__LINE__ + BUG_WARNING_TRAP), \
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"i" (__FILE__), "i" (__FUNCTION__)); \
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} while (0)
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#define WARN_ON(x) ({ \
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typeof(x) __ret_warn_on = (x); \
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if (__builtin_constant_p(__ret_warn_on)) { \
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if (__ret_warn_on) \
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__WARN(); \
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} else { \
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__asm__ __volatile__( \
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"1: "PPC_TLNEI" %0,0\n" \
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".section __bug_table,\"a\"\n" \
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"\t"PPC_LONG" 1b,%1,%2,%3\n" \
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".previous" \
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: : "r" (__ret_warn_on), \
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"i" (__LINE__ + BUG_WARNING_TRAP), \
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"i" (__FILE__), "i" (__FUNCTION__)); \
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} \
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unlikely(__ret_warn_on); \
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})
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#define HAVE_ARCH_BUG
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#define HAVE_ARCH_BUG_ON
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#define HAVE_ARCH_WARN_ON
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#endif /* CONFIG_BUG */
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#endif /* __ASSEMBLY __ */
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#include <asm-generic/bug.h>
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#endif /* __KERNEL__ */
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#endif /* _ASM_POWERPC_BUG_H */
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