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authorAndi Kleen <ak@suse.de>2006-09-26 04:52:29 -0400
committerAndi Kleen <andi@basil.nowhere.org>2006-09-26 04:52:29 -0400
commit1a015b5644ec6df0a2c4cbeff1f8a3d24ba0478e (patch)
tree776cc4bfdf3a6aa74269a5b8458759a2157c770a /include/asm-i386/rwlock.h
parent9a0b26e6bc4ae1979d9bcc6194e57a71b2b5cac6 (diff)
[PATCH] i386: Remove const case for rwlocks
rwlocks are now out of line, so it near never triggers. Also it was incompatible with the new dwarf2 unwinder because it had unannotiatable push/pops. Signed-off-by: Andi Kleen <ak@suse.de>
Diffstat (limited to 'include/asm-i386/rwlock.h')
-rw-r--r--include/asm-i386/rwlock.h38
1 files changed, 2 insertions, 36 deletions
diff --git a/include/asm-i386/rwlock.h b/include/asm-i386/rwlock.h
index 87c069ccba08..f40ccbd8cb7f 100644
--- a/include/asm-i386/rwlock.h
+++ b/include/asm-i386/rwlock.h
@@ -20,52 +20,18 @@
20#define RW_LOCK_BIAS 0x01000000 20#define RW_LOCK_BIAS 0x01000000
21#define RW_LOCK_BIAS_STR "0x01000000" 21#define RW_LOCK_BIAS_STR "0x01000000"
22 22
23#define __build_read_lock_ptr(rw, helper) \ 23#define __build_read_lock(rw, helper) \
24 asm volatile(LOCK_PREFIX " subl $1,(%0)\n\t" \ 24 asm volatile(LOCK_PREFIX " subl $1,(%0)\n\t" \
25 "jns 1f\n" \ 25 "jns 1f\n" \
26 "call " helper "\n\t" \ 26 "call " helper "\n\t" \
27 "1:\n" \ 27 "1:\n" \
28 ::"a" (rw) : "memory") 28 ::"a" (rw) : "memory")
29 29
30#define __build_read_lock_const(rw, helper) \ 30#define __build_write_lock(rw, helper) \
31 asm volatile(LOCK_PREFIX " subl $1,%0\n\t" \
32 "jns 1f\n" \
33 "pushl %%eax\n\t" \
34 "leal %0,%%eax\n\t" \
35 "call " helper "\n\t" \
36 "popl %%eax\n\t" \
37 "1:\n" \
38 :"+m" (*(volatile int *)rw) : : "memory")
39
40#define __build_read_lock(rw, helper) do { \
41 if (__builtin_constant_p(rw)) \
42 __build_read_lock_const(rw, helper); \
43 else \
44 __build_read_lock_ptr(rw, helper); \
45 } while (0)
46
47#define __build_write_lock_ptr(rw, helper) \
48 asm volatile(LOCK_PREFIX " subl $" RW_LOCK_BIAS_STR ",(%0)\n\t" \ 31 asm volatile(LOCK_PREFIX " subl $" RW_LOCK_BIAS_STR ",(%0)\n\t" \
49 "jz 1f\n" \ 32 "jz 1f\n" \
50 "call " helper "\n\t" \ 33 "call " helper "\n\t" \
51 "1:\n" \ 34 "1:\n" \
52 ::"a" (rw) : "memory") 35 ::"a" (rw) : "memory")
53 36
54#define __build_write_lock_const(rw, helper) \
55 asm volatile(LOCK_PREFIX " subl $" RW_LOCK_BIAS_STR ",%0\n\t" \
56 "jz 1f\n" \
57 "pushl %%eax\n\t" \
58 "leal %0,%%eax\n\t" \
59 "call " helper "\n\t" \
60 "popl %%eax\n\t" \
61 "1:\n" \
62 :"+m" (*(volatile int *)rw) : : "memory")
63
64#define __build_write_lock(rw, helper) do { \
65 if (__builtin_constant_p(rw)) \
66 __build_write_lock_const(rw, helper); \
67 else \
68 __build_write_lock_ptr(rw, helper); \
69 } while (0)
70
71#endif 37#endif