Re: smp/up alternatives crash when CONFIG_HOTPLUG_CPU
From: Ingo Molnar
Date: Fri Apr 21 2006 - 03:45:16 EST
* Ingo Molnar <mingo@xxxxxxx> wrote:
> * Linus Torvalds <torvalds@xxxxxxxx> wrote:
>
> > There must be another bug there somewhere. It's not about cache
> > coherency.
>
> ok. Maybe it's in one of the patches i have applied. I'll re-check
> with vanilla.
ok, found the bug after quite some debugging - it seems to be caused by
a tools bug related to section nesting, which triggered with some valid
changes to mutex.c i had in my tree, but which changes are not upstream.
to reproduce the bug on vanilla, turn on CONFIG_DEBUG_MUTEXES and apply
the hack-patch i attached (WARNING: it is a totally broken,
non-functional patch, it just demonstrates the build bug! This is a
minimalized version of the effects the locking-correctness prover i'm
working has on mutex.c)
with that done i get these warnings from the assembler:
CC kernel/mutex.o
{standard input}: Assembler messages:
{standard input}:226: Warning: .space or .fill with negative value, ignored
{standard input}:314: Warning: .space or .fill with negative value, ignored
{standard input}:371: Warning: .space or .fill with negative value, ignored
{standard input}:533: Warning: .space or .fill with negative value, ignored
{standard input}:586: Warning: .space or .fill with negative value, ignored
you can also try the mutex.bad.s file i attached:
$ as mutex.s.bad
mutex.s.bad: Assembler messages:
mutex.s.bad:267: Warning: .space or .fill with negative value, ignored
mutex.s.bad:355: Warning: .space or .fill with negative value, ignored
mutex.s.bad:412: Warning: .space or .fill with negative value, ignored
mutex.s.bad:574: Warning: .space or .fill with negative value, ignored
mutex.s.bad:627: Warning: .space or .fill with negative value, ignored
which is caused by the following, pretty valid assembly code of the
smp-alternatives feature:
.fill 662b-661b,1,0x42
this is only a build-time warning, but the .smp_altinstr_replacement
sections get fatally mis-sized due to this, and this caused the
cpu-hotplug related crash i reported.
i dont know the precise reason why this is causing problems for the
assembler - the assembly code is 100% perfect AFAICS, but it's related
to section nesting: when i move around the first such .fill instance
within the .s assembly file, it suddenly starts working. In particular,
moving the first .smp_altinstr_replacement section to within the
.sched.text section made things work fine. This is true even if
.smp_altinstr_replacement is an empty section - the assembler gets
confused. I tried multiple versions of gas:
GNU assembler 2.16.91.0.3 20050821
GNU assembler 2.16.91.0.6 20060212
all produce this problem.
This led me to the second patch below: moving mutex_trylock into __sched
works around the problem.
Ingo
NOT-Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
Index: linux/kernel/mutex.c
===================================================================
--- linux.orig/kernel/mutex.c
+++ linux/kernel/mutex.c
@@ -30,6 +30,19 @@
# include <asm/mutex.h>
#endif
+#undef spin_lock_mutex
+#undef spin_unlock_mutex
+
+#define spin_lock_mutex(lock) \
+ do { \
+ __raw_spin_lock(&(lock)->raw_lock); \
+ } while (0)
+
+#define spin_unlock_mutex(lock) \
+ do { \
+ __raw_spin_unlock(&(lock)->raw_lock); \
+ } while (0)
+
/***
* mutex_init - initialize the mutex
* @lock: the mutex to be initialized
--------------
From: Ingo Molnar <mingo@xxxxxxx>
work around weird section nesting build bug causing smp-alternatives
failures under certain circumstances.
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
----
kernel/mutex.c | 2 +-
1 files changed, 1 insertion(+), 1 deletion(-)
Index: linux/kernel/mutex.c
===================================================================
--- linux.orig/kernel/mutex.c
+++ linux/kernel/mutex.c
@@ -306,7 +306,7 @@ static inline int __mutex_trylock_slowpa
* This function must not be used in interrupt context. The
* mutex must be released by the same task that acquired it.
*/
-int fastcall mutex_trylock(struct mutex *lock)
+int fastcall __sched mutex_trylock(struct mutex *lock)
{
return __mutex_fastpath_trylock(&lock->count,
__mutex_trylock_slowpath);
.file "mutex.c"
# GNU C version 4.0.2 20051125 (Red Hat 4.0.2-8) (i386-redhat-linux)
# compiled by GNU C version 4.0.2 20051125 (Red Hat 4.0.2-8).
# GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
# options passed: -nostdinc -Iinclude -Iinclude/asm-i386/mach-default
# -D__KERNEL__ -DKBUILD_STR(s)=#s -DKBUILD_BASENAME=KBUILD_STR(mutex)
# -DKBUILD_MODNAME=KBUILD_STR(mutex) -isystem -include -MD -m32
# -msoft-float -mpreferred-stack-boundary=2 -march=i686 -mtune=pentium3
# -auxbase-strip -Os -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs
# -Wdeclaration-after-statement -Wno-pointer-sign -fno-strict-aliasing
# -fno-common -fno-omit-frame-pointer -fno-optimize-sibling-calls
# -ffreestanding -fverbose-asm
# options enabled: -falign-loops -fargument-alias -fbranch-count-reg
# -fcaller-saves -fcprop-registers -fcrossjumping -fcse-follow-jumps
# -fcse-skip-blocks -fdefer-pop -fdelete-null-pointer-checks
# -feliminate-unused-debug-types -fexpensive-optimizations -fforce-mem
# -ffunction-cse -fgcse -fgcse-lm -fguess-branch-probability -fident
# -fif-conversion -fif-conversion2 -finline-functions
# -finline-functions-called-once -fivopts -fkeep-static-consts
# -fleading-underscore -floop-optimize -floop-optimize2 -fmath-errno
# -fmerge-constants -foptimize-register-move -fpcc-struct-return -fpeephole
# -fpeephole2 -fregmove -freorder-functions -frerun-cse-after-loop
# -frerun-loop-opt -fsched-interblock -fsched-spec
# -fsched-stalled-insns-dep -fschedule-insns2 -fsplit-ivs-in-unroller
# -fstrength-reduce -fthread-jumps -ftrapping-math -ftree-ccp
# -ftree-copyrename -ftree-dce -ftree-dominator-opts -ftree-dse -ftree-fre
# -ftree-loop-im -ftree-loop-ivcanon -ftree-loop-optimize -ftree-lrs
# -ftree-sra -ftree-ter -funit-at-a-time -fverbose-asm
# -fzero-initialized-in-bss -mieee-fp -mno-fancy-math-387 -mno-red-zone
# -mtls-direct-seg-refs -mtune=pentium3 -march=i686
# -mpreferred-stack-boundary=2
.section __ksymtab,"a",@progbits
.align 4
.type __ksymtab_mutex_trylock, @object
.size __ksymtab_mutex_trylock, 8
__ksymtab_mutex_trylock:
# value:
.long mutex_trylock
# name:
.long __kstrtab_mutex_trylock
.section __ksymtab_strings,"a",@progbits
.type __kstrtab_mutex_trylock, @object
.size __kstrtab_mutex_trylock, 14
__kstrtab_mutex_trylock:
.string "mutex_trylock"
.section __ksymtab
.align 4
.type __ksymtab_mutex_lock_interruptible, @object
.size __ksymtab_mutex_lock_interruptible, 8
__ksymtab_mutex_lock_interruptible:
# value:
.long mutex_lock_interruptible
# name:
.long __kstrtab_mutex_lock_interruptible
.section __ksymtab_strings
.type __kstrtab_mutex_lock_interruptible, @object
.size __kstrtab_mutex_lock_interruptible, 25
__kstrtab_mutex_lock_interruptible:
.string "mutex_lock_interruptible"
.section __ksymtab
.align 4
.type __ksymtab_mutex_unlock, @object
.size __ksymtab_mutex_unlock, 8
__ksymtab_mutex_unlock:
# value:
.long mutex_unlock
# name:
.long __kstrtab_mutex_unlock
.section __ksymtab_strings
.type __kstrtab_mutex_unlock, @object
.size __kstrtab_mutex_unlock, 13
__kstrtab_mutex_unlock:
.string "mutex_unlock"
.section __ksymtab
.align 4
.type __ksymtab_mutex_lock, @object
.size __ksymtab_mutex_lock, 8
__ksymtab_mutex_lock:
# value:
.long mutex_lock
# name:
.long __kstrtab_mutex_lock
.section __ksymtab_strings
.type __kstrtab_mutex_lock, @object
.size __kstrtab_mutex_lock, 11
__kstrtab_mutex_lock:
.string "mutex_lock"
.section __ksymtab
.align 4
.type __ksymtab___mutex_init, @object
.size __ksymtab___mutex_init, 8
__ksymtab___mutex_init:
# value:
.long __mutex_init
# name:
.long __kstrtab___mutex_init
.section __ksymtab_strings
.type __kstrtab___mutex_init, @object
.size __kstrtab___mutex_init, 13
__kstrtab___mutex_init:
.string "__mutex_init"
.text
.globl __mutex_init
.type __mutex_init, @function
__mutex_init:
pushl %ebp #
movl %esp, %ebp #,
pushl %ecx #
movl $1, (%eax) #, <variable>.count.counter
movl $0, -4(%ebp) #, SR.124
movl $1, -4(%ebp) #, SR.124
movl $0, 8(%eax) #, <variable>.wait_lock.break_lock
movl -4(%ebp), %ecx # SR.124, SR.124
movl %ecx, 4(%eax) # SR.124, <variable>.wait_lock.raw_lock.slock
leal 12(%eax), %ecx #, list
movl %ecx, 12(%eax) # list, <variable>.next
movl %ecx, 4(%ecx) # list, <variable>.prev
pushl %edx # name
pushl %eax # lock
call debug_mutex_init #
popl %eax #
popl %edx #
leave
ret
.size __mutex_init, .-__mutex_init
.globl mutex_trylock
.type mutex_trylock, @function
mutex_trylock:
pushl %ebp #
movl %esp, %ebp #,
pushl %esi #
pushl %ebx #
movl %eax, %ebx # lock, lock
#APP
661:
1: lock ; decb 4(%eax) # <variable>.slock
jns 3f
2: rep;nop
cmpb $0,4(%eax) # <variable>.slock
jle 2b
jmp 1b
3:
662:
.section .smp_altinstructions,"a"
.align 4
.long 661b
.long 663f
.byte 0x68
.byte 662b-661b
.byte 664f-663f
.previous
.section .smp_altinstr_replacement,"awx"
663:
decb 4(%eax) # <variable>.slock
664:
.fill 662b-661b,1,0x42
.previous
#NO_APP
orl $-1, %esi #, x
#APP
xchgl %esi,(%eax) # x,* lock
#NO_APP
cmpl $1, %esi #, x
jne .L4 #,
pushl 4(%ebp) #
movl $-4096, %eax #, tmp70
#APP
andl %esp,%eax; # tmp70
#NO_APP
pushl %eax # tmp70
pushl %ebx # lock
call debug_mutex_set_owner #
addl $12, %esp #,
.L4:
leal 12(%ebx), %eax #, head
cmpl %eax, 12(%ebx) # head, <variable>.next
jne .L6 #,
movl $0, (%ebx) #, <variable>.count.counter
.L6:
#APP
movb $1,4(%ebx) # <variable>.slock
#NO_APP
xorl %eax, %eax # tmp72
cmpl $1, %esi #, x
sete %al #, tmp72
leal -8(%ebp), %esp #,
popl %ebx #
popl %esi #
popl %ebp #
ret
.size mutex_trylock, .-mutex_trylock
.section .rodata
.type __func__.9091, @object
.size __func__.9091, 24
__func__.9091:
.string "__mutex_unlock_slowpath"
.section .rodata.str1.1,"aMS",@progbits,1
.LC0:
.string "kernel/mutex.c"
.LC1:
.string "BUG: warning at %s:%d/%s()\n"
.section .sched.text,"ax",@progbits
.type __mutex_unlock_slowpath, @function
__mutex_unlock_slowpath:
pushl %ebp #
movl %esp, %ebp #,
pushl %esi #
movl %eax, %esi # lock_count, lock
movl $-4096, %eax #, tmp74
#APP
andl %esp,%eax; # tmp74
#NO_APP
cmpl %eax, 20(%esi) # tmp74, <variable>.owner
pushl %ebx #
je .L14 #,
cmpl $0, debug_mutex_on #, debug_mutex_on
je .L14 #,
movl console_printk, %eax # console_printk, console_printk
movl $15, %edx #, tmp82
movl $0, debug_mutex_on #, debug_mutex_on
testl %eax, %eax # console_printk
cmove %eax, %edx # console_printk,, tmp82
movb debug_mutex_lock, %al #, D.9103
movl %edx, console_printk # tmp82, console_printk
testb %al, %al # D.9103
jg .L16 #,
movl $debug_mutex_lock, %eax #,
call _spin_unlock #
.L16:
pushl $__func__.9091 #
pushl $220 #
pushl $.LC0 #
pushl $.LC1 #
call printk #
call dump_stack #
addl $16, %esp #,
.L14:
#APP
661:
1: lock ; decb 4(%esi) # <variable>.slock
jns 3f
2: rep;nop
cmpb $0,4(%esi) # <variable>.slock
jle 2b
jmp 1b
3:
662:
.section .smp_altinstructions,"a"
.align 4
.long 661b
.long 663f
.byte 0x68
.byte 662b-661b
.byte 664f-663f
.previous
.section .smp_altinstr_replacement,"awx"
663:
decb 4(%esi) # <variable>.slock
664:
.fill 662b-661b,1,0x42
.previous
#NO_APP
movl $1, (%esi) #, <variable>.count.counter
pushl %esi # lock
call debug_mutex_unlock #
movl 12(%esi), %ebx # <variable>.next, D.9228
leal 12(%esi), %eax #, D.9105
cmpl %eax, %ebx # D.9105, D.9228
popl %edx #
je .L21 #,
pushl %ebx # D.9228
pushl %esi # lock
call debug_mutex_wake_waiter #
movl 8(%ebx), %eax # <variable>.task, D.9107
call wake_up_process #
popl %ebx #
popl %eax #
.L21:
movl $0, 20(%esi) #, <variable>.owner
#APP
movb $1,4(%esi) # <variable>.slock
#NO_APP
leal -8(%ebp), %esp #,
popl %ebx #
popl %esi #
popl %ebp #
ret
.size __mutex_unlock_slowpath, .-__mutex_unlock_slowpath
.globl mutex_unlock
.type mutex_unlock, @function
mutex_unlock:
pushl %ebp #
movl %esp, %ebp #,
movl 4(%ebp), %edx #, tmp60
call __mutex_unlock_slowpath #
popl %ebp #
ret
.size mutex_unlock, .-mutex_unlock
.section .rodata
.type __func__.9044, @object
.size __func__.9044, 20
__func__.9044:
.string "__mutex_lock_common"
.section .sched.text
.type __mutex_lock_interruptible_slowpath, @function
__mutex_lock_interruptible_slowpath:
pushl %ebp #
movl %esp, %ebp #,
pushl %edi #
pushl %esi #
movl %eax, %esi # lock_count, lock_count
pushl %ebx #
movl $-4096, %eax #, tmp97
subl $24, %esp #,
leal -32(%ebp), %ebx #, tmp98
movl %edx, -36(%ebp) # ip, ip
#APP
andl %esp,%eax; # tmp97
#NO_APP
movl (%eax), %edi # <variable>.task, tsk
pushl %ebx # tmp98
call debug_mutex_init_waiter #
#APP
661:
1: lock ; decb 4(%esi) # <variable>.slock
jns 3f
2: rep;nop
cmpb $0,4(%esi) # <variable>.slock
jle 2b
jmp 1b
3:
662:
.section .smp_altinstructions,"a"
.align 4
.long 661b
.long 663f
.byte 0x68
.byte 662b-661b
.byte 664f-663f
.previous
.section .smp_altinstr_replacement,"awx"
663:
decb 4(%esi) # <variable>.slock
664:
.fill 662b-661b,1,0x42
.previous
#NO_APP
pushl -36(%ebp) # ip
pushl 4(%edi) # <variable>.thread_info
pushl %ebx # tmp98
pushl %esi # lock_count
call debug_mutex_add_waiter #
leal 12(%esi), %eax #, next
movl 4(%eax), %edx # <variable>.prev, prev
movl %eax, -32(%ebp) # next, waiter.list.next
movl %ebx, 4(%eax) # tmp98, <variable>.prev
movl %ebx, (%edx) # tmp98, <variable>.next
movl %edx, -28(%ebp) # prev, waiter.list.prev
addl $20, %esp #,
movl %edi, -24(%ebp) # tsk, waiter.task
.L29:
orl $-1, %eax #, tmp102
#APP
xchgl %eax,(%esi) # tmp102,* lock_count
#NO_APP
decl %eax # tmp102
movl 4(%edi), %edx # <variable>.thread_info, <variable>.thread_info
je .L30 #,
movl 8(%edx), %eax #, D.9357
testb $4, %al #, D.9357
jne .L60 #,
movl $1, (%edi) #, <variable>.state
#APP
movb $1,4(%esi) # <variable>.slock
#NO_APP
call schedule #
#APP
661:
1: lock ; decb 4(%esi) # <variable>.slock
jns 3f
2: rep;nop
cmpb $0,4(%esi) # <variable>.slock
jle 2b
jmp 1b
3:
662:
.section .smp_altinstructions,"a"
.align 4
.long 661b
.long 663f
.byte 0x68
.byte 662b-661b
.byte 664f-663f
.previous
.section .smp_altinstr_replacement,"awx"
663:
decb 4(%esi) # <variable>.slock
664:
.fill 662b-661b,1,0x42
.previous
#NO_APP
jmp .L29 #
.L30:
pushl %edx # <variable>.thread_info
leal -32(%ebp), %ebx #, tmp106
pushl %ebx # tmp106
pushl %esi # lock_count
call mutex_remove_waiter #
pushl -36(%ebp) # ip
pushl 4(%edi) # <variable>.thread_info
pushl %esi # lock_count
call debug_mutex_set_owner #
leal 12(%esi), %eax #, D.9269
addl $24, %esp #,
cmpl %eax, 12(%esi) # D.9269, <variable>.next
jne .L35 #,
movl $0, (%esi) #, <variable>.count.counter
.L35:
#APP
movb $1,4(%esi) # <variable>.slock
#NO_APP
pushl %ebx # tmp106
call debug_mutex_free_waiter #
leal 24(%esi), %eax #, D.9281
cmpl %eax, 24(%esi) # D.9281, <variable>.next
popl %ecx #
jne .L41 #,
cmpl $0, debug_mutex_on #, debug_mutex_on
je .L41 #,
movl console_printk, %eax # console_printk, console_printk
movl $15, %edx #, tmp124
movl $0, debug_mutex_on #, debug_mutex_on
testl %eax, %eax # console_printk
cmove %eax, %edx # console_printk,, tmp124
movb debug_mutex_lock, %al #, D.9286
movl %edx, console_printk # tmp124, console_printk
testb %al, %al # D.9286
jg .L43 #,
movl $debug_mutex_lock, %eax #,
call _spin_unlock #
.L43:
pushl $__func__.9044 #
pushl $198 #
pushl $.LC0 #
pushl $.LC1 #
call printk #
call dump_stack #
addl $16, %esp #,
.L41:
movl 4(%edi), %eax # <variable>.thread_info, temp.136
cmpl %eax, 20(%esi) # temp.136, <variable>.owner
je .L48 #,
cmpl $0, debug_mutex_on #, debug_mutex_on
jne .L64 #,
.L48:
xorl %eax, %eax # D.9130
jmp .L34 #
.L60:
pushl %edx # <variable>.thread_info
leal -32(%ebp), %ebx #, tmp104
pushl %ebx # tmp104
pushl %esi # lock_count
call mutex_remove_waiter #
#APP
movb $1,4(%esi) # <variable>.slock
#NO_APP
pushl %ebx # tmp104
call debug_mutex_free_waiter #
movl $-4, %eax #, D.9130
jmp .L65 #
.L64:
movl console_printk, %eax # console_printk, console_printk
movl $15, %edx #, tmp127
movl $0, debug_mutex_on #, debug_mutex_on
testl %eax, %eax # console_printk
cmove %eax, %edx # console_printk,, tmp127
movb debug_mutex_lock, %al #, D.9291
movl %edx, console_printk # tmp127, console_printk
testb %al, %al # D.9291
jg .L54 #,
movl $debug_mutex_lock, %eax #,
call _spin_unlock #
.L54:
pushl $__func__.9044 #
pushl $199 #
pushl $.LC0 #
pushl $.LC1 #
call printk #
call dump_stack #
xorl %eax, %eax # D.9130
.L65:
addl $16, %esp #,
.L34:
leal -12(%ebp), %esp #,
popl %ebx #
popl %esi #
popl %edi #
popl %ebp #
ret
.size __mutex_lock_interruptible_slowpath, .-__mutex_lock_interruptible_slowpath
.globl mutex_lock_interruptible
.type mutex_lock_interruptible, @function
mutex_lock_interruptible:
pushl %ebp #
movl %esp, %ebp #,
pushl %ebx #
movl %eax, %ebx # lock, lock
pushl $270 #
pushl $.LC0 #
call __might_sleep #
movl 4(%ebp), %edx #, tmp62
movl %ebx, %eax # lock, lock
call __mutex_lock_interruptible_slowpath #
movl -4(%ebp), %ebx #,
leave
ret
.size mutex_lock_interruptible, .-mutex_lock_interruptible
.type __mutex_lock_slowpath, @function
__mutex_lock_slowpath:
pushl %ebp #
movl %esp, %ebp #,
pushl %edi #
pushl %esi #
movl %eax, %esi # lock_count, lock_count
pushl %ebx #
movl $-4096, %eax #, tmp89
subl $24, %esp #,
leal -32(%ebp), %ebx #, tmp90
movl %edx, -36(%ebp) # ip, ip
#APP
andl %esp,%eax; # tmp89
#NO_APP
movl (%eax), %edi # <variable>.task, tsk
pushl %ebx # tmp90
call debug_mutex_init_waiter #
#APP
661:
1: lock ; decb 4(%esi) # <variable>.slock
jns 3f
2: rep;nop
cmpb $0,4(%esi) # <variable>.slock
jle 2b
jmp 1b
3:
662:
.section .smp_altinstructions,"a"
.align 4
.long 661b
.long 663f
.byte 0x68
.byte 662b-661b
.byte 664f-663f
.previous
.section .smp_altinstr_replacement,"awx"
663:
decb 4(%esi) # <variable>.slock
664:
.fill 662b-661b,1,0x42
.previous
#NO_APP
pushl -36(%ebp) # ip
pushl 4(%edi) # <variable>.thread_info
pushl %ebx # tmp90
pushl %esi # lock_count
call debug_mutex_add_waiter #
leal 12(%esi), %eax #, next
movl 4(%eax), %edx # <variable>.prev, prev
movl %eax, -32(%ebp) # next, waiter.list.next
movl %ebx, 4(%eax) # tmp90, <variable>.prev
movl %ebx, (%edx) # tmp90, <variable>.next
movl %edx, -28(%ebp) # prev, waiter.list.prev
addl $20, %esp #,
movl %edi, -24(%ebp) # tsk, waiter.task
.L69:
orl $-1, %eax #, tmp94
#APP
xchgl %eax,(%esi) # tmp94,* lock_count
#NO_APP
decl %eax # tmp94
je .L70 #,
movl $2, (%edi) #, <variable>.state
#APP
movb $1,4(%esi) # <variable>.slock
#NO_APP
call schedule #
#APP
661:
1: lock ; decb 4(%esi) # <variable>.slock
jns 3f
2: rep;nop
cmpb $0,4(%esi) # <variable>.slock
jle 2b
jmp 1b
3:
662:
.section .smp_altinstructions,"a"
.align 4
.long 661b
.long 663f
.byte 0x68
.byte 662b-661b
.byte 664f-663f
.previous
.section .smp_altinstr_replacement,"awx"
663:
decb 4(%esi) # <variable>.slock
664:
.fill 662b-661b,1,0x42
.previous
#NO_APP
jmp .L69 #
.L70:
pushl 4(%edi) # <variable>.thread_info
leal -32(%ebp), %ebx #, tmp95
pushl %ebx # tmp95
pushl %esi # lock_count
call mutex_remove_waiter #
pushl -36(%ebp) # ip
pushl 4(%edi) # <variable>.thread_info
pushl %esi # lock_count
call debug_mutex_set_owner #
leal 12(%esi), %eax #, D.9462
addl $24, %esp #,
cmpl %eax, 12(%esi) # D.9462, <variable>.next
jne .L72 #,
movl $0, (%esi) #, <variable>.count.counter
.L72:
#APP
movb $1,4(%esi) # <variable>.slock
#NO_APP
pushl %ebx # tmp95
call debug_mutex_free_waiter #
leal 24(%esi), %eax #, D.9474
cmpl %eax, 24(%esi) # D.9474, <variable>.next
popl %ebx #
jne .L78 #,
cmpl $0, debug_mutex_on #, debug_mutex_on
je .L78 #,
movl console_printk, %eax # console_printk, console_printk
movl $15, %edx #, tmp111
movl $0, debug_mutex_on #, debug_mutex_on
testl %eax, %eax # console_printk
cmove %eax, %edx # console_printk,, tmp111
movb debug_mutex_lock, %al #, D.9479
movl %edx, console_printk # tmp111, console_printk
testb %al, %al # D.9479
jg .L80 #,
movl $debug_mutex_lock, %eax #,
call _spin_unlock #
.L80:
pushl $__func__.9044 #
pushl $198 #
pushl $.LC0 #
pushl $.LC1 #
call printk #
call dump_stack #
addl $16, %esp #,
.L78:
movl 4(%edi), %eax # <variable>.thread_info, temp.150
cmpl %eax, 20(%esi) # temp.150, <variable>.owner
je .L96 #,
cmpl $0, debug_mutex_on #, debug_mutex_on
je .L96 #,
movl console_printk, %eax # console_printk, console_printk
movl $15, %edx #, tmp114
movl $0, debug_mutex_on #, debug_mutex_on
testl %eax, %eax # console_printk
cmove %eax, %edx # console_printk,, tmp114
movb debug_mutex_lock, %al #, D.9484
movl %edx, console_printk # tmp114, console_printk
testb %al, %al # D.9484
jg .L91 #,
movl $debug_mutex_lock, %eax #,
call _spin_unlock #
.L91:
pushl $__func__.9044 #
pushl $199 #
pushl $.LC0 #
pushl $.LC1 #
call printk #
call dump_stack #
addl $16, %esp #,
.L96:
leal -12(%ebp), %esp #,
popl %ebx #
popl %esi #
popl %edi #
popl %ebp #
ret
.size __mutex_lock_slowpath, .-__mutex_lock_slowpath
.globl mutex_lock
.type mutex_lock, @function
mutex_lock:
pushl %ebp #
movl %esp, %ebp #,
pushl %ebx #
movl %eax, %ebx # lock, lock
pushl $97 #
pushl $.LC0 #
call __might_sleep #
movl 4(%ebp), %edx #, tmp60
movl %ebx, %eax # lock, lock
call __mutex_lock_slowpath #
movl -4(%ebp), %ebx #,
popl %eax #
popl %edx #
leave
ret
.size mutex_lock, .-mutex_lock
.ident "GCC: (GNU) 4.0.2 20051125 (Red Hat 4.0.2-8)"
.section .note.GNU-stack,"",@progbits