~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/arch/alpha/lib/dec_and_lock.c

Version: ~ [ linux-5.3 ] ~ [ linux-5.2.15 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.73 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.144 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.193 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.193 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.73 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /*
  2  * arch/alpha/lib/dec_and_lock.c
  3  *
  4  * ll/sc version of atomic_dec_and_lock()
  5  * 
  6  */
  7 
  8 #include <linux/spinlock.h>
  9 #include <linux/atomic.h>
 10 #include <linux/export.h>
 11 
 12   asm (".text                                   \n\
 13         .global _atomic_dec_and_lock            \n\
 14         .ent _atomic_dec_and_lock               \n\
 15         .align  4                               \n\
 16 _atomic_dec_and_lock:                           \n\
 17         .prologue 0                             \n\
 18 1:      ldl_l   $1, 0($16)                      \n\
 19         subl    $1, 1, $1                       \n\
 20         beq     $1, 2f                          \n\
 21         stl_c   $1, 0($16)                      \n\
 22         beq     $1, 4f                          \n\
 23         mb                                      \n\
 24         clr     $0                              \n\
 25         ret                                     \n\
 26 2:      br      $29, 3f                         \n\
 27 3:      ldgp    $29, 0($29)                     \n\
 28         br      $atomic_dec_and_lock_1..ng      \n\
 29         .subsection 2                           \n\
 30 4:      br      1b                              \n\
 31         .previous                               \n\
 32         .end _atomic_dec_and_lock");
 33 
 34 static int __used atomic_dec_and_lock_1(atomic_t *atomic, spinlock_t *lock)
 35 {
 36         /* Slow path */
 37         spin_lock(lock);
 38         if (atomic_dec_and_test(atomic))
 39                 return 1;
 40         spin_unlock(lock);
 41         return 0;
 42 }
 43 EXPORT_SYMBOL(_atomic_dec_and_lock);
 44 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp