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Full Discussion: Linux Kernel code "current" macro
Top Forums Programming Linux Kernel code "current" macro Post 302534952 by kumaran_5555 on Wednesday 29th of June 2011 08:23:14 AM
Old 06-29-2011
Linux Kernel code "current" macro
I was going through the Linux code, i stuck with few inline assembly language code,

I have tried online but in vain. Any help is much appreciated. Thanks.

Code:
/* how to get the thread information struct from C */
static inline struct thread_info *current_thread_info(void)
{
    struct thread_info *ti;
    __asm__("andl %%esp,%0; ":"=r" (ti) : "0" (~(THREAD_SIZE - 1)));
    return ti;
}

I have understood the point that it is being taken from kernel mode stack of size 8192 bytes. But couldn't understand the assembly langauage instruction.
Last edited by kumaran_5555; 06-29-2011 at 09:44 AM..
 

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LEARN ABOUT DEBIAN

hwloc_cpuset_from_linux_libnuma_nodemask

Helpers for manipulating Linux libnuma nodemask_t(3)	     Hardware Locality (hwloc)	      Helpers for manipulating Linux libnuma nodemask_t(3)

NAME

       Helpers for manipulating Linux libnuma nodemask_t -

   Functions
       static inline int hwloc_cpuset_to_linux_libnuma_nodemask (hwloc_topology_t topology, hwloc_const_cpuset_t cpuset, nodemask_t *nodemask)
       static inline int hwloc_nodeset_to_linux_libnuma_nodemask (hwloc_topology_t topology, hwloc_const_nodeset_t nodeset, nodemask_t *nodemask)
       static inline int hwloc_cpuset_from_linux_libnuma_nodemask (hwloc_topology_t topology, hwloc_cpuset_t cpuset, const nodemask_t *nodemask)
       static inline int hwloc_nodeset_from_linux_libnuma_nodemask (hwloc_topology_t topology, hwloc_nodeset_t nodeset, const nodemask_t
	   *nodemask)

Detailed Description
       Note:
	   The Linux libnuma nodemask_t interface is deprecated and its implementation is at least incorrect with respect to sparse NUMA node ids.
	   It is strongly advised to use struct bitmask instead of nodemask_t, or even to use hwloc directly.

Function Documentation
   static inline int hwloc_cpuset_from_linux_libnuma_nodemask (hwloc_topology_ttopology, hwloc_cpuset_tcpuset, const nodemask_t *nodemask)
       [static]
       Convert libnuma nodemask nodemask into hwloc CPU set cpuset. This function may be used before calling some old libnuma functions that use a
       nodemask_t as an output parameter.

   static inline int hwloc_cpuset_to_linux_libnuma_nodemask (hwloc_topology_ttopology, hwloc_const_cpuset_tcpuset, nodemask_t *nodemask) [static]
       Convert hwloc CPU set cpuset into libnuma nodemask nodemask. This function may be used before calling some old libnuma functions that use a
       nodemask_t as an input parameter.

   static inline int hwloc_nodeset_from_linux_libnuma_nodemask (hwloc_topology_ttopology, hwloc_nodeset_tnodeset, const nodemask_t *nodemask)
       [static]
       Convert libnuma nodemask nodemask into hwloc NUMA node set nodeset. This function may be used before calling some old libnuma functions
       that use a nodemask_t as an output parameter.

   static inline int hwloc_nodeset_to_linux_libnuma_nodemask (hwloc_topology_ttopology, hwloc_const_nodeset_tnodeset, nodemask_t *nodemask)
       [static]
       Convert hwloc NUMA node set nodeset into libnuma nodemask nodemask. This function may be used before calling some old libnuma functions
       that use a nodemask_t as an input parameter.

Author
       Generated automatically by Doxygen for Hardware Locality (hwloc) from the source code.

Version 1.4.1							  Mon Feb 27 2012	      Helpers for manipulating Linux libnuma nodemask_t(3)
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