[PATCH] alpha: Fix getxpid on alpha so it works for threads
While looking in the code I discovered that alpha has fallen behind because it doesn't use sys_getppid. The problem is that it doesn't follow the task struct to the task_group_leader. Acked-by: Richard Henderson <rth@twiddle.net> Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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@ -28,6 +28,7 @@ void foo(void)
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DEFINE(TASK_GID, offsetof(struct task_struct, gid));
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DEFINE(TASK_EGID, offsetof(struct task_struct, egid));
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DEFINE(TASK_REAL_PARENT, offsetof(struct task_struct, real_parent));
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DEFINE(TASK_GROUP_LEADER, offsetof(struct task_struct, group_leader));
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DEFINE(TASK_TGID, offsetof(struct task_struct, tgid));
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BLANK();
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@ -879,17 +879,19 @@ sys_getxpid:
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/* See linux/kernel/timer.c sys_getppid for discussion
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about this loop. */
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ldq $3, TASK_REAL_PARENT($2)
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1: ldl $1, TASK_TGID($3)
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ldq $3, TASK_GROUP_LEADER($2)
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ldq $4, TASK_REAL_PARENT($3)
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ldl $0, TASK_TGID($2)
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1: ldl $1, TASK_TGID($4)
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#ifdef CONFIG_SMP
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mov $3, $4
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mov $4, $5
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mb
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ldq $3, TASK_REAL_PARENT($2)
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cmpeq $3, $4, $4
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beq $4, 1b
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ldq $3, TASK_GROUP_LEADER($2)
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ldq $4, TASK_REAL_PARENT($3)
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cmpeq $4, $5, $5
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beq $5, 1b
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#endif
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stq $1, 80($sp)
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ldl $0, TASK_TGID($2)
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ret
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.end sys_getxpid
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