From 9a5e7339908d7d718ebc4149b77eee06291bdb95 Mon Sep 17 00:00:00 2001 From: "Eric W. Biederman" Date: Wed, 1 Feb 2006 03:06:12 -0800 Subject: [PATCH] [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 Cc: Ivan Kokshaysky Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/alpha/kernel/asm-offsets.c | 1 + arch/alpha/kernel/entry.S | 16 +++++++++------- 2 files changed, 10 insertions(+), 7 deletions(-) diff --git a/arch/alpha/kernel/asm-offsets.c b/arch/alpha/kernel/asm-offsets.c index 8f2e5c718b..6c56c754a0 100644 --- a/arch/alpha/kernel/asm-offsets.c +++ b/arch/alpha/kernel/asm-offsets.c @@ -28,6 +28,7 @@ void foo(void) DEFINE(TASK_GID, offsetof(struct task_struct, gid)); DEFINE(TASK_EGID, offsetof(struct task_struct, egid)); DEFINE(TASK_REAL_PARENT, offsetof(struct task_struct, real_parent)); + DEFINE(TASK_GROUP_LEADER, offsetof(struct task_struct, group_leader)); DEFINE(TASK_TGID, offsetof(struct task_struct, tgid)); BLANK(); diff --git a/arch/alpha/kernel/entry.S b/arch/alpha/kernel/entry.S index e38671c922..7af15bf7e5 100644 --- a/arch/alpha/kernel/entry.S +++ b/arch/alpha/kernel/entry.S @@ -879,17 +879,19 @@ sys_getxpid: /* See linux/kernel/timer.c sys_getppid for discussion about this loop. */ - ldq $3, TASK_REAL_PARENT($2) -1: ldl $1, TASK_TGID($3) + ldq $3, TASK_GROUP_LEADER($2) + ldq $4, TASK_REAL_PARENT($3) + ldl $0, TASK_TGID($2) +1: ldl $1, TASK_TGID($4) #ifdef CONFIG_SMP - mov $3, $4 + mov $4, $5 mb - ldq $3, TASK_REAL_PARENT($2) - cmpeq $3, $4, $4 - beq $4, 1b + ldq $3, TASK_GROUP_LEADER($2) + ldq $4, TASK_REAL_PARENT($3) + cmpeq $4, $5, $5 + beq $5, 1b #endif stq $1, 80($sp) - ldl $0, TASK_TGID($2) ret .end sys_getxpid -- 2.39.5