Commit 89240ba0 authored by Stefani Seibold's avatar Stefani Seibold Committed by Ingo Molnar

x86, fs: Fix x86 procfs stack information for threads on 64-bit

This patch fixes two issues in the procfs stack information on
x86-64 linux.

The 32 bit loader compat_do_execve did not store stack
start. (this was figured out by Alexey Dobriyan).

The stack information on a x64_64 kernel always shows 0 kbyte
stack usage, because of a missing implementation of the KSTK_ESP
macro which always returned -1.

The new implementation now returns the right value.
Signed-off-by: default avatarStefani Seibold <stefani@seibold.net>
Cc: Americo Wang <xiyou.wangcong@gmail.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Andrew Morton <akpm@linux-foundation.org>
LKML-Reference: <1257240160.4889.24.camel@wall-e>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 1d87cff4
...@@ -1000,7 +1000,7 @@ extern unsigned long thread_saved_pc(struct task_struct *tsk); ...@@ -1000,7 +1000,7 @@ extern unsigned long thread_saved_pc(struct task_struct *tsk);
#define thread_saved_pc(t) (*(unsigned long *)((t)->thread.sp - 8)) #define thread_saved_pc(t) (*(unsigned long *)((t)->thread.sp - 8))
#define task_pt_regs(tsk) ((struct pt_regs *)(tsk)->thread.sp0 - 1) #define task_pt_regs(tsk) ((struct pt_regs *)(tsk)->thread.sp0 - 1)
#define KSTK_ESP(tsk) -1 /* sorry. doesn't work for syscall. */ extern unsigned long KSTK_ESP(struct task_struct *task);
#endif /* CONFIG_X86_64 */ #endif /* CONFIG_X86_64 */
extern void start_thread(struct pt_regs *regs, unsigned long new_ip, extern void start_thread(struct pt_regs *regs, unsigned long new_ip,
......
...@@ -664,3 +664,8 @@ long sys_arch_prctl(int code, unsigned long addr) ...@@ -664,3 +664,8 @@ long sys_arch_prctl(int code, unsigned long addr)
return do_arch_prctl(current, code, addr); return do_arch_prctl(current, code, addr);
} }
unsigned long KSTK_ESP(struct task_struct *task)
{
return (test_tsk_thread_flag(task, TIF_IA32)) ?
(task_pt_regs(task)->sp) : ((task)->thread.usersp);
}
...@@ -1532,6 +1532,8 @@ int compat_do_execve(char * filename, ...@@ -1532,6 +1532,8 @@ int compat_do_execve(char * filename,
if (retval < 0) if (retval < 0)
goto out; goto out;
current->stack_start = current->mm->start_stack;
/* execve succeeded */ /* execve succeeded */
current->fs->in_exec = 0; current->fs->in_exec = 0;
current->in_execve = 0; current->in_execve = 0;
......
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