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Revert "FROMLIST: scs: add support for stack usage debugging"

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Shadow call stack is now merged upstream for 5.9, so revert the patches
cherry-picked into android-mainline in preparation for pulling the upstream
version instead.

This reverts commit e5438c0fea.

Signed-off-by: Will Deacon <willdeacon@google.com>
Change-Id: I99a5b3555caf473553222657aa53045be3767b0c
This commit is contained in:
Will Deacon
2020-06-09 12:56:33 +01:00
parent d57f1523e2
commit 725878020c
1 changed files with 0 additions and 39 deletions
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39
kernel/scs.c
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@@ -184,44 +184,6 @@ int scs_prepare(struct task_struct *tsk, int node)
return 0;
}
#ifdef CONFIG_DEBUG_STACK_USAGE
static inline unsigned long scs_used(struct task_struct *tsk)
{
unsigned long *p = __scs_base(tsk);
unsigned long *end = scs_magic(p);
unsigned long s = (unsigned long)p;
while (p < end && READ_ONCE_NOCHECK(*p))
p++;
return (unsigned long)p - s;
}
static void scs_check_usage(struct task_struct *tsk)
{
static DEFINE_SPINLOCK(lock);
static unsigned long highest;
unsigned long used = scs_used(tsk);
if (used <= highest)
return;
spin_lock(&lock);
if (used > highest) {
pr_info("%s (%d): highest shadow stack usage: %lu bytes\n",
tsk->comm, task_pid_nr(tsk), used);
highest = used;
}
spin_unlock(&lock);
}
#else
static inline void scs_check_usage(struct task_struct *tsk)
{
}
#endif
bool scs_corrupted(struct task_struct *tsk)
{
unsigned long *magic = scs_magic(__scs_base(tsk));
@@ -238,7 +200,6 @@ void scs_release(struct task_struct *tsk)
return;
WARN_ON(scs_corrupted(tsk));
scs_check_usage(tsk);
scs_account(tsk, -1);
task_set_scs(tsk, NULL);