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cpumask: convert kernel/compat.c

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Impact: Reduce stack usage, use new cpumask API.

Straightforward conversion; cpumasks' size is given by cpumask_size() (now
a variable rather than fixed) and on-stack cpu masks use cpumask_var_t.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2009-01-01 10:12:24 +10:30
parent 3e59794538
commit a45185d2d7
1 changed files with 31 additions and 20 deletions
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51
kernel/compat.c
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@ -454,16 +454,16 @@ asmlinkage long compat_sys_waitid(int which, compat_pid_t pid,
} }
static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr, static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr,
unsigned len, cpumask_t *new_mask) unsigned len, struct cpumask *new_mask)
{ {
unsigned long *k; unsigned long *k;
if (len < sizeof(cpumask_t)) if (len < cpumask_size())
memset(new_mask, 0, sizeof(cpumask_t)); memset(new_mask, 0, cpumask_size());
else if (len > sizeof(cpumask_t)) else if (len > cpumask_size())
len = sizeof(cpumask_t); len = cpumask_size();
k = cpus_addr(*new_mask); k = cpumask_bits(new_mask);
return compat_get_bitmap(k, user_mask_ptr, len * 8); return compat_get_bitmap(k, user_mask_ptr, len * 8);
} }
@ -471,40 +471,51 @@ asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
unsigned int len, unsigned int len,
compat_ulong_t __user *user_mask_ptr) compat_ulong_t __user *user_mask_ptr)
{ {
cpumask_t new_mask; cpumask_var_t new_mask;
int retval; int retval;
retval = compat_get_user_cpu_mask(user_mask_ptr, len, &new_mask); if (!alloc_cpumask_var(&new_mask, GFP_KERNEL))
if (retval) return -ENOMEM;
return retval;
return sched_setaffinity(pid, &new_mask); retval = compat_get_user_cpu_mask(user_mask_ptr, len, new_mask);
if (retval)
goto out;
retval = sched_setaffinity(pid, new_mask);
out:
free_cpumask_var(new_mask);
return retval;
} }
asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len, asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len,
compat_ulong_t __user *user_mask_ptr) compat_ulong_t __user *user_mask_ptr)
{ {
int ret; int ret;
cpumask_t mask; cpumask_var_t mask;
unsigned long *k; unsigned long *k;
unsigned int min_length = sizeof(cpumask_t); unsigned int min_length = cpumask_size();
if (NR_CPUS <= BITS_PER_COMPAT_LONG) if (nr_cpu_ids <= BITS_PER_COMPAT_LONG)
min_length = sizeof(compat_ulong_t); min_length = sizeof(compat_ulong_t);
if (len < min_length) if (len < min_length)
return -EINVAL; return -EINVAL;
ret = sched_getaffinity(pid, &mask); if (!alloc_cpumask_var(&mask, GFP_KERNEL))
return -ENOMEM;
ret = sched_getaffinity(pid, mask);
if (ret < 0) if (ret < 0)
return ret; goto out;
k = cpus_addr(mask); k = cpumask_bits(mask);
ret = compat_put_bitmap(user_mask_ptr, k, min_length * 8); ret = compat_put_bitmap(user_mask_ptr, k, min_length * 8);
if (ret) if (ret == 0)
return ret; ret = min_length;
return min_length; out:
free_cpumask_var(mask);
return ret;
} }
int get_compat_itimerspec(struct itimerspec *dst, int get_compat_itimerspec(struct itimerspec *dst,