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do_sigaltstack: small cleanups 

The previous commit ("do_sigaltstack: avoid copying 'stack_t' as a
structure to user space") fixed a real bug.  This one just cleans up the
copy from user space to that gcc can generate better code for it (and so
that it looks the same as the later copy back to user space).

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Linus Torvalds 2009-08-01 11:18:56 -07:00
parent 0083fc2c50
commit 0dd8486b5c
1 changed files with 6 additions and 4 deletions
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10
kernel/signal.c
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@ -2464,10 +2464,12 @@ do_sigaltstack (const stack_t __user *uss, stack_t __user *uoss, unsigned long s
int ss_flags;
error = -EFAULT;
if (!access_ok(VERIFY_READ, uss, sizeof(*uss))
|| __get_user(ss_sp, &uss->ss_sp)
|| __get_user(ss_flags, &uss->ss_flags)
|| __get_user(ss_size, &uss->ss_size))
if (!access_ok(VERIFY_READ, uss, sizeof(*uss)))
goto out;
error = __get_user(ss_sp, &uss->ss_sp) |
__get_user(ss_flags, &uss->ss_flags) |
__get_user(ss_size, &uss->ss_size);
if (error)
goto out;
error = -EPERM;