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author | Al Viro <viro@zeniv.linux.org.uk> | 2009-12-03 19:59:24 -0500 |
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committer | Al Viro <viro@zeniv.linux.org.uk> | 2009-12-11 06:44:58 -0500 |
commit | bb52d6694002b9d632bb355f64daa045c6293a4e (patch) | |
tree | 526b8fb0a6db6ef002d94d8b7bca26b5451d39ec /arch/ia64/kernel | |
parent | 05d72faa6d13c9d857478a5d35c85db9adada685 (diff) | |
download | kernel_samsung_aries-bb52d6694002b9d632bb355f64daa045c6293a4e.zip kernel_samsung_aries-bb52d6694002b9d632bb355f64daa045c6293a4e.tar.gz kernel_samsung_aries-bb52d6694002b9d632bb355f64daa045c6293a4e.tar.bz2 |
Get rid of open-coding in ia64_brk()
The comment in there used to be true, but these days do_brk() does
the arch-specific check that covers what we open-coded here. So we
can use sys_brk() just fine, only need to do force_successful_syscall_return()
after it.
See commit 3a459756810912d2c2bf188cef566af255936b4d - that's when the
checks in do_brk() had been originally added.
Acked-by: Hugh Dickins <hugh.dickins@tiscali.co.uk>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'arch/ia64/kernel')
-rw-r--r-- | arch/ia64/kernel/sys_ia64.c | 46 |
1 files changed, 1 insertions, 45 deletions
diff --git a/arch/ia64/kernel/sys_ia64.c b/arch/ia64/kernel/sys_ia64.c index ae384a2..609d500 100644 --- a/arch/ia64/kernel/sys_ia64.c +++ b/arch/ia64/kernel/sys_ia64.c @@ -100,51 +100,7 @@ sys_getpagesize (void) asmlinkage unsigned long ia64_brk (unsigned long brk) { - unsigned long rlim, retval, newbrk, oldbrk; - struct mm_struct *mm = current->mm; - - /* - * Most of this replicates the code in sys_brk() except for an additional safety - * check and the clearing of r8. However, we can't call sys_brk() because we need - * to acquire the mmap_sem before we can do the test... - */ - down_write(&mm->mmap_sem); - - if (brk < mm->end_code) - goto out; - newbrk = PAGE_ALIGN(brk); - oldbrk = PAGE_ALIGN(mm->brk); - if (oldbrk == newbrk) - goto set_brk; - - /* Always allow shrinking brk. */ - if (brk <= mm->brk) { - if (!do_munmap(mm, newbrk, oldbrk-newbrk)) - goto set_brk; - goto out; - } - - /* Check against unimplemented/unmapped addresses: */ - if ((newbrk - oldbrk) > RGN_MAP_LIMIT || REGION_OFFSET(newbrk) > RGN_MAP_LIMIT) - goto out; - - /* Check against rlimit.. */ - rlim = current->signal->rlim[RLIMIT_DATA].rlim_cur; - if (rlim < RLIM_INFINITY && brk - mm->start_data > rlim) - goto out; - - /* Check against existing mmap mappings. */ - if (find_vma_intersection(mm, oldbrk, newbrk+PAGE_SIZE)) - goto out; - - /* Ok, looks good - let it rip. */ - if (do_brk(oldbrk, newbrk-oldbrk) != oldbrk) - goto out; -set_brk: - mm->brk = brk; -out: - retval = mm->brk; - up_write(&mm->mmap_sem); + unsigned long retval = sys_brk(brk); force_successful_syscall_return(); return retval; } |