Messages in this thread Patch in this message | | | From | Jiri Slaby <> | Subject | [PATCH] SPARC: use helpers for rlimits | Date | Wed, 6 Jan 2010 16:24:33 +0100 |
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Make sure compiler won't do weird things with limits. E.g. fetching them twice may return 2 different values after writable limits are implemented.
I.e. either use rlimit helpers added in 3e10e716abf3c71bdb5d86b8f507f9e72236c9cd or ACCESS_ONCE if not applicable.
Signed-off-by: Jiri Slaby <jslaby@suse.cz> Cc: "David S. Miller" <davem@davemloft.net> Cc: sparclinux@vger.kernel.org --- arch/sparc/kernel/sys_sparc_64.c | 6 +++--- 1 files changed, 3 insertions(+), 3 deletions(-)
diff --git a/arch/sparc/kernel/sys_sparc_64.c b/arch/sparc/kernel/sys_sparc_64.c index cfa0e19..d77f543 100644 --- a/arch/sparc/kernel/sys_sparc_64.c +++ b/arch/sparc/kernel/sys_sparc_64.c @@ -365,6 +365,7 @@ EXPORT_SYMBOL(get_fb_unmapped_area); void arch_pick_mmap_layout(struct mm_struct *mm) { unsigned long random_factor = 0UL; + unsigned long gap; if (current->flags & PF_RANDOMIZE) { random_factor = get_random_int(); @@ -379,9 +380,10 @@ void arch_pick_mmap_layout(struct mm_struct *mm) * Fall back to the standard layout if the personality * bit is set, or if the expected stack growth is unlimited: */ + gap = rlimit(RLIMIT_STACK); if (!test_thread_flag(TIF_32BIT) || (current->personality & ADDR_COMPAT_LAYOUT) || - current->signal->rlim[RLIMIT_STACK].rlim_cur == RLIM_INFINITY || + gap == RLIM_INFINITY || sysctl_legacy_va_layout) { mm->mmap_base = TASK_UNMAPPED_BASE + random_factor; mm->get_unmapped_area = arch_get_unmapped_area; @@ -389,9 +391,7 @@ void arch_pick_mmap_layout(struct mm_struct *mm) } else { /* We know it's 32-bit */ unsigned long task_size = STACK_TOP32; - unsigned long gap; - gap = current->signal->rlim[RLIMIT_STACK].rlim_cur; if (gap < 128 * 1024 * 1024) gap = 128 * 1024 * 1024; if (gap > (task_size / 6 * 5)) -- 1.6.5.7
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