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x86/mm: Clean up the TLB flushing code

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The

	if (cpumask_any_but(mm_cpumask(mm), smp_processor_id()) < nr_cpu_ids)

line of code is not exactly the easiest to audit, especially when
it ends up at two different indentation levels.  This eliminates
one of the the copy-n-paste versions.  It also gives us a unified
exit point for each path through this function.  We need this in
a minute for our tracepoint.

Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Link: http://lkml.kernel.org/r/20140731154054.44F1CDDC@viggo.jf.intel.com
Acked-by: Rik van Riel <riel@redhat.com>
Acked-by: Mel Gorman <mgorman@suse.de>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
This commit is contained in:
Dave Hansen 2014-07-31 08:40:54 -07:00 committed by H. Peter Anvin
parent eff50c347f
commit 4995ab9cf5
1 changed files with 11 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

23
arch/x86/mm/tlb.c
View File

@ -161,23 +161,24 @@ void flush_tlb_current_task(void)
void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start,
unsigned long end, unsigned long vmflag)
{
bool need_flush_others_all = true;
unsigned long addr;
unsigned act_entries, tlb_entries = 0;
unsigned long nr_base_pages;
preempt_disable();
if (current->active_mm != mm)
goto flush_all;
goto out;
if (!current->mm) {
leave_mm(smp_processor_id());
goto flush_all;
goto out;
}
if (end == TLB_FLUSH_ALL || tlb_flushall_shift == -1
|| vmflag & VM_HUGETLB) {
local_flush_tlb();
goto flush_all;
goto out;
}
/* In modern CPU, last level tlb used for both data/ins */
@ -196,22 +197,20 @@ void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start,
count_vm_tlb_event(NR_TLB_LOCAL_FLUSH_ALL);
local_flush_tlb();
} else {
need_flush_others_all = false;
/* flush range by one by one 'invlpg' */
for (addr = start; addr < end; addr += PAGE_SIZE) {
count_vm_tlb_event(NR_TLB_LOCAL_FLUSH_ONE);
__flush_tlb_single(addr);
}
if (cpumask_any_but(mm_cpumask(mm),
smp_processor_id()) < nr_cpu_ids)
flush_tlb_others(mm_cpumask(mm), mm, start, end);
preempt_enable();
return;
}
flush_all:
out:
if (need_flush_others_all) {
start = 0UL;
end = TLB_FLUSH_ALL;
}
if (cpumask_any_but(mm_cpumask(mm), smp_processor_id()) < nr_cpu_ids)
flush_tlb_others(mm_cpumask(mm), mm, 0UL, TLB_FLUSH_ALL);
flush_tlb_others(mm_cpumask(mm), mm, start, end);
preempt_enable();
}