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sparc64: refactor code in init_64.c 

The sparc64 allmodconfig build broke due to enabling of the
branch_tracer that does some very clever things with
all if conditions. This caused my gcc 3.4.5 to be so confused that
it emitted two warnings:

arch/sparc/mm/init_64.c: In function `update_mmu_cache':
arch/sparc/mm/init_64.c:271: warning: 'pg_flags' might be used uninitialized in this function
arch/sparc/mm/init_64.c:272: warning: 'page' might be used uninitialized in this function

And with -Werror this broke the build.

Refactor code so it:
1) becomes more readable
2) no longer emit a warning with the branch_tracer enabled

The refactoring uses a small helper function (flush_dcache()).

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Sam Ravnborg 2009-01-06 12:51:26 -08:00 committed by David S. Miller
parent 2eac5a0d3a
commit ff9aefbf4d
1 changed files with 21 additions and 11 deletions
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32
arch/sparc/mm/init_64.c
View File

@ -258,21 +258,16 @@ static inline void tsb_insert(struct tsb *ent, unsigned long tag, unsigned long
unsigned long _PAGE_ALL_SZ_BITS __read_mostly; unsigned long _PAGE_ALL_SZ_BITS __read_mostly;
unsigned long _PAGE_SZBITS __read_mostly; unsigned long _PAGE_SZBITS __read_mostly;
void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t pte) static void flush_dcache(unsigned long pfn)
{ {
struct mm_struct *mm; struct page *page;
struct tsb *tsb;
unsigned long tag, flags;
unsigned long tsb_index, tsb_hash_shift;
if (tlb_type != hypervisor) { page = pfn_to_page(pfn);
unsigned long pfn = pte_pfn(pte); if (page && page_mapping(page)) {
unsigned long pg_flags; unsigned long pg_flags;
struct page *page;
if (pfn_valid(pfn) && pg_flags = page->flags;
(page = pfn_to_page(pfn), page_mapping(page)) && if (pg_flags & (1UL << PG_dcache_dirty)) {
((pg_flags = page->flags) & (1UL << PG_dcache_dirty))) {
int cpu = ((pg_flags >> PG_dcache_cpu_shift) & int cpu = ((pg_flags >> PG_dcache_cpu_shift) &
PG_dcache_cpu_mask); PG_dcache_cpu_mask);
int this_cpu = get_cpu(); int this_cpu = get_cpu();
@ -290,6 +285,21 @@ void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t p
put_cpu(); put_cpu();
} }
} }
}
void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t pte)
{
struct mm_struct *mm;
struct tsb *tsb;
unsigned long tag, flags;
unsigned long tsb_index, tsb_hash_shift;
if (tlb_type != hypervisor) {
unsigned long pfn = pte_pfn(pte);
if (pfn_valid(pfn))
flush_dcache(pfn);
}
mm = vma->vm_mm; mm = vma->vm_mm;