From ff9aefbf4dab2c631a90f0319dfb316c6769d5a4 Mon Sep 17 00:00:00 2001 From: Sam Ravnborg Date: Tue, 6 Jan 2009 12:51:26 -0800 Subject: [PATCH] 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 Signed-off-by: David S. Miller --- arch/sparc/mm/init_64.c | 32 +++++++++++++++++++++----------- 1 file changed, 21 insertions(+), 11 deletions(-) diff --git a/arch/sparc/mm/init_64.c b/arch/sparc/mm/init_64.c index 6ea73da29312..6ffc7e911d50 100644 --- a/arch/sparc/mm/init_64.c +++ b/arch/sparc/mm/init_64.c @@ -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_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 tsb *tsb; - unsigned long tag, flags; - unsigned long tsb_index, tsb_hash_shift; + struct page *page; - if (tlb_type != hypervisor) { - unsigned long pfn = pte_pfn(pte); + page = pfn_to_page(pfn); + if (page && page_mapping(page)) { unsigned long pg_flags; - struct page *page; - if (pfn_valid(pfn) && - (page = pfn_to_page(pfn), page_mapping(page)) && - ((pg_flags = page->flags) & (1UL << PG_dcache_dirty))) { + pg_flags = page->flags; + if (pg_flags & (1UL << PG_dcache_dirty)) { int cpu = ((pg_flags >> PG_dcache_cpu_shift) & PG_dcache_cpu_mask); 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(); } } +} + +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; -- 2.20.1