From a4d3621503290f73b2ca65a6de58f01296c0b85c Mon Sep 17 00:00:00 2001 From: "Aneesh Kumar K.V" Date: Wed, 22 Mar 2017 09:06:48 +0530 Subject: [PATCH] powerpc/mm/slice: Update the function prototype This avoid copying the slice_mask struct as function return value Signed-off-by: Aneesh Kumar K.V Signed-off-by: Michael Ellerman --- arch/powerpc/mm/slice.c | 62 +++++++++++++++++++---------------------- 1 file changed, 28 insertions(+), 34 deletions(-) diff --git a/arch/powerpc/mm/slice.c b/arch/powerpc/mm/slice.c index 639c7171d174..d1da357583e3 100644 --- a/arch/powerpc/mm/slice.c +++ b/arch/powerpc/mm/slice.c @@ -75,19 +75,18 @@ static void slice_print_mask(const char *label, struct slice_mask mask) {} #endif -static struct slice_mask slice_range_to_mask(unsigned long start, - unsigned long len) +static void slice_range_to_mask(unsigned long start, unsigned long len, + struct slice_mask *ret) { unsigned long end = start + len - 1; - struct slice_mask ret; - ret.low_slices = 0; - bitmap_zero(ret.high_slices, SLICE_NUM_HIGH); + ret->low_slices = 0; + bitmap_zero(ret->high_slices, SLICE_NUM_HIGH); if (start < SLICE_LOW_TOP) { unsigned long mend = min(end, (SLICE_LOW_TOP - 1)); - ret.low_slices = (1u << (GET_LOW_SLICE_INDEX(mend) + 1)) + ret->low_slices = (1u << (GET_LOW_SLICE_INDEX(mend) + 1)) - (1u << GET_LOW_SLICE_INDEX(start)); } @@ -96,9 +95,8 @@ static struct slice_mask slice_range_to_mask(unsigned long start, unsigned long align_end = ALIGN(end, (1UL << SLICE_HIGH_SHIFT)); unsigned long count = GET_HIGH_SLICE_INDEX(align_end) - start_index; - bitmap_set(ret.high_slices, start_index, count); + bitmap_set(ret->high_slices, start_index, count); } - return ret; } static int slice_area_is_free(struct mm_struct *mm, unsigned long addr, @@ -132,53 +130,47 @@ static int slice_high_has_vma(struct mm_struct *mm, unsigned long slice) return !slice_area_is_free(mm, start, end - start); } -static struct slice_mask slice_mask_for_free(struct mm_struct *mm) +static void slice_mask_for_free(struct mm_struct *mm, struct slice_mask *ret) { - struct slice_mask ret; unsigned long i; - ret.low_slices = 0; - bitmap_zero(ret.high_slices, SLICE_NUM_HIGH); + ret->low_slices = 0; + bitmap_zero(ret->high_slices, SLICE_NUM_HIGH); for (i = 0; i < SLICE_NUM_LOW; i++) if (!slice_low_has_vma(mm, i)) - ret.low_slices |= 1u << i; + ret->low_slices |= 1u << i; if (mm->task_size <= SLICE_LOW_TOP) - return ret; + return; for (i = 0; i < SLICE_NUM_HIGH; i++) if (!slice_high_has_vma(mm, i)) - __set_bit(i, ret.high_slices); - - return ret; + __set_bit(i, ret->high_slices); } -static struct slice_mask slice_mask_for_size(struct mm_struct *mm, int psize) +static void slice_mask_for_size(struct mm_struct *mm, int psize, struct slice_mask *ret) { unsigned char *hpsizes; int index, mask_index; - struct slice_mask ret; unsigned long i; u64 lpsizes; - ret.low_slices = 0; - bitmap_zero(ret.high_slices, SLICE_NUM_HIGH); + ret->low_slices = 0; + bitmap_zero(ret->high_slices, SLICE_NUM_HIGH); lpsizes = mm->context.low_slices_psize; for (i = 0; i < SLICE_NUM_LOW; i++) if (((lpsizes >> (i * 4)) & 0xf) == psize) - ret.low_slices |= 1u << i; + ret->low_slices |= 1u << i; hpsizes = mm->context.high_slices_psize; for (i = 0; i < SLICE_NUM_HIGH; i++) { mask_index = i & 0x1; index = i >> 1; if (((hpsizes[index] >> (mask_index * 4)) & 0xf) == psize) - __set_bit(i, ret.high_slices); + __set_bit(i, ret->high_slices); } - - return ret; } static int slice_check_fit(struct slice_mask mask, struct slice_mask available) @@ -460,7 +452,7 @@ unsigned long slice_get_unmapped_area(unsigned long addr, unsigned long len, /* First make up a "good" mask of slices that have the right size * already */ - good_mask = slice_mask_for_size(mm, psize); + slice_mask_for_size(mm, psize, &good_mask); slice_print_mask(" good_mask", good_mask); /* @@ -485,7 +477,7 @@ unsigned long slice_get_unmapped_area(unsigned long addr, unsigned long len, #ifdef CONFIG_PPC_64K_PAGES /* If we support combo pages, we can allow 64k pages in 4k slices */ if (psize == MMU_PAGE_64K) { - compat_mask = slice_mask_for_size(mm, MMU_PAGE_4K); + slice_mask_for_size(mm, MMU_PAGE_4K, &compat_mask); if (fixed) slice_or_mask(&good_mask, &compat_mask); } @@ -494,7 +486,7 @@ unsigned long slice_get_unmapped_area(unsigned long addr, unsigned long len, /* First check hint if it's valid or if we have MAP_FIXED */ if (addr != 0 || fixed) { /* Build a mask for the requested range */ - mask = slice_range_to_mask(addr, len); + slice_range_to_mask(addr, len, &mask); slice_print_mask(" mask", mask); /* Check if we fit in the good mask. If we do, we just return, @@ -521,7 +513,7 @@ unsigned long slice_get_unmapped_area(unsigned long addr, unsigned long len, /* We don't fit in the good mask, check what other slices are * empty and thus can be converted */ - potential_mask = slice_mask_for_free(mm); + slice_mask_for_free(mm, &potential_mask); slice_or_mask(&potential_mask, &good_mask); slice_print_mask(" potential", potential_mask); @@ -564,7 +556,7 @@ unsigned long slice_get_unmapped_area(unsigned long addr, unsigned long len, if (addr == -ENOMEM) return -ENOMEM; - mask = slice_range_to_mask(addr, len); + slice_range_to_mask(addr, len, &mask); slice_dbg(" found potential area at 0x%lx\n", addr); slice_print_mask(" mask", mask); @@ -696,9 +688,11 @@ void slice_set_user_psize(struct mm_struct *mm, unsigned int psize) void slice_set_range_psize(struct mm_struct *mm, unsigned long start, unsigned long len, unsigned int psize) { - struct slice_mask mask = slice_range_to_mask(start, len); + struct slice_mask mask; VM_BUG_ON(radix_enabled()); + + slice_range_to_mask(start, len, &mask); slice_convert(mm, mask, psize); } @@ -731,13 +725,13 @@ int is_hugepage_only_range(struct mm_struct *mm, unsigned long addr, if (radix_enabled()) return 0; - mask = slice_range_to_mask(addr, len); - available = slice_mask_for_size(mm, psize); + slice_range_to_mask(addr, len, &mask); + slice_mask_for_size(mm, psize, &available); #ifdef CONFIG_PPC_64K_PAGES /* We need to account for 4k slices too */ if (psize == MMU_PAGE_64K) { struct slice_mask compat_mask; - compat_mask = slice_mask_for_size(mm, MMU_PAGE_4K); + slice_mask_for_size(mm, MMU_PAGE_4K, &compat_mask); slice_or_mask(&available, &compat_mask); } #endif -- 2.20.1