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Date: Fri, 26 Apr 2019 12:14:39 +0530
From: "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>
To: Christophe Leroy <christophe.leroy@....fr>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Paul Mackerras <paulus@...ba.org>,
Michael Ellerman <mpe@...erman.id.au>
Cc: linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 11/11] powerpc/mm: drop slice DEBUG
Christophe Leroy <christophe.leroy@....fr> writes:
> slice is now an improved functionnality. Drop the DEBUG stuff.
>
I would like to keep that. I helped a lot when moving address ranges and
it should not have any runtime impact.
> Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
> ---
> arch/powerpc/mm/slice.c | 62 ++++---------------------------------------------
> 1 file changed, 4 insertions(+), 58 deletions(-)
>
> diff --git a/arch/powerpc/mm/slice.c b/arch/powerpc/mm/slice.c
> index 97fbf7b54422..a9d803738b65 100644
> --- a/arch/powerpc/mm/slice.c
> +++ b/arch/powerpc/mm/slice.c
> @@ -41,28 +41,6 @@
>
> static DEFINE_SPINLOCK(slice_convert_lock);
>
> -#ifdef DEBUG
> -int _slice_debug = 1;
> -
> -static void slice_print_mask(const char *label, const struct slice_mask *mask)
> -{
> - if (!_slice_debug)
> - return;
> - pr_devel("%s low_slice: %*pbl\n", label,
> - (int)SLICE_NUM_LOW, &mask->low_slices);
> - pr_devel("%s high_slice: %*pbl\n", label,
> - (int)SLICE_NUM_HIGH, mask->high_slices);
> -}
> -
> -#define slice_dbg(fmt...) do { if (_slice_debug) pr_devel(fmt); } while (0)
> -
> -#else
> -
> -static void slice_print_mask(const char *label, const struct slice_mask *mask) {}
> -#define slice_dbg(fmt...)
> -
> -#endif
> -
> static inline bool slice_addr_is_low(unsigned long addr)
> {
> u64 tmp = (u64)addr;
> @@ -207,9 +185,6 @@ static void slice_convert(struct mm_struct *mm,
> unsigned long i, flags;
> int old_psize;
>
> - slice_dbg("slice_convert(mm=%p, psize=%d)\n", mm, psize);
> - slice_print_mask(" mask", mask);
> -
> psize_mask = slice_mask_for_size(&mm->context, psize);
>
> /* We need to use a spinlock here to protect against
> @@ -255,10 +230,6 @@ static void slice_convert(struct mm_struct *mm,
> (((unsigned long)psize) << (mask_index * 4));
> }
>
> - slice_dbg(" lsps=%lx, hsps=%lx\n",
> - (unsigned long)mm_ctx_low_slices(&mm->context),
> - (unsigned long)mm_ctx_high_slices(&mm->context));
> -
> spin_unlock_irqrestore(&slice_convert_lock, flags);
>
> copro_flush_all_slbs(mm);
> @@ -485,14 +456,9 @@ unsigned long slice_get_unmapped_area(unsigned long addr, unsigned long len,
> BUG_ON(mm_ctx_slb_addr_limit(&mm->context) == 0);
> VM_BUG_ON(radix_enabled());
>
> - slice_dbg("slice_get_unmapped_area(mm=%p, psize=%d...\n", mm, psize);
> - slice_dbg(" addr=%lx, len=%lx, flags=%lx, topdown=%d\n",
> - addr, len, flags, topdown);
> -
> /* If hint, make sure it matches our alignment restrictions */
> if (!fixed && addr) {
> addr = _ALIGN_UP(addr, page_size);
> - slice_dbg(" aligned addr=%lx\n", addr);
> /* Ignore hint if it's too large or overlaps a VMA */
> if (addr > high_limit - len || addr < mmap_min_addr ||
> !slice_area_is_free(mm, addr, len))
> @@ -538,17 +504,12 @@ unsigned long slice_get_unmapped_area(unsigned long addr, unsigned long len,
> slice_copy_mask(&good_mask, maskp);
> }
>
> - slice_print_mask(" good_mask", &good_mask);
> - if (compat_maskp)
> - slice_print_mask(" compat_mask", compat_maskp);
> -
> /* First check hint if it's valid or if we have MAP_FIXED */
> if (addr != 0 || fixed) {
> /* Check if we fit in the good mask. If we do, we just return,
> * nothing else to do
> */
> if (slice_check_range_fits(mm, &good_mask, addr, len)) {
> - slice_dbg(" fits good !\n");
> newaddr = addr;
> goto return_addr;
> }
> @@ -558,13 +519,10 @@ unsigned long slice_get_unmapped_area(unsigned long addr, unsigned long len,
> */
> newaddr = slice_find_area(mm, len, &good_mask,
> psize, topdown, high_limit);
> - if (newaddr != -ENOMEM) {
> - /* Found within the good mask, we don't have to setup,
> - * we thus return directly
> - */
> - slice_dbg(" found area at 0x%lx\n", newaddr);
> +
> + /* Found within good mask, don't have to setup, thus return directly */
> + if (newaddr != -ENOMEM)
> goto return_addr;
> - }
> }
> /*
> * We don't fit in the good mask, check what other slices are
> @@ -572,11 +530,9 @@ unsigned long slice_get_unmapped_area(unsigned long addr, unsigned long len,
> */
> slice_mask_for_free(mm, &potential_mask, high_limit);
> slice_or_mask(&potential_mask, &potential_mask, &good_mask);
> - slice_print_mask(" potential", &potential_mask);
>
> if (addr != 0 || fixed) {
> if (slice_check_range_fits(mm, &potential_mask, addr, len)) {
> - slice_dbg(" fits potential !\n");
> newaddr = addr;
> goto convert;
> }
> @@ -586,18 +542,14 @@ unsigned long slice_get_unmapped_area(unsigned long addr, unsigned long len,
> if (fixed)
> return -EBUSY;
>
> - slice_dbg(" search...\n");
> -
> /* If we had a hint that didn't work out, see if we can fit
> * anywhere in the good area.
> */
> if (addr) {
> newaddr = slice_find_area(mm, len, &good_mask,
> psize, topdown, high_limit);
> - if (newaddr != -ENOMEM) {
> - slice_dbg(" found area at 0x%lx\n", newaddr);
> + if (newaddr != -ENOMEM)
> goto return_addr;
> - }
> }
>
> /* Now let's see if we can find something in the existing slices
> @@ -618,8 +570,6 @@ unsigned long slice_get_unmapped_area(unsigned long addr, unsigned long len,
> return -ENOMEM;
>
> slice_range_to_mask(newaddr, len, &potential_mask);
> - slice_dbg(" found potential area at 0x%lx\n", newaddr);
> - slice_print_mask(" mask", &potential_mask);
>
> convert:
> /*
> @@ -697,8 +647,6 @@ void slice_init_new_context_exec(struct mm_struct *mm)
> struct slice_mask *mask;
> unsigned int psize = mmu_virtual_psize;
>
> - slice_dbg("slice_init_new_context_exec(mm=%p)\n", mm);
> -
> /*
> * In the case of exec, use the default limit. In the
> * case of fork it is just inherited from the mm being
> @@ -730,8 +678,6 @@ void slice_setup_new_exec(void)
> {
> struct mm_struct *mm = current->mm;
>
> - slice_dbg("slice_setup_new_exec(mm=%p)\n", mm);
> -
> if (!is_32bit_task())
> return;
>
> --
> 2.13.3
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