This is a note to let you know that I've just added the patch titled
sparc64: Implement __get_user_pages_fast().
to the 3.17-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
sparc64-implement-__get_user_pages_fast.patch
and it can be found in the queue-3.17 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Tue Oct 28 11:21:07 CST 2014
From: "David S. Miller" <davem@xxxxxxxxxxxxx>
Date: Fri, 24 Oct 2014 09:59:02 -0700
Subject: sparc64: Implement __get_user_pages_fast().
From: "David S. Miller" <davem@xxxxxxxxxxxxx>
[ Upstream commit 06090e8ed89ea2113a236befb41f71d51f100e60 ]
It is not sufficient to only implement get_user_pages_fast(), you
must also implement the atomic version __get_user_pages_fast()
otherwise you end up using the weak symbol fallback implementation
which simply returns zero.
This is dangerous, because it causes the futex code to loop forever
if transparent hugepages are supported (see get_futex_key()).
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/sparc/mm/gup.c | 30 ++++++++++++++++++++++++++++++
1 file changed, 30 insertions(+)
--- a/arch/sparc/mm/gup.c
+++ b/arch/sparc/mm/gup.c
@@ -160,6 +160,36 @@ static int gup_pud_range(pgd_t pgd, unsi
return 1;
}
+int __get_user_pages_fast(unsigned long start, int nr_pages, int write,
+ struct page **pages)
+{
+ struct mm_struct *mm = current->mm;
+ unsigned long addr, len, end;
+ unsigned long next, flags;
+ pgd_t *pgdp;
+ int nr = 0;
+
+ start &= PAGE_MASK;
+ addr = start;
+ len = (unsigned long) nr_pages << PAGE_SHIFT;
+ end = start + len;
+
+ local_irq_save(flags);
+ pgdp = pgd_offset(mm, addr);
+ do {
+ pgd_t pgd = *pgdp;
+
+ next = pgd_addr_end(addr, end);
+ if (pgd_none(pgd))
+ break;
+ if (!gup_pud_range(pgd, addr, next, write, pages, &nr))
+ break;
+ } while (pgdp++, addr = next, addr != end);
+ local_irq_restore(flags);
+
+ return nr;
+}
+
int get_user_pages_fast(unsigned long start, int nr_pages, int write,
struct page **pages)
{
Patches currently in stable-queue which might be from davem@xxxxxxxxxxxxx are
queue-3.17/sparc64-adjust-vmalloc-region-size-based-upon-available-virtual-address-bits.patch
queue-3.17/sparc64-fix-fpu-register-corruption-with-aes-crypto-offload.patch
queue-3.17/sparc64-move-request_irq-from-ldc_bind-to-ldc_alloc.patch
queue-3.17/sparc32-dma_alloc_coherent-must-honour-gfp-flags.patch
queue-3.17/sparc64-kill-unnecessary-tables-and-increase-max_banks.patch
queue-3.17/sparc-let-memset-return-the-address-argument.patch
queue-3.17/sparc64-use-kernel-page-tables-for-vmemmap.patch
queue-3.17/sparc64-sparse-irq.patch
queue-3.17/sparc64-fix-physical-memory-management-regressions-with-large-max_phys_bits.patch
queue-3.17/sparc64-fix-lockdep-warnings-on-reboot-on-ultra-5.patch
queue-3.17/sparc64-switch-to-4-level-page-tables.patch
queue-3.17/sparc64-sun4v-tlb-error-power-off-events.patch
queue-3.17/sparc64-increase-size-of-boot-string-to-1024-bytes.patch
queue-3.17/sparc64-find_node-adjustment.patch
queue-3.17/sparc64-fix-reversed-start-end-in-flush_tlb_kernel_range.patch
queue-3.17/sparc64-increase-max_phys_address_bits-to-53.patch
queue-3.17/sparc64-define-va-hole-at-run-time-rather-than-at-compile-time.patch
queue-3.17/sparc64-fix-register-corruption-in-top-most-kernel-stack-frame-during-boot.patch
queue-3.17/sparc64-support-m6-and-m7-for-building-cpu-distribution-map.patch
queue-3.17/sparc64-cpu-hardware-caps-support-for-sparc-m6-and-m7.patch
queue-3.17/sparc64-do-not-define-thread-fpregs-save-area-as-zero-length-array.patch
queue-3.17/sparc64-t5-pmu.patch
queue-3.17/sparc64-adjust-ktsb-assembler-to-support-larger-physical-addresses.patch
queue-3.17/sparc64-implement-__get_user_pages_fast.patch
queue-3.17/sparc64-fix-corrupted-thread-fault-code.patch
queue-3.17/sparc64-fix-hibernation-code-refrence-to-page_offset.patch
queue-3.17/sparc64-correctly-recognise-m6-and-m7-cpu-type.patch
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