Re: [RFC PATCH] mm: remove zap_page_range and change callers to use zap_vma_page_range

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On Fri, 16 Dec 2022 11:20:12 PST (-0800), mike.kravetz@xxxxxxxxxx wrote:
zap_page_range was originally designed to unmap pages within an address
range that could span multiple vmas.  While working on [1], it was
discovered that all callers of zap_page_range pass a range entirely within
a single vma.  In addition, the mmu notification call within zap_page
range does not correctly handle ranges that span multiple vmas as calls
should be vma specific.

Instead of fixing zap_page_range, change all callers to use the new
routine zap_vma_page_range.  zap_vma_page_range is just a wrapper around
zap_page_range_single passing in NULL zap details.  The name is also
more in line with other exported routines that operate within a vma.
We can then remove zap_page_range.

Also, change madvise_dontneed_single_vma to use this new routine.

[1] https://lore.kernel.org/linux-mm/20221114235507.294320-2-mike.kravetz@xxxxxxxxxx/
Suggested-by: Peter Xu <peterx@xxxxxxxxxx>
Signed-off-by: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
---
 arch/arm64/kernel/vdso.c                |  4 ++--
 arch/powerpc/kernel/vdso.c              |  2 +-
 arch/powerpc/platforms/book3s/vas-api.c |  2 +-
 arch/powerpc/platforms/pseries/vas.c    |  2 +-
 arch/riscv/kernel/vdso.c                |  4 ++--
 arch/s390/kernel/vdso.c                 |  2 +-
 arch/s390/mm/gmap.c                     |  2 +-
 arch/x86/entry/vdso/vma.c               |  2 +-
 drivers/android/binder_alloc.c          |  2 +-
 include/linux/mm.h                      |  7 ++++--
 mm/madvise.c                            |  4 ++--
 mm/memory.c                             | 30 -------------------------
 mm/page-writeback.c                     |  2 +-
 net/ipv4/tcp.c                          |  6 ++---
 14 files changed, 22 insertions(+), 49 deletions(-)

[snip]

diff --git a/arch/riscv/kernel/vdso.c b/arch/riscv/kernel/vdso.c
index e410275918ac..a405119da2c0 100644
--- a/arch/riscv/kernel/vdso.c
+++ b/arch/riscv/kernel/vdso.c
@@ -127,10 +127,10 @@ int vdso_join_timens(struct task_struct *task, struct time_namespace *ns)
 		unsigned long size = vma->vm_end - vma->vm_start;

 		if (vma_is_special_mapping(vma, vdso_info.dm))
-			zap_page_range(vma, vma->vm_start, size);
+			zap_vma_page_range(vma, vma->vm_start, size);
 #ifdef CONFIG_COMPAT
 		if (vma_is_special_mapping(vma, compat_vdso_info.dm))
-			zap_page_range(vma, vma->vm_start, size);
+			zap_vma_page_range(vma, vma->vm_start, size);
 #endif
 	}

Acked-by: Palmer Dabbelt <palmer@xxxxxxxxxxxx> # RISC-V

Thanks!




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