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!
