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riscv/vdso: make arch_setup_additional_pages wait for mmap_sem for write killable

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[ Upstream commit 8bb0ab3ae7a4dbe6cf32deb830cf2bdbf5736867 ]

riscv architectures relying on mmap_sem for write in their
arch_setup_additional_pages. If the waiting task gets killed by the oom
killer it would block oom_reaper from asynchronous address space reclaim
and reduce the chances of timely OOM resolving.  Wait for the lock in
the killable mode and return with EINTR if the task got killed while
waiting.

Signed-off-by: Tong Tiangen <tongtiangen@huawei.com>
Reviewed-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Fixes: 76d2a0493a ("RISC-V: Init and Halt Code")
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Tong Tiangen 2021-09-01 02:46:21 +00:00 committed by Greg Kroah-Hartman
parent de834e12b9
commit 2c152d9da8
1 changed files with 3 additions and 1 deletions
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arch/riscv/kernel/vdso.c
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@ -65,7 +65,9 @@ int arch_setup_additional_pages(struct linux_binprm *bprm,
vdso_len = (vdso_pages + 1) << PAGE_SHIFT;
mmap_write_lock(mm);
if (mmap_write_lock_killable(mm))
return -EINTR;
vdso_base = get_unmapped_area(NULL, 0, vdso_len, 0, 0);
if (IS_ERR_VALUE(vdso_base)) {
ret = vdso_base;