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Subject: Re: [PATCH v2 1/4] selftest/vm: verify mmap addr in mremap_test
To:     Sidhartha Kumar <sidhartha.kumar@oracle.com>, shuah@kernel.org,
        akpm@linux-foundation.org
Cc:     linux-mm@kvack.org, linux-kselftest@vger.kernel.org,
        linux-kernel@vger.kernel.org,
        Shuah Khan <skhan@linuxfoundation.org>
References: <20220420215721.4868-1-sidhartha.kumar@oracle.com>
From:   Shuah Khan <skhan@linuxfoundation.org>
Message-ID: <ff3db00d-3e18-8168-9f7d-d91a5591c7f2@linuxfoundation.org>
Date:   Thu, 21 Apr 2022 13:31:32 -0600
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On 4/20/22 3:57 PM, Sidhartha Kumar wrote:
> Avoid calling mmap with requested addresses that are less than the system's
> mmap_min_addr. When run as root, mmap returns EACCES when trying to map
> addresses < mmap_min_addr. This is not one of the error codes for the
> condition to retry the mmap in the test. Rather than arbitrarily retrying
> on EACCES, don't attempt an mmap until addr > vm.mmap_min_addr.
> 
> Add a munmap call after an alignment check as the mappings are retained
> after the retry and can reach the vm.max_map_count sysctl.
> 
> Signed-off-by: Sidhartha Kumar <sidhartha.kumar@oracle.com>
> ---
> v2:
> -change comment for description of get_mmap_min_addr()
> -fix commit message formatting
> 

Thank you.

Reviewed-by: Shuah Khan <skhan@linuxfoundation.org>

Andrew, please let me know if you would like me to take this
through kselftest tree.

thanks,
-- Shuah