netdev - Re: [PATCH net] Revert "packet: switch kvzalloc to allocate memory"

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Message-Id: <20180831.230108.1476859470416077993.davem@davemloft.net>
Date:   Fri, 31 Aug 2018 23:01:08 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     edumazet@...gle.com
Cc:     netdev@...r.kernel.org, eric.dumazet@...il.com,
        zhangyu31@...du.com, lirongqing@...du.com
Subject: Re: [PATCH net] Revert "packet: switch kvzalloc to allocate memory"

From: Eric Dumazet <edumazet@...gle.com>
Date: Wed, 29 Aug 2018 11:50:12 -0700

> This reverts commit 71e41286203c017d24f041a7cd71abea7ca7b1e0.
> 
> mmap()/munmap() can not be backed by kmalloced pages :
> 
> We fault in :
> 
>     VM_BUG_ON_PAGE(PageSlab(page), page);
> 
>     unmap_single_vma+0x8a/0x110
>     unmap_vmas+0x4b/0x90
>     unmap_region+0xc9/0x140
>     do_munmap+0x274/0x360
>     vm_munmap+0x81/0xc0
>     SyS_munmap+0x2b/0x40
>     do_syscall_64+0x13e/0x1c0
>     entry_SYSCALL_64_after_hwframe+0x42/0xb7
> 
> Fixes: 71e41286203c ("packet: switch kvzalloc to allocate memory")
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Reported-by: John Sperbeck <jsperbeck@...gle.com>
> Bisected-by: John Sperbeck <jsperbeck@...gle.com>

Oops, applied, thanks Eric.