From: Oleg Nesterov <oleg@redhat.com>
Date: Mon, 19 May 2014 14:13:34 +0000 (+0200)
Subject: uprobes: Teach copy_insn() to support tmpfs
X-Git-Tag: omap-for-v3.16/fixes-against-rc1~34^2~2^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=45e0a79a82d31ddfa4c7c1dd9751ca48406f2fa4;p=pandora-kernel.git

uprobes: Teach copy_insn() to support tmpfs

tmpfs is widely used but as Denys reports shmem_aops doesn't have
->readpage() and thus you can't probe a binary on this filesystem.

As Hugh suggested we can use shmem_read_mapping_page() in this case,
just we need to check shmem_mapping() if ->readpage == NULL.

Reported-by: Denys Vlasenko <dvlasenk@redhat.com>
Suggested-by: Hugh Dickins <hughd@google.com>
Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
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