Date: Thu, 19 Jan 2017 23:44:05 +0000 (UTC) From: Ravi Pokala <rpokala@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-10@freebsd.org Subject: svn commit: r312442 - stable/10/sys/kern Message-ID: <201701192344.v0JNi5qQ003805@repo.freebsd.org>
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Author: rpokala Date: Thu Jan 19 23:44:05 2017 New Revision: 312442 URL: https://svnweb.freebsd.org/changeset/base/312442 Log: MFC r311963: Remove writability requirement for single-mbuf, contiguous- range m_pulldown() m_pulldown() only needs to determine if a mbuf is writable if it is going to copy data into the data region of an existing mbuf. It does this to create a contiguous data region in a single mbuf from multiple mbufs in the chain. If the requested memory region is already contiguous and nothing needs to change, the mbuf does not need to be writeable. Modified: stable/10/sys/kern/uipc_mbuf2.c Directory Properties: stable/10/ (props changed) Modified: stable/10/sys/kern/uipc_mbuf2.c ============================================================================== --- stable/10/sys/kern/uipc_mbuf2.c Thu Jan 19 23:42:51 2017 (r312441) +++ stable/10/sys/kern/uipc_mbuf2.c Thu Jan 19 23:44:05 2017 (r312442) @@ -161,7 +161,7 @@ m_pulldown(struct mbuf *m, int off, int * the target data is on <n, off>. * if we got enough data on the mbuf "n", we're done. */ - if ((off == 0 || offp) && len <= n->m_len - off && writable) + if ((off == 0 || offp) && len <= n->m_len - off) goto ok; /*
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