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path: root/net/6lowpan/nhc_ipv6.c
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/*
 *	6LoWPAN IPv6 Header compression according to RFC6282
 *
 *	This program is free software; you can redistribute it and/or
 *	modify it under the terms of the GNU General Public License
 *	as published by the Free Software Foundation; either version
 *	2 of the License, or (at your option) any later version.
 */

#include "nhc.h"

#define LOWPAN_NHC_IPV6_IDLEN	1
#define LOWPAN_NHC_IPV6_ID_0	0xee
#define LOWPAN_NHC_IPV6_MASK_0	0xfe

static void ipv6_nhid_setup(struct lowpan_nhc *nhc)
{
	nhc->id[0] = LOWPAN_NHC_IPV6_ID_0;
	nhc->idmask[0] = LOWPAN_NHC_IPV6_MASK_0;
}

LOWPAN_NHC(nhc_ipv6, "RFC6282 IPv6", NEXTHDR_IPV6, 0, ipv6_nhid_setup,
	   LOWPAN_NHC_IPV6_IDLEN, NULL, NULL);

module_lowpan_nhc(nhc_ipv6);
MODULE_DESCRIPTION("6LoWPAN next header RFC6282 IPv6 compression");
MODULE_LICENSE("GPL");
>098a7c0ca4fceb8a65cb1f693c9d71990388933d /net/rds/ib_send.c parenta0615a16f7d0ceb5804d295203c302d496d8ee91 (diff)
powerpc/mm: Fix spurrious segfaults on radix with autonuma
When autonuma (Automatic NUMA balancing) marks a PTE inaccessible it clears all the protection bits but leave the PTE valid. With the Radix MMU, an attempt at executing from such a PTE will take a fault with bit 35 of SRR1 set "SRR1_ISI_N_OR_G". It is thus incorrect to treat all such faults as errors. We should pass them to handle_mm_fault() for autonuma to deal with. The case of pages that are really not executable is handled by the existing test for VM_EXEC further down. That leaves us with catching the kernel attempts at executing user pages. We can catch that earlier, even before we do find_vma. It is never valid on powerpc for the kernel to take an exec fault to begin with. So fold that test with the existing test for the kernel faulting on kernel addresses to bail out early. Fixes: 1d18ad026844 ("powerpc/mm: Detect instruction fetch denied and report") Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Acked-by: Balbir Singh <bsingharora@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'net/rds/ib_send.c')