From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
alan@lxorguk.ukuu.org.uk, "David S. Miller" <davem@davemloft.net>
Subject: [ 24/31] sparc64: Like x86 we should check current->mm during perf backtrace generation.
Date: Thu, 25 Oct 2012 17:04:31 -0700 [thread overview]
Message-ID: <20121026000217.407938257@linuxfoundation.org> (raw)
In-Reply-To: <20121026000214.941721299@linuxfoundation.org>
3.0-stable review patch. If anyone has any objections, please let me know.
------------------
From: "David S. Miller" <davem@davemloft.net>
[ Upstream commit 08280e6c4c2e8049ac61d9e8e3536ec1df629c0d ]
If the MM is not active, only report the top-level PC. Do not try to
access the address space.
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
arch/sparc/kernel/perf_event.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)
--- a/arch/sparc/kernel/perf_event.c
+++ b/arch/sparc/kernel/perf_event.c
@@ -1380,8 +1380,6 @@ static void perf_callchain_user_64(struc
{
unsigned long ufp;
- perf_callchain_store(entry, regs->tpc);
-
ufp = regs->u_regs[UREG_I6] + STACK_BIAS;
do {
struct sparc_stackf *usf, sf;
@@ -1402,8 +1400,6 @@ static void perf_callchain_user_32(struc
{
unsigned long ufp;
- perf_callchain_store(entry, regs->tpc);
-
ufp = regs->u_regs[UREG_I6] & 0xffffffffUL;
do {
struct sparc_stackf32 *usf, sf;
@@ -1422,6 +1418,11 @@ static void perf_callchain_user_32(struc
void
perf_callchain_user(struct perf_callchain_entry *entry, struct pt_regs *regs)
{
+ perf_callchain_store(entry, regs->tpc);
+
+ if (!current->mm)
+ return;
+
flushw_user();
if (test_thread_flag(TIF_32BIT))
perf_callchain_user_32(entry, regs);
next prev parent reply other threads:[~2012-10-26 0:06 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-26 0:04 [ 00/31] 3.0.49-stable review Greg Kroah-Hartman
2012-10-26 0:04 ` [ 01/31] arch/tile: avoid generating .eh_frame information in modules Greg Kroah-Hartman
2012-10-26 0:04 ` [ 02/31] NLM: nlm_lookup_file() may return NLMv4-specific error codes Greg Kroah-Hartman
2012-10-26 0:04 ` [ 03/31] oprofile, x86: Fix wrapping bug in op_x86_get_ctrl() Greg Kroah-Hartman
2012-10-26 0:04 ` [ 04/31] SUNRPC: Prevent kernel stack corruption on long values of flush Greg Kroah-Hartman
2012-10-26 0:04 ` [ 05/31] Revert: lockd: use rpc clients cl_nodename for id encoding Greg Kroah-Hartman
2012-10-26 0:04 ` [ 06/31] pcmcia: sharpsl: dont discard sharpsl_pcmcia_ops Greg Kroah-Hartman
2012-10-26 0:04 ` [ 07/31] kernel/sys.c: fix stack memory content leak via UNAME26 Greg Kroah-Hartman
2012-10-26 0:04 ` [ 08/31] use clamp_t in UNAME26 fix Greg Kroah-Hartman
2012-10-26 0:11 ` Jonathan Nieder
2012-10-26 2:28 ` Greg Kroah-Hartman
2012-10-26 8:07 ` Jonathan Nieder
2012-10-26 0:04 ` [ 09/31] x86: Exclude E820_RESERVED regions and memory holes above 4 GB from direct mapping Greg Kroah-Hartman
2012-10-26 0:04 ` [ 10/31] xen/x86: dont corrupt %eip when returning from a signal handler Greg Kroah-Hartman
2012-10-26 0:04 ` [ 11/31] USB: cdc-acm: fix pipe type of write endpoint Greg Kroah-Hartman
2012-10-26 0:04 ` [ 12/31] usb: acm: fix the computation of the number of data bits Greg Kroah-Hartman
2012-10-26 0:04 ` [ 13/31] USB: option: blacklist net interface on ZTE devices Greg Kroah-Hartman
2012-10-26 0:04 ` [ 14/31] USB: option: add more " Greg Kroah-Hartman
2012-10-26 0:04 ` [ 15/31] cgroup: notify_on_release may not be triggered in some cases Greg Kroah-Hartman
2012-10-26 0:04 ` [ 16/31] amd64_edac:__amd64_set_scrub_rate(): avoid overindexing scrubrates[] Greg Kroah-Hartman
2012-10-26 0:04 ` [ 17/31] media: au0828: fix case where STREAMOFF being called on stopped stream causes BUG() Greg Kroah-Hartman
2012-10-26 0:04 ` [ 18/31] drm/i915: apply timing generator bug workaround on CPT and PPT Greg Kroah-Hartman
2012-10-26 0:04 ` [ 19/31] net: Fix skb_under_panic oops in neigh_resolve_output Greg Kroah-Hartman
2012-10-26 0:04 ` [ 20/31] skge: Add DMA mask quirk for Marvell 88E8001 on ASUS P5NSLI motherboard Greg Kroah-Hartman
2012-10-26 0:04 ` [ 21/31] RDS: fix rds-ping spinlock recursion Greg Kroah-Hartman
2012-10-26 0:04 ` [ 22/31] tcp: resets are misrouted Greg Kroah-Hartman
2012-10-26 0:04 ` [ 23/31] sparc64: fix ptrace interaction with force_successful_syscall_return() Greg Kroah-Hartman
2012-10-26 0:04 ` Greg Kroah-Hartman [this message]
2012-10-26 0:04 ` [ 25/31] sparc64: Fix bit twiddling in sparc_pmu_enable_event() Greg Kroah-Hartman
2012-10-26 0:04 ` [ 26/31] sparc64: do not clobber personality flags in sys_sparc64_personality() Greg Kroah-Hartman
2012-10-26 0:04 ` [ 27/31] sparc64: Be less verbose during vmemmap population Greg Kroah-Hartman
2012-10-26 0:04 ` [ 28/31] xHCI: add cmd_ring_state Greg Kroah-Hartman
2012-10-26 0:04 ` [ 29/31] xHCI: add aborting command ring function Greg Kroah-Hartman
2012-10-26 0:04 ` [ 30/31] xHCI: cancel command after command timeout Greg Kroah-Hartman
2012-10-26 0:04 ` [ 31/31] xHCI: handle command after aborting the command ring Greg Kroah-Hartman
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