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| author |   Tony Lindgren <tony@atomide.com> | 2016-03-30 10:36:06 -0700 |
|---|---|---|
| committer | Tony Lindgren <tony@atomide.com> | 2016-03-30 10:36:06 -0700 |
| commit | 1809de7e7d37c585e01a1bcc583ea92b78fc759d (patch) | |
| tree | 76c5b35c2b04eafce86a1a729c02ab705eba44bc /kernel/trace/trace_stack.c | |
| parent | ARM: OMAP2+: Use srst_udelay for USB on dm814x (diff) | |
| parent | ARM: OMAP2+: hwmod: Fix updating of sysconfig register (diff) | |
| download | linux-rng-1809de7e7d37c585e01a1bcc583ea92b78fc759d.tar.xz linux-rng-1809de7e7d37c585e01a1bcc583ea92b78fc759d.zip | |
Merge tag 'for-v4.6-rc/omap-fixes-a' of git://git.kernel.org/pub/scm/linux/kernel/git/pjw/omap-pending into omap-for-v4.6/fixes
ARM: OMAP2+: first hwmod fix for v4.6-rc
Fix a longstanding bug in the hwmod code that could cause
hardware SYSCONFIG register values to not match the kernel's
idea of what they should be, and that could result in lower
performance during IP block idle entry.
Basic build, boot, and PM test logs are available here:
http://www.pwsan.com/omap/testlogs/omap-hwmod-fixes-a-for-v4.6-rc/20160326231727/
Diffstat (limited to 'kernel/trace/trace_stack.c')
| -rw-r--r-- | kernel/trace/trace_stack.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/kernel/trace/trace_stack.c b/kernel/trace/trace_stack.c index dda9e6742950..2a1abbaca10e 100644 --- a/kernel/trace/trace_stack.c +++ b/kernel/trace/trace_stack.c @@ -126,6 +126,13 @@ check_stack(unsigned long ip, unsigned long *stack) } /* + * Some archs may not have the passed in ip in the dump. + * If that happens, we need to show everything. + */ + if (i == stack_trace_max.nr_entries) + i = 0; + + /* * Now find where in the stack these are. */ x = 0; @@ -149,7 +156,11 @@ check_stack(unsigned long ip, unsigned long *stack) for (; p < top && i < stack_trace_max.nr_entries; p++) { if (stack_dump_trace[i] == ULONG_MAX) break; - if (*p == stack_dump_trace[i]) { + /* + * The READ_ONCE_NOCHECK is used to let KASAN know that + * this is not a stack-out-of-bounds error. + */ + if ((READ_ONCE_NOCHECK(*p)) == stack_dump_trace[i]) { stack_dump_trace[x] = stack_dump_trace[i++]; this_size = stack_trace_index[x++] = (top - p) * sizeof(unsigned long); |