Messages in this thread Patch in this message | | | Date | Thu, 19 Apr 2012 17:27:15 -0700 | From | "tip-bot for H. Peter Anvin" <> | Subject | [tip:x86/extable] x86, extable: Add early_fixup_exception() |
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Commit-ID: 6a1ea279c210e7dc05de86dc29c0d4f577f484fb Gitweb: http://git.kernel.org/tip/6a1ea279c210e7dc05de86dc29c0d4f577f484fb Author: H. Peter Anvin <hpa@linux.intel.com> AuthorDate: Thu, 19 Apr 2012 15:24:20 -0700 Committer: H. Peter Anvin <hpa@linux.intel.com> CommitDate: Thu, 19 Apr 2012 15:31:04 -0700
x86, extable: Add early_fixup_exception()
Add a restricted version of fixup_exception() to be used during early boot only. In particular, this doesn't support the try..catch variant since we may not have a thread_info set up yet.
This relies on the exception table being sorted already at build time.
Link: http://lkml.kernel.org/r/1334794610-5546-1-git-send-email-hpa@zytor.com Signed-off-by: H. Peter Anvin <hpa@linux.intel.com> --- arch/x86/mm/extable.c | 17 +++++++++++++++++ 1 files changed, 17 insertions(+), 0 deletions(-)
diff --git a/arch/x86/mm/extable.c b/arch/x86/mm/extable.c index 1fb85db..5555675 100644 --- a/arch/x86/mm/extable.c +++ b/arch/x86/mm/extable.c @@ -35,3 +35,20 @@ int fixup_exception(struct pt_regs *regs) return 0; } + +/* Restricted version used during very early boot */ +int __init early_fixup_exception(unsigned long *ip) +{ + const struct exception_table_entry *fixup; + + fixup = search_exception_tables(*ip); + if (fixup) { + if (fixup->fixup < 16) + return 0; /* Not supported during early boot */ + + *ip = fixup->fixup; + return 1; + } + + return 0; +}
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