diff options
| author | Andy Lutomirski <luto@kernel.org> | 2017-12-04 15:07:20 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2017-12-17 13:59:56 +0100 |
| commit | 72f5e08dbba2d01aa90b592cf76c378ea233b00b (patch) | |
| tree | 6289081b74696a9562d06b50e823d6ef1430f66b /arch/x86/kernel/dumpstack.c | |
| parent | 1a935bc3d4ea61556461a9e92a68ca3556232efd (diff) | |
x86/entry: Remap the TSS into the CPU entry area
This has a secondary purpose: it puts the entry stack into a region
with a well-controlled layout. A subsequent patch will take
advantage of this to streamline the SYSCALL entry code to be able to
find it more easily.
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Borislav Petkov <bpetkov@suse.de>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: David Laight <David.Laight@aculab.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Eduardo Valentin <eduval@amazon.com>
Cc: Greg KH <gregkh@linuxfoundation.org>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Juergen Gross <jgross@suse.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: aliguori@amazon.com
Cc: daniel.gruss@iaik.tugraz.at
Cc: hughd@google.com
Cc: keescook@google.com
Link: https://lkml.kernel.org/r/20171204150605.962042855@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/kernel/dumpstack.c')
| -rw-r--r-- | arch/x86/kernel/dumpstack.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/x86/kernel/dumpstack.c b/arch/x86/kernel/dumpstack.c index 64f8ed2a4827..60267850125e 100644 --- a/arch/x86/kernel/dumpstack.c +++ b/arch/x86/kernel/dumpstack.c @@ -45,7 +45,8 @@ bool in_task_stack(unsigned long *stack, struct task_struct *task, bool in_sysenter_stack(unsigned long *stack, struct stack_info *info) { - struct tss_struct *tss = this_cpu_ptr(&cpu_tss); + int cpu = smp_processor_id(); + struct tss_struct *tss = &get_cpu_entry_area(cpu)->tss; /* Treat the canary as part of the stack for unwinding purposes. */ void *begin = &tss->SYSENTER_stack_canary; |