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| From | tip-bot for Borislav Petkov <tipbot@zytor.com> |
| Newsgroups | linux.kernel |
| Subject | [tip:x86/asm] x86/alternatives: Add an auxilary section |
| Date | Sat, 30 Jan 2016 14:30:02 +0100 |
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| Git-Commit-ID | 337e4cc84021212a87b04b77b65cccc49304909e |
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Commit-ID: 337e4cc84021212a87b04b77b65cccc49304909e
Gitweb: http://git.kernel.org/tip/337e4cc84021212a87b04b77b65cccc49304909e
Author: Borislav Petkov <bp@suse.de>
AuthorDate: Tue, 26 Jan 2016 22:12:07 +0100
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Sat, 30 Jan 2016 11:22:20 +0100
x86/alternatives: Add an auxilary section
Add .altinstr_aux for additional instructions which will be used
before and/or during patching. All stuff which needs more
sophisticated patching should go there. See next patch.
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1453842730-28463-8-git-send-email-bp@alien8.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
arch/x86/kernel/vmlinux.lds.S | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/arch/x86/kernel/vmlinux.lds.S b/arch/x86/kernel/vmlinux.lds.S
index 74e4bf1..92dc211 100644
--- a/arch/x86/kernel/vmlinux.lds.S
+++ b/arch/x86/kernel/vmlinux.lds.S
@@ -195,6 +195,17 @@ SECTIONS
:init
#endif
+ /*
+ * Section for code used exclusively before alternatives are run. All
+ * references to such code must be patched out by alternatives, normally
+ * by using X86_FEATURE_ALWAYS CPU feature bit.
+ *
+ * See static_cpu_has() for an example.
+ */
+ .altinstr_aux : AT(ADDR(.altinstr_aux) - LOAD_OFFSET) {
+ *(.altinstr_aux)
+ }
+
INIT_DATA_SECTION(16)
.x86_cpu_dev.init : AT(ADDR(.x86_cpu_dev.init) - LOAD_OFFSET) {
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[tip:x86/asm] x86/alternatives: Add an auxilary section tip-bot for Borislav Petkov <tipbot@zytor.com> - 2016-01-30 14:30 +0100
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