diff mbox series

[-next,V8,01/14] compiler_types.h: Add __noinstr_section() for noinstr

Message ID 20221103075047.1634923-2-guoren@kernel.org (mailing list archive)
State Superseded
Headers show
Series riscv: Add GENERIC_ENTRY support and related features | expand

Checks

Context Check Description
conchuod/cc_maintainers warning 4 maintainers not CCed: aou@eecs.berkeley.edu akpm@linux-foundation.org ast@kernel.org haoluo@google.com
conchuod/patch_count success Link
conchuod/cover_letter success Series has a cover letter
conchuod/tree_selection success Guessed tree name to be for-next
conchuod/fixes_present success Fixes tag not required for -next series
conchuod/verify_signedoff success Signed-off-by tag matches author and committer
conchuod/kdoc success Errors and warnings before: 0 this patch: 0
conchuod/module_param success Was 0 now: 0
conchuod/build_warn_rv64 fail Errors and warnings before: 0 this patch: 0
conchuod/dtb_warn_rv64 success Errors and warnings before: 0 this patch: 0
conchuod/header_inline success No static functions without inline keyword in header files
conchuod/checkpatch fail ERROR: Macros with complex values should be enclosed in parentheses
conchuod/source_inline success Was 0 now: 0
conchuod/verify_fixes success No Fixes tag

Commit Message

Guo Ren Nov. 3, 2022, 7:50 a.m. UTC 
From: Lai Jiangshan <laijs@linux.alibaba.com>

And it will be extended for C entry code.

Cc: Borislav Petkov <bp@alien8.de>
Reviewed-by: Miguel Ojeda <ojeda@kernel.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Suggested-by: Nick Desaulniers <ndesaulniers@google.com>
Suggested-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Lai Jiangshan <laijs@linux.alibaba.com>
Signed-off-by: Guo Ren <guoren@kernel.org>
---
 include/linux/compiler_types.h | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

Comments

Björn Töpel Dec. 5, 2022, 9:12 a.m. UTC | #1 
guoren@kernel.org writes:

> From: Lai Jiangshan <laijs@linux.alibaba.com>
>
> And it will be extended for C entry code.

It would be nice with a more elaborative commit message.
diff mbox series

Patch

diff --git a/include/linux/compiler_types.h b/include/linux/compiler_types.h
index eb0466236661..41e4faa4cd95 100644
--- a/include/linux/compiler_types.h
+++ b/include/linux/compiler_types.h
@@ -230,12 +230,19 @@  struct ftrace_likely_data {
 #define __no_sanitize_or_inline __always_inline
 #endif
 
-/* Section for code which can't be instrumented at all */
-#define noinstr								\
-	noinline notrace __attribute((__section__(".noinstr.text")))	\
-	__no_kcsan __no_sanitize_address __no_profile __no_sanitize_coverage \
+/*
+ * Using __noinstr_section() doesn't automatically disable all instrumentations
+ * on the section.  Inhibition for some instrumentations requires extra code.
+ * I.E. KPROBES explicitly avoids instrumenting on .noinstr.text.
+ */
+#define __noinstr_section(section)				\
+	noinline notrace __section(section) __no_profile	\
+	__no_kcsan __no_sanitize_address __no_sanitize_coverage	\
 	__no_sanitize_memory
 
+/* Section for code which can't be instrumented at all */
+#define noinstr __noinstr_section(".noinstr.text")
+
 #endif /* __KERNEL__ */
 
 #endif /* __ASSEMBLY__ */