[49/87] sections: provide internal __is_kernel() and __is_kernel_text() helper

Commit Message

Andrew Morton Nov. 9, 2021, 2:34 a.m. UTC

From: Kefeng Wang <[e-mail]>
Subject: sections: provide internal __is_kernel() and __is_kernel_text() helper

An internal __is_kernel() helper which only check the kernel address
ranges, and an internal __is_kernel_text() helper which only check text
section ranges.

Link: https://lkml.kernel.org/r/[e-mail]
Signed-off-by: Kefeng Wang <[e-mail]>
Reviewed-by: Sergey Senozhatsky <[e-mail]>
Cc: Alexander Potapenko <[e-mail]>
Cc: Alexei Starovoitov <[e-mail]>
Cc: Andrey Konovalov <[e-mail]>
Cc: Andrey Ryabinin <[e-mail]>
Cc: Arnd Bergmann <[e-mail]>
Cc: Benjamin Herrenschmidt <[e-mail]>
Cc: Borislav Petkov <[e-mail]>
Cc: Christophe Leroy <[e-mail]>
Cc: "David S. Miller" <[e-mail]>
Cc: Dmitry Vyukov <[e-mail]>
Cc: Ingo Molnar <[e-mail]>
Cc: Ivan Kokshaysky <[e-mail]>
Cc: Matt Turner <[e-mail]>
Cc: Michael Ellerman <[e-mail]>
Cc: Michal Simek <[e-mail]>
Cc: Paul Mackerras <[e-mail]>
Cc: Petr Mladek <[e-mail]>
Cc: Richard Henderson <[e-mail]>
Cc: Steven Rostedt <[e-mail]>
Cc: Thomas Gleixner <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
---

 include/asm-generic/sections.h |   29 +++++++++++++++++++++++++++++
 include/linux/kallsyms.h       |    4 ++--
 2 files changed, 31 insertions(+), 2 deletions(-)

Patch

--- a/include/asm-generic/sections.h~sections-provide-internal-__is_kernel-and-__is_kernel_text-helper
+++ a/include/asm-generic/sections.h
@@ -172,4 +172,33 @@  static inline bool is_kernel_inittext(un
 	       addr < (unsigned long)_einittext;
 }
 
+/**
+ * __is_kernel_text - checks if the pointer address is located in the
+ *                    .text section
+ *
+ * @addr: address to check
+ *
+ * Returns: true if the address is located in .text, false otherwise.
+ * Note: an internal helper, only check the range of _stext to _etext.
+ */
+static inline bool __is_kernel_text(unsigned long addr)
+{
+	return addr >= (unsigned long)_stext &&
+	       addr < (unsigned long)_etext;
+}
+
+/**
+ * __is_kernel - checks if the pointer address is located in the kernel range
+ *
+ * @addr: address to check
+ *
+ * Returns: true if the address is located in the kernel range, false otherwise.
+ * Note: an internal helper, only check the range of _stext to _end.
+ */
+static inline bool __is_kernel(unsigned long addr)
+{
+	return addr >= (unsigned long)_stext &&
+	       addr < (unsigned long)_end;
+}
+
 #endif /* _ASM_GENERIC_SECTIONS_H_ */
--- a/include/linux/kallsyms.h~sections-provide-internal-__is_kernel-and-__is_kernel_text-helper
+++ a/include/linux/kallsyms.h
@@ -26,14 +26,14 @@  struct module;
 
 static inline int is_kernel_text(unsigned long addr)
 {
-	if ((addr >= (unsigned long)_stext && addr < (unsigned long)_etext))
+	if (__is_kernel_text(addr))
 		return 1;
 	return in_gate_area_no_mm(addr);
 }
 
 static inline int is_kernel(unsigned long addr)
 {
-	if (addr >= (unsigned long)_stext && addr < (unsigned long)_end)
+	if (__is_kernel(addr))
 		return 1;
 	return in_gate_area_no_mm(addr);
 }