include/linux/compiler.h: fix Oops for Clang-compiled kernels (bfafddd8) · Commits · 戴 / test

GCC unescapes escaped string section names while Clang does not. Because __section uses the `#` stringification operator for the section name, it doesn't need to be escaped. This fixes an Oops observed in distro's that use systemd and not net.core.bpf_jit_enable=1, when their kernels are compiled with Clang. Link: https://github.com/ClangBuiltLinux/linux/issues/619 Link: https://bugs.llvm.org/show_bug.cgi?id=42950 Link: https://marc.info/?l=linux-netdev&m=156412960619946&w=2 Link: https://lore.kernel.org/lkml/20190904181740.GA19688@gmail.com/ Acked-by:

Nick Desaulniers <ndesaulniers@google.com> [Cherry-picked from the __section cleanup series for 5.3] [Adjusted commit message] Signed-off-by:

include/linux/compiler.h

+4 −4

Original line number	Diff line number	Diff line
		@@ -24,7 +24,7 @@ void ftrace_likely_update(struct ftrace_likely_data *f, int val,
		long ______r; \
		static struct ftrace_likely_data \
		__aligned(4) \
		__section("_ftrace_annotated_branch") \
		__section(_ftrace_annotated_branch) \
		______f = { \
		.data.func = __func__, \
		.data.file = __FILE__, \
		@@ -60,7 +60,7 @@ void ftrace_likely_update(struct ftrace_likely_data *f, int val,
		#define __trace_if_value(cond) ({ \
		static struct ftrace_branch_data \
		__aligned(4) \
		__section("_ftrace_branch") \
		__section(_ftrace_branch) \
		__if_trace = { \
		.func = __func__, \
		.file = __FILE__, \
		@@ -118,7 +118,7 @@ void ftrace_likely_update(struct ftrace_likely_data *f, int val,
		".popsection\n\t"

		/* Annotate a C jump table to allow objtool to follow the code flow */
		#define __annotate_jump_table __section(".rodata..c_jump_table")
		#define __annotate_jump_table __section(.rodata..c_jump_table)

		#else
		#define annotate_reachable()
		@@ -298,7 +298,7 @@ unsigned long read_word_at_a_time(const void *addr)
		* visible to the compiler.
		*/
		#define __ADDRESSABLE(sym) \
		static void * __section(".discard.addressable") __used \
		static void * __section(.discard.addressable) __used \
		__PASTE(__addressable_##sym, __LINE__) = (void *)&sym;

		/**