LoongArch: Mark __percpu functions as always inline

A recent change to the optimization pipeline in LLVM reveals some
fragility around the inlining of LoongArch's __percpu functions, which
manifests as a BUILD_BUG() failure:

  In file included from kernel/sched/build_policy.c:17:
  In file included from include/linux/sched/cputime.h:5:
  In file included from include/linux/sched/signal.h:5:
  In file included from include/linux/rculist.h:11:
  In file included from include/linux/rcupdate.h:26:
  In file included from include/linux/irqflags.h:18:
  arch/loongarch/include/asm/percpu.h:97:3: error: call to '__compiletime_assert_51' declared with 'error' attribute: BUILD_BUG failed
     97 |                 BUILD_BUG();
        |                 ^
  include/linux/build_bug.h:59:21: note: expanded from macro 'BUILD_BUG'
     59 | #define BUILD_BUG() BUILD_BUG_ON_MSG(1, "BUILD_BUG failed")
        |                     ^
  include/linux/build_bug.h:39:37: note: expanded from macro 'BUILD_BUG_ON_MSG'
     39 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
        |                                     ^
  include/linux/compiler_types.h:425:2: note: expanded from macro 'compiletime_assert'
    425 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
        |         ^
  include/linux/compiler_types.h:413:2: note: expanded from macro '_compiletime_assert'
    413 |         __compiletime_assert(condition, msg, prefix, suffix)
        |         ^
  include/linux/compiler_types.h:406:4: note: expanded from macro '__compiletime_assert'
    406 |                         prefix ## suffix();                             \
        |                         ^
  <scratch space>:86:1: note: expanded from here
     86 | __compiletime_assert_51
        | ^
  1 error generated.

If these functions are not inlined (which the compiler is free to do
even with functions marked with the standard 'inline' keyword), the
BUILD_BUG() in the default case cannot be eliminated since the compiler
cannot prove it is never used, resulting in a build failure due to the
error attribute.

Mark these functions as __always_inline to guarantee inlining so that
the BUILD_BUG() only triggers when the default case genuinely cannot be
eliminated due to an unexpected size.

Cc:  <stable@vger.kernel.org>
Closes: https://github.com/ClangBuiltLinux/linux/issues/1955
Fixes: 46859ac8af52 ("LoongArch: Add multi-processor (SMP) support")
Link: https://github.com/llvm/llvm-project/commit/1a2e77cf9e11dbf56b5720c607313a566eebb16e
Suggested-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>

diff --git a/arch/loongarch/include/asm/percpu.h b/arch/loongarch/include/asm/percpu.h
index b9f567e6601668f8e06038f4c15011f7ff7c4798..ed5da02b1cf6f1611ac4b83e560d1f544ed6e270 100644 (file)
--- a/arch/loongarch/include/asm/percpu.h
+++ b/arch/loongarch/include/asm/percpu.h
@@ -32,7 +32,7 @@ static inline void set_my_cpu_offset(unsigned long off)
 #define __my_cpu_offset __my_cpu_offset
 
 #define PERCPU_OP(op, asm_op, c_op)                                    \
-static inline unsigned long __percpu_##op(void *ptr,                   \
+static __always_inline unsigned long __percpu_##op(void *ptr,          \
                        unsigned long val, int size)                    \
 {                                                                      \
        unsigned long ret;                                              \
@@ -63,7 +63,7 @@ PERCPU_OP(and, and, &)
 PERCPU_OP(or, or, |)
 #undef PERCPU_OP
 
-static inline unsigned long __percpu_read(void *ptr, int size)
+static __always_inline unsigned long __percpu_read(void *ptr, int size)
 {
        unsigned long ret;
 
@@ -100,7 +100,7 @@ static inline unsigned long __percpu_read(void *ptr, int size)
        return ret;
 }
 
-static inline void __percpu_write(void *ptr, unsigned long val, int size)
+static __always_inline void __percpu_write(void *ptr, unsigned long val, int size)
 {
        switch (size) {
        case 1:
@@ -132,8 +132,8 @@ static inline void __percpu_write(void *ptr, unsigned long val, int size)
        }
 }
 
-static inline unsigned long __percpu_xchg(void *ptr, unsigned long val,
-                                               int size)
+static __always_inline unsigned long __percpu_xchg(void *ptr, unsigned long val,
+                                                  int size)
 {
        switch (size) {
        case 1: