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Subject[PATCH] LoongArch: Add __percpu annotation for __percpu_read()/__percpu_write()
Date
When build kernel with C=1, we get:

arch/loongarch/kernel/process.c:234:46: warning: incorrect type in argument 1 (different address spaces)
arch/loongarch/kernel/process.c:234:46: expected void *ptr
arch/loongarch/kernel/process.c:234:46: got unsigned long [noderef] __percpu *
arch/loongarch/kernel/process.c:234:46: warning: incorrect type in argument 1 (different address spaces)
arch/loongarch/kernel/process.c:234:46: expected void *ptr
arch/loongarch/kernel/process.c:234:46: got unsigned long [noderef] __percpu *
arch/loongarch/kernel/process.c:234:46: warning: incorrect type in argument 1 (different address spaces)
arch/loongarch/kernel/process.c:234:46: expected void *ptr
arch/loongarch/kernel/process.c:234:46: got unsigned long [noderef] __percpu *
arch/loongarch/kernel/process.c:234:46: warning: incorrect type in argument 1 (different address spaces)
arch/loongarch/kernel/process.c:234:46: expected void *ptr
arch/loongarch/kernel/process.c:234:46: got unsigned long [noderef] __percpu *

Add __percpu annotation for __percpu_read()/__percpu_write() can avoid
such warnings. __percpu_xchg() and other functions don't need annotation
because their wrapper, i.e. _pcp_protect(), already suppresses warnings.

Also adjust the indentations in this file.

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202311080409.LlOfTR3m-lkp@intel.com/
Closes: https://lore.kernel.org/oe-kbuild-all/202311080840.Vc2kXhfp-lkp@intel.com/
Closes: https://lore.kernel.org/oe-kbuild-all/202311081340.3k72KKdg-lkp@intel.com/
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
---
arch/loongarch/include/asm/percpu.h | 11 +++++------
1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/arch/loongarch/include/asm/percpu.h b/arch/loongarch/include/asm/percpu.h
index ed5da02b1cf6..9b36ac003f89 100644
--- a/arch/loongarch/include/asm/percpu.h
+++ b/arch/loongarch/include/asm/percpu.h
@@ -40,13 +40,13 @@ static __always_inline unsigned long __percpu_##op(void *ptr, \
switch (size) { \
case 4: \
__asm__ __volatile__( \
- "am"#asm_op".w" " %[ret], %[val], %[ptr] \n" \
+ "am"#asm_op".w" " %[ret], %[val], %[ptr] \n" \
: [ret] "=&r" (ret), [ptr] "+ZB"(*(u32 *)ptr) \
: [val] "r" (val)); \
break; \
case 8: \
__asm__ __volatile__( \
- "am"#asm_op".d" " %[ret], %[val], %[ptr] \n" \
+ "am"#asm_op".d" " %[ret], %[val], %[ptr] \n" \
: [ret] "=&r" (ret), [ptr] "+ZB"(*(u64 *)ptr) \
: [val] "r" (val)); \
break; \
@@ -63,7 +63,7 @@ PERCPU_OP(and, and, &)
PERCPU_OP(or, or, |)
#undef PERCPU_OP

-static __always_inline unsigned long __percpu_read(void *ptr, int size)
+static __always_inline unsigned long __percpu_read(void __percpu *ptr, int size)
{
unsigned long ret;

@@ -100,7 +100,7 @@ static __always_inline unsigned long __percpu_read(void *ptr, int size)
return ret;
}

-static __always_inline void __percpu_write(void *ptr, unsigned long val, int size)
+static __always_inline void __percpu_write(void __percpu *ptr, unsigned long val, int size)
{
switch (size) {
case 1:
@@ -132,8 +132,7 @@ static __always_inline void __percpu_write(void *ptr, unsigned long val, int siz
}
}

-static __always_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:
--
2.39.3
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