Like the __section macro, the __alias macro uses
macro # stringification to create quotes around
the section name used in the __attribute__.
Remove the stringification and add quotes or a
stringification to the uses instead.
Signed-off-by: Joe Perches <[email protected]>
---
There is a script that might eventually be applied
to convert the __section macro definition and uses
to remove stringification
https://lore.kernel.org/lkml/[email protected]/
https://lore.kernel.org/lkml/[email protected]/
This patch is intended to create commonality
between the uses of __section and __alias.
arch/x86/boot/compressed/string.c | 6 +++---
arch/x86/include/asm/syscall_wrapper.h | 2 +-
drivers/firmware/efi/runtime-wrappers.c | 2 +-
include/linux/compiler_attributes.h | 2 +-
kernel/kcsan/core.c | 10 +++++-----
lib/crc32.c | 4 ++--
lib/crypto/aes.c | 4 ++--
mm/kasan/generic.c | 8 ++++----
8 files changed, 19 insertions(+), 19 deletions(-)
diff --git a/arch/x86/boot/compressed/string.c b/arch/x86/boot/compressed/string.c
index 81fc1eaa3229..d38b122f51ef 100644
--- a/arch/x86/boot/compressed/string.c
+++ b/arch/x86/boot/compressed/string.c
@@ -75,7 +75,7 @@ void *memcpy(void *dest, const void *src, size_t n)
}
#ifdef CONFIG_KASAN
-extern void *__memset(void *s, int c, size_t n) __alias(memset);
-extern void *__memmove(void *dest, const void *src, size_t n) __alias(memmove);
-extern void *__memcpy(void *dest, const void *src, size_t n) __alias(memcpy);
+extern void *__memset(void *s, int c, size_t n) __alias("memset");
+extern void *__memmove(void *dest, const void *src, size_t n) __alias("memmove");
+extern void *__memcpy(void *dest, const void *src, size_t n) __alias("memcpy");
#endif
diff --git a/arch/x86/include/asm/syscall_wrapper.h b/arch/x86/include/asm/syscall_wrapper.h
index a84333adeef2..f19d1bbbff3d 100644
--- a/arch/x86/include/asm/syscall_wrapper.h
+++ b/arch/x86/include/asm/syscall_wrapper.h
@@ -69,7 +69,7 @@ extern long __ia32_sys_ni_syscall(const struct pt_regs *regs);
long __##abi##_##name(const struct pt_regs *regs); \
ALLOW_ERROR_INJECTION(__##abi##_##name, ERRNO); \
long __##abi##_##name(const struct pt_regs *regs) \
- __alias(__do_##name);
+ __alias("__do_" #name);
#define __SYS_STUBx(abi, name, ...) \
long __##abi##_##name(const struct pt_regs *regs); \
diff --git a/drivers/firmware/efi/runtime-wrappers.c b/drivers/firmware/efi/runtime-wrappers.c
index 1410beaef5c3..14e380ac65d4 100644
--- a/drivers/firmware/efi/runtime-wrappers.c
+++ b/drivers/firmware/efi/runtime-wrappers.c
@@ -162,7 +162,7 @@ static DEFINE_SEMAPHORE(efi_runtime_lock);
* Expose the EFI runtime lock to the UV platform
*/
#ifdef CONFIG_X86_UV
-extern struct semaphore __efi_uv_runtime_lock __alias(efi_runtime_lock);
+extern struct semaphore __efi_uv_runtime_lock __alias("efi_runtime_lock");
#endif
/*
diff --git a/include/linux/compiler_attributes.h b/include/linux/compiler_attributes.h
index ea7b756b1c8f..4819512c9abd 100644
--- a/include/linux/compiler_attributes.h
+++ b/include/linux/compiler_attributes.h
@@ -42,7 +42,7 @@
/*
* gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-alias-function-attribute
*/
-#define __alias(symbol) __attribute__((__alias__(#symbol)))
+#define __alias(symbol) __attribute__((__alias__(symbol)))
/*
* gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-aligned-function-attribute
diff --git a/kernel/kcsan/core.c b/kernel/kcsan/core.c
index 3994a217bde7..465f6cfc317c 100644
--- a/kernel/kcsan/core.c
+++ b/kernel/kcsan/core.c
@@ -814,7 +814,7 @@ EXPORT_SYMBOL(__kcsan_check_access);
} \
EXPORT_SYMBOL(__tsan_read##size); \
void __tsan_unaligned_read##size(void *ptr) \
- __alias(__tsan_read##size); \
+ __alias("__tsan_read" #size); \
EXPORT_SYMBOL(__tsan_unaligned_read##size); \
void __tsan_write##size(void *ptr); \
void __tsan_write##size(void *ptr) \
@@ -823,7 +823,7 @@ EXPORT_SYMBOL(__kcsan_check_access);
} \
EXPORT_SYMBOL(__tsan_write##size); \
void __tsan_unaligned_write##size(void *ptr) \
- __alias(__tsan_write##size); \
+ __alias("__tsan_write" #size); \
EXPORT_SYMBOL(__tsan_unaligned_write##size); \
void __tsan_read_write##size(void *ptr); \
void __tsan_read_write##size(void *ptr) \
@@ -833,7 +833,7 @@ EXPORT_SYMBOL(__kcsan_check_access);
} \
EXPORT_SYMBOL(__tsan_read_write##size); \
void __tsan_unaligned_read_write##size(void *ptr) \
- __alias(__tsan_read_write##size); \
+ __alias("__tsan_read_write" #size); \
EXPORT_SYMBOL(__tsan_unaligned_read_write##size)
DEFINE_TSAN_READ_WRITE(1);
@@ -877,7 +877,7 @@ EXPORT_SYMBOL(__tsan_write_range);
} \
EXPORT_SYMBOL(__tsan_volatile_read##size); \
void __tsan_unaligned_volatile_read##size(void *ptr) \
- __alias(__tsan_volatile_read##size); \
+ __alias("__tsan_volatile_read" #size); \
EXPORT_SYMBOL(__tsan_unaligned_volatile_read##size); \
void __tsan_volatile_write##size(void *ptr); \
void __tsan_volatile_write##size(void *ptr) \
@@ -892,7 +892,7 @@ EXPORT_SYMBOL(__tsan_write_range);
} \
EXPORT_SYMBOL(__tsan_volatile_write##size); \
void __tsan_unaligned_volatile_write##size(void *ptr) \
- __alias(__tsan_volatile_write##size); \
+ __alias("__tsan_volatile_write" #size); \
EXPORT_SYMBOL(__tsan_unaligned_volatile_write##size)
DEFINE_TSAN_VOLATILE_READ_WRITE(1);
diff --git a/lib/crc32.c b/lib/crc32.c
index 2a68dfd3b96c..373a17aaa432 100644
--- a/lib/crc32.c
+++ b/lib/crc32.c
@@ -206,8 +206,8 @@ u32 __pure __weak __crc32c_le(u32 crc, unsigned char const *p, size_t len)
EXPORT_SYMBOL(crc32_le);
EXPORT_SYMBOL(__crc32c_le);
-u32 __pure crc32_le_base(u32, unsigned char const *, size_t) __alias(crc32_le);
-u32 __pure __crc32c_le_base(u32, unsigned char const *, size_t) __alias(__crc32c_le);
+u32 __pure crc32_le_base(u32, unsigned char const *, size_t) __alias("crc32_le");
+u32 __pure __crc32c_le_base(u32, unsigned char const *, size_t) __alias("__crc32c_le");
/*
* This multiplies the polynomials x and y modulo the given modulus.
diff --git a/lib/crypto/aes.c b/lib/crypto/aes.c
index 827fe89922ff..5b80514595c2 100644
--- a/lib/crypto/aes.c
+++ b/lib/crypto/aes.c
@@ -82,8 +82,8 @@ static volatile const u8 __cacheline_aligned aes_inv_sbox[] = {
0xe1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0c, 0x7d,
};
-extern const u8 crypto_aes_sbox[256] __alias(aes_sbox);
-extern const u8 crypto_aes_inv_sbox[256] __alias(aes_inv_sbox);
+extern const u8 crypto_aes_sbox[256] __alias("aes_sbox");
+extern const u8 crypto_aes_inv_sbox[256] __alias("aes_inv_sbox");
EXPORT_SYMBOL(crypto_aes_sbox);
EXPORT_SYMBOL(crypto_aes_inv_sbox);
diff --git a/mm/kasan/generic.c b/mm/kasan/generic.c
index 248264b9cb76..4496f897e4f5 100644
--- a/mm/kasan/generic.c
+++ b/mm/kasan/generic.c
@@ -234,7 +234,7 @@ EXPORT_SYMBOL(__asan_unregister_globals);
check_memory_region_inline(addr, size, false, _RET_IP_);\
} \
EXPORT_SYMBOL(__asan_load##size); \
- __alias(__asan_load##size) \
+ __alias("__asan_load" #size) \
void __asan_load##size##_noabort(unsigned long); \
EXPORT_SYMBOL(__asan_load##size##_noabort); \
void __asan_store##size(unsigned long addr) \
@@ -242,7 +242,7 @@ EXPORT_SYMBOL(__asan_unregister_globals);
check_memory_region_inline(addr, size, true, _RET_IP_); \
} \
EXPORT_SYMBOL(__asan_store##size); \
- __alias(__asan_store##size) \
+ __alias("__asan_store" #size) \
void __asan_store##size##_noabort(unsigned long); \
EXPORT_SYMBOL(__asan_store##size##_noabort)
@@ -258,7 +258,7 @@ void __asan_loadN(unsigned long addr, size_t size)
}
EXPORT_SYMBOL(__asan_loadN);
-__alias(__asan_loadN)
+__alias("__asan_loadN")
void __asan_loadN_noabort(unsigned long, size_t);
EXPORT_SYMBOL(__asan_loadN_noabort);
@@ -268,7 +268,7 @@ void __asan_storeN(unsigned long addr, size_t size)
}
EXPORT_SYMBOL(__asan_storeN);
-__alias(__asan_storeN)
+__alias("__asan_storeN")
void __asan_storeN_noabort(unsigned long, size_t);
EXPORT_SYMBOL(__asan_storeN_noabort);
On Wed, 21 Oct 2020 at 20:58, Joe Perches <[email protected]> wrote:
>
> Like the __section macro, the __alias macro uses
> macro # stringification to create quotes around
> the section name used in the __attribute__.
>
> Remove the stringification and add quotes or a
> stringification to the uses instead.
>
Why?
> Signed-off-by: Joe Perches <[email protected]>
> ---
>
> There is a script that might eventually be applied
> to convert the __section macro definition and uses
> to remove stringification
>
> https://lore.kernel.org/lkml/[email protected]/
> https://lore.kernel.org/lkml/[email protected]/
>
> This patch is intended to create commonality
> between the uses of __section and __alias.
>
> arch/x86/boot/compressed/string.c | 6 +++---
> arch/x86/include/asm/syscall_wrapper.h | 2 +-
> drivers/firmware/efi/runtime-wrappers.c | 2 +-
> include/linux/compiler_attributes.h | 2 +-
> kernel/kcsan/core.c | 10 +++++-----
> lib/crc32.c | 4 ++--
> lib/crypto/aes.c | 4 ++--
> mm/kasan/generic.c | 8 ++++----
> 8 files changed, 19 insertions(+), 19 deletions(-)
>
> diff --git a/arch/x86/boot/compressed/string.c b/arch/x86/boot/compressed/string.c
> index 81fc1eaa3229..d38b122f51ef 100644
> --- a/arch/x86/boot/compressed/string.c
> +++ b/arch/x86/boot/compressed/string.c
> @@ -75,7 +75,7 @@ void *memcpy(void *dest, const void *src, size_t n)
> }
>
> #ifdef CONFIG_KASAN
> -extern void *__memset(void *s, int c, size_t n) __alias(memset);
> -extern void *__memmove(void *dest, const void *src, size_t n) __alias(memmove);
> -extern void *__memcpy(void *dest, const void *src, size_t n) __alias(memcpy);
> +extern void *__memset(void *s, int c, size_t n) __alias("memset");
> +extern void *__memmove(void *dest, const void *src, size_t n) __alias("memmove");
> +extern void *__memcpy(void *dest, const void *src, size_t n) __alias("memcpy");
> #endif
> diff --git a/arch/x86/include/asm/syscall_wrapper.h b/arch/x86/include/asm/syscall_wrapper.h
> index a84333adeef2..f19d1bbbff3d 100644
> --- a/arch/x86/include/asm/syscall_wrapper.h
> +++ b/arch/x86/include/asm/syscall_wrapper.h
> @@ -69,7 +69,7 @@ extern long __ia32_sys_ni_syscall(const struct pt_regs *regs);
> long __##abi##_##name(const struct pt_regs *regs); \
> ALLOW_ERROR_INJECTION(__##abi##_##name, ERRNO); \
> long __##abi##_##name(const struct pt_regs *regs) \
> - __alias(__do_##name);
> + __alias("__do_" #name);
>
> #define __SYS_STUBx(abi, name, ...) \
> long __##abi##_##name(const struct pt_regs *regs); \
> diff --git a/drivers/firmware/efi/runtime-wrappers.c b/drivers/firmware/efi/runtime-wrappers.c
> index 1410beaef5c3..14e380ac65d4 100644
> --- a/drivers/firmware/efi/runtime-wrappers.c
> +++ b/drivers/firmware/efi/runtime-wrappers.c
> @@ -162,7 +162,7 @@ static DEFINE_SEMAPHORE(efi_runtime_lock);
> * Expose the EFI runtime lock to the UV platform
> */
> #ifdef CONFIG_X86_UV
> -extern struct semaphore __efi_uv_runtime_lock __alias(efi_runtime_lock);
> +extern struct semaphore __efi_uv_runtime_lock __alias("efi_runtime_lock");
> #endif
>
> /*
> diff --git a/include/linux/compiler_attributes.h b/include/linux/compiler_attributes.h
> index ea7b756b1c8f..4819512c9abd 100644
> --- a/include/linux/compiler_attributes.h
> +++ b/include/linux/compiler_attributes.h
> @@ -42,7 +42,7 @@
> /*
> * gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-alias-function-attribute
> */
> -#define __alias(symbol) __attribute__((__alias__(#symbol)))
> +#define __alias(symbol) __attribute__((__alias__(symbol)))
>
> /*
> * gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-aligned-function-attribute
> diff --git a/kernel/kcsan/core.c b/kernel/kcsan/core.c
> index 3994a217bde7..465f6cfc317c 100644
> --- a/kernel/kcsan/core.c
> +++ b/kernel/kcsan/core.c
> @@ -814,7 +814,7 @@ EXPORT_SYMBOL(__kcsan_check_access);
> } \
> EXPORT_SYMBOL(__tsan_read##size); \
> void __tsan_unaligned_read##size(void *ptr) \
> - __alias(__tsan_read##size); \
> + __alias("__tsan_read" #size); \
> EXPORT_SYMBOL(__tsan_unaligned_read##size); \
> void __tsan_write##size(void *ptr); \
> void __tsan_write##size(void *ptr) \
> @@ -823,7 +823,7 @@ EXPORT_SYMBOL(__kcsan_check_access);
> } \
> EXPORT_SYMBOL(__tsan_write##size); \
> void __tsan_unaligned_write##size(void *ptr) \
> - __alias(__tsan_write##size); \
> + __alias("__tsan_write" #size); \
> EXPORT_SYMBOL(__tsan_unaligned_write##size); \
> void __tsan_read_write##size(void *ptr); \
> void __tsan_read_write##size(void *ptr) \
> @@ -833,7 +833,7 @@ EXPORT_SYMBOL(__kcsan_check_access);
> } \
> EXPORT_SYMBOL(__tsan_read_write##size); \
> void __tsan_unaligned_read_write##size(void *ptr) \
> - __alias(__tsan_read_write##size); \
> + __alias("__tsan_read_write" #size); \
> EXPORT_SYMBOL(__tsan_unaligned_read_write##size)
>
> DEFINE_TSAN_READ_WRITE(1);
> @@ -877,7 +877,7 @@ EXPORT_SYMBOL(__tsan_write_range);
> } \
> EXPORT_SYMBOL(__tsan_volatile_read##size); \
> void __tsan_unaligned_volatile_read##size(void *ptr) \
> - __alias(__tsan_volatile_read##size); \
> + __alias("__tsan_volatile_read" #size); \
> EXPORT_SYMBOL(__tsan_unaligned_volatile_read##size); \
> void __tsan_volatile_write##size(void *ptr); \
> void __tsan_volatile_write##size(void *ptr) \
> @@ -892,7 +892,7 @@ EXPORT_SYMBOL(__tsan_write_range);
> } \
> EXPORT_SYMBOL(__tsan_volatile_write##size); \
> void __tsan_unaligned_volatile_write##size(void *ptr) \
> - __alias(__tsan_volatile_write##size); \
> + __alias("__tsan_volatile_write" #size); \
> EXPORT_SYMBOL(__tsan_unaligned_volatile_write##size)
>
> DEFINE_TSAN_VOLATILE_READ_WRITE(1);
> diff --git a/lib/crc32.c b/lib/crc32.c
> index 2a68dfd3b96c..373a17aaa432 100644
> --- a/lib/crc32.c
> +++ b/lib/crc32.c
> @@ -206,8 +206,8 @@ u32 __pure __weak __crc32c_le(u32 crc, unsigned char const *p, size_t len)
> EXPORT_SYMBOL(crc32_le);
> EXPORT_SYMBOL(__crc32c_le);
>
> -u32 __pure crc32_le_base(u32, unsigned char const *, size_t) __alias(crc32_le);
> -u32 __pure __crc32c_le_base(u32, unsigned char const *, size_t) __alias(__crc32c_le);
> +u32 __pure crc32_le_base(u32, unsigned char const *, size_t) __alias("crc32_le");
> +u32 __pure __crc32c_le_base(u32, unsigned char const *, size_t) __alias("__crc32c_le");
>
> /*
> * This multiplies the polynomials x and y modulo the given modulus.
> diff --git a/lib/crypto/aes.c b/lib/crypto/aes.c
> index 827fe89922ff..5b80514595c2 100644
> --- a/lib/crypto/aes.c
> +++ b/lib/crypto/aes.c
> @@ -82,8 +82,8 @@ static volatile const u8 __cacheline_aligned aes_inv_sbox[] = {
> 0xe1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0c, 0x7d,
> };
>
> -extern const u8 crypto_aes_sbox[256] __alias(aes_sbox);
> -extern const u8 crypto_aes_inv_sbox[256] __alias(aes_inv_sbox);
> +extern const u8 crypto_aes_sbox[256] __alias("aes_sbox");
> +extern const u8 crypto_aes_inv_sbox[256] __alias("aes_inv_sbox");
>
> EXPORT_SYMBOL(crypto_aes_sbox);
> EXPORT_SYMBOL(crypto_aes_inv_sbox);
> diff --git a/mm/kasan/generic.c b/mm/kasan/generic.c
> index 248264b9cb76..4496f897e4f5 100644
> --- a/mm/kasan/generic.c
> +++ b/mm/kasan/generic.c
> @@ -234,7 +234,7 @@ EXPORT_SYMBOL(__asan_unregister_globals);
> check_memory_region_inline(addr, size, false, _RET_IP_);\
> } \
> EXPORT_SYMBOL(__asan_load##size); \
> - __alias(__asan_load##size) \
> + __alias("__asan_load" #size) \
> void __asan_load##size##_noabort(unsigned long); \
> EXPORT_SYMBOL(__asan_load##size##_noabort); \
> void __asan_store##size(unsigned long addr) \
> @@ -242,7 +242,7 @@ EXPORT_SYMBOL(__asan_unregister_globals);
> check_memory_region_inline(addr, size, true, _RET_IP_); \
> } \
> EXPORT_SYMBOL(__asan_store##size); \
> - __alias(__asan_store##size) \
> + __alias("__asan_store" #size) \
> void __asan_store##size##_noabort(unsigned long); \
> EXPORT_SYMBOL(__asan_store##size##_noabort)
>
> @@ -258,7 +258,7 @@ void __asan_loadN(unsigned long addr, size_t size)
> }
> EXPORT_SYMBOL(__asan_loadN);
>
> -__alias(__asan_loadN)
> +__alias("__asan_loadN")
> void __asan_loadN_noabort(unsigned long, size_t);
> EXPORT_SYMBOL(__asan_loadN_noabort);
>
> @@ -268,7 +268,7 @@ void __asan_storeN(unsigned long addr, size_t size)
> }
> EXPORT_SYMBOL(__asan_storeN);
>
> -__alias(__asan_storeN)
> +__alias("__asan_storeN")
> void __asan_storeN_noabort(unsigned long, size_t);
> EXPORT_SYMBOL(__asan_storeN_noabort);
>
>
>
>
>
On Wed, 2020-10-21 at 21:02 +0200, Ard Biesheuvel wrote:
> On Wed, 21 Oct 2020 at 20:58, Joe Perches <[email protected]> wrote:
> > Like the __section macro, the __alias macro uses
> > macro # stringification to create quotes around
> > the section name used in the __attribute__.
> >
> > Remove the stringification and add quotes or a
> > stringification to the uses instead.
> >
>
> Why?
Using quotes in __section caused/causes differences
between clang and gcc.
https://lkml.org/lkml/2020/9/29/2187
Using common styles for details like this is good.
On Wed, 21 Oct 2020 at 20:58, Joe Perches <[email protected]> wrote:
>
> Like the __section macro, the __alias macro uses
> macro # stringification to create quotes around
> the section name used in the __attribute__.
>
> Remove the stringification and add quotes or a
> stringification to the uses instead.
>
> Signed-off-by: Joe Perches <[email protected]>
> ---
>
> There is a script that might eventually be applied
> to convert the __section macro definition and uses
> to remove stringification
>
> https://lore.kernel.org/lkml/[email protected]/
> https://lore.kernel.org/lkml/[email protected]/
>
> This patch is intended to create commonality
> between the uses of __section and __alias.
>
> arch/x86/boot/compressed/string.c | 6 +++---
> arch/x86/include/asm/syscall_wrapper.h | 2 +-
> drivers/firmware/efi/runtime-wrappers.c | 2 +-
> include/linux/compiler_attributes.h | 2 +-
> kernel/kcsan/core.c | 10 +++++-----
> lib/crc32.c | 4 ++--
> lib/crypto/aes.c | 4 ++--
> mm/kasan/generic.c | 8 ++++----
> 8 files changed, 19 insertions(+), 19 deletions(-)
Reviewed-by: Marco Elver <[email protected]>
for KCSAN and KASAN.
Thank you!
> diff --git a/arch/x86/boot/compressed/string.c b/arch/x86/boot/compressed/string.c
> index 81fc1eaa3229..d38b122f51ef 100644
> --- a/arch/x86/boot/compressed/string.c
> +++ b/arch/x86/boot/compressed/string.c
> @@ -75,7 +75,7 @@ void *memcpy(void *dest, const void *src, size_t n)
> }
>
> #ifdef CONFIG_KASAN
> -extern void *__memset(void *s, int c, size_t n) __alias(memset);
> -extern void *__memmove(void *dest, const void *src, size_t n) __alias(memmove);
> -extern void *__memcpy(void *dest, const void *src, size_t n) __alias(memcpy);
> +extern void *__memset(void *s, int c, size_t n) __alias("memset");
> +extern void *__memmove(void *dest, const void *src, size_t n) __alias("memmove");
> +extern void *__memcpy(void *dest, const void *src, size_t n) __alias("memcpy");
> #endif
> diff --git a/arch/x86/include/asm/syscall_wrapper.h b/arch/x86/include/asm/syscall_wrapper.h
> index a84333adeef2..f19d1bbbff3d 100644
> --- a/arch/x86/include/asm/syscall_wrapper.h
> +++ b/arch/x86/include/asm/syscall_wrapper.h
> @@ -69,7 +69,7 @@ extern long __ia32_sys_ni_syscall(const struct pt_regs *regs);
> long __##abi##_##name(const struct pt_regs *regs); \
> ALLOW_ERROR_INJECTION(__##abi##_##name, ERRNO); \
> long __##abi##_##name(const struct pt_regs *regs) \
> - __alias(__do_##name);
> + __alias("__do_" #name);
>
> #define __SYS_STUBx(abi, name, ...) \
> long __##abi##_##name(const struct pt_regs *regs); \
> diff --git a/drivers/firmware/efi/runtime-wrappers.c b/drivers/firmware/efi/runtime-wrappers.c
> index 1410beaef5c3..14e380ac65d4 100644
> --- a/drivers/firmware/efi/runtime-wrappers.c
> +++ b/drivers/firmware/efi/runtime-wrappers.c
> @@ -162,7 +162,7 @@ static DEFINE_SEMAPHORE(efi_runtime_lock);
> * Expose the EFI runtime lock to the UV platform
> */
> #ifdef CONFIG_X86_UV
> -extern struct semaphore __efi_uv_runtime_lock __alias(efi_runtime_lock);
> +extern struct semaphore __efi_uv_runtime_lock __alias("efi_runtime_lock");
> #endif
>
> /*
> diff --git a/include/linux/compiler_attributes.h b/include/linux/compiler_attributes.h
> index ea7b756b1c8f..4819512c9abd 100644
> --- a/include/linux/compiler_attributes.h
> +++ b/include/linux/compiler_attributes.h
> @@ -42,7 +42,7 @@
> /*
> * gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-alias-function-attribute
> */
> -#define __alias(symbol) __attribute__((__alias__(#symbol)))
> +#define __alias(symbol) __attribute__((__alias__(symbol)))
>
> /*
> * gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-aligned-function-attribute
> diff --git a/kernel/kcsan/core.c b/kernel/kcsan/core.c
> index 3994a217bde7..465f6cfc317c 100644
> --- a/kernel/kcsan/core.c
> +++ b/kernel/kcsan/core.c
> @@ -814,7 +814,7 @@ EXPORT_SYMBOL(__kcsan_check_access);
> } \
> EXPORT_SYMBOL(__tsan_read##size); \
> void __tsan_unaligned_read##size(void *ptr) \
> - __alias(__tsan_read##size); \
> + __alias("__tsan_read" #size); \
> EXPORT_SYMBOL(__tsan_unaligned_read##size); \
> void __tsan_write##size(void *ptr); \
> void __tsan_write##size(void *ptr) \
> @@ -823,7 +823,7 @@ EXPORT_SYMBOL(__kcsan_check_access);
> } \
> EXPORT_SYMBOL(__tsan_write##size); \
> void __tsan_unaligned_write##size(void *ptr) \
> - __alias(__tsan_write##size); \
> + __alias("__tsan_write" #size); \
> EXPORT_SYMBOL(__tsan_unaligned_write##size); \
> void __tsan_read_write##size(void *ptr); \
> void __tsan_read_write##size(void *ptr) \
> @@ -833,7 +833,7 @@ EXPORT_SYMBOL(__kcsan_check_access);
> } \
> EXPORT_SYMBOL(__tsan_read_write##size); \
> void __tsan_unaligned_read_write##size(void *ptr) \
> - __alias(__tsan_read_write##size); \
> + __alias("__tsan_read_write" #size); \
> EXPORT_SYMBOL(__tsan_unaligned_read_write##size)
>
> DEFINE_TSAN_READ_WRITE(1);
> @@ -877,7 +877,7 @@ EXPORT_SYMBOL(__tsan_write_range);
> } \
> EXPORT_SYMBOL(__tsan_volatile_read##size); \
> void __tsan_unaligned_volatile_read##size(void *ptr) \
> - __alias(__tsan_volatile_read##size); \
> + __alias("__tsan_volatile_read" #size); \
> EXPORT_SYMBOL(__tsan_unaligned_volatile_read##size); \
> void __tsan_volatile_write##size(void *ptr); \
> void __tsan_volatile_write##size(void *ptr) \
> @@ -892,7 +892,7 @@ EXPORT_SYMBOL(__tsan_write_range);
> } \
> EXPORT_SYMBOL(__tsan_volatile_write##size); \
> void __tsan_unaligned_volatile_write##size(void *ptr) \
> - __alias(__tsan_volatile_write##size); \
> + __alias("__tsan_volatile_write" #size); \
> EXPORT_SYMBOL(__tsan_unaligned_volatile_write##size)
>
> DEFINE_TSAN_VOLATILE_READ_WRITE(1);
> diff --git a/lib/crc32.c b/lib/crc32.c
> index 2a68dfd3b96c..373a17aaa432 100644
> --- a/lib/crc32.c
> +++ b/lib/crc32.c
> @@ -206,8 +206,8 @@ u32 __pure __weak __crc32c_le(u32 crc, unsigned char const *p, size_t len)
> EXPORT_SYMBOL(crc32_le);
> EXPORT_SYMBOL(__crc32c_le);
>
> -u32 __pure crc32_le_base(u32, unsigned char const *, size_t) __alias(crc32_le);
> -u32 __pure __crc32c_le_base(u32, unsigned char const *, size_t) __alias(__crc32c_le);
> +u32 __pure crc32_le_base(u32, unsigned char const *, size_t) __alias("crc32_le");
> +u32 __pure __crc32c_le_base(u32, unsigned char const *, size_t) __alias("__crc32c_le");
>
> /*
> * This multiplies the polynomials x and y modulo the given modulus.
> diff --git a/lib/crypto/aes.c b/lib/crypto/aes.c
> index 827fe89922ff..5b80514595c2 100644
> --- a/lib/crypto/aes.c
> +++ b/lib/crypto/aes.c
> @@ -82,8 +82,8 @@ static volatile const u8 __cacheline_aligned aes_inv_sbox[] = {
> 0xe1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0c, 0x7d,
> };
>
> -extern const u8 crypto_aes_sbox[256] __alias(aes_sbox);
> -extern const u8 crypto_aes_inv_sbox[256] __alias(aes_inv_sbox);
> +extern const u8 crypto_aes_sbox[256] __alias("aes_sbox");
> +extern const u8 crypto_aes_inv_sbox[256] __alias("aes_inv_sbox");
>
> EXPORT_SYMBOL(crypto_aes_sbox);
> EXPORT_SYMBOL(crypto_aes_inv_sbox);
> diff --git a/mm/kasan/generic.c b/mm/kasan/generic.c
> index 248264b9cb76..4496f897e4f5 100644
> --- a/mm/kasan/generic.c
> +++ b/mm/kasan/generic.c
> @@ -234,7 +234,7 @@ EXPORT_SYMBOL(__asan_unregister_globals);
> check_memory_region_inline(addr, size, false, _RET_IP_);\
> } \
> EXPORT_SYMBOL(__asan_load##size); \
> - __alias(__asan_load##size) \
> + __alias("__asan_load" #size) \
> void __asan_load##size##_noabort(unsigned long); \
> EXPORT_SYMBOL(__asan_load##size##_noabort); \
> void __asan_store##size(unsigned long addr) \
> @@ -242,7 +242,7 @@ EXPORT_SYMBOL(__asan_unregister_globals);
> check_memory_region_inline(addr, size, true, _RET_IP_); \
> } \
> EXPORT_SYMBOL(__asan_store##size); \
> - __alias(__asan_store##size) \
> + __alias("__asan_store" #size) \
> void __asan_store##size##_noabort(unsigned long); \
> EXPORT_SYMBOL(__asan_store##size##_noabort)
>
> @@ -258,7 +258,7 @@ void __asan_loadN(unsigned long addr, size_t size)
> }
> EXPORT_SYMBOL(__asan_loadN);
>
> -__alias(__asan_loadN)
> +__alias("__asan_loadN")
> void __asan_loadN_noabort(unsigned long, size_t);
> EXPORT_SYMBOL(__asan_loadN_noabort);
>
> @@ -268,7 +268,7 @@ void __asan_storeN(unsigned long addr, size_t size)
> }
> EXPORT_SYMBOL(__asan_storeN);
>
> -__alias(__asan_storeN)
> +__alias("__asan_storeN")
> void __asan_storeN_noabort(unsigned long, size_t);
> EXPORT_SYMBOL(__asan_storeN_noabort);
>
>
>
>
>
On Wed, Oct 21, 2020 at 9:07 PM Joe Perches <[email protected]> wrote:
>
> Using quotes in __section caused/causes differences
> between clang and gcc.
Yeah, it is a good cleanup get.
Thanks!
> https://lkml.org/lkml/2020/9/29/2187
Can you please put this in a Link: like Ard suggested? (and ideally
find the message in lore.kernel.org instead).
Cheers,
Miguel
On Wed, Oct 21, 2020 at 12:07 PM Joe Perches <[email protected]> wrote:
>
> On Wed, 2020-10-21 at 21:02 +0200, Ard Biesheuvel wrote:
> > On Wed, 21 Oct 2020 at 20:58, Joe Perches <[email protected]> wrote:
> > > Like the __section macro, the __alias macro uses
> > > macro # stringification to create quotes around
> > > the section name used in the __attribute__.
> > >
> > > Remove the stringification and add quotes or a
> > > stringification to the uses instead.
> > >
> >
> > Why?
>
> Using quotes in __section caused/causes differences
> between clang and gcc.
>
> https://lkml.org/lkml/2020/9/29/2187
>
> Using common styles for details like this is good.
Luckily, there's no difference/issue here with alias as there exist
with section: https://godbolt.org/z/eWxc7P
So it's just a stylistic cleanup, not a bugfix.
Acked-by: Nick Desaulniers <[email protected]>
$ grep -rn __attribute__ | grep alias
didn't turn up any other cases that look like they don't use strings.
--
Thanks,
~Nick Desaulniers
From: Ard Biesheuvel
> Sent: 21 October 2020 20:03
>
> On Wed, 21 Oct 2020 at 20:58, Joe Perches <[email protected]> wrote:
> >
> > Like the __section macro, the __alias macro uses
> > macro # stringification to create quotes around
> > the section name used in the __attribute__.
> >
> > Remove the stringification and add quotes or a
> > stringification to the uses instead.
> >
>
> Why?
It allows the section name be made up of two concatenated strings.
David
-
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)
On Thu, 2020-10-22 at 09:33 +0200, Peter Zijlstra wrote:
> On Wed, Oct 21, 2020 at 11:58:25AM -0700, Joe Perches wrote:
> > Like the __section macro, the __alias macro uses
> > macro # stringification to create quotes around
> > the section name used in the __attribute__.
> >
> > Remove the stringification and add quotes or a
> > stringification to the uses instead.
>
> There's a complete lack of rationale for this change.
I'll eventually post V2.
I'm waiting to see if there are more comments.
As I wrote in reply to Ard:
https://lore.kernel.org/lkml/[email protected]/
Using quotes in __section caused/causes differences
between clang and gcc.
https://lkml.org/lkml/2020/9/29/2187
Using common styles for details like this is good.
(+ Russell)
On Thu, 22 Oct 2020 at 18:20, Joe Perches <[email protected]> wrote:
>
> On Thu, 2020-10-22 at 09:33 +0200, Peter Zijlstra wrote:
> > On Wed, Oct 21, 2020 at 11:58:25AM -0700, Joe Perches wrote:
> > > Like the __section macro, the __alias macro uses
> > > macro # stringification to create quotes around
> > > the section name used in the __attribute__.
> > >
> > > Remove the stringification and add quotes or a
> > > stringification to the uses instead.
> >
> > There's a complete lack of rationale for this change.
>
> I'll eventually post V2.
> I'm waiting to see if there are more comments.
>
> As I wrote in reply to Ard:
>
> https://lore.kernel.org/lkml/[email protected]/
>
> Using quotes in __section caused/causes differences
> between clang and gcc.
>
> https://lkml.org/lkml/2020/9/29/2187
>
> Using common styles for details like this is good.
>
This patch is now causing problems in the ARM tree, because some new
uses of __alias() have been queued (for KASAN), and since this is a
non-backwards compatible change, we have to choose between breaking
the maintainer's tree or breaking -next (given that the change has
been pulled in there now)
I am still not convinced we need this change, as I don't see how the
concerns regarding __section apply to __alias. But if we do, can we
please use the same approach, i.e., revert the current patch, and
queue it again after v5.11-rc1 with all new occurrences covered as
well?
On Wed, Nov 11, 2020 at 8:19 AM Ard Biesheuvel <[email protected]> wrote:
>
> I am still not convinced we need this change, as I don't see how the
> concerns regarding __section apply to __alias. But if we do, can we
> please use the same approach, i.e., revert the current patch, and
> queue it again after v5.11-rc1 with all new occurrences covered as
> well?
In general, it would be nice to move all compiler attributes to use
the `__` syntax, which is independent of compiler vendor, gives us a
level of indirection to modify behavior between compilers and is
shorter/nicer for users.
But it is low priority, so it should go in whenever it causes the
least amount of trouble.
Cheers,
Miguel