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s390/uaccess: Define INLINE_COPY_FROM_USER and INLINE_COPY_TO_USER

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Inline copy_from_user() and copy_to_user(). With the shortened inline
assemblies of raw_copy_to_user() and raw_copy_from_user() the additional
kernel text size is acceptable, considering that this avoids function
calls on hot paths.

This increases the kernel text size by ~90kb (defconfig, gcc 14.2.0):

add/remove: 13/4 grow/shrink: 650/14 up/down: 93484/-3254 (90230)

Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Heiko Carstens 2025-02-11 20:19:28 +01:00 committed by Vasily Gorbik
parent bc6029239c
commit 10a79b6fdd
1 changed files with 3 additions and 0 deletions
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3
arch/s390/include/asm/uaccess.h
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@ -28,6 +28,9 @@ void debug_user_asce(int exit);
#define uaccess_kmsan_or_inline __always_inline
#endif
#define INLINE_COPY_FROM_USER
#define INLINE_COPY_TO_USER
static uaccess_kmsan_or_inline __must_check unsigned long
raw_copy_from_user(void *to, const void __user *from, unsigned long size)
{