Commit c7b95d51 authored by Dominik Brodowski's avatar Dominik Brodowski
Browse files

mm: add ksys_readahead() helper; remove in-kernel calls to sys_readahead() 

Using this helper allows us to avoid the in-kernel calls to the
sys_readahead() syscall. The ksys_ prefix denotes that this function is
meant as a drop-in replacement for the syscall. In particular, it uses the
same calling convention as sys_readahead().

This patch is part of a series which removes in-kernel calls to syscalls.
On this basis, the syscall entry path can be streamlined. For details, see
http://lkml.kernel.org/r/20180325162527.GA17492@light.dominikbrodowski.net



Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-mm@kvack.org
Signed-off-by: default avatarDominik Brodowski <linux@dominikbrodowski.net>
parent a90f590a

arch/mips/kernel/linux32.c

+1 −1
Original line number Diff line number Diff line
@@ -131,7 +131,7 @@ SYSCALL_DEFINE1(32_personality, unsigned long, personality) 
asmlinkage ssize_t sys32_readahead(int fd, u32 pad0, u64 a2, u64 a3,

				   size_t count)

{

	return sys_readahead(fd, merge_64(a2, a3), count);

	return ksys_readahead(fd, merge_64(a2, a3), count);

}



asmlinkage long sys32_sync_file_range(int fd, int __pad,

arch/parisc/kernel/sys_parisc.c

+1 −1
Original line number Diff line number Diff line
@@ -345,7 +345,7 @@ asmlinkage ssize_t parisc_pwrite64(unsigned int fd, const char __user *buf, 
asmlinkage ssize_t parisc_readahead(int fd, unsigned int high, unsigned int low,

		                    size_t count)

{

	return sys_readahead(fd, (loff_t)high << 32 | low, count);

	return ksys_readahead(fd, (loff_t)high << 32 | low, count);

}



asmlinkage long parisc_fadvise64_64(int fd,

arch/powerpc/kernel/sys_ppc32.c

+1 −1
Original line number Diff line number Diff line
@@ -88,7 +88,7 @@ compat_ssize_t compat_sys_pwrite64(unsigned int fd, const char __user *ubuf, com 


compat_ssize_t compat_sys_readahead(int fd, u32 r4, u32 offhi, u32 offlo, u32 count)

{

	return sys_readahead(fd, ((loff_t)offhi << 32) | offlo, count);

	return ksys_readahead(fd, ((loff_t)offhi << 32) | offlo, count);

}



asmlinkage int compat_sys_truncate64(const char __user * path, u32 reg4,

arch/s390/kernel/compat_linux.c

+1 −1
Original line number Diff line number Diff line
@@ -328,7 +328,7 @@ COMPAT_SYSCALL_DEFINE5(s390_pwrite64, unsigned int, fd, const char __user *, ubu 


COMPAT_SYSCALL_DEFINE4(s390_readahead, int, fd, u32, high, u32, low, s32, count)

{

	return sys_readahead(fd, (unsigned long)high << 32 | low, count);

	return ksys_readahead(fd, (unsigned long)high << 32 | low, count);

}



struct stat64_emu31 {

arch/sparc/kernel/sys_sparc32.c

+1 −1
Original line number Diff line number Diff line
@@ -217,7 +217,7 @@ asmlinkage long compat_sys_readahead(int fd, 
				     unsigned long offlo,

				     compat_size_t count)

{

	return sys_readahead(fd, (offhi << 32) | offlo, count);

	return ksys_readahead(fd, (offhi << 32) | offlo, count);

}



long compat_sys_fadvise64(int fd,

CRA Git | Maintained and supported by SUSTech CRA and CCSE