xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

mm: add ksys_fadvise64_64() helper; remove in-kernel call to sys_fadvise64_64()

Browse Source 
Using the ksys_fadvise64_64() helper allows us to avoid the in-kernel
calls to the sys_fadvise64_64() 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 ksys_fadvise64_64().

Some compat stubs called sys_fadvise64(), which then just passed through
the arguments to sys_fadvise64_64(). Get rid of this indirection, and call
ksys_fadvise64_64() directly.

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: Dominik Brodowski <linux@dominikbrodowski.net>
This commit is contained in:
Dominik Brodowski
2018-03-11 11:34:45 +01:00
parent edf292c76b
commit 9d5b7c956b
12 changed files with 43 additions and 27 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
arch/sparc/kernel/sys_sparc32.c
View File

@@ -225,7 +225,7 @@ long compat_sys_fadvise64(int fd,
unsigned long offlo,
compat_size_t len, int advice)
{
return sys_fadvise64_64(fd, (offhi << 32) | offlo, len, advice);
return ksys_fadvise64_64(fd, (offhi << 32) | offlo, len, advice);
}
long compat_sys_fadvise64_64(int fd,
@@ -233,10 +233,10 @@ long compat_sys_fadvise64_64(int fd,
unsigned long lenhi, unsigned long lenlo,
int advice)
{
return sys_fadvise64_64(fd,
(offhi << 32) | offlo,
(lenhi << 32) | lenlo,
advice);
return ksys_fadvise64_64(fd,
(offhi << 32) | offlo,
(lenhi << 32) | lenlo,
advice);
}
long sys32_sync_file_range(unsigned int fd, unsigned long off_high, unsigned long off_low, unsigned long nb_high, unsigned long nb_low, unsigned int flags)