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mm: add ksys_mmap_pgoff() helper; remove in-kernel calls to sys_mmap_pgoff()

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Using this helper allows us to avoid the in-kernel calls to the
sys_mmap_pgoff() 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_mmap_pgoff().

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 11:34:46 +01:00
parent 9d5b7c956b
commit a90f590a1b
21 changed files with 60 additions and 41 deletions
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4
arch/ia64/kernel/sys_ia64.c
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@@ -139,7 +139,7 @@ int ia64_mmap_check(unsigned long addr, unsigned long len,
asmlinkage unsigned long
sys_mmap2 (unsigned long addr, unsigned long len, int prot, int flags, int fd, long pgoff)
{
addr = sys_mmap_pgoff(addr, len, prot, flags, fd, pgoff);
addr = ksys_mmap_pgoff(addr, len, prot, flags, fd, pgoff);
if (!IS_ERR((void *) addr))
force_successful_syscall_return();
return addr;
@@ -151,7 +151,7 @@ sys_mmap (unsigned long addr, unsigned long len, int prot, int flags, int fd, lo
if (offset_in_page(off) != 0)
return -EINVAL;
addr = sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
addr = ksys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
if (!IS_ERR((void *) addr))
force_successful_syscall_return();
return addr;