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authorDominik Brodowski <linux@dominikbrodowski.net>2018-03-19 19:51:36 +0300
committerDominik Brodowski <linux@dominikbrodowski.net>2018-04-02 21:16:12 +0300
commitc7b95d5156a9ee70f800bd2e47a9eba677be73e1 (patch)
treea6f4b1d0d4bc5f9be4665034f8cadcce6ac472c5 /mm
parenta90f590a1bee36fc2129cfb38ceec24a555bb12d (diff)
downloadlinux-c7b95d5156a9ee70f800bd2e47a9eba677be73e1.tar.xz
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: Dominik Brodowski <linux@dominikbrodowski.net>
Diffstat (limited to 'mm')
-rw-r--r--mm/readahead.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/mm/readahead.c b/mm/readahead.c
index c4ca70239233..4d57b4644f98 100644
--- a/mm/readahead.c
+++ b/mm/readahead.c
@@ -573,7 +573,7 @@ do_readahead(struct address_space *mapping, struct file *filp,
return force_page_cache_readahead(mapping, filp, index, nr);
}
-SYSCALL_DEFINE3(readahead, int, fd, loff_t, offset, size_t, count)
+ssize_t ksys_readahead(int fd, loff_t offset, size_t count)
{
ssize_t ret;
struct fd f;
@@ -592,3 +592,8 @@ SYSCALL_DEFINE3(readahead, int, fd, loff_t, offset, size_t, count)
}
return ret;
}
+
+SYSCALL_DEFINE3(readahead, int, fd, loff_t, offset, size_t, count)
+{
+ return ksys_readahead(fd, offset, count);
+}